fix ci: turn on import std tests, fix libc++ build (#96)

This PR:
- enables tests with `import std` usage in CI
- add all tests to build with cmake_subdir_test (because there was only a subset of tests supported)
- fixes tests build with `libc++`
- disables some tests with wchar_t with 'libc++'

.github/dependabot.yml

@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+        interval: "weekly"

.github/workflows/ci.yml

@@ -0,0 +1,260 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - develop
+      - feature/**
+
+env:
+  UBSAN_OPTIONS: print_stacktrace=1
+
+jobs:
+  posix:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: gcc-14  # Do not remove! It is the only toolset that tests CMake tests down below
+            cxxstd: "03,11,14,17,20"
+            os: ubuntu-24.04
+            compiler: g++-14
+          - toolset: gcc-12
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-22.04
+            cxxflags: "cxxflags=--coverage -fsanitize=address,leak,undefined -fno-sanitize-recover=undefined"
+            linkflags: "linkflags=--coverage -lasan -lubsan"
+            gcov_tool: "gcov-12"
+            launcher: "testing.launcher=LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libasan.so.8"
+          - toolset: gcc-11
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-22.04
+          - toolset: clang
+            compiler: clang++-14
+            cxxstd: "03,11,14,17,2a"
+            os: ubuntu-22.04
+          - toolset: clang
+            cxxstd: "11,14,17,20"
+            os: macos-latest
+          - toolset: clang-19
+            cxxstd: "20,23"
+            os: ubuntu-24.04
+            compiler: clang++-19
+            install: clang-19 llvm-19 libclang-rt-19-dev libc++-19-dev libc++abi-19-dev clang-tools-19
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Install packages
+        if: matrix.install
+        run: sudo apt install ${{matrix.install}}
+
+      - name: Setup Boost
+        run: |
+          echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
+          LIBRARY=${GITHUB_REPOSITORY#*/}
+          echo LIBRARY: $LIBRARY
+          echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
+          echo GITHUB_BASE_REF: $GITHUB_BASE_REF
+          echo GITHUB_REF: $GITHUB_REF
+          REF=${GITHUB_BASE_REF:-$GITHUB_REF}
+          REF=${REF#refs/heads/}
+          echo REF: $REF
+          BOOST_BRANCH=develop && [ "$REF" == "master" ] && BOOST_BRANCH=master || true
+          echo BOOST_BRANCH: $BOOST_BRANCH
+          cd ..
+          git clone -b $BOOST_BRANCH --depth 10 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          git submodule update --init --depth 10 --jobs 2 tools/boostdep tools/inspect libs/filesystem
+          python tools/boostdep/depinst/depinst.py --git_args "--depth 10 --jobs 3" filesystem
+          rm -rf libs/$LIBRARY/*
+          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          python tools/boostdep/depinst/depinst.py --include benchmark --include example --include examples --include tools --git_args "--depth 10 --jobs 3" $LIBRARY
+          ./bootstrap.sh
+          ./b2 -j4 variant=debug tools/inspect
+
+      - name: Run modules tests without 'import std;'
+        if: ${{matrix.toolset == 'clang-19'}}
+        run: |
+          cd ../boost-root/libs/lexical_cast
+          cmake -S test/cmake_subdir_test -B build_module \
+            -GNinja \
+            -DBUILD_TESTING=1 \
+            -DBOOST_USE_MODULES=1 \
+            -DCMAKE_CXX_COMPILER=clang++-19 \
+            -DCMAKE_C_COMPILER=clang-19
+          cmake --build build_module
+          ctest --test-dir build_module -V --no-tests=error
+          rm -rf build_module
+
+      - name: Run modules tests
+        if: ${{matrix.toolset == 'clang-19'}}
+        run: |
+          cd ../boost-root/libs/lexical_cast
+          cmake -S test/cmake_subdir_test -B build_module \
+            -GNinja \
+            -DBUILD_TESTING=1 \
+            -DBOOST_USE_MODULES=1 \
+            -DCMAKE_CXX_COMPILER=clang++-19 \
+            -DCMAKE_C_COMPILER=clang-19 \
+            -DCMAKE_CXX_FLAGS=-stdlib=libc++ \
+            -DCMAKE_CXX_STANDARD=23 \
+            -DCMAKE_EXPERIMENTAL_CXX_IMPORT_STD=0e5b6991-d74f-4b3d-a41c-cf096e0b2508 \
+            -DCMAKE_CXX_MODULE_STD=ON
+          cmake --build build_module
+          ctest --test-dir build_module -V --no-tests=error
+          rm -rf build_module
+
+      - name: Run CMake tests
+        if: ${{matrix.toolset == 'gcc-14' || matrix.toolset == 'clang-19'}}
+        run: |
+          cd ../boost-root/
+          cmake -S . -B __build \
+            -DBUILD_TESTING=1 \
+            -DBOOST_INCLUDE_LIBRARIES=lexical_cast \
+            -DCMAKE_CXX_COMPILER=${{matrix.compiler}} \
+            -DCMAKE_C_COMPILER=${{matrix.toolset}}
+          cmake --build __build --target tests
+          ctest --test-dir __build --output-on-failure --no-tests=error
+          rm -rf __build
+
+      - name: Run tests
+        run: |
+          cd ../boost-root
+          ./b2 -j3 libs/$LIBRARY/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} variant=debug,release "${{matrix.cxxflags}}" "${{matrix.linkflags}}" "${{matrix.launcher}}"
+          dist/bin/inspect libs/$LIBRARY
+
+      - name: Prepare coverage data
+        if: matrix.gcov_tool
+        run: |
+          mkdir -p $GITHUB_WORKSPACE/coveralls
+
+          echo -e "#!/bin/bash\nexec ${{matrix.gcov_tool}} \"\$@\"" > $GITHUB_WORKSPACE/coveralls/gcov_wrapper.sh
+          chmod +x $GITHUB_WORKSPACE/coveralls/gcov_wrapper.sh
+          wget https://github.com/linux-test-project/lcov/archive/v1.16.zip
+          unzip v1.16.zip
+          LCOV="`pwd`/lcov-1.16/bin/lcov --gcov-tool $GITHUB_WORKSPACE/coveralls/gcov_wrapper.sh"
+
+          echo "$LCOV --directory ../boost-root/bin.v2/libs/$LIBRARY/ --base-directory `pwd`/libs/$LIBRARY/test --capture --output-file $GITHUB_WORKSPACE/coveralls/coverage.info"
+          $LCOV --directory ../boost-root/bin.v2/libs/$LIBRARY/ --base-directory ../boost-root/ --capture --output-file $GITHUB_WORKSPACE/coveralls/coverage.info
+          $LCOV --remove $GITHUB_WORKSPACE/coveralls/coverage.info "/usr*" "*/$LIBRARY/test/*" ${{matrix.ignore_coverage}} "*/$LIBRARY/tests/*" "*/$LIBRARY/examples/*" "*/$LIBRARY/example/*" -o $GITHUB_WORKSPACE/coveralls/coverage.info
+
+          cd ../boost-root
+          OTHER_LIBS=`grep "submodule .*" .gitmodules | sed 's/\[submodule\ "\(.*\)"\]/"\*\/boost\/\1\.hpp" "\*\/boost\/\1\/\*"/g'| sed "/\"\*\/boost\/$LIBRARY\/\*\"/d" | sed ':a;N;$!ba;s/\n/ /g'`
+          echo $OTHER_LIBS
+          eval "$LCOV --remove $GITHUB_WORKSPACE/coveralls/coverage.info $OTHER_LIBS -o $GITHUB_WORKSPACE/coveralls/coverage.info"
+
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        if: matrix.gcov_tool
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: ./coveralls/coverage.info
+          parallel: true
+
+  windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: msvc-14.3
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: msvc
+            cxxstd: "14,17,latest"
+            addrmd: 64
+            os: windows-2025
+          - toolset: gcc
+            cxxstd: "03,11,14,17,2a"
+            addrmd: 64
+            os: windows-2022
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup Boost
+        shell: cmd
+        run: |
+          echo GITHUB_REPOSITORY: %GITHUB_REPOSITORY%
+          for /f %%i in ("%GITHUB_REPOSITORY%") do set LIBRARY=%%~nxi
+          echo LIBRARY: %LIBRARY%
+          echo LIBRARY=%LIBRARY%>>%GITHUB_ENV%
+          echo GITHUB_BASE_REF: %GITHUB_BASE_REF%
+          echo GITHUB_REF: %GITHUB_REF%
+          if "%GITHUB_BASE_REF%" == "" set GITHUB_BASE_REF=%GITHUB_REF%
+          set BOOST_BRANCH=develop
+          for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
+          echo BOOST_BRANCH: %BOOST_BRANCH%
+          cd ..
+          git clone -b %BOOST_BRANCH% --depth 10 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+          git submodule update --init tools/boostdep libs/test
+          python tools/boostdep/depinst/depinst.py --include benchmark --include example --include examples --include tools --git_args "--jobs 3" %LIBRARY%
+          cmd /c bootstrap
+
+      - name: Run CMake tests
+        if: ${{matrix.toolset == 'msvc-14.3'}}
+        shell: cmd
+        run: |
+          choco install --no-progress ninja
+          call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvarsall.bat" x64
+          cd ../boost-root/
+          mkdir __build
+          cd __build
+          cmake -DBUILD_TESTING=1 -DBOOST_INCLUDE_LIBRARIES=lexical_cast -G Ninja ..
+          cmake --build . --target tests --config Debug
+          ctest --output-on-failure --no-tests=error -C Debug
+
+      - name: Run modules tests
+        if: false
+        #if: ${{matrix.toolset == 'msvc-14.3'}}
+        shell: cmd
+        run: |
+          choco install --no-progress ninja
+          call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvarsall.bat" x64
+          cd ../boost-root/libs/lexical_cast
+          rm -rf build_module
+          mkdir build_module
+          cd build_module
+          cmake -DBOOST_USE_MODULES=1 -DCMAKE_CXX_STANDARD=23 -DCMAKE_EXPERIMENTAL_CXX_IMPORT_STD=0e5b6991-d74f-4b3d-a41c-cf096e0b2508 -G Ninja ../test/cmake_subdir_test/
+          cmake --build .
+          ctest --no-tests=error -V
+
+      - name: Run modules tests without 'import std;'
+        if: ${{matrix.toolset == 'msvc-14.3'}}
+        shell: cmd
+        run: |
+          choco install --no-progress ninja
+          call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvarsall.bat" x64
+          cd ../boost-root/libs/lexical_cast
+          rm -rf build_module
+          mkdir build_module
+          cd build_module
+          cmake -DBOOST_USE_MODULES=1 -DCMAKE_CXX_STANDARD=20 -G Ninja ../test/cmake_subdir_test/
+          cmake --build .
+          ctest --no-tests=error -V
+
+      - name: Run tests
+        shell: cmd
+        run: |
+          cd ../boost-root
+          b2 -j3 libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release
+
+  finish:
+    if: false
+    needs: posix
+    runs-on: ubuntu-latest
+    steps:
+    - name: Coveralls Finished
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.github_token }}
+        parallel-finished: true

CMakeLists.txt

@@ -0,0 +1,46 @@
+# Generated by `boostdep --cmake lexical_cast`
+# Copyright 2020 Peter Dimov
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+cmake_minimum_required(VERSION 3.5...4.0)
+
+project(boost_lexical_cast VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
+
+
+if (BOOST_USE_MODULES)
+    add_library(boost_lexical_cast)
+    target_sources(boost_lexical_cast PUBLIC
+        FILE_SET modules_public TYPE CXX_MODULES FILES
+            ${CMAKE_CURRENT_LIST_DIR}/modules/boost_lexical_cast.cppm
+    )
+
+    target_compile_features(boost_lexical_cast PUBLIC cxx_std_20)
+    target_compile_definitions(boost_lexical_cast PUBLIC BOOST_USE_MODULES)
+    if (CMAKE_CXX_COMPILER_IMPORT_STD)
+        target_compile_definitions(boost_lexical_cast PRIVATE BOOST_LEXICAL_CAST_USE_STD_MODULE)
+        message(STATUS "Using `import std;`")
+    else()
+        message(STATUS "`import std;` is not available")
+    endif()
+    set(__scope PUBLIC)
+else()
+    add_library(boost_lexical_cast INTERFACE)
+    set(__scope INTERFACE)
+endif()
+
+target_include_directories(boost_lexical_cast ${__scope} include)
+target_link_libraries(boost_lexical_cast
+  ${__scope}
+    Boost::config
+    Boost::container
+    Boost::core
+    Boost::throw_exception
+)
+
+add_library(Boost::lexical_cast ALIAS boost_lexical_cast)
+
+if(BUILD_TESTING)
+  add_subdirectory(test)
+endif()
+

README.md

@@ -0,0 +1,15 @@
+# [Boost.LexicalCast](https://boost.org/libs/lexical_cast)
+Boost.LexicalCast is one of the [Boost C++ Libraries](https://github.com/boostorg). This library is meant for general literal text conversions, such as an int represented a string, or vice-versa.
+
+### Test results
+
+@               | Build         | Tests coverage | More info
+----------------|-------------- | -------------- |-----------
+Develop branch: | [![CI](https://github.com/boostorg/lexical_cast/actions/workflows/ci.yml/badge.svg?branch=develop)](https://github.com/boostorg/lexical_cast/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/mwwanh1bpsnuv38h/branch/develop?svg=true)](https://ci.appveyor.com/project/apolukhin/lexical-cast/branch/develop)  | [![Coverage Status](https://coveralls.io/repos/boostorg/lexical_cast/badge.png?branch=develop)](https://coveralls.io/r/boostorg/lexical_cast?branch=develop) | [details...](https://www.boost.org/development/tests/develop/developer/lexical_cast.html)
+Master branch:  | [![CI](https://github.com/boostorg/lexical_cast/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/boostorg/lexical_cast/actions/workflows/ci.yml) [![Build status](https://ci.appveyor.com/api/projects/status/mwwanh1bpsnuv38h/branch/master?svg=true)](https://ci.appveyor.com/project/apolukhin/lexical-cast/branch/master)  | [![Coverage Status](https://coveralls.io/repos/boostorg/lexical_cast/badge.png?branch=master)](https://coveralls.io/r/boostorg/lexical_cast?branch=master) | [details...](https://www.boost.org/development/tests/master/developer/lexical_cast.html)
+
+[Latest developer documentation](https://www.boost.org/doc/libs/develop/doc/html/boost_lexical_cast.html)
+
+### License
+
+Distributed under the [Boost Software License, Version 1.0](https://boost.org/LICENSE_1_0.txt).

build.jam

@@ -0,0 +1,26 @@
+# Copyright René Ferdinand Rivera Morell 2023-2024
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+require-b2 5.2 ;
+
+constant boost_dependencies :
+    /boost/config//boost_config
+    /boost/container//boost_container
+    /boost/core//boost_core
+    /boost/throw_exception//boost_throw_exception ;
+
+project /boost/lexical_cast
+    : common-requirements
+        <include>include
+    ;
+
+explicit
+    [ alias boost_lexical_cast : : : : <library>$(boost_dependencies) ]
+    [ alias all : boost_lexical_cast test ]
+    ;
+
+call-if : boost-library lexical_cast
+    ;
+

cast.htm

@@ -1,140 +0,0 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-
-<html>
-  <head>
-    <meta name="generator" content=
-    "Microsoft FrontPage 5.0">
-    <meta http-equiv="Content-Type" content=
-    "text/html; charset=windows-1252">
-    <meta name="GENERATOR" content="Microsoft FrontPage 4.0">
-    <meta name="ProgId" content="FrontPage.Editor.Document">
-
-    <title>Header boost/cast.hpp Documentation</title>
-  </head>
-
-  <body bgcolor="#FFFFFF" text="#000000">
-    <h1><img src="../../boost.png" alt="boost.png (6897 bytes)" align=
-    "middle" width="277" height="86">Header <a href=
-    "../../boost/cast.hpp">boost/cast.hpp</a></h1>
-
-    <h2><a name="Cast Functions">Cast Functions</a></h2>
-
-    <p>The header <a href="../../boost/cast.hpp">boost/cast.hpp</a> provides <code>
-    <a href="#Polymorphic_cast">polymorphic_cast</a> and</code> <a href=
-    "#Polymorphic_cast"><code>polymorphic_downcast</code></a> function templates designed to
-    complement the C++ built-in casts.</p>
-
-    <p>The program <a href="cast_test.cpp">cast_test.cpp</a> can be used to
-    verify these function templates work as expected.</p>
-
-    <h3><a name="Polymorphic_cast">Polymorphic casts</a></h3>
-
-    <p>Pointers to polymorphic objects (objects of classes which define at
-    least one virtual function) are sometimes downcast or crosscast.
-    Downcasting means casting from a base class to a derived class.
-    Crosscasting means casting across an inheritance hierarchy diagram, such
-    as from one base to the other in a <code>Y</code> diagram hierarchy.</p>
-
-    <p>Such casts can be done with old-style casts, but this approach is
-    never to be recommended. Old-style casts are sorely lacking in type
-    safety, suffer poor readability, and are difficult to locate with search
-    tools.</p>
-
-    <p>The C++ built-in <code>static_cast</code> can be used for efficiently
-    downcasting pointers to polymorphic objects, but provides no error
-    detection for the case where the pointer being cast actually points to
-    the wrong derived class. The <code>polymorphic_downcast</code> template retains
-    the efficiency of <code>static_cast</code> for non-debug compilations, but for
-    debug compilations adds safety via an assert() that a <code>dynamic_cast</code>
-    succeeds.</p>
-
-    <p>The C++ built-in <code>dynamic_cast</code> can be used for downcasts and
-    crosscasts of pointers to polymorphic objects, but error notification in
-    the form of a returned value of 0 is inconvenient to test, or worse yet,
-    easy to forget to test. The throwing form of <code>dynamic_cast</code>, which
-    works on references, can be used on pointers through the ugly expression
-    &amp;<code>dynamic_cast&lt;T&amp;&gt;(*p)</code>, which causes undefined
-    behavior if <code>p</code> is <code>0</code>. The <code>polymorphic_cast</code>
-    template performs a <code>dynamic_cast</code> on a pointer, and throws an
-    exception if the <code>dynamic_cast</code> returns 0.</p>
-
-    <p>A <code>polymorphic_downcast</code> should be used for
-    downcasts that you are certain should succeed.  Error checking is
-    only performed in translation units where <code>NDEBUG</code> is
-    not defined, via
-<pre>  assert( dynamic_cast&lt;Derived&gt;(x) == x )
-</pre> where <code>x</code> is the source pointer.  This approach
-    ensures that not only is a non-zero pointer returned, but also
-    that it is correct in the presence of multiple inheritance.
-    Attempts to crosscast using <code>polymorphic_downcast</code> will
-    fail to compile.
-    <b>Warning:</b> Because <code>polymorphic_downcast</code> uses assert(), it
-    violates the One Definition Rule (ODR) if NDEBUG is inconsistently
-    defined across translation units. [See ISO Std 3.2]
-</p><p>
-    For crosscasts, or when the success of a cast can only be known at
-    runtime, or when efficiency is not important,
-    <code>polymorphic_cast</code> is preferred. </p>
-
-    <p>The C++ built-in <code>dynamic_cast</code> must be used to cast references
-    rather than pointers. It is also the only cast that can be used to check
-    whether a given interface is supported; in that case a return of 0 isn't
-    an error condition.</p>
-
-    <h3>polymorphic_cast and polymorphic_downcast synopsis</h3>
-
-    <blockquote>
-<pre>namespace boost {
-
-template &lt;class Derived, class Base&gt;
-inline Derived polymorphic_cast(Base* x);
-// Throws: std::bad_cast if ( dynamic_cast&lt;Derived&gt;(x) == 0 )
-// Returns: dynamic_cast&lt;Derived&gt;(x)
-
-template &lt;class Derived, class Base&gt;
-inline Derived polymorphic_downcast(Base* x);
-// Effects: assert( dynamic_cast&lt;Derived&gt;(x) == x );
-// Returns: static_cast&lt;Derived&gt;(x)
-
-}
-</pre>
-    </blockquote>
-
-    <h3>polymorphic_downcast example</h3>
-
-    <blockquote>
-<pre>#include &lt;boost/cast.hpp&gt;
-...
-class Fruit { public: virtual ~Fruit(){}; ... };
-class Banana : public Fruit { ... };
-...
-void f( Fruit * fruit ) {
-// ... logic which leads us to believe it is a Banana
-  Banana * banana = boost::polymorphic_downcast&lt;Banana*&gt;(fruit);
-  ...
-</pre>
-    </blockquote>
-
-    <h3>History</h3>
-
-    <p><code>polymorphic_cast</code> was suggested by Bjarne Stroustrup in "The C++
-    Programming Language".<br>
-     <code>polymorphic_downcast</code> was contributed by <a href=
-    "http://www.boost.org/people/dave_abrahams.htm">Dave Abrahams</a>.<code><br>
-     An old
-     numeric_cast</code> that was contributed by <a href=
-    "http://www.boost.org/people/kevlin_henney.htm">Kevlin Henney</a> is now superseeded by the <a href="../numeric/conversion/doc/index.html">Boost Numeric Conversion Library</a></p>
-    <hr>
-
-    <p>Revised
-    <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %B, %Y" startspan
-                    -->June 23, 2005<!--webbot bot="Timestamp" endspan i-checksum="30348"
-                    --></p>
-
-    <p>&copy; Copyright boost.org 1999. Permission to copy, use, modify, sell
-    and distribute this document is granted provided this copyright notice
-    appears in all copies. This document is provided "as is" without express
-    or implied warranty, and with no claim as to its suitability for any
-    purpose.</p>
-  </body>
-</html>

cast_test.cpp

@@ -1,91 +0,0 @@
-//  boost utility cast test program  -----------------------------------------//
-
-//  (C) Copyright Beman Dawes, Dave Abrahams 1999. Distributed under the Boost
-//  Software License, Version 1.0. (See accompanying file
-//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-//  See http://www.boost.org for most recent version including documentation.
-
-//  Revision History
-//   28 Set 04  factored out numeric_cast<> test (Fernando Cacciola)
-//   20 Jan 01  removed use of <limits> for portability to raw GCC (David Abrahams)
-//   28 Jun 00  implicit_cast removed (Beman Dawes)
-//   30 Aug 99  value_cast replaced by numeric_cast
-//    3 Aug 99  Initial Version
-
-#include <iostream>
-#include <climits>
-#include <cfloat>   // for DBL_MAX (Peter Schmid)
-#include <boost/cast.hpp>
-
-#  if SCHAR_MAX == LONG_MAX
-#      error "This test program doesn't work if SCHAR_MAX == LONG_MAX"
-#  endif
-
-using namespace boost;
-using std::cout;
-
-namespace
-{
-    struct Base
-    {
-        virtual char kind() { return 'B'; }
-    };
-
-    struct Base2
-    {
-        virtual char kind2() { return '2'; }
-    };
-
-    struct Derived : public Base, Base2
-    {
-        virtual char kind() { return 'D'; }
-    };
-}
-
-
-int main( int argc, char * argv[] )
-{
-#   ifdef NDEBUG
-        cout << "NDEBUG is defined\n";
-#   else
-        cout << "NDEBUG is not defined\n";
-#   endif
-
-    cout << "\nBeginning tests...\n";
-
-//  test polymorphic_cast  ---------------------------------------------------//
-
-    //  tests which should succeed
-    Base *    base = new Derived;
-    Base2 *   base2 = 0;
-    Derived * derived = 0;
-    derived = polymorphic_downcast<Derived*>( base );  // downcast
-    assert( derived->kind() == 'D' );
-
-    derived = 0;
-    derived = polymorphic_cast<Derived*>( base ); // downcast, throw on error
-    assert( derived->kind() == 'D' );
-
-    base2 = polymorphic_cast<Base2*>( base ); // crosscast
-    assert( base2->kind2() == '2' );
-
-     //  tests which should result in errors being detected
-    int err_count = 0;
-    base = new Base;
-
-    if ( argc > 1 && *argv[1] == '1' )
-        { derived = polymorphic_downcast<Derived*>( base ); } // #1 assert failure
-
-    bool caught_exception = false;
-    try { derived = polymorphic_cast<Derived*>( base ); }
-    catch (std::bad_cast)
-        { cout<<"caught bad_cast\n"; caught_exception = true; }
-    if ( !caught_exception ) ++err_count;
-    //  the following is just so generated code can be inspected
-    if ( derived->kind() == 'B' ) ++err_count;
-
-    cout << err_count << " errors detected\nTest "
-         << (err_count==0 ? "passed\n" : "failed\n");
-    return err_count;
-}   // main

doc/Jamfile.v2

@@ -0,0 +1,27 @@
+# Copyright Antony Polukhin, 2011-2026.
+#
+# Use, modification, and distribution are
+# subject to the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+using quickbook ;
+import boostbook : boostbook ;
+
+xml lexical_cast : lexical_cast.qbk ;
+boostbook standalone
+    :
+    lexical_cast
+    :
+        <xsl:param>boost.root=../../../..
+        <format>pdf:<xsl:param>boost.url.prefix=http://www.boost.org/doc/libs/release/doc/html
+    ;
+
+###############################################################################
+alias boostdoc
+    : lexical_cast
+    :
+    :
+    : ;
+explicit boostdoc ;
+alias boostrelease ;
+explicit boostrelease ;

doc/lexical_cast.qbk

@@ -0,0 +1,847 @@
+[library Boost.Lexical_Cast
+    [quickbook 1.5]
+    [version 1.0]
+    [copyright 2000-2005 Kevlin Henney]
+    [copyright 2006-2010 Alexander Nasonov]
+    [copyright 2011-2026 Antony Polukhin]
+    [category String and text processing]
+    [category Miscellaneous]
+    [license
+        Distributed under the Boost Software License, Version 1.0.
+        (See accompanying file LICENSE_1_0.txt or copy at
+        [@http://www.boost.org/LICENSE_1_0.txt])
+    ]
+]
+
+[def __numericcast__  [@boost:libs/numeric/conversion/doc/html/boost_numericconversion/improved_numeric_cast__.html `boost::numeric_cast`]]
+[def __proposallong__ [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1973.html Lexical Conversion Library Proposal for TR2, N1973 by Kevlin Henney and Beman Dawes]]
+[def __proposalshort__ [@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1973.html Lexical Conversion Library Proposal for TR2, N1973]]
+
+[section Motivation]
+Sometimes a value must be converted to a literal text form, such as an [c++] `int` represented as a `std::string`, or vice-versa, when a `std::string` is interpreted as an `int`. Such examples are common when converting between data types internal to a program and representation external to a program, such as windows and configuration files.
+
+The standard C and C++ libraries offer a number of facilities for performing such conversions. However, they vary with their ease of use, extensibility, and safety.
+
+For instance, there are a number of limitations with the family of standard C functions typified by `atoi`:
+
+* Conversion is supported in one direction only: from text to internal data type. Converting the other way using the C library requires either the inconvenience and compromised safety of the `sprintf` function, or the loss of portability associated with non-standard functions such as `itoa`.
+* The range of types supported is only a subset of the built-in numeric types, namely `int`, `long`, and `double`.
+* The range of types cannot be extended in a uniform manner. For instance, conversion from string representation to complex or rational.
+
+The standard C functions typified by `strtol` have the same basic limitations, but offer finer control over the conversion process. However, for the common case such control is often either not required or not used. The `scanf` family of functions offer even greater control, but also lack safety and ease of use.
+
+The standard C++ library offers `stringstream` for the kind of in-core formatting being discussed. It offers a great deal of control over the formatting and conversion of I/O to and from arbitrary types through text. However, for simple conversions direct use of `stringstream` can be either clumsy (with the introduction of extra local variables and the loss of infix-expression convenience) or obscure (where `stringstream` objects are created as temporary objects in an expression). Facets provide a comprehensive concept and facility for controlling textual representation, but their perceived complexity and high entry level requires an extreme degree of involvement for simple conversions, and excludes all but a few programmers.
+
+The `lexical_cast` function template offers a convenient and consistent form for supporting common conversions to and from arbitrary types when they are represented as text. The simplification it offers is in expression-level convenience for such conversions. For more involved conversions, such as where precision or formatting need tighter control than is offered by the default behavior of `lexical_cast`, the conventional `std::stringstream` approach is recommended. Where the conversions are numeric to numeric, __numericcast__ may offer more reasonable behavior than `lexical_cast`.
+
+For a good discussion of the options and issues involved in string-based formatting, including comparison of `stringstream`, `lexical_cast`, and others, see Herb Sutter's article, [@http://www.gotw.ca/publications/mill19.htm The String Formatters of Manor Farm]. Also, take a look at the [link boost_lexical_cast.performance Performance] section.
+[endsect]
+
+[section Examples]
+
+[import ../example/args_to_numbers.cpp]
+
+[section Strings to numbers conversion] [lexical_cast_args_example] [endsect]
+
+[import ../example/small_examples.cpp]
+[section Numbers to strings conversion] [lexical_cast_log_errno] [endsect]
+[section Converting to string without dynamic memory allocation] [lexical_cast_fixed_buffer] [endsect]
+[section Converting part of the string] [lexical_cast_substring_conversion] [endsect]
+
+[import ../example/generic_stringize.cpp]
+[section Generic programming (Boost.Fusion)] [lexical_cast_stringize] [endsect]
+
+[import ../example/variant_to_long_double.cpp]
+[section Generic programming (Boost.Variant)] [lexical_cast_variant_to_long_double] [endsect]
+
+[endsect]
+
+[section Synopsis]
+Library features defined in [@boost:boost/lexical_cast.hpp boost/lexical_cast.hpp]:
+``
+    namespace boost
+    {
+        class bad_lexical_cast;
+        
+        template<typename Target, typename Source>
+          Target lexical_cast(const Source& arg);
+
+        template <typename Target>
+          Target lexical_cast(const AnyCharacterType* chars, std::size_t count);
+
+        namespace conversion
+        {
+            template<typename Target, typename Source>
+                bool try_lexical_convert(const Source& arg, Target& result);
+
+            template <typename AnyCharacterType, typename Target>
+                bool try_lexical_convert(const AnyCharacterType* chars, std::size_t count, Target& result);
+
+        } // namespace conversion
+    } // namespace boost
+``
+
+[section lexical_cast]
+``
+    template<typename Target, typename Source>
+      Target lexical_cast(const Source& arg);
+``
+Returns the result of streaming arg into a standard library string-based stream and then out as a Target object. Where Target is either `std::string` or `std::wstring`, stream extraction takes the whole content of the string, including spaces, rather than relying on the default `operator>>` behavior. If the conversion is unsuccessful, a `bad_lexical_cast` exception is thrown.
+
+``
+    template <typename Target>
+      Target lexical_cast(const AnyCharacterType* chars, std::size_t count);
+``
+Takes an array of `count` characters as input parameter and streams them out as a Target object. If the conversion is unsuccessful, a `bad_lexical_cast` exception is thrown. This call may be useful for processing nonzero terminated array of characters or processing just some part of character array.
+
+The requirements on the argument and result types for both functions are:
+
+* Source is OutputStreamable, meaning that an `operator<<` is defined that takes a `std::ostream` or `std::wostream` object on the left hand side and an instance of the argument type on the right.
+* Target is InputStreamable, meaning that an `operator>>` is defined that takes a `std::istream` or `std::wistream` object on the left hand side and an instance of the result type on the right.
+* Target is CopyConstructible [20.1.3].
+* Target is DefaultConstructible, meaning that it is possible to default-initialize an object of that type [8.5, 20.1.4].
+
+The character type of the underlying stream is assumed to be `char` unless either the `Source` or the `Target` requires wide-character streaming, in which case the underlying stream uses `wchar_t`. Following types also can use `char16_t` or `char32_t` for wide-character streaming:
+
+* Single character: `char16_t`, `char32_t`
+* Arrays of characters: `char16_t *`, `char32_t *`, `const char16_t *`, `const char32_t *`
+* Strings: `std::basic_string`, `boost::containers::basic_string`
+* `boost::iterator_range<WideCharPtr>`, where `WideCharPtr` is a pointer to wide-character or pointer to const wide-character
+* `boost::array<CharT, N>` and `std::array<CharT, N>`, `boost::array<const CharT, N>` and `std::array<const CharT, N>` 
+
+[important Many compilers and runtime libraries fail to make conversions using new Unicode characters. Make sure that the following code compiles and outputs nonzero values, before using new types:
+``
+    std::cout
+        << boost::lexical_cast<std::u32string>(1.0).size()
+        << "  "
+        << boost::lexical_cast<std::u16string>(1.0).size();
+``
+]
+
+Where a higher degree of control is required over conversions, `std::stringstream` and `std::wstringstream` offer a more appropriate path. Where non-stream-based conversions are required, `lexical_cast` is the wrong tool for the job and is not special-cased for such scenarios.
+[endsect]
+
+[section bad_lexical_cast]
+``
+    class bad_lexical_cast : public std::bad_cast
+    {
+    public:
+        ... // same member function interface as std::exception
+    };
+``
+Exception used to indicate runtime lexical_cast failure.
+[endsect]
+
+[section try_lexical_convert]
+`boost::lexical_cast` remains the main interface for lexical conversions. It must be used by default in most cases. However
+some developers wish to make their own conversion functions, reusing all the optimizations of the `boost::lexical_cast`.
+That's where the `boost::conversion::try_lexical_convert` function steps in.
+
+`try_lexical_convert` returns `true` if conversion succeeded, otherwise returns `false`. If conversion
+failed and `false` was returned, state of `result` output variable is undefined.
+
+Actually, `boost::lexical_cast` is implemented using `try_lexical_convert`:
+``
+    template <typename Target, typename Source>
+    inline Target lexical_cast(const Source &arg)
+    {
+        Target result;
+
+        if (!conversion::try_lexical_convert(arg, result))
+            throw bad_lexical_cast();
+
+        return result;
+    }
+``
+
+`try_lexical_convert` relaxes the CopyConstructible and DefaultConstructible requirements for `Target` type.
+Following requirements for `Target` and `Source` remain:
+
+* Source must be OutputStreamable, meaning that an `operator<<` is defined that takes a `std::ostream` or `std::wostream` object on the left hand side and an instance of the argument type on the right.
+* Target must be InputStreamable, meaning that an `operator>>` is defined that takes a `std::istream` or `std::wistream` object on the left hand side and an instance of the result type on the right.
+
+[endsect]
+
+
+[endsect]
+
+[section Frequently Asked Questions]
+
+* [*Question:]    Why does `lexical_cast<int8_t>("127")` throw `bad_lexical_cast`?
+  * [*Answer:]      The type `int8_t` is a `typedef` to `char` or `signed char`. Lexical conversion to these types is simply reading a byte from source but since the source has more than one byte, the exception is thrown.
+Please use other integer types such as `int` or `short int`. If bounds checking is important, you can also
+call __numericcast__:
+`numeric_cast<int8_t>(lexical_cast<int>("127"));`
+
+[pre
+]
+
+* [*Question:]    Why does `lexical_cast<unsigned char>("127")` throw `bad_lexical_cast`?
+  * [*Answer:]      Lexical conversion to any char type is simply reading a byte from source. But since the source has more than one byte, the exception is thrown.
+Please use other integer types such as `int` or `short int`. If bounds checking is important, you can also
+call __numericcast__:
+`numeric_cast<unsigned char>(lexical_cast<int>("127"));`
+
+[pre
+]
+
+* [*Question:]    What does `lexical_cast<std::string>` of an `int8_t` or `uint8_t` not do what I expect?
+  * [*Answer:]      As above, note that int8_t and uint8_t are actually chars and are formatted as such. To avoid
+this, cast to an integer type first: `lexical_cast<std::string>(static_cast<int>(n));`
+
+[pre
+]
+
+* [*Question:]    The implementation always resets the `ios_base::skipws` flag of an underlying stream object.
+It breaks my `operator>>` that works only in presence of this flag. Can you remove code that resets the flag?
+  * [*Answer:]      May be in a future version. There is no requirement in
+__proposallong__ to reset the flag but
+remember that __proposalshort__ is not yet accepted by the committee. By the way, it's a great opportunity to
+make your `operator>>` more general.
+Read a good C++ book, study `std::sentry` and [@boost:libs/io/doc/ios_state.html `ios_state_saver`].
+
+[pre
+]
+
+* [*Question:]    Why does `std::cout << boost::lexical_cast<unsigned int>("-1");` not throw, but outputs 4294967295?
+  * [*Answer:]      `boost::lexical_cast` has the behavior of `std::stringstream`, which uses `num_get` functions of
+`std::locale` to convert numbers. If we look at the Programming languages — C++, we'll see, that `num_get` uses
+the rules of `scanf` for conversions. And in the C99 standard for unsigned input value minus sign is optional, so
+if a negative number is read, no errors will arise and the result will be the two's complement.
+
+[pre
+]
+
+* [*Question:]    Why does `boost::lexical_cast<int>(L'A');` output 65 and `boost::lexical_cast<wchar_t>(L"65");` not throw?
+  * [*Answer:]      If you are using an old version of Visual Studio or compile code with /Zc:wchar_t- flag,
+`boost::lexical_cast` sees single `wchar_t` character as `unsigned short`. It is not a `boost::lexical_cast` mistake, but a
+limitation of compiler options that you use.
+
+[pre
+]
+
+* [*Question:]    Why does `boost::lexical_cast<double>("-1.#IND");` throw `boost::bad_lexical_cast`?
+  * [*Answer:]      `"-1.#IND"` is a compiler extension, that violates standard. You shall input `"-nan"`, `"nan"`, `"inf"`
+, `"-inf"` (case insensitive) strings to get NaN and Inf values. `boost::lexical_cast<string>` outputs `"-nan"`, `"nan"`,
+`"inf"`, `"-inf"` strings, when has NaN or Inf input values.
+
+[pre
+]
+
+* [*Question:]    What is the fastest way to convert a non zero terminated string or a substring using `boost::lexical_cast`?
+  * [*Answer:]      Use `boost::iterator_range` for conversion or `lexical_cast` overload with two parameters. For example, if you want to convert to `int` two characters from a string `str`, you shall write `lexical_cast<int>(make_iterator_range(str.data(), str.data() + 2));` or `lexical_cast<int>(str.data(), 2);`.
+
+[endsect]
+
+[section C++20 module]
+
+[caution C++20 module support is on early stage, targets, flags and behavior may change in the future]
+
+If using modern CMake define CMake option `-DBOOST_USE_MODULES=1` to build a C++20 module and
+make the `Boost::lexical_cast` CMake target provide it. After that an explicit usage of C++20 module `boost.lexical_cast` is allowed:
+
+[import ../modules/usage_sample.cpp]
+[lexical_cast_module_example]
+
+The `Boost::lexical_cast` CMake target gives an ability to mix includes and imports of the library in different translation units. Moreover,
+if `BOOST_USE_MODULES` macro is defined then all the `boost/lexical_cast...` includes implicitly do `import boost.lexical_cast;` to give all the
+benefits of modules without changing the existing code.
+
+[note For better compile times make sure that `import std;` is available when building the `boost.lexical_cast` module (in CMake logs there should be
+      a 'Using `import std;`' message). ]
+
+If not using CMake, then the module could be build manually from the `modules/boost_lexical_cast.cppm` file.
+
+For manual module build the following commands could be used for clang compiler:
+
+```
+cd lexical_cast/modules
+clang++ -I ../include -std=c++20 --precompile -x c++-module boost_lexical_cast.cppm
+```
+
+After that, the module could be used in the following way:
+
+```
+clang++ -std=c++20 -fmodule-file=boost_lexical_cast.pcm boost_lexical_cast.pcm usage_sample.cpp
+```
+
+[endsect]
+
+[section Changes]
+
+* [*boost 1.91.0 :]
+    * Added C++20 modules support.
+
+* [*boost 1.86.0 :]
+
+    * Fixed conversion of `std::basic_string_view` and `boost::basic_string_view`
+      containing one or more `\0` characters. Issue was introduced in 1.85.0.
+
+* [*boost 1.85.0 :]
+
+    * Significant rewrite of the internal logic to separate optimized and C++ Standard Library IO-based streams:
+      * C++ Standard Library based streams now constructed in less cases leading to [*better performance];
+      * less template instantiations and simpler code;
+      * always use `std::char_traits` (do not use custom traits from input/output types as it leads to linktime or runtime errors);
+      * support for `volatile` input types was dropped, following the C++ Standard Library trend.
+    * Optimized conversions from std::basic_string_view and boost::basic_string_view
+    * Dropped dependency on Boost.NumericConversion and Boost.MPL. Fixed some cases
+      of converting floting point types to arithmetics.
+    * The library now works fine with `-fno-sanitize-recover=integer`.
+
+* [*boost 1.84.0 :]
+
+    * Dropped support of C++98 and C++03.
+
+* [*boost 1.56.0 :]
+
+    * Added `boost::conversion::try_lexical_convert` functions.
+
+* [*boost 1.54.0 :]
+
+    * Fix some issues with `boost::int128_type` and `boost::uint128_type` conversions. Notify user at compile time 
+      if the `std::numeric_limits` are not specialized for 128bit types and `boost::lexical_cast` can not make conversions.
+
+* [*boost 1.54.0 :]
+
+    * Added code to convert `boost::int128_type` and `boost::uint128_type` types (requires GCC 4.7 or higher).
+    * Conversions to pointers will now fail to compile, instead of throwing at runtime.
+    * Restored ability to get pointers to `lexical_cast` function (was broken in 1.53.0).
+
+* [*boost 1.53.0 :]
+
+    * Much better input and output streams detection for user defined types.
+
+* [*boost 1.52.0 :]
+
+    * Restored compilation on MSVC-2003 (was broken in 1.51.0).
+    * Added `lexical_cast(const CharType* chars, std::size_t count)` function overload.
+    
+* [*boost 1.51.0 :]
+
+    * Better performance, less memory usage for `boost::array<character_type, N>` and `std::array<character_type, N>` conversions.
+
+* [*boost 1.50.0 :]
+
+    * `boost::bad_lexical_cast` exception is now globaly visible and can be catched even if code is compiled with -fvisibility=hidden.
+    * Now it is possible to compile library with disabled exceptions.
+    * Better performance, less memory usage and bugfixes for `boost::iterator_range<character_type*>` conversions.
+
+* [*boost 1.49.0 :]
+
+    * Restored work with typedefed wchar_t (compilation flag /Zc:wchar_t- for Visual Studio).
+    * Better performance and less memory usage for `boost::container::basic_string` conversions.
+
+* [*boost 1.48.0 :]
+
+    * Added code to work with Inf and NaN on any platform.
+    * Better performance and less memory usage for conversions to float type (and to double type, if `sizeof(double) < sizeof(long double)`).
+
+* [*boost 1.47.0 :]
+
+    * Optimizations for "C" and other locales without number grouping.
+    * Better performance and less memory usage for unsigned char and signed char conversions.
+    * Better performance and less memory usage for conversions to arithmetic types.
+    * Better performance and less memory usage for conversions from arithmetic type to arithmetic type.
+    * Directly construct Target from Source on some conversions (like conversions from string to string, from char array to string, from char to char and others).
+
+* [*boost 1.34.0 :]
+
+    * Better performance for many combinations of Source and Target types. For more details refer to Alexander Nasonovs article [@http://accu.org/index.php/journals/1375 Fine Tuning for lexical_cast, Overload #74, August 2006] [@http://www.accu.org/var/uploads/journals/overload74.pdf (PDF)].
+
+* [*boost 1.33.0 :]
+
+    * Call-by-const reference for the parameters. This requires partial specialization of class templates, so it doesn't work for MSVC 6, and it uses the original pass by value there.
+    * The MSVC 6 support is deprecated, and will be removed in a future Boost version.
+
+* [*Earlier :]
+
+    * The previous version of lexical_cast used the default stream precision for reading and writing floating-point numbers. For numerics that have a corresponding specialization of `std::numeric_limits`, the current version now chooses a precision to match.
+    * The previous version of lexical_cast did not support conversion to or from any wide-character-based types. For compilers with full language and library support for wide characters, `lexical_cast` now supports conversions from `wchar_t`, `wchar_t *`, and `std::wstring` and to `wchar_t` and `std::wstring`.
+    * The previous version of `lexical_cast` assumed that the conventional stream extractor operators were sufficient for reading values. However, string I/O is asymmetric, with the result that spaces play the role of I/O separators rather than string content. The current version fixes this error for `std::string` and, where supported, `std::wstring`: `lexical_cast<std::string>("Hello, World")` succeeds instead of failing with a `bad_lexical_cast` exception.
+    * The previous version of `lexical_cast` allowed unsafe and meaningless conversions to pointers. The current version now throws a `bad_lexical_cast` for conversions to pointers: `lexical_cast<char *>("Goodbye, World")` now throws an exception instead of causing undefined behavior.
+
+[endsect]
+
+[section Performance]
+
+In most cases `boost::lexical_cast` is faster than `scanf`, `printf`, `std::stringstream`. For more detailed info you can look at the tables below.
+
+[section Tests description]
+All the tests measure execution speed in milliseconds for 10000 iterations of the following code blocks:
+[table:legend Tests source code
+[[Test name] [Code]]
+[[lexical_cast]
+  [``
+            _out = boost::lexical_cast<OUTTYPE>(_in);
+  ``]
+  ]
+[[std::stringstream with construction]
+  [``
+            std::stringstream ss;
+            ss << _in;
+            if (ss.fail()) throw std::logic_error(descr);
+            ss >> _out;
+            if (ss.fail()) throw std::logic_error(descr);
+  ``]
+  ]
+[[std::stringstream without construction]
+  [``
+            ss << _in; // ss is an instance of std::stringstream
+            if (ss.fail()) throw std::logic_error(descr);
+            ss >> _out;
+            if (ss.fail()) throw std::logic_error(descr);
+            /* reseting std::stringstream to use it again */
+            ss.str(std::string());
+            ss.clear();
+  ``]
+  ]
+[[scanf/printf]
+  [``
+            typename OUTTYPE::value_type buffer[500];
+            sprintf( (char*)buffer, conv, _in);
+            _out = buffer;
+  ``]
+  ]
+]
+Fastest results are highlitened with "!!! *x* !!!".
+Do not use this results to compare compilers, because tests were taken on different hardware.
+
+[endsect]
+
+[/ BEGIN of section, generated by performance measuring program ]
+
+
+
+[section GNU C++ version 9.4.0]
+[table:id Performance Table ( GNU C++ version 9.4.0)
+[[From->To] [lexical_cast] [std::stringstream with construction] [std::stringstream without construction][scanf/printf]]
+  [[ string->char ][ !!! *<1* !!! ][ 59 ][ 7 ][ 17 ]]
+  [[ string->signed char ][ !!! *<1* !!! ][ 142 ][ 13 ][ 21 ]]
+  [[ string->unsigned char ][ !!! *<1* !!! ][ 63 ][ 5 ][ 8 ]]
+  [[ string->int ][ !!! *4* !!! ][ 63 ][ 13 ][ 12 ]]
+  [[ string->short ][ !!! *4* !!! ][ 65 ][ 12 ][ 12 ]]
+  [[ string->long int ][ !!! *4* !!! ][ 62 ][ 12 ][ 12 ]]
+  [[ string->long long ][ !!! *3* !!! ][ 61 ][ 13 ][ 12 ]]
+  [[ string->unsigned int ][ !!! *4* !!! ][ 58 ][ 10 ][ 12 ]]
+  [[ string->unsigned short ][ !!! *4* !!! ][ 59 ][ 10 ][ 12 ]]
+  [[ string->unsigned long int ][ !!! *4* !!! ][ 62 ][ 11 ][ 12 ]]
+  [[ string->unsigned long long ][ !!! *4* !!! ][ 64 ][ 11 ][ 12 ]]
+  [[ string->float ][ 59 ][ 92 ][ 35 ][ !!! *23* !!! ]]
+  [[ string->double ][ 55 ][ 89 ][ 31 ][ !!! *23* !!! ]]
+  [[ string->long double ][ 52 ][ 83 ][ 32 ][ !!! *26* !!! ]]
+  [[ string->array<char, 50> ][ !!! *<1* !!! ][ 59 ][ 10 ][ 8 ]]
+  [[ string->string ][ !!! *1* !!! ][ 68 ][ 13 ][ --- ]]
+  [[ string->container::string ][ !!! *<1* !!! ][ 65 ][ 11 ][ --- ]]
+  [[ string->char ][ !!! *1* !!! ][ 58 ][ 10 ][ 7 ]]
+  [[ string->signed char ][ !!! *1* !!! ][ 57 ][ 10 ][ 10 ]]
+  [[ string->unsigned char ][ !!! *1* !!! ][ 57 ][ 10 ][ 10 ]]
+  [[ int->string ][ !!! *4* !!! ][ 64 ][ 13 ][ 10 ]]
+  [[ short->string ][ !!! *4* !!! ][ 69 ][ 13 ][ 10 ]]
+  [[ long int->string ][ !!! *4* !!! ][ 68 ][ 13 ][ 10 ]]
+  [[ long long->string ][ !!! *4* !!! ][ 66 ][ 13 ][ 10 ]]
+  [[ unsigned int->string ][ !!! *4* !!! ][ 62 ][ 14 ][ 10 ]]
+  [[ unsigned short->string ][ !!! *4* !!! ][ 66 ][ 13 ][ 10 ]]
+  [[ unsigned long int->string ][ !!! *4* !!! ][ 70 ][ 13 ][ 10 ]]
+  [[ unsigned long long->string ][ !!! *4* !!! ][ 64 ][ 14 ][ 10 ]]
+  [[ float->string ][ 26 ][ 108 ][ 50 ][ !!! *23* !!! ]]
+  [[ double->string ][ 33 ][ 114 ][ 51 ][ !!! *26* !!! ]]
+  [[ long double->string ][ 88 ][ 194 ][ 54 ][ !!! *26* !!! ]]
+  [[ char*->char ][ !!! *<1* !!! ][ 53 ][ 6 ][ 5 ]]
+  [[ char*->signed char ][ !!! *<1* !!! ][ 52 ][ 6 ][ 7 ]]
+  [[ char*->unsigned char ][ !!! *<1* !!! ][ 55 ][ 6 ][ 7 ]]
+  [[ char*->int ][ !!! *4* !!! ][ 67 ][ 12 ][ 10 ]]
+  [[ char*->short ][ !!! *4* !!! ][ 68 ][ 13 ][ 10 ]]
+  [[ char*->long int ][ !!! *3* !!! ][ 68 ][ 13 ][ 10 ]]
+  [[ char*->long long ][ !!! *3* !!! ][ 67 ][ 14 ][ 10 ]]
+  [[ char*->unsigned int ][ !!! *3* !!! ][ 67 ][ 11 ][ 10 ]]
+  [[ char*->unsigned short ][ !!! *3* !!! ][ 61 ][ 11 ][ 11 ]]
+  [[ char*->unsigned long int ][ !!! *3* !!! ][ 61 ][ 13 ][ 10 ]]
+  [[ char*->unsigned long long ][ !!! *3* !!! ][ 67 ][ 13 ][ 10 ]]
+  [[ char*->float ][ 56 ][ 93 ][ 35 ][ !!! *21* !!! ]]
+  [[ char*->double ][ 59 ][ 88 ][ 33 ][ !!! *21* !!! ]]
+  [[ char*->long double ][ 54 ][ 88 ][ 33 ][ !!! *24* !!! ]]
+  [[ char*->array<char, 50> ][ !!! *<1* !!! ][ 63 ][ 11 ][ 8 ]]
+  [[ char*->string ][ !!! *1* !!! ][ 65 ][ 12 ][ --- ]]
+  [[ char*->container::string ][ !!! *<1* !!! ][ 71 ][ 13 ][ --- ]]
+  [[ unsigned char*->char ][ !!! *<1* !!! ][ 57 ][ 6 ][ 5 ]]
+  [[ unsigned char*->signed char ][ !!! *<1* !!! ][ 57 ][ 6 ][ 7 ]]
+  [[ unsigned char*->unsigned char ][ !!! *<1* !!! ][ 63 ][ 5 ][ 6 ]]
+  [[ unsigned char*->int ][ !!! *4* !!! ][ 63 ][ 12 ][ 10 ]]
+  [[ unsigned char*->short ][ !!! *4* !!! ][ 65 ][ 13 ][ 10 ]]
+  [[ unsigned char*->long int ][ !!! *3* !!! ][ 67 ][ 12 ][ 10 ]]
+  [[ unsigned char*->long long ][ !!! *3* !!! ][ 66 ][ 12 ][ 10 ]]
+  [[ unsigned char*->unsigned int ][ !!! *3* !!! ][ 64 ][ 11 ][ 10 ]]
+  [[ unsigned char*->unsigned short ][ !!! *3* !!! ][ 65 ][ 12 ][ 10 ]]
+  [[ unsigned char*->unsigned long int ][ !!! *3* !!! ][ 60 ][ 13 ][ 10 ]]
+  [[ unsigned char*->unsigned long long ][ !!! *3* !!! ][ 62 ][ 12 ][ 10 ]]
+  [[ unsigned char*->float ][ 57 ][ 94 ][ 34 ][ !!! *21* !!! ]]
+  [[ unsigned char*->double ][ 60 ][ 88 ][ 35 ][ !!! *21* !!! ]]
+  [[ unsigned char*->long double ][ 54 ][ 89 ][ 32 ][ !!! *24* !!! ]]
+  [[ unsigned char*->array<char, 50> ][ !!! *<1* !!! ][ 68 ][ 12 ][ 8 ]]
+  [[ unsigned char*->string ][ !!! *1* !!! ][ 61 ][ 13 ][ --- ]]
+  [[ unsigned char*->container::string ][ !!! *<1* !!! ][ 66 ][ 12 ][ --- ]]
+  [[ signed char*->char ][ !!! *<1* !!! ][ 58 ][ 6 ][ 5 ]]
+  [[ signed char*->signed char ][ !!! *<1* !!! ][ 59 ][ 6 ][ 7 ]]
+  [[ signed char*->unsigned char ][ !!! *<1* !!! ][ 57 ][ 6 ][ 7 ]]
+  [[ signed char*->int ][ !!! *4* !!! ][ 68 ][ 12 ][ 10 ]]
+  [[ signed char*->short ][ !!! *4* !!! ][ 68 ][ 12 ][ 10 ]]
+  [[ signed char*->long int ][ !!! *3* !!! ][ 69 ][ 12 ][ 10 ]]
+  [[ signed char*->long long ][ !!! *3* !!! ][ 61 ][ 12 ][ 11 ]]
+  [[ signed char*->unsigned int ][ !!! *3* !!! ][ 59 ][ 11 ][ 10 ]]
+  [[ signed char*->unsigned short ][ !!! *3* !!! ][ 58 ][ 11 ][ 10 ]]
+  [[ signed char*->unsigned long int ][ !!! *3* !!! ][ 59 ][ 12 ][ 10 ]]
+  [[ signed char*->unsigned long long ][ !!! *3* !!! ][ 68 ][ 12 ][ 10 ]]
+  [[ signed char*->float ][ 55 ][ 93 ][ 39 ][ !!! *22* !!! ]]
+  [[ signed char*->double ][ 56 ][ 95 ][ 34 ][ !!! *23* !!! ]]
+  [[ signed char*->long double ][ 58 ][ 89 ][ 32 ][ !!! *23* !!! ]]
+  [[ signed char*->array<char, 50> ][ !!! *<1* !!! ][ 70 ][ 11 ][ 8 ]]
+  [[ signed char*->string ][ !!! *1* !!! ][ 64 ][ 15 ][ --- ]]
+  [[ signed char*->container::string ][ !!! *1* !!! ][ 67 ][ 13 ][ --- ]]
+  [[ iterator_range<char*>->char ][ !!! *<1* !!! ][ 62 ][ 6 ][ 7 ]]
+  [[ iterator_range<char*>->signed char ][ !!! *<1* !!! ][ 56 ][ 6 ][ 8 ]]
+  [[ iterator_range<char*>->unsigned char ][ !!! *<1* !!! ][ 57 ][ 5 ][ 11 ]]
+  [[ iterator_range<char*>->int ][ !!! *4* !!! ][ 75 ][ 16 ][ 12 ]]
+  [[ iterator_range<char*>->short ][ !!! *3* !!! ][ 69 ][ 16 ][ 12 ]]
+  [[ iterator_range<char*>->long int ][ !!! *3* !!! ][ 66 ][ 21 ][ 12 ]]
+  [[ iterator_range<char*>->long long ][ !!! *3* !!! ][ 70 ][ 15 ][ 12 ]]
+  [[ iterator_range<char*>->unsigned int ][ !!! *3* !!! ][ 67 ][ 16 ][ 12 ]]
+  [[ iterator_range<char*>->unsigned short ][ !!! *3* !!! ][ 64 ][ 14 ][ 12 ]]
+  [[ iterator_range<char*>->unsigned long int ][ !!! *3* !!! ][ 66 ][ 15 ][ 12 ]]
+  [[ iterator_range<char*>->unsigned long long ][ !!! *3* !!! ][ 72 ][ 17 ][ 12 ]]
+  [[ iterator_range<char*>->float ][ 55 ][ 100 ][ 42 ][ !!! *23* !!! ]]
+  [[ iterator_range<char*>->double ][ 54 ][ 100 ][ 40 ][ !!! *23* !!! ]]
+  [[ iterator_range<char*>->long double ][ 56 ][ 100 ][ 39 ][ !!! *25* !!! ]]
+  [[ iterator_range<char*>->array<char, 50> ][ !!! *<1* !!! ][ 69 ][ 20 ][ 10 ]]
+  [[ iterator_range<char*>->string ][ !!! *1* !!! ][ 72 ][ 21 ][ --- ]]
+  [[ iterator_range<char*>->container::string ][ !!! *<1* !!! ][ 82 ][ 21 ][ --- ]]
+  [[ std::string_view->char ][ !!! *<1* !!! ][ 65 ][ 5 ][ 8 ]]
+  [[ std::string_view->signed char ][ !!! *<1* !!! ][ 61 ][ 6 ][ 10 ]]
+  [[ std::string_view->unsigned char ][ !!! *<1* !!! ][ 56 ][ 5 ][ 9 ]]
+  [[ std::string_view->int ][ !!! *4* !!! ][ 59 ][ 12 ][ 14 ]]
+  [[ std::string_view->short ][ !!! *4* !!! ][ 63 ][ 12 ][ 14 ]]
+  [[ std::string_view->long int ][ !!! *4* !!! ][ 61 ][ 11 ][ 13 ]]
+  [[ std::string_view->long long ][ !!! *4* !!! ][ 58 ][ 13 ][ 14 ]]
+  [[ std::string_view->unsigned int ][ !!! *3* !!! ][ 65 ][ 10 ][ 13 ]]
+  [[ std::string_view->unsigned short ][ !!! *3* !!! ][ 64 ][ 10 ][ 14 ]]
+  [[ std::string_view->unsigned long int ][ !!! *3* !!! ][ 64 ][ 12 ][ 13 ]]
+  [[ std::string_view->unsigned long long ][ !!! *3* !!! ][ 65 ][ 11 ][ 14 ]]
+  [[ std::string_view->float ][ 55 ][ 89 ][ 35 ][ !!! *24* !!! ]]
+  [[ std::string_view->double ][ 53 ][ 87 ][ 36 ][ !!! *25* !!! ]]
+  [[ std::string_view->long double ][ 56 ][ 93 ][ 34 ][ !!! *28* !!! ]]
+  [[ std::string_view->array<char, 50> ][ !!! *1* !!! ][ 64 ][ 10 ][ 11 ]]
+  [[ std::string_view->string ][ !!! *1* !!! ][ 62 ][ 11 ][ --- ]]
+  [[ std::string_view->container::string ][ !!! *1* !!! ][ 65 ][ 11 ][ --- ]]
+  [[ array<char, 50>->char ][ !!! *<1* !!! ][ 54 ][ 6 ][ 5 ]]
+  [[ array<char, 50>->signed char ][ !!! *<1* !!! ][ 54 ][ 5 ][ 7 ]]
+  [[ array<char, 50>->unsigned char ][ !!! *<1* !!! ][ 53 ][ 6 ][ 6 ]]
+  [[ array<char, 50>->int ][ !!! *2* !!! ][ 59 ][ 12 ][ 10 ]]
+  [[ array<char, 50>->short ][ !!! *3* !!! ][ 58 ][ 12 ][ 10 ]]
+  [[ array<char, 50>->long int ][ !!! *3* !!! ][ 57 ][ 12 ][ 10 ]]
+  [[ array<char, 50>->long long ][ !!! *3* !!! ][ 60 ][ 12 ][ 10 ]]
+  [[ array<char, 50>->unsigned int ][ !!! *3* !!! ][ 60 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->unsigned short ][ !!! *3* !!! ][ 58 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->unsigned long int ][ !!! *3* !!! ][ 61 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->unsigned long long ][ !!! *3* !!! ][ 59 ][ 12 ][ 10 ]]
+  [[ array<char, 50>->float ][ 52 ][ 89 ][ 35 ][ !!! *21* !!! ]]
+  [[ array<char, 50>->double ][ 50 ][ 91 ][ 33 ][ !!! *21* !!! ]]
+  [[ array<char, 50>->long double ][ 52 ][ 83 ][ 33 ][ !!! *23* !!! ]]
+  [[ array<char, 50>->array<char, 50> ][ !!! *<1* !!! ][ 59 ][ 11 ][ 8 ]]
+  [[ array<char, 50>->string ][ !!! *1* !!! ][ 66 ][ 13 ][ --- ]]
+  [[ array<char, 50>->container::string ][ !!! *1* !!! ][ 61 ][ 12 ][ --- ]]
+  [[ int->int ][ !!! *<1* !!! ][ 61 ][ 14 ][ --- ]]
+  [[ float->double ][ !!! *<1* !!! ][ 136 ][ 72 ][ --- ]]
+  [[ char->signed char ][ !!! *<1* !!! ][ 54 ][ 5 ][ --- ]]
+]
+[endsect]
+
+[section Clang version 15.0.7 ]
+[table:id Performance Table ( Clang version 15.0.7 )
+[[From->To] [lexical_cast] [std::stringstream with construction] [std::stringstream without construction][scanf/printf]]
+  [[ string->char ][ !!! *<1* !!! ][ 68 ][ 5 ][ 6 ]]
+  [[ string->signed char ][ !!! *<1* !!! ][ 59 ][ 5 ][ 7 ]]
+  [[ string->unsigned char ][ !!! *<1* !!! ][ 59 ][ 5 ][ 7 ]]
+  [[ string->int ][ !!! *3* !!! ][ 69 ][ 11 ][ 10 ]]
+  [[ string->short ][ !!! *3* !!! ][ 64 ][ 11 ][ 10 ]]
+  [[ string->long int ][ !!! *3* !!! ][ 65 ][ 11 ][ 10 ]]
+  [[ string->long long ][ !!! *3* !!! ][ 68 ][ 13 ][ 10 ]]
+  [[ string->unsigned int ][ !!! *3* !!! ][ 65 ][ 10 ][ 10 ]]
+  [[ string->unsigned short ][ !!! *3* !!! ][ 64 ][ 10 ][ 10 ]]
+  [[ string->unsigned long int ][ !!! *3* !!! ][ 62 ][ 11 ][ 10 ]]
+  [[ string->unsigned long long ][ !!! *3* !!! ][ 64 ][ 11 ][ 10 ]]
+  [[ string->float ][ 55 ][ 90 ][ 33 ][ !!! *22* !!! ]]
+  [[ string->double ][ 56 ][ 89 ][ 32 ][ !!! *22* !!! ]]
+  [[ string->long double ][ 55 ][ 92 ][ 32 ][ !!! *23* !!! ]]
+  [[ string->array<char, 50> ][ !!! *<1* !!! ][ 66 ][ 10 ][ 8 ]]
+  [[ string->string ][ !!! *1* !!! ][ 66 ][ 12 ][ --- ]]
+  [[ string->container::string ][ !!! *<1* !!! ][ 66 ][ 15 ][ --- ]]
+  [[ string->char ][ !!! *<1* !!! ][ 61 ][ 9 ][ 1 ]]
+  [[ string->signed char ][ !!! *<1* !!! ][ 62 ][ 9 ][ 10 ]]
+  [[ string->unsigned char ][ !!! *<1* !!! ][ 59 ][ 9 ][ 10 ]]
+  [[ int->string ][ !!! *4* !!! ][ 63 ][ 13 ][ 9 ]]
+  [[ short->string ][ !!! *4* !!! ][ 69 ][ 13 ][ 10 ]]
+  [[ long int->string ][ !!! *4* !!! ][ 67 ][ 13 ][ 10 ]]
+  [[ long long->string ][ !!! *4* !!! ][ 65 ][ 13 ][ 10 ]]
+  [[ unsigned int->string ][ !!! *4* !!! ][ 66 ][ 13 ][ 10 ]]
+  [[ unsigned short->string ][ !!! *4* !!! ][ 67 ][ 13 ][ 10 ]]
+  [[ unsigned long int->string ][ !!! *4* !!! ][ 66 ][ 12 ][ 10 ]]
+  [[ unsigned long long->string ][ !!! *4* !!! ][ 67 ][ 13 ][ 10 ]]
+  [[ float->string ][ 25 ][ 108 ][ 47 ][ !!! *22* !!! ]]
+  [[ double->string ][ !!! *32* !!! ][ 130 ][ 116 ][ 56 ]]
+  [[ long double->string ][ 103 ][ 266 ][ 123 ][ !!! *64* !!! ]]
+  [[ char*->char ][ !!! *<1* !!! ][ 129 ][ 13 ][ 14 ]]
+  [[ char*->signed char ][ !!! *<1* !!! ][ 131 ][ 13 ][ 17 ]]
+  [[ char*->unsigned char ][ !!! *<1* !!! ][ 133 ][ 13 ][ 17 ]]
+  [[ char*->int ][ !!! *7* !!! ][ 154 ][ 32 ][ 26 ]]
+  [[ char*->short ][ !!! *7* !!! ][ 161 ][ 29 ][ 27 ]]
+  [[ char*->long int ][ !!! *7* !!! ][ 159 ][ 30 ][ 27 ]]
+  [[ char*->long long ][ !!! *7* !!! ][ 158 ][ 28 ][ 26 ]]
+  [[ char*->unsigned int ][ !!! *7* !!! ][ 146 ][ 26 ][ 26 ]]
+  [[ char*->unsigned short ][ !!! *7* !!! ][ 150 ][ 26 ][ 26 ]]
+  [[ char*->unsigned long int ][ !!! *7* !!! ][ 159 ][ 28 ][ 26 ]]
+  [[ char*->unsigned long long ][ !!! *7* !!! ][ 158 ][ 30 ][ 27 ]]
+  [[ char*->float ][ 123 ][ 207 ][ 78 ][ !!! *54* !!! ]]
+  [[ char*->double ][ 135 ][ 218 ][ 77 ][ !!! *54* !!! ]]
+  [[ char*->long double ][ 130 ][ 216 ][ 82 ][ !!! *59* !!! ]]
+  [[ char*->array<char, 50> ][ !!! *<1* !!! ][ 153 ][ 25 ][ 21 ]]
+  [[ char*->string ][ !!! *2* !!! ][ 159 ][ 31 ][ --- ]]
+  [[ char*->container::string ][ !!! *3* !!! ][ 151 ][ 15 ][ --- ]]
+  [[ unsigned char*->char ][ !!! *<1* !!! ][ 56 ][ 5 ][ 6 ]]
+  [[ unsigned char*->signed char ][ !!! *<1* !!! ][ 58 ][ 5 ][ 7 ]]
+  [[ unsigned char*->unsigned char ][ !!! *<1* !!! ][ 59 ][ 5 ][ 7 ]]
+  [[ unsigned char*->int ][ !!! *3* !!! ][ 58 ][ 12 ][ 11 ]]
+  [[ unsigned char*->short ][ !!! *3* !!! ][ 67 ][ 12 ][ 11 ]]
+  [[ unsigned char*->long int ][ !!! *3* !!! ][ 67 ][ 12 ][ 11 ]]
+  [[ unsigned char*->long long ][ !!! *3* !!! ][ 70 ][ 11 ][ 11 ]]
+  [[ unsigned char*->unsigned int ][ !!! *3* !!! ][ 60 ][ 10 ][ 10 ]]
+  [[ unsigned char*->unsigned short ][ !!! *3* !!! ][ 65 ][ 10 ][ 11 ]]
+  [[ unsigned char*->unsigned long int ][ !!! *3* !!! ][ 61 ][ 11 ][ 10 ]]
+  [[ unsigned char*->unsigned long long ][ !!! *3* !!! ][ 58 ][ 11 ][ 10 ]]
+  [[ unsigned char*->float ][ 51 ][ 88 ][ 32 ][ !!! *22* !!! ]]
+  [[ unsigned char*->double ][ 54 ][ 88 ][ 32 ][ !!! *22* !!! ]]
+  [[ unsigned char*->long double ][ 51 ][ 88 ][ 35 ][ !!! *24* !!! ]]
+  [[ unsigned char*->array<char, 50> ][ !!! *<1* !!! ][ 127 ][ 26 ][ 21 ]]
+  [[ unsigned char*->string ][ !!! *2* !!! ][ 90 ][ 11 ][ --- ]]
+  [[ unsigned char*->container::string ][ !!! *1* !!! ][ 62 ][ 15 ][ --- ]]
+  [[ signed char*->char ][ !!! *<1* !!! ][ 52 ][ 5 ][ 5 ]]
+  [[ signed char*->signed char ][ !!! *<1* !!! ][ 53 ][ 5 ][ 7 ]]
+  [[ signed char*->unsigned char ][ !!! *<1* !!! ][ 52 ][ 5 ][ 7 ]]
+  [[ signed char*->int ][ !!! *3* !!! ][ 60 ][ 12 ][ 11 ]]
+  [[ signed char*->short ][ !!! *3* !!! ][ 63 ][ 12 ][ 11 ]]
+  [[ signed char*->long int ][ !!! *3* !!! ][ 63 ][ 11 ][ 11 ]]
+  [[ signed char*->long long ][ !!! *3* !!! ][ 64 ][ 11 ][ 11 ]]
+  [[ signed char*->unsigned int ][ !!! *3* !!! ][ 60 ][ 10 ][ 10 ]]
+  [[ signed char*->unsigned short ][ !!! *3* !!! ][ 59 ][ 10 ][ 10 ]]
+  [[ signed char*->unsigned long int ][ !!! *2* !!! ][ 62 ][ 11 ][ 10 ]]
+  [[ signed char*->unsigned long long ][ !!! *3* !!! ][ 66 ][ 11 ][ 10 ]]
+  [[ signed char*->float ][ 51 ][ 86 ][ 32 ][ !!! *22* !!! ]]
+  [[ signed char*->double ][ 55 ][ 87 ][ 32 ][ !!! *22* !!! ]]
+  [[ signed char*->long double ][ 55 ][ 86 ][ 32 ][ !!! *24* !!! ]]
+  [[ signed char*->array<char, 50> ][ !!! *<1* !!! ][ 64 ][ 10 ][ 8 ]]
+  [[ signed char*->string ][ !!! *1* !!! ][ 62 ][ 12 ][ --- ]]
+  [[ signed char*->container::string ][ !!! *1* !!! ][ 66 ][ 15 ][ --- ]]
+  [[ iterator_range<char*>->char ][ !!! *<1* !!! ][ 53 ][ 5 ][ 5 ]]
+  [[ iterator_range<char*>->signed char ][ !!! *<1* !!! ][ 55 ][ 5 ][ 7 ]]
+  [[ iterator_range<char*>->unsigned char ][ !!! *<1* !!! ][ 57 ][ 5 ][ 7 ]]
+  [[ iterator_range<char*>->int ][ !!! *3* !!! ][ 67 ][ 15 ][ 11 ]]
+  [[ iterator_range<char*>->short ][ !!! *3* !!! ][ 96 ][ 37 ][ 27 ]]
+  [[ iterator_range<char*>->long int ][ !!! *7* !!! ][ 166 ][ 37 ][ 27 ]]
+  [[ iterator_range<char*>->long long ][ !!! *7* !!! ][ 150 ][ 37 ][ 26 ]]
+  [[ iterator_range<char*>->unsigned int ][ !!! *7* !!! ][ 158 ][ 34 ][ 26 ]]
+  [[ iterator_range<char*>->unsigned short ][ !!! *7* !!! ][ 170 ][ 36 ][ 26 ]]
+  [[ iterator_range<char*>->unsigned long int ][ !!! *7* !!! ][ 154 ][ 35 ][ 26 ]]
+  [[ iterator_range<char*>->unsigned long long ][ !!! *7* !!! ][ 158 ][ 36 ][ 26 ]]
+  [[ iterator_range<char*>->float ][ 122 ][ 233 ][ 100 ][ !!! *54* !!! ]]
+  [[ iterator_range<char*>->double ][ 134 ][ 245 ][ 97 ][ !!! *54* !!! ]]
+  [[ iterator_range<char*>->long double ][ 127 ][ 238 ][ 98 ][ !!! *59* !!! ]]
+  [[ iterator_range<char*>->array<char, 50> ][ !!! *<1* !!! ][ 159 ][ 42 ][ 21 ]]
+  [[ iterator_range<char*>->string ][ !!! *2* !!! ][ 165 ][ 50 ][ --- ]]
+  [[ iterator_range<char*>->container::string ][ !!! *1* !!! ][ 186 ][ 58 ][ --- ]]
+  [[ std::string_view->char ][ !!! *<1* !!! ][ 130 ][ 12 ][ 14 ]]
+  [[ std::string_view->signed char ][ !!! *<1* !!! ][ 128 ][ 12 ][ 18 ]]
+  [[ std::string_view->unsigned char ][ !!! *<1* !!! ][ 134 ][ 12 ][ 17 ]]
+  [[ std::string_view->int ][ !!! *7* !!! ][ 153 ][ 31 ][ 27 ]]
+  [[ std::string_view->short ][ !!! *7* !!! ][ 148 ][ 29 ][ 26 ]]
+  [[ std::string_view->long int ][ !!! *7* !!! ][ 150 ][ 28 ][ 26 ]]
+  [[ std::string_view->long long ][ !!! *7* !!! ][ 116 ][ 11 ][ 10 ]]
+  [[ std::string_view->unsigned int ][ !!! *2* !!! ][ 57 ][ 10 ][ 10 ]]
+  [[ std::string_view->unsigned short ][ !!! *3* !!! ][ 57 ][ 10 ][ 10 ]]
+  [[ std::string_view->unsigned long int ][ !!! *2* !!! ][ 66 ][ 11 ][ 10 ]]
+  [[ std::string_view->unsigned long long ][ !!! *2* !!! ][ 61 ][ 11 ][ 10 ]]
+  [[ std::string_view->float ][ 52 ][ 90 ][ 31 ][ !!! *22* !!! ]]
+  [[ std::string_view->double ][ 56 ][ 92 ][ 31 ][ !!! *22* !!! ]]
+  [[ std::string_view->long double ][ 56 ][ 95 ][ 32 ][ !!! *24* !!! ]]
+  [[ std::string_view->array<char, 50> ][ !!! *<1* !!! ][ 65 ][ 10 ][ 8 ]]
+  [[ std::string_view->string ][ !!! *1* !!! ][ 60 ][ 12 ][ --- ]]
+  [[ std::string_view->container::string ][ !!! *2* !!! ][ 67 ][ 14 ][ --- ]]
+  [[ array<char, 50>->char ][ !!! *<1* !!! ][ 53 ][ 5 ][ 6 ]]
+  [[ array<char, 50>->signed char ][ !!! *<1* !!! ][ 54 ][ 5 ][ 7 ]]
+  [[ array<char, 50>->unsigned char ][ !!! *<1* !!! ][ 53 ][ 5 ][ 7 ]]
+  [[ array<char, 50>->int ][ !!! *3* !!! ][ 63 ][ 12 ][ 11 ]]
+  [[ array<char, 50>->short ][ !!! *3* !!! ][ 62 ][ 12 ][ 11 ]]
+  [[ array<char, 50>->long int ][ !!! *3* !!! ][ 63 ][ 11 ][ 11 ]]
+  [[ array<char, 50>->long long ][ !!! *3* !!! ][ 60 ][ 11 ][ 11 ]]
+  [[ array<char, 50>->unsigned int ][ !!! *3* !!! ][ 57 ][ 10 ][ 11 ]]
+  [[ array<char, 50>->unsigned short ][ !!! *3* !!! ][ 65 ][ 11 ][ 11 ]]
+  [[ array<char, 50>->unsigned long int ][ !!! *3* !!! ][ 69 ][ 11 ][ 11 ]]
+  [[ array<char, 50>->unsigned long long ][ !!! *3* !!! ][ 68 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->float ][ 54 ][ 82 ][ 32 ][ !!! *22* !!! ]]
+  [[ array<char, 50>->double ][ 57 ][ 93 ][ 32 ][ !!! *22* !!! ]]
+  [[ array<char, 50>->long double ][ 53 ][ 85 ][ 32 ][ !!! *23* !!! ]]
+  [[ array<char, 50>->array<char, 50> ][ !!! *<1* !!! ][ 60 ][ 10 ][ 8 ]]
+  [[ array<char, 50>->string ][ !!! *1* !!! ][ 61 ][ 11 ][ --- ]]
+  [[ array<char, 50>->container::string ][ !!! *1* !!! ][ 62 ][ 15 ][ --- ]]
+  [[ int->int ][ !!! *<1* !!! ][ 65 ][ 15 ][ --- ]]
+  [[ float->double ][ !!! *<1* !!! ][ 138 ][ 68 ][ --- ]]
+  [[ char->signed char ][ !!! *<1* !!! ][ 53 ][ 5 ][ --- ]]
+]
+[endsect]
+
+[section GNU C++ version 10.5.0]
+[table:id Performance Table ( GNU C++ version 10.5.0)
+[[From->To] [lexical_cast] [std::stringstream with construction] [std::stringstream without construction][scanf/printf]]
+  [[ string->char ][ !!! *<1* !!! ][ 64 ][ 5 ][ 5 ]]
+  [[ string->signed char ][ !!! *<1* !!! ][ 51 ][ 5 ][ 7 ]]
+  [[ string->unsigned char ][ !!! *<1* !!! ][ 53 ][ 5 ][ 6 ]]
+  [[ string->int ][ !!! *3* !!! ][ 56 ][ 11 ][ 10 ]]
+  [[ string->short ][ !!! *3* !!! ][ 56 ][ 12 ][ 10 ]]
+  [[ string->long int ][ !!! *3* !!! ][ 58 ][ 13 ][ 10 ]]
+  [[ string->long long ][ !!! *3* !!! ][ 56 ][ 13 ][ 10 ]]
+  [[ string->unsigned int ][ !!! *3* !!! ][ 60 ][ 10 ][ 10 ]]
+  [[ string->unsigned short ][ !!! *3* !!! ][ 58 ][ 10 ][ 10 ]]
+  [[ string->unsigned long int ][ !!! *3* !!! ][ 59 ][ 12 ][ 10 ]]
+  [[ string->unsigned long long ][ !!! *3* !!! ][ 53 ][ 11 ][ 10 ]]
+  [[ string->float ][ 49 ][ 81 ][ 34 ][ !!! *21* !!! ]]
+  [[ string->double ][ 45 ][ 75 ][ 28 ][ !!! *21* !!! ]]
+  [[ string->long double ][ 46 ][ 76 ][ 30 ][ !!! *25* !!! ]]
+  [[ string->array<char, 50> ][ !!! *<1* !!! ][ 55 ][ 10 ][ 10 ]]
+  [[ string->string ][ !!! *1* !!! ][ 54 ][ 11 ][ --- ]]
+  [[ string->container::string ][ !!! *<1* !!! ][ 57 ][ 11 ][ --- ]]
+  [[ string->char ][ !!! *<1* !!! ][ 51 ][ 9 ][ 7 ]]
+  [[ string->signed char ][ !!! *<1* !!! ][ 51 ][ 10 ][ 10 ]]
+  [[ string->unsigned char ][ !!! *<1* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ int->string ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ short->string ][ !!! *3* !!! ][ 55 ][ 13 ][ 10 ]]
+  [[ long int->string ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ long long->string ][ !!! *3* !!! ][ 56 ][ 12 ][ 10 ]]
+  [[ unsigned int->string ][ !!! *3* !!! ][ 54 ][ 12 ][ 10 ]]
+  [[ unsigned short->string ][ !!! *3* !!! ][ 54 ][ 12 ][ 10 ]]
+  [[ unsigned long int->string ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ unsigned long long->string ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ float->string ][ 26 ][ 96 ][ 46 ][ !!! *25* !!! ]]
+  [[ double->string ][ 33 ][ 94 ][ 46 ][ !!! *23* !!! ]]
+  [[ long double->string ][ 44 ][ 96 ][ 52 ][ !!! *26* !!! ]]
+  [[ char*->char ][ !!! *<1* !!! ][ 48 ][ 5 ][ 5 ]]
+  [[ char*->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ char*->unsigned char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 6 ]]
+  [[ char*->int ][ !!! *3* !!! ][ 57 ][ 12 ][ 10 ]]
+  [[ char*->short ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ char*->long int ][ !!! *3* !!! ][ 59 ][ 11 ][ 10 ]]
+  [[ char*->long long ][ !!! *4* !!! ][ 61 ][ 11 ][ 10 ]]
+  [[ char*->unsigned int ][ !!! *3* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ char*->unsigned short ][ !!! *3* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ char*->unsigned long int ][ !!! *3* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ char*->unsigned long long ][ !!! *3* !!! ][ 55 ][ 11 ][ 10 ]]
+  [[ char*->float ][ 46 ][ 78 ][ 39 ][ !!! *21* !!! ]]
+  [[ char*->double ][ 43 ][ 73 ][ 28 ][ !!! *21* !!! ]]
+  [[ char*->long double ][ 46 ][ 74 ][ 30 ][ !!! *23* !!! ]]
+  [[ char*->array<char, 50> ][ !!! *<1* !!! ][ 52 ][ 10 ][ 8 ]]
+  [[ char*->string ][ !!! *1* !!! ][ 58 ][ 11 ][ --- ]]
+  [[ char*->container::string ][ !!! *<1* !!! ][ 64 ][ 11 ][ --- ]]
+  [[ unsigned char*->char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 5 ]]
+  [[ unsigned char*->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ unsigned char*->unsigned char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ unsigned char*->int ][ !!! *3* !!! ][ 55 ][ 12 ][ 12 ]]
+  [[ unsigned char*->short ][ !!! *4* !!! ][ 59 ][ 11 ][ 10 ]]
+  [[ unsigned char*->long int ][ !!! *3* !!! ][ 56 ][ 12 ][ 10 ]]
+  [[ unsigned char*->long long ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ unsigned char*->unsigned int ][ !!! *3* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ unsigned char*->unsigned short ][ !!! *3* !!! ][ 54 ][ 10 ][ 10 ]]
+  [[ unsigned char*->unsigned long int ][ !!! *3* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ unsigned char*->unsigned long long ][ !!! *3* !!! ][ 55 ][ 11 ][ 10 ]]
+  [[ unsigned char*->float ][ 100 ][ 143 ][ 33 ][ !!! *21* !!! ]]
+  [[ unsigned char*->double ][ 44 ][ 73 ][ 28 ][ !!! *22* !!! ]]
+  [[ unsigned char*->long double ][ 46 ][ 75 ][ 30 ][ !!! *23* !!! ]]
+  [[ unsigned char*->array<char, 50> ][ !!! *<1* !!! ][ 53 ][ 11 ][ 8 ]]
+  [[ unsigned char*->string ][ !!! *1* !!! ][ 58 ][ 11 ][ --- ]]
+  [[ unsigned char*->container::string ][ !!! *<1* !!! ][ 59 ][ 11 ][ --- ]]
+  [[ signed char*->char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 5 ]]
+  [[ signed char*->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ signed char*->unsigned char ][ !!! *<1* !!! ][ 51 ][ 5 ][ 6 ]]
+  [[ signed char*->int ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ signed char*->short ][ !!! *4* !!! ][ 56 ][ 12 ][ 10 ]]
+  [[ signed char*->long int ][ !!! *4* !!! ][ 56 ][ 11 ][ 10 ]]
+  [[ signed char*->long long ][ !!! *3* !!! ][ 55 ][ 11 ][ 10 ]]
+  [[ signed char*->unsigned int ][ !!! *3* !!! ][ 60 ][ 10 ][ 10 ]]
+  [[ signed char*->unsigned short ][ !!! *3* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ signed char*->unsigned long int ][ !!! *3* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ signed char*->unsigned long long ][ !!! *6* !!! ][ 58 ][ 11 ][ 10 ]]
+  [[ signed char*->float ][ 47 ][ 76 ][ 32 ][ !!! *21* !!! ]]
+  [[ signed char*->double ][ 44 ][ 73 ][ 29 ][ !!! *21* !!! ]]
+  [[ signed char*->long double ][ 45 ][ 74 ][ 31 ][ !!! *24* !!! ]]
+  [[ signed char*->array<char, 50> ][ !!! *<1* !!! ][ 52 ][ 11 ][ 8 ]]
+  [[ signed char*->string ][ !!! *1* !!! ][ 58 ][ 11 ][ --- ]]
+  [[ signed char*->container::string ][ !!! *<1* !!! ][ 59 ][ 11 ][ --- ]]
+  [[ iterator_range<char*>->char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 5 ]]
+  [[ iterator_range<char*>->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ iterator_range<char*>->unsigned char ][ !!! *<1* !!! ][ 53 ][ 5 ][ 6 ]]
+  [[ iterator_range<char*>->int ][ !!! *3* !!! ][ 58 ][ 15 ][ 10 ]]
+  [[ iterator_range<char*>->short ][ !!! *3* !!! ][ 59 ][ 16 ][ 10 ]]
+  [[ iterator_range<char*>->long int ][ !!! *3* !!! ][ 58 ][ 15 ][ 10 ]]
+  [[ iterator_range<char*>->long long ][ !!! *3* !!! ][ 59 ][ 15 ][ 10 ]]
+  [[ iterator_range<char*>->unsigned int ][ !!! *3* !!! ][ 56 ][ 14 ][ 10 ]]
+  [[ iterator_range<char*>->unsigned short ][ !!! *3* !!! ][ 61 ][ 14 ][ 10 ]]
+  [[ iterator_range<char*>->unsigned long int ][ !!! *3* !!! ][ 58 ][ 14 ][ 10 ]]
+  [[ iterator_range<char*>->unsigned long long ][ !!! *3* !!! ][ 71 ][ 36 ][ 25 ]]
+  [[ iterator_range<char*>->float ][ 116 ][ 93 ][ 39 ][ !!! *21* !!! ]]
+  [[ iterator_range<char*>->double ][ 43 ][ 81 ][ 34 ][ !!! *21* !!! ]]
+  [[ iterator_range<char*>->long double ][ 44 ][ 87 ][ 37 ][ !!! *24* !!! ]]
+  [[ iterator_range<char*>->array<char, 50> ][ !!! *<1* !!! ][ 58 ][ 17 ][ 8 ]]
+  [[ iterator_range<char*>->string ][ !!! *1* !!! ][ 63 ][ 20 ][ --- ]]
+  [[ iterator_range<char*>->container::string ][ !!! *<1* !!! ][ 65 ][ 20 ][ --- ]]
+  [[ std::string_view->char ][ !!! *<1* !!! ][ 46 ][ 5 ][ 5 ]]
+  [[ std::string_view->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ std::string_view->unsigned char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 7 ]]
+  [[ std::string_view->int ][ !!! *4* !!! ][ 56 ][ 11 ][ 10 ]]
+  [[ std::string_view->short ][ !!! *3* !!! ][ 55 ][ 12 ][ 10 ]]
+  [[ std::string_view->long int ][ !!! *4* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ std::string_view->long long ][ !!! *4* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ std::string_view->unsigned int ][ !!! *3* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ std::string_view->unsigned short ][ !!! *3* !!! ][ 54 ][ 10 ][ 10 ]]
+  [[ std::string_view->unsigned long int ][ !!! *3* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ std::string_view->unsigned long long ][ !!! *3* !!! ][ 55 ][ 11 ][ 10 ]]
+  [[ std::string_view->float ][ 47 ][ 76 ][ 32 ][ !!! *22* !!! ]]
+  [[ std::string_view->double ][ 43 ][ 74 ][ 28 ][ !!! *21* !!! ]]
+  [[ std::string_view->long double ][ 46 ][ 75 ][ 31 ][ !!! *24* !!! ]]
+  [[ std::string_view->array<char, 50> ][ !!! *1* !!! ][ 51 ][ 10 ][ 8 ]]
+  [[ std::string_view->string ][ !!! *2* !!! ][ 53 ][ 10 ][ --- ]]
+  [[ std::string_view->container::string ][ !!! *1* !!! ][ 56 ][ 11 ][ --- ]]
+  [[ array<char, 50>->char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 5 ]]
+  [[ array<char, 50>->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ 6 ]]
+  [[ array<char, 50>->unsigned char ][ !!! *<1* !!! ][ 49 ][ 5 ][ 6 ]]
+  [[ array<char, 50>->int ][ !!! *3* !!! ][ 54 ][ 12 ][ 10 ]]
+  [[ array<char, 50>->short ][ !!! *3* !!! ][ 61 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->long int ][ !!! *3* !!! ][ 55 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->long long ][ !!! *3* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->unsigned int ][ !!! *3* !!! ][ 53 ][ 10 ][ 10 ]]
+  [[ array<char, 50>->unsigned short ][ !!! *3* !!! ][ 52 ][ 10 ][ 10 ]]
+  [[ array<char, 50>->unsigned long int ][ !!! *3* !!! ][ 62 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->unsigned long long ][ !!! *3* !!! ][ 54 ][ 11 ][ 10 ]]
+  [[ array<char, 50>->float ][ 45 ][ 75 ][ 35 ][ !!! *24* !!! ]]
+  [[ array<char, 50>->double ][ 44 ][ 75 ][ 28 ][ !!! *21* !!! ]]
+  [[ array<char, 50>->long double ][ 45 ][ 76 ][ 29 ][ !!! *24* !!! ]]
+  [[ array<char, 50>->array<char, 50> ][ !!! *<1* !!! ][ 53 ][ 10 ][ 8 ]]
+  [[ array<char, 50>->string ][ !!! *1* !!! ][ 54 ][ 11 ][ --- ]]
+  [[ array<char, 50>->container::string ][ !!! *1* !!! ][ 56 ][ 12 ][ --- ]]
+  [[ int->int ][ !!! *<1* !!! ][ 58 ][ 13 ][ --- ]]
+  [[ float->double ][ !!! *<1* !!! ][ 116 ][ 63 ][ --- ]]
+  [[ char->signed char ][ !!! *<1* !!! ][ 47 ][ 5 ][ --- ]]
+]
+[endsect]
+
+
+
+
+[/ END of section, generated by performance measuring program ]
+[endsect]
+

example/args_to_numbers.cpp

@@ -0,0 +1,36 @@
+// Copyright Antony Polukhin, 2013-2026.
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See the accompanying file LICENSE_1_0.txt
+// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+//[lexical_cast_args_example
+//`The following example treats command line arguments as a sequence of numeric data
+
+#include <vector>
+
+#include <boost/lexical_cast.hpp>
+
+int main(int /*argc*/, char * argv[])
+{
+    using boost::lexical_cast;
+    using boost::bad_lexical_cast;
+
+    std::vector<short> args;
+
+    while (*++argv)
+    {
+        try
+        {
+            args.push_back(lexical_cast<short>(*argv));
+        }
+        catch(const bad_lexical_cast &)
+        {
+            args.push_back(0);
+        }
+    }
+
+    // ...
+}
+
+//] [/lexical_cast_args_example]

example/generic_stringize.cpp

@@ -0,0 +1,72 @@
+// Copyright Antony Polukhin, 2013-2026.
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See the accompanying file LICENSE_1_0.txt
+// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+#include <boost/config.hpp>
+#ifdef BOOST_MSVC
+# pragma warning(disable: 4512) // generic_stringize.cpp(37) : warning C4512: 'stringize_functor' : assignment operator could not be generated
+#endif
+
+//[lexical_cast_stringize
+/*`
+    In this example we'll make a `stringize` method that accepts a sequence, converts
+    each element of the sequence into string and appends that string to the result.
+
+    Example is based on the example from the Boost C++ Application Development Cookbook
+    by Antony Polukhin, ISBN 9781849514880. Russian translation: [@https://dmkpress.com/catalog/computer/programming/c/978-5-97060-868-5/ ISBN: 9785970608685].
+
+    Step 1: Making a functor that converts any type to a string and remembers result:
+*/
+
+#include <string>
+
+#include <boost/fusion/include/for_each.hpp>
+#include <boost/fusion/adapted/std_tuple.hpp>
+#include <boost/fusion/adapted/std_pair.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+struct stringize_functor {
+private:
+    std::string& result;
+
+public:
+    explicit stringize_functor(std::string& res)
+        : result(res)
+    {}
+
+    template <class T>
+    void operator()(const T& v) const {
+        result += boost::lexical_cast<std::string>(v);
+    }
+};
+
+//` Step 2: Applying `stringize_functor` to each element in sequence:
+template <class Sequence>
+std::string stringize(const Sequence& seq) {
+    std::string result;
+    boost::fusion::for_each(seq, stringize_functor(result));
+    return result;
+}
+
+//` Step 3: Using the `stringize` with different types:
+int main() {
+    std::tuple<char, int, char, int> decim('-', 10, 'e', 5);
+    if (stringize(decim) != "-10e5") {
+        return 1;
+    }
+
+    std::pair<int, std::string> value_and_type(270, "Kelvin");
+    if (stringize(value_and_type) != "270Kelvin") {
+        return 2;
+    }
+
+    return 0;
+}
+
+//] [/lexical_cast_stringize]
+
+
+

example/small_examples.cpp

@@ -0,0 +1,59 @@
+// Copyright Antony Polukhin, 2013-2026.
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See the accompanying file LICENSE_1_0.txt
+// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+#include <array>
+#include <string>
+#include <string.h>
+#include <cstdio>
+
+#include <boost/lexical_cast.hpp>
+
+#ifdef BOOST_MSVC
+#  pragma warning(disable: 4996) // `strerror` is not safe
+#endif
+
+//[lexical_cast_log_errno
+//`The following example uses numeric data in a string expression:
+
+void log_message(const std::string &);
+
+void log_errno(int yoko)
+{
+    log_message("Error " + boost::lexical_cast<std::string>(yoko) + ": " + strerror(yoko));
+}
+
+//] [/lexical_cast_log_errno]
+
+
+//[lexical_cast_fixed_buffer
+//`The following example converts some number and puts it to file:
+
+void number_to_file(int number, std::FILE* file)
+{
+    using buf_t = std::array<char, 50>;
+    buf_t buffer = boost::lexical_cast<buf_t>(number); // No dynamic memory allocation
+    std::fputs(buffer.data(), file);
+}
+
+//] [/lexical_cast_fixed_buffer]
+
+//[lexical_cast_substring_conversion
+//`The following example takes part of the string and converts it to `int`:
+
+int convert_strings_part(const std::string& s, std::size_t pos, std::size_t n)
+{
+    return boost::lexical_cast<int>(s.data() + pos, n);
+}
+
+//] [/lexical_cast_substring_conversion]
+
+void log_message(const std::string &) {}
+
+int main()
+{
+    return 0;
+}
+

example/variant_to_long_double.cpp

@@ -0,0 +1,46 @@
+// Copyright Antony Polukhin, 2013-2026.
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See the accompanying file LICENSE_1_0.txt
+// or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
+
+
+//[lexical_cast_variant_to_long_double
+/*`
+    In this example we'll make a `to_long_double` method that converts value of the Boost.Variant to `long double`.
+*/
+
+#ifdef BOOST_USE_MODULES
+#include <compare>
+#endif
+#include <boost/variant.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+struct to_long_double_functor: boost::static_visitor<long double> {
+    template <class T>
+    long double operator()(const T& v) const {
+        // Lexical cast has many optimizations including optimizations for situations that usually
+        // occur in generic programming, like std::string to std::string or arithmetic type to arithmetic type conversion.
+        return boost::lexical_cast<long double>(v);
+    }
+};
+
+// Throws `boost::bad_lexical_cast` if value of the variant is not convertible to `long double`
+template <class Variant>
+long double to_long_double(const Variant& v) {
+    return boost::apply_visitor(to_long_double_functor(), v);
+}
+
+int main() {
+    boost::variant<char, int, std::string> v1('0'), v2("10.0001"), v3(1);
+
+    const long double sum = to_long_double(v1) + to_long_double(v2) + to_long_double(v3);
+    if (11 < sum  && sum < 11.1) {
+        return 0;  // OK, as expected
+    };
+
+    return 1;      // FAIL
+}
+
+//] [/lexical_cast_variant_to_long_double]

include/boost/cast.hpp

@@ -1,107 +0,0 @@
-//  boost cast.hpp header file  ----------------------------------------------//
-
-//  (C) Copyright Kevlin Henney and Dave Abrahams 1999.
-//  Distributed under the Boost
-//  Software License, Version 1.0. (See accompanying file
-//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-//  See http://www.boost.org/libs/conversion for Documentation.
-
-//  Revision History
-//  23 JUn 05  numeric_cast removed and redirected to the new verion (Fernando Cacciola)
-//  02 Apr 01  Removed BOOST_NO_LIMITS workarounds and included
-//             <boost/limits.hpp> instead (the workaround did not
-//             actually compile when BOOST_NO_LIMITS was defined in
-//             any case, so we loose nothing). (John Maddock)
-//  21 Jan 01  Undid a bug I introduced yesterday. numeric_cast<> never
-//             worked with stock GCC; trying to get it to do that broke
-//             vc-stlport.
-//  20 Jan 01  Moved BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS to config.hpp.
-//             Removed unused BOOST_EXPLICIT_TARGET macro. Moved
-//             boost::detail::type to boost/type.hpp. Made it compile with
-//             stock gcc again (Dave Abrahams)
-//  29 Nov 00  Remove nested namespace cast, cleanup spacing before Formal
-//             Review (Beman Dawes)
-//  19 Oct 00  Fix numeric_cast for floating-point types (Dave Abrahams)
-//  15 Jul 00  Suppress numeric_cast warnings for GCC, Borland and MSVC
-//             (Dave Abrahams)
-//  30 Jun 00  More MSVC6 wordarounds.  See comments below.  (Dave Abrahams)
-//  28 Jun 00  Removed implicit_cast<>.  See comment below. (Beman Dawes)
-//  27 Jun 00  More MSVC6 workarounds
-//  15 Jun 00  Add workarounds for MSVC6
-//   2 Feb 00  Remove bad_numeric_cast ";" syntax error (Doncho Angelov)
-//  26 Jan 00  Add missing throw() to bad_numeric_cast::what(0 (Adam Levar)
-//  29 Dec 99  Change using declarations so usages in other namespaces work
-//             correctly (Dave Abrahams)
-//  23 Sep 99  Change polymorphic_downcast assert to also detect M.I. errors
-//             as suggested Darin Adler and improved by Valentin Bonnard.
-//   2 Sep 99  Remove controversial asserts, simplify, rename.
-//  30 Aug 99  Move to cast.hpp, replace value_cast with numeric_cast,
-//             place in nested namespace.
-//   3 Aug 99  Initial version
-
-#ifndef BOOST_CAST_HPP
-#define BOOST_CAST_HPP
-
-# include <boost/config.hpp>
-# include <boost/assert.hpp>
-# include <typeinfo>
-# include <boost/type.hpp>
-# include <boost/limits.hpp>
-# include <boost/detail/select_type.hpp>
-
-//  It has been demonstrated numerous times that MSVC 6.0 fails silently at link
-//  time if you use a template function which has template parameters that don't
-//  appear in the function's argument list.
-//
-//  TODO: Add this to config.hpp?
-# if defined(BOOST_MSVC) && BOOST_MSVC < 1300
-#  define BOOST_EXPLICIT_DEFAULT_TARGET , ::boost::type<Target>* = 0
-# else
-#  define BOOST_EXPLICIT_DEFAULT_TARGET
-# endif
-
-namespace boost
-{
-//  See the documentation for descriptions of how to choose between
-//  static_cast<>, dynamic_cast<>, polymorphic_cast<> and polymorphic_downcast<>
-
-//  polymorphic_cast  --------------------------------------------------------//
-
-    //  Runtime checked polymorphic downcasts and crosscasts.
-    //  Suggested in The C++ Programming Language, 3rd Ed, Bjarne Stroustrup,
-    //  section 15.8 exercise 1, page 425.
-
-    template <class Target, class Source>
-    inline Target polymorphic_cast(Source* x BOOST_EXPLICIT_DEFAULT_TARGET)
-    {
-        Target tmp = dynamic_cast<Target>(x);
-        if ( tmp == 0 ) throw std::bad_cast();
-        return tmp;
-    }
-
-//  polymorphic_downcast  ----------------------------------------------------//
-
-    //  BOOST_ASSERT() checked polymorphic downcast.  Crosscasts prohibited.
-
-    //  WARNING: Because this cast uses BOOST_ASSERT(), it violates
-    //  the One Definition Rule if used in multiple translation units
-    //  where BOOST_DISABLE_ASSERTS, BOOST_ENABLE_ASSERT_HANDLER
-    //  NDEBUG are defined inconsistently.
-
-    //  Contributed by Dave Abrahams
-
-    template <class Target, class Source>
-    inline Target polymorphic_downcast(Source* x BOOST_EXPLICIT_DEFAULT_TARGET)
-    {
-        BOOST_ASSERT( dynamic_cast<Target>(x) == x );  // detect logic error
-        return static_cast<Target>(x);
-    }
-
-#  undef BOOST_EXPLICIT_DEFAULT_TARGET
-
-} // namespace boost
-
-# include <boost/numeric/conversion/cast.hpp>
-
-#endif  // BOOST_CAST_HPP

include/boost/detail/basic_pointerbuf.hpp

@@ -0,0 +1,134 @@
+//-----------------------------------------------------------------------------
+// boost detail/templated_streams.hpp header file
+// See http://www.boost.org for updates, documentation, and revision history.
+//-----------------------------------------------------------------------------
+//
+// Copyright (c) 2013 John Maddock, Antony Polukhin
+// 
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_DETAIL_BASIC_POINTERBUF_HPP
+#define BOOST_DETAIL_BASIC_POINTERBUF_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER)
+# pragma once
+#endif
+
+#include <boost/config.hpp>
+
+#include <streambuf>
+
+namespace boost { namespace detail {
+
+//
+// class basic_pointerbuf:
+// acts as a stream buffer which wraps around a pair of pointers:
+//
+template <class charT, class BufferT >
+class basic_pointerbuf : public BufferT {
+protected:
+   typedef BufferT base_type;
+   typedef basic_pointerbuf<charT, BufferT> this_type;
+   typedef typename base_type::int_type int_type;
+   typedef typename base_type::char_type char_type;
+   typedef typename base_type::pos_type pos_type;
+   typedef ::std::streamsize streamsize;
+   typedef typename base_type::off_type off_type;
+
+public:
+   basic_pointerbuf() : base_type() { this_type::setbuf(0, 0); }
+   const charT* getnext() { return this->gptr(); }
+
+    using base_type::pptr;
+    using base_type::pbase;
+
+protected:
+   // VC mistakenly assumes that `setbuf` and other functions are not referenced.
+   // Marking those functions with `inline` suppresses the warnings.
+   // There must be no harm from marking virtual functions as inline: inline virtual
+   // call can be inlined ONLY when the compiler knows the "exact class".
+   inline base_type* setbuf(char_type* s, streamsize n) BOOST_OVERRIDE;
+   inline typename this_type::pos_type seekpos(pos_type sp, ::std::ios_base::openmode which) BOOST_OVERRIDE;
+   inline typename this_type::pos_type seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which) BOOST_OVERRIDE;
+
+private:
+   basic_pointerbuf& operator=(const basic_pointerbuf&);
+   basic_pointerbuf(const basic_pointerbuf&);
+};
+
+template<class charT, class BufferT>
+BufferT*
+basic_pointerbuf<charT, BufferT>::setbuf(char_type* s, streamsize n)
+{
+   this->setg(s, s, s + n);
+   return this;
+}
+
+template<class charT, class BufferT>
+typename basic_pointerbuf<charT, BufferT>::pos_type
+basic_pointerbuf<charT, BufferT>::seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which)
+{
+   typedef ::std::ios_base::seekdir cast_type;
+
+   if(which & ::std::ios_base::out)
+      return pos_type(off_type(-1));
+   std::ptrdiff_t size = this->egptr() - this->eback();
+   std::ptrdiff_t pos = this->gptr() - this->eback();
+   charT* g = this->eback();
+   switch(static_cast<cast_type>(way))
+   {
+   case ::std::ios_base::beg:
+      if((off < 0) || (off > size))
+         return pos_type(off_type(-1));
+      else
+         this->setg(g, g + off, g + size);
+      break;
+   case ::std::ios_base::end:
+      if((off < 0) || (off > size))
+         return pos_type(off_type(-1));
+      else
+         this->setg(g, g + size - off, g + size);
+      break;
+   case ::std::ios_base::cur:
+   {
+      std::ptrdiff_t newpos = static_cast<std::ptrdiff_t>(pos + off);
+      if((newpos < 0) || (newpos > size))
+         return pos_type(off_type(-1));
+      else
+         this->setg(g, g + newpos, g + size);
+      break;
+   }
+   default: ;
+   }
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4244)
+#endif
+   return static_cast<pos_type>(this->gptr() - this->eback());
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+}
+
+template<class charT, class BufferT>
+typename basic_pointerbuf<charT, BufferT>::pos_type
+basic_pointerbuf<charT, BufferT>::seekpos(pos_type sp, ::std::ios_base::openmode which)
+{
+   if(which & ::std::ios_base::out)
+      return pos_type(off_type(-1));
+   off_type size = static_cast<off_type>(this->egptr() - this->eback());
+   charT* g = this->eback();
+   if(off_type(sp) <= size)
+   {
+      this->setg(g, g + off_type(sp), g + size);
+   }
+   return pos_type(off_type(-1));
+}
+
+}} // namespace boost::detail
+
+#endif // BOOST_DETAIL_BASIC_POINTERBUF_HPP

include/boost/detail/lcast_precision.hpp

@@ -1,184 +0,0 @@
-// Copyright Alexander Nasonov & Paul A. Bristow 2006.
-
-// Use, modification and distribution are subject to the
-// Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt
-// or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-#ifndef BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
-#define BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
-
-#include <climits>
-#include <ios>
-#include <limits>
-
-#include <boost/config.hpp>
-#include <boost/integer_traits.hpp>
-
-#ifndef BOOST_NO_IS_ABSTRACT
-// Fix for SF:1358600 - lexical_cast & pure virtual functions & VC 8 STL
-#include <boost/mpl/if.hpp>
-#include <boost/type_traits/is_abstract.hpp>
-#endif
-
-#if defined(BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS) || \
-  (defined(BOOST_MSVC) && (BOOST_MSVC<1310))
-
-#define BOOST_LCAST_NO_COMPILE_TIME_PRECISION
-#endif
-
-#ifdef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
-#include <boost/assert.hpp>
-#else
-#include <boost/static_assert.hpp>
-#endif
-
-namespace boost { namespace detail {
-
-class lcast_abstract_stub {};
-
-#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
-// Calculate an argument to pass to std::ios_base::precision from
-// lexical_cast. See alternative implementation for broken standard
-// libraries in lcast_get_precision below. Keep them in sync, please.
-template<class T>
-struct lcast_precision
-{
-#ifdef BOOST_NO_IS_ABSTRACT
-    typedef std::numeric_limits<T> limits; // No fix for SF:1358600.
-#else
-    typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
-        boost::is_abstract<T>
-      , std::numeric_limits<lcast_abstract_stub>
-      , std::numeric_limits<T>
-      >::type limits;
-#endif
-
-    BOOST_STATIC_CONSTANT(bool, use_default_precision =
-            !limits::is_specialized || limits::is_exact
-        );
-
-    BOOST_STATIC_CONSTANT(bool, is_specialized_bin =
-            !use_default_precision &&
-            limits::radix == 2 && limits::digits > 0
-        );
-
-    BOOST_STATIC_CONSTANT(bool, is_specialized_dec =
-            !use_default_precision &&
-            limits::radix == 10 && limits::digits10 > 0
-        );
-
-    BOOST_STATIC_CONSTANT(std::streamsize, streamsize_max =
-            boost::integer_traits<std::streamsize>::const_max
-        );
-
-    BOOST_STATIC_CONSTANT(unsigned int, precision_dec = limits::digits10 + 1U);
-
-    BOOST_STATIC_ASSERT(!is_specialized_dec ||
-            precision_dec <= streamsize_max + 0UL
-        );
-
-    BOOST_STATIC_CONSTANT(unsigned long, precision_bin =
-            2UL + limits::digits * 30103UL / 100000UL
-        );
-
-    BOOST_STATIC_ASSERT(!is_specialized_bin ||
-            (limits::digits + 0UL < ULONG_MAX / 30103UL &&
-            precision_bin > limits::digits10 + 0UL &&
-            precision_bin <= streamsize_max + 0UL)
-        );
-
-    BOOST_STATIC_CONSTANT(std::streamsize, value =
-            is_specialized_bin ? precision_bin
-                               : is_specialized_dec ? precision_dec : 6
-        );
-};
-#endif
-
-template<class T>
-inline std::streamsize lcast_get_precision(T* = 0)
-{
-#ifndef BOOST_LCAST_NO_COMPILE_TIME_PRECISION
-    return lcast_precision<T>::value;
-#else // Follow lcast_precision algorithm at run-time:
-
-#ifdef BOOST_NO_IS_ABSTRACT
-    typedef std::numeric_limits<T> limits; // No fix for SF:1358600.
-#else
-    typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
-        boost::is_abstract<T>
-      , std::numeric_limits<lcast_abstract_stub>
-      , std::numeric_limits<T>
-      >::type limits;
-#endif
-
-    bool const use_default_precision =
-        !limits::is_specialized || limits::is_exact;
-
-    if(!use_default_precision)
-    { // Includes all built-in floating-point types, float, double ...
-      // and UDT types for which digits (significand bits) is defined (not zero)
-
-        bool const is_specialized_bin =
-            limits::radix == 2 && limits::digits > 0;
-        bool const is_specialized_dec =
-            limits::radix == 10 && limits::digits10 > 0;
-        std::streamsize const streamsize_max =
-            (boost::integer_traits<std::streamsize>::max)();
-
-        if(is_specialized_bin)
-        { // Floating-point types with
-          // limits::digits defined by the specialization.
-
-            unsigned long const digits = limits::digits;
-            unsigned long const precision = 2UL + digits * 30103UL / 100000UL;
-            // unsigned long is selected because it is at least 32-bits
-            // and thus ULONG_MAX / 30103UL is big enough for all types.
-            BOOST_ASSERT(
-                    digits < ULONG_MAX / 30103UL &&
-                    precision > limits::digits10 + 0UL &&
-                    precision <= streamsize_max + 0UL
-                );
-            return precision;
-        }
-        else if(is_specialized_dec)
-        {   // Decimal Floating-point type, most likely a User Defined Type
-            // rather than a real floating-point hardware type.
-            unsigned int const precision = limits::digits10 + 1U;
-            BOOST_ASSERT(precision <= streamsize_max + 0UL);
-            return precision;
-        }
-    }
-
-    // Integral type (for which precision has no effect)
-    // or type T for which limits is NOT specialized,
-    // so assume stream precision remains the default 6 decimal digits.
-    // Warning: if your User-defined Floating-point type T is NOT specialized,
-    // then you may lose accuracy by only using 6 decimal digits.
-    // To avoid this, you need to specialize T with either
-    // radix == 2 and digits == the number of significand bits,
-    // OR
-    // radix = 10 and digits10 == the number of decimal digits.
-
-    return 6;
-#endif
-}
-
-template<class T>
-inline void lcast_set_precision(std::ios_base& stream, T*)
-{
-    stream.precision(lcast_get_precision<T>());
-}
-
-template<class Source, class Target>
-inline void lcast_set_precision(std::ios_base& stream, Source*, Target*)
-{
-    std::streamsize const s = lcast_get_precision((Source*)0);
-    std::streamsize const t = lcast_get_precision((Target*)0);
-    stream.precision(s > t ? s : t);
-}
-
-}}
-
-#endif //  BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
-

include/boost/implicit_cast.hpp

@@ -1,29 +0,0 @@
-// Copyright David Abrahams 2003.
-// Distributed under the Boost Software License, Version 1.0. (See
-// accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-#ifndef IMPLICIT_CAST_DWA200356_HPP
-# define IMPLICIT_CAST_DWA200356_HPP
-
-# include <boost/mpl/identity.hpp>
-
-namespace boost {
-
-// implementation originally suggested by C. Green in
-// http://lists.boost.org/MailArchives/boost/msg00886.php
-
-// The use of identity creates a non-deduced form, so that the
-// explicit template argument must be supplied
-template <typename T>
-inline T implicit_cast (typename mpl::identity<T>::type x) {
-    return x;
-}
-
-// incomplete return type now is here
-//template <typename T>
-//void implicit_cast (...);
-
-} // namespace boost
-
-
-#endif // IMPLICIT_CAST_DWA200356_HPP

include/boost/lexical_cast/bad_lexical_cast.hpp

@@ -0,0 +1,110 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
+#define BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <exception>
+#include <typeinfo>
+#include <boost/throw_exception.hpp>
+#endif
+
+namespace boost
+{
+BOOST_LEXICAL_CAST_BEGIN_MODULE_EXPORT
+    // exception used to indicate runtime lexical_cast failure
+    class BOOST_SYMBOL_VISIBLE bad_lexical_cast :
+    // workaround MSVC bug with std::bad_cast when _HAS_EXCEPTIONS == 0
+#if defined(BOOST_MSVC) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS
+        public std::exception
+#else
+        public std::bad_cast
+#endif
+    {
+    public:
+        bad_lexical_cast() noexcept
+#ifndef BOOST_NO_TYPEID
+           : source(&typeid(void)), target(&typeid(void))
+#endif
+        {}
+
+        const char *what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE {
+            return "bad lexical cast: "
+                   "source type value could not be interpreted as target";
+        }
+
+        bad_lexical_cast(const bad_lexical_cast&) = default;
+        bad_lexical_cast& operator=(const bad_lexical_cast&) = default;
+
+#ifndef BOOST_NO_TYPEID
+    private:
+#ifdef BOOST_NO_STD_TYPEINFO
+        typedef ::type_info type_info_t;
+#else
+        typedef ::std::type_info type_info_t;
+#endif
+    public:
+        bad_lexical_cast(
+                const type_info_t &source_type_arg,
+                const type_info_t &target_type_arg) noexcept
+            : source(&source_type_arg), target(&target_type_arg)
+        {}
+
+        const type_info_t &source_type() const noexcept {
+            return *source;
+        }
+
+        const type_info_t &target_type() const noexcept {
+            return *target;
+        }
+
+    private:
+        const type_info_t *source;
+        const type_info_t *target;
+#endif
+    };
+BOOST_LEXICAL_CAST_END_MODULE_EXPORT
+
+    namespace conversion { namespace detail {
+#ifdef BOOST_NO_TYPEID
+        template <class S, class T>
+        inline void throw_bad_cast() {
+            boost::throw_exception(bad_lexical_cast());
+        }
+#else
+        template <class S, class T>
+        inline void throw_bad_cast() {
+            boost::throw_exception(bad_lexical_cast(typeid(S), typeid(T)));
+        }
+#endif
+    }} // namespace conversion::detail
+
+} // namespace boost
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_BAD_LEXICAL_CAST_HPP

include/boost/lexical_cast/detail/buffer_view.hpp

@@ -0,0 +1,67 @@
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_BUFFER_VIEW_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_BUFFER_VIEW_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <iosfwd>
+#endif
+
+namespace boost { namespace conversion { namespace detail {
+
+    template < typename CharT >
+    struct buffer_view {
+        const CharT* begin;
+        const CharT* end;
+    };
+
+    template < typename CharT >
+    buffer_view<CharT> make_buffer_view(const CharT* begin, const CharT* end) {
+        return buffer_view<CharT>{begin, end};
+    }
+
+    inline buffer_view<char> make_buffer_view(const signed char* begin, const signed char* end) {
+        return buffer_view<char>{
+            reinterpret_cast<const char*>(begin),
+            reinterpret_cast<const char*>(end)
+        };
+    }
+
+    inline buffer_view<char> make_buffer_view(const unsigned char* begin, const unsigned char* end) {
+        return buffer_view<char>{
+            reinterpret_cast<const char*>(begin),
+            reinterpret_cast<const char*>(end)
+        };
+    }
+
+    template< typename CharT, typename Elem, typename Traits >
+    std::basic_ostream<Elem,Traits>& operator<<( 
+                std::basic_ostream<Elem, Traits>& os,
+                buffer_view<CharT> r)
+    {
+        while (r.begin != r.end) {
+          os << r.begin[0];
+          ++r.begin;
+        }
+        return os;
+    }
+
+}}}  // namespace boost::conversion::detail
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_BUFFER_VIEW_HPP
+

include/boost/lexical_cast/detail/config.hpp

@@ -0,0 +1,22 @@
+// Copyright Antony Polukhin, 2021-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_CONFIG_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_CONFIG_HPP
+
+#ifdef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#   define BOOST_LEXICAL_CAST_BEGIN_MODULE_EXPORT export {
+#   define BOOST_LEXICAL_CAST_END_MODULE_EXPORT }
+#else
+#   define BOOST_LEXICAL_CAST_BEGIN_MODULE_EXPORT
+#   define BOOST_LEXICAL_CAST_END_MODULE_EXPORT
+#endif
+
+#if defined(BOOST_USE_MODULES) && !defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+import boost.lexical_cast;
+#endif
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_DETAIL_CONFIG_HPP

include/boost/lexical_cast/detail/converter_lexical.hpp

@@ -0,0 +1,491 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+#include <array>
+#include <cstddef>
+#include <string>
+#include <type_traits>
+#include <boost/limits.hpp>
+
+#include <array>
+
+#ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
+#include <string_view>
+#endif
+
+#include <boost/container/container_fwd.hpp>
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+#include <boost/lexical_cast/detail/lcast_precision.hpp>
+#include <boost/lexical_cast/detail/widest_char.hpp>
+#include <boost/lexical_cast/detail/is_character.hpp>
+#include <boost/lexical_cast/detail/buffer_view.hpp>
+#include <boost/lexical_cast/detail/converter_lexical_streams.hpp>
+
+namespace boost {
+
+    // Forward declaration
+    template<class T, std::size_t N>
+    class array;
+    template<class IteratorT>
+    class iterator_range;
+
+    // Forward declaration of boost::basic_string_view from Utility
+    template<class Ch, class Tr> class basic_string_view;
+
+    namespace detail // normalize_single_byte_char<Char>
+    {
+        // Converts signed/unsigned char to char
+        template < class Char >
+        struct normalize_single_byte_char
+        {
+            using type = Char;
+        };
+
+        template <>
+        struct normalize_single_byte_char< signed char >
+        {
+            using type = char;
+        };
+
+        template <>
+        struct normalize_single_byte_char< unsigned char >
+        {
+            using type = char;
+        };
+    }
+
+    namespace detail // deduce_character_type_later<T>
+    {
+        // Helper type, meaning that stram character for T must be deduced
+        // at Stage 2 (See deduce_source_char<T> and deduce_target_char<T>)
+        template < class T > struct deduce_character_type_later {};
+    }
+
+    namespace detail // stream_char_common<T>
+    {
+        // Selectors to choose stream character type (common for Source and Target)
+        // Returns one of char, wchar_t, char16_t, char32_t or deduce_character_type_later<T> types
+        // Executed on Stage 1 (See deduce_source_char<T> and deduce_target_char<T>)
+        template < typename Type >
+        struct stream_char_common: public std::conditional<
+            boost::detail::is_character< Type >::value,
+            Type,
+            boost::detail::deduce_character_type_later< Type >
+        > {};
+
+        template < typename Char >
+        struct stream_char_common< Char* >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< Char* >
+        > {};
+
+        template < typename Char >
+        struct stream_char_common< const Char* >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< const Char* >
+        > {};
+
+        template < typename Char >
+        struct stream_char_common< boost::conversion::detail::buffer_view< Char > >
+        {
+            using type = Char;
+        };
+
+        template < typename Char >
+        struct stream_char_common< boost::iterator_range< Char* > >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::iterator_range< Char* > >
+        > {};
+
+        template < typename Char >
+        struct stream_char_common< boost::iterator_range< const Char* > >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::iterator_range< const Char* > >
+        > {};
+
+        template < class Char, class Traits, class Alloc >
+        struct stream_char_common< std::basic_string< Char, Traits, Alloc > >
+        {
+            using type = Char;
+        };
+
+        template < class Char, class Traits, class Alloc >
+        struct stream_char_common< boost::container::basic_string< Char, Traits, Alloc > >
+        {
+            using type = Char;
+        };
+
+        template < typename Char, std::size_t N >
+        struct stream_char_common< boost::array< Char, N > >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::array< Char, N > >
+        > {};
+
+        template < typename Char, std::size_t N >
+        struct stream_char_common< boost::array< const Char, N > >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< boost::array< const Char, N > >
+        > {};
+
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+        template < typename Char, std::size_t N >
+        struct stream_char_common< std::array<Char, N > >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< std::array< Char, N > >
+        > {};
+
+        template < typename Char, std::size_t N >
+        struct stream_char_common< std::array< const Char, N > >: public std::conditional<
+            boost::detail::is_character< Char >::value,
+            Char,
+            boost::detail::deduce_character_type_later< std::array< const Char, N > >
+        > {};
+#endif
+
+#ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
+        template < class Char, class Traits >
+        struct stream_char_common< std::basic_string_view< Char, Traits > >
+        {
+            using type = Char;
+        };
+#endif
+        template < class Char, class Traits >
+        struct stream_char_common< boost::basic_string_view< Char, Traits > >
+        {
+            using type = Char;
+        };
+
+#ifdef BOOST_HAS_INT128
+        template <> struct stream_char_common< boost::int128_type >
+        {
+            using type = char;
+        };
+        template <> struct stream_char_common< boost::uint128_type >
+        {
+            using type = char;
+        };
+#endif
+
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && defined(BOOST_NO_INTRINSIC_WCHAR_T)
+        template <>
+        struct stream_char_common< wchar_t >
+        {
+            using type = char;
+        };
+#endif
+    }
+
+    namespace detail // deduce_source_char_impl<T>
+    {
+        // If type T is `deduce_character_type_later` type, then tries to deduce
+        // character type using streaming metafunctions.
+        // Otherwise supplied type T is a character type, that must be normalized
+        // using normalize_single_byte_char<Char>.
+        // Executed at Stage 2  (See deduce_source_char<T> and deduce_target_char<T>)
+        template < class Char >
+        struct deduce_source_char_impl
+        {
+            typedef typename boost::detail::normalize_single_byte_char< Char >::type type;
+        };
+
+        template < class T >
+        struct deduce_source_char_impl< deduce_character_type_later< T > >
+        {
+            template <class U>
+            static auto left_shift_type(long)
+                -> decltype( std::declval<std::basic_ostream< char >&>() << std::declval<const U&>(), char{});
+
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+            template <class U>
+            static auto left_shift_type(int)
+                -> decltype( std::declval<std::basic_ostream< wchar_t >&>() << std::declval<const U&>(), wchar_t{});
+#endif
+
+            template <class U>
+            static void left_shift_type(...);
+
+            using type = decltype(left_shift_type<T>(1L));
+
+            static_assert(!std::is_same<type, void>::value,
+#if defined(BOOST_LCAST_NO_WCHAR_T)
+                "Source type is not std::ostream`able and std::wostream`s are "
+                "not supported by your STL implementation"
+#else
+                "Source type is neither std::ostream`able nor std::wostream`able"
+#endif
+            );
+        };
+    }
+
+    namespace detail  // deduce_target_char_impl<T>
+    {
+        // If type T is `deduce_character_type_later` type, then tries to deduce
+        // character type using boost::has_right_shift<T> metafunction.
+        // Otherwise supplied type T is a character type, that must be normalized
+        // using normalize_single_byte_char<Char>.
+        // Executed at Stage 2  (See deduce_source_char<T> and deduce_target_char<T>)
+        template < class Char >
+        struct deduce_target_char_impl
+        {
+            typedef typename normalize_single_byte_char< Char >::type type;
+        };
+
+        template < class T >
+        struct deduce_target_char_impl< deduce_character_type_later<T> >
+        {
+            template <class U>
+            static auto right_shift_type(long)
+                -> decltype( std::declval<std::basic_istream< char >&>() >> std::declval<U&>(), char{});
+
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+            template <class U>
+            static auto right_shift_type(int)
+                -> decltype( std::declval<std::basic_istream< wchar_t >&>() >> std::declval<U&>(), wchar_t{});
+#endif
+
+            template <class U>
+            static void right_shift_type(...);
+
+            using type = decltype(right_shift_type<T>(1L));
+
+            static_assert(!std::is_same<type, void>::value,
+#if defined(BOOST_LCAST_NO_WCHAR_T)
+               "Target type is not std::istream`able and std::wistream`s are "
+               "not supported by your STL implementation"
+#else
+               "Target type is neither std::istream`able nor std::wistream`able"
+#endif
+            );
+        };
+    }
+
+    namespace detail  // deduce_target_char<T> and deduce_source_char<T>
+    {
+        // We deduce stream character types in two stages.
+        //
+        // Stage 1 is common for Target and Source. At Stage 1 we get
+        // non normalized character type (may contain unsigned/signed char)
+        // or deduce_character_type_later<T> where T is the original type.
+        // Stage 1 is executed by stream_char_common<T>
+        //
+        // At Stage 2 we normalize character types or try to deduce character
+        // type using metafunctions.
+        // Stage 2 is executed by deduce_target_char_impl<T> and
+        // deduce_source_char_impl<T>
+        //
+        // deduce_target_char<T> and deduce_source_char<T> functions combine
+        // both stages
+
+        template < class T >
+        struct deduce_target_char
+        {
+            typedef typename stream_char_common< T >::type stage1_type;
+            typedef typename deduce_target_char_impl< stage1_type >::type type;
+        };
+
+        template < class T >
+        struct deduce_source_char
+        {
+            typedef typename stream_char_common< T >::type stage1_type;
+            typedef typename deduce_source_char_impl< stage1_type >::type type;
+        };
+    }
+
+    namespace detail // array_to_pointer_decay<T>
+    {
+        template<class T>
+        struct array_to_pointer_decay
+        {
+            typedef T type;
+        };
+
+        template<class T, std::size_t N>
+        struct array_to_pointer_decay<T[N]>
+        {
+            typedef const T * type;
+        };
+    }
+
+    namespace detail // lcast_src_length
+    {
+        // Return max. length of string representation of Source;
+        template< class Source,         // Source type of lexical_cast.
+                  class Enable = void   // helper type
+                >
+        struct lcast_src_length
+        {
+            BOOST_STATIC_CONSTANT(std::size_t, value = 1);
+        };
+
+        // Helper for integral types.
+        // Notes on length calculation:
+        // Max length for 32bit int with grouping "\1" and thousands_sep ',':
+        // "-2,1,4,7,4,8,3,6,4,7"
+        //  ^                    - is_signed
+        //   ^                   - 1 digit not counted by digits10
+        //    ^^^^^^^^^^^^^^^^^^ - digits10 * 2
+        //
+        // Constant is_specialized is used instead of constant 1
+        // to prevent buffer overflow in a rare case when
+        // <boost/limits.hpp> doesn't add missing specialization for
+        // numeric_limits<T> for some integral type T.
+        // When is_specialized is false, the whole expression is 0.
+        template <class Source>
+        struct lcast_src_length<
+                    Source, typename std::enable_if<boost::detail::lcast::is_integral<Source>::value >::type
+                >
+        {
+            BOOST_STATIC_CONSTANT(std::size_t, value =
+                  std::numeric_limits<Source>::is_signed +
+                  std::numeric_limits<Source>::is_specialized + /* == 1 */
+                  std::numeric_limits<Source>::digits10 * 2
+              );
+        };
+
+        // Helper for floating point types.
+        // -1.23456789e-123456
+        // ^                   sign
+        //  ^                  leading digit
+        //   ^                 decimal point
+        //    ^^^^^^^^         lcast_precision<Source>::value
+        //            ^        "e"
+        //             ^       exponent sign
+        //              ^^^^^^ exponent (assumed 6 or less digits)
+        // sign + leading digit + decimal point + "e" + exponent sign == 5
+        template<class Source>
+        struct lcast_src_length<
+                Source, typename std::enable_if<std::is_floating_point<Source>::value >::type
+            >
+        {
+            static_assert(
+                    std::numeric_limits<Source>::max_exponent10 <=  999999L &&
+                    std::numeric_limits<Source>::min_exponent10 >= -999999L
+                , "");
+
+            BOOST_STATIC_CONSTANT(std::size_t, value =
+                    5 + lcast_precision<Source>::value + 6
+                );
+        };
+    }
+
+    namespace detail // lexical_cast_stream_traits<Source, Target>
+    {
+        template <class Source, class Target>
+        struct lexical_cast_stream_traits {
+            typedef typename boost::detail::array_to_pointer_decay<Source>::type src;
+            typedef typename std::remove_cv<src>::type            no_cv_src;
+
+            typedef boost::detail::deduce_source_char<no_cv_src>                           deduce_src_char_metafunc;
+            typedef typename deduce_src_char_metafunc::type           src_char_t;
+            typedef typename boost::detail::deduce_target_char<Target>::type target_char_t;
+
+            typedef typename boost::detail::widest_char<
+                target_char_t, src_char_t
+            >::type char_type;
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && defined(BOOST_NO_CXX11_UNICODE_LITERALS)
+            static_assert(!std::is_same<char16_t, src_char_t>::value
+                                        && !std::is_same<char16_t, target_char_t>::value,
+                "Your compiler does not have full support for char16_t" );
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && defined(BOOST_NO_CXX11_UNICODE_LITERALS)
+            static_assert(!std::is_same<char32_t, src_char_t>::value
+                                        && !std::is_same<char32_t, target_char_t>::value,
+                "Your compiler does not have full support for char32_t" );
+#endif
+
+            typedef std::char_traits<char_type> traits;
+
+            typedef boost::detail::lcast_src_length<no_cv_src> len_t;
+        };
+    }
+
+    namespace detail
+    {
+        template<typename Target, typename Source>
+        struct lexical_converter_impl
+        {
+            typedef lexical_cast_stream_traits<Source, Target>  stream_trait;
+
+            typedef detail::lcast::optimized_src_stream<
+                typename stream_trait::char_type,
+                typename stream_trait::traits,
+                stream_trait::len_t::value + 1
+            > optimized_src_stream;
+            
+            template <class T>
+            static auto detect_type(int)
+                -> decltype(std::declval<optimized_src_stream&>().stream_in(std::declval<lcast::exact<T>>()), optimized_src_stream{});
+
+            template <class T>
+            static lcast::ios_src_stream<typename stream_trait::char_type, typename stream_trait::traits> detect_type(...);
+
+            using from_src_stream = decltype(detect_type<Source>(1));
+
+            typedef detail::lcast::to_target_stream<
+                typename stream_trait::char_type,
+                typename stream_trait::traits
+            > to_target_stream;
+
+            static inline bool try_convert(const Source& arg, Target& result) {
+                from_src_stream src_stream;
+                if (!src_stream.stream_in(lcast::exact<Source>{arg}))
+                    return false;
+
+                to_target_stream out(src_stream.cbegin(), src_stream.cend());
+                if (!out.stream_out(result))
+                    return false;
+
+                return true;
+            }
+        };
+    }
+
+} // namespace boost
+
+#undef BOOST_LCAST_NO_WCHAR_T
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
+

include/boost/lexical_cast/detail/converter_lexical_streams.hpp

@@ -0,0 +1,763 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014, Nowember 2016
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_STREAMS_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_STREAMS_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+#include <cstddef>
+#include <string>
+#include <cstring>
+#include <cstdio>
+#include <type_traits>
+
+#include <boost/limits.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/core/snprintf.hpp>
+
+#ifndef BOOST_NO_STD_LOCALE
+#   include <locale>
+#else
+#   ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
+        // Getting error at this point means, that your STL library is old/lame/misconfigured.
+        // If nothing can be done with STL library, define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE,
+        // but beware: lexical_cast will understand only 'C' locale delimeters and thousands
+        // separators.
+#       error "Unable to use <locale> header. Define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE to force "
+#       error "boost::lexical_cast to use only 'C' locale during conversions."
+#   endif
+#endif
+
+#ifdef BOOST_NO_STRINGSTREAM
+#include <strstream>
+#else
+#include <sstream>
+#endif
+
+
+#include <array>
+#ifndef BOOST_NO_CWCHAR
+#   include <cwchar>
+#endif
+#include <istream>
+
+#include <boost/container/container_fwd.hpp>
+#ifndef BOOST_NO_CWCHAR
+#   include <cwchar>
+#endif
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+#include <boost/lexical_cast/detail/buffer_view.hpp>
+#include <boost/lexical_cast/detail/lcast_char_constants.hpp>
+#include <boost/lexical_cast/detail/lcast_unsigned_converters.hpp>
+#include <boost/lexical_cast/detail/lcast_basic_unlockedbuf.hpp>
+#include <boost/lexical_cast/detail/inf_nan.hpp>
+#include <boost/lexical_cast/detail/lcast_precision.hpp>
+#include <boost/lexical_cast/detail/type_traits.hpp>
+
+// Forward declarations
+namespace boost {
+    template<class T, std::size_t N>
+    class array;
+    template<class IteratorT>
+    class iterator_range;
+
+    // forward declaration of boost::basic_string_view from Utility
+    template<class Ch, class Tr> class basic_string_view;
+}
+
+namespace boost { namespace detail { namespace lcast {
+
+    template <typename T>
+    struct exact {
+        static_assert(!std::is_const<T>::value, "");
+        static_assert(!std::is_reference<T>::value, "");
+
+        const T& payload;
+    };
+
+    template< class CharT // a result of widest_char transformation
+            , class Traits
+            , std::size_t CharacterBufferSize
+            >
+    class optimized_src_stream {
+        CharT buffer[CharacterBufferSize];
+
+        // After the `stream_in(`  finishes, `[start, finish)` is
+        // the range to output by `operator >>`
+        const CharT*  start;
+        const CharT*  finish;
+    public:
+        optimized_src_stream(optimized_src_stream&&) = delete;
+        optimized_src_stream(const optimized_src_stream&) = delete;
+        optimized_src_stream& operator=(optimized_src_stream&&) = delete;
+        optimized_src_stream& operator=(const optimized_src_stream&) = delete;
+
+        optimized_src_stream() noexcept
+          : start(buffer)
+          , finish(buffer + CharacterBufferSize)
+        {}
+
+        const CharT* cbegin() const noexcept {
+            return start;
+        }
+
+        const CharT* cend() const noexcept {
+            return finish;
+        }
+
+    private:
+        bool shl_char(CharT ch) noexcept {
+            Traits::assign(buffer[0], ch);
+            finish = start + 1;
+            return true;
+        }
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+        template <class T>
+        bool shl_char(T ch) {
+            static_assert(sizeof(T) <= sizeof(CharT),
+                "boost::lexical_cast does not support narrowing of char types."
+                "Use boost::locale instead" );
+#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
+            std::locale loc;
+            CharT const w = BOOST_USE_FACET(std::ctype<CharT>, loc).widen(ch);
+#else
+            CharT const w = static_cast<CharT>(ch);
+#endif
+            Traits::assign(buffer[0], w);
+            finish = start + 1;
+            return true;
+        }
+#endif
+
+        bool shl_char_array(CharT const* str_value) noexcept {
+            start = str_value;
+            finish = start + Traits::length(str_value);
+            return true;
+        }
+
+        bool shl_char_array_limited(CharT const* str, std::size_t max_size) noexcept {
+            start = str;
+            finish = start;
+            const auto zero = Traits::to_char_type(0);
+            while (finish < start + max_size && zero != *finish) {
+                 ++ finish;
+            }
+            return true;
+        }
+
+        template <class T>
+        inline bool shl_unsigned(const T n) {
+            CharT* tmp_finish = buffer + CharacterBufferSize;
+            start = lcast_put_unsigned<Traits, T, CharT>(n, tmp_finish).convert();
+            finish = tmp_finish;
+            return true;
+        }
+
+        template <class T>
+        inline bool shl_signed(const T n) {
+            CharT* tmp_finish = buffer + CharacterBufferSize;
+            typedef typename boost::detail::lcast::make_unsigned<T>::type utype;
+            CharT* tmp_start = lcast_put_unsigned<Traits, utype, CharT>(lcast_to_unsigned(n), tmp_finish).convert();
+            if (n < 0) {
+                --tmp_start;
+                CharT const minus = lcast_char_constants<CharT>::minus;
+                Traits::assign(*tmp_start, minus);
+            }
+            start = tmp_start;
+            finish = tmp_finish;
+            return true;
+        }
+
+        bool shl_real_type(lcast::exact<float> val, char* begin) {
+            const double val_as_double = static_cast<double>(val.payload);
+            finish = start +
+                boost::core::snprintf(begin, CharacterBufferSize,
+                "%.*g", static_cast<int>(boost::detail::lcast_precision<float>::value), val_as_double);
+            return finish > start;
+        }
+
+        bool shl_real_type(lcast::exact<double> val, char* begin) {
+            finish = start +
+                boost::core::snprintf(begin, CharacterBufferSize,
+                "%.*g", static_cast<int>(boost::detail::lcast_precision<double>::value), val.payload);
+            return finish > start;
+        }
+
+#ifndef __MINGW32__
+        bool shl_real_type(lcast::exact<long double> val, char* begin) {
+            finish = start +
+                boost::core::snprintf(begin, CharacterBufferSize,
+                "%.*Lg", static_cast<int>(boost::detail::lcast_precision<long double>::value), val.payload );
+            return finish > start;
+        }
+#else
+        bool shl_real_type(lcast::exact<long double> val, char* begin) {
+            return shl_real_type(lcast::exact<double>{static_cast<double>(val.payload)}, begin);
+        }
+#endif
+
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+        bool shl_real_type(lcast::exact<float> val, wchar_t* begin) {
+            const double val_as_double = static_cast<double>(val.payload);
+            finish = start + boost::core::swprintf(
+                begin, CharacterBufferSize, L"%.*g",
+                static_cast<int>(boost::detail::lcast_precision<float>::value),
+                val_as_double
+            );
+            return finish > start;
+        }
+
+        bool shl_real_type(lcast::exact<double> val, wchar_t* begin) {
+            finish = start + boost::core::swprintf(
+              begin, CharacterBufferSize, L"%.*g",
+              static_cast<int>(boost::detail::lcast_precision<double>::value),
+              val.payload
+            );
+            return finish > start;
+        }
+
+        bool shl_real_type(lcast::exact<long double> val, wchar_t* begin) {
+            finish = start + boost::core::swprintf(
+                begin, CharacterBufferSize, L"%.*Lg",
+                static_cast<int>(boost::detail::lcast_precision<long double>::value),
+                val.payload
+            );
+            return finish > start;
+        }
+#endif
+    public:
+        template <class C>
+        using enable_if_compatible_char_t = typename std::enable_if<
+            std::is_same<const C, const CharT>::value || (
+                std::is_same<const char, const CharT>::value && (
+                    std::is_same<const C, const unsigned char>::value ||
+                    std::is_same<const C, const signed char>::value
+                )
+            ), bool
+        >::type;
+
+        template<class CharTraits, class Alloc>
+        bool stream_in(lcast::exact<std::basic_string<CharT,CharTraits,Alloc>> x) noexcept {
+            start = x.payload.data();
+            finish = start + x.payload.length();
+            return true;
+        }
+
+        template<class CharTraits, class Alloc>
+        bool stream_in(lcast::exact<boost::container::basic_string<CharT,CharTraits,Alloc>> x) noexcept {
+            start = x.payload.data();
+            finish = start + x.payload.length();
+            return true;
+        }
+
+        bool stream_in(lcast::exact<bool> x) noexcept {
+            CharT const czero = lcast_char_constants<CharT>::zero;
+            Traits::assign(buffer[0], Traits::to_char_type(czero + x.payload));
+            finish = start + 1;
+            return true;
+        }
+
+        bool stream_in(lcast::exact<boost::conversion::detail::buffer_view<CharT>> x) noexcept {
+            start = x.payload.begin;
+            finish = x.payload.end;
+            return true;
+        }
+
+        template <class C>
+        enable_if_compatible_char_t<C>
+        stream_in(lcast::exact<boost::iterator_range<C*>> x) noexcept {
+            auto buf = boost::conversion::detail::make_buffer_view(x.payload.begin(), x.payload.end());
+            return stream_in(lcast::exact<decltype(buf)>{buf});
+        }
+
+        bool stream_in(lcast::exact<char> x)                    { return shl_char(x.payload); }
+        bool stream_in(lcast::exact<unsigned char> x)           { return shl_char(static_cast<char>(x.payload)); }
+        bool stream_in(lcast::exact<signed char> x)             { return shl_char(static_cast<char>(x.payload)); }
+
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+        template <class C>
+        typename std::enable_if<boost::detail::is_character<C>::value, bool>::type
+                stream_in(lcast::exact<C> x)                    { return shl_char(x.payload); }
+#endif
+
+        template <class Type>
+        enable_if_compatible_char_t<Type>
+                stream_in(lcast::exact<Type*> x)                { return shl_char_array(reinterpret_cast<CharT const*>(x.payload)); }
+
+        template <class Type>
+        typename std::enable_if<!std::is_floating_point<Type>::value && boost::detail::lcast::is_signed<Type>::value && !std::is_enum<Type>::value, bool>::type
+                stream_in(lcast::exact<Type> x)                  { return shl_signed(x.payload); }
+
+        template <class Type>
+        typename std::enable_if<boost::detail::lcast::is_unsigned<Type>::value && !std::is_enum<Type>::value, bool>::type
+                stream_in(lcast::exact<Type> x)                  { return shl_unsigned(x.payload); }
+
+        template <class Type>
+        auto stream_in(lcast::exact<Type> x) -> decltype(shl_real_type(x, buffer)) {
+            const CharT* inf_nan  = detail::get_inf_nan(x.payload, CharT());
+            if (inf_nan) {
+                start = inf_nan;
+                finish = start + Traits::length(inf_nan);
+                return true;
+            }
+            return shl_real_type(x, buffer);
+        }
+
+        template <class C, std::size_t N>
+        enable_if_compatible_char_t<C>
+        stream_in(lcast::exact<boost::array<C, N>> x) noexcept {
+            return shl_char_array_limited(reinterpret_cast<const CharT*>(x.payload.data()), N);
+        }
+
+        template <class C, std::size_t N>
+        enable_if_compatible_char_t<C>
+        stream_in(lcast::exact<std::array<C, N>> x) noexcept {
+            return shl_char_array_limited(reinterpret_cast<const CharT*>(x.payload.data()), N);
+        }
+
+#ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
+        template <class C, class CharTraits>
+        enable_if_compatible_char_t<C>
+        stream_in(lcast::exact<std::basic_string_view<C, CharTraits>> x) noexcept {
+            start = reinterpret_cast<const CharT*>(x.payload.data());
+            finish = start + x.payload.size();
+            return true;
+        }
+#endif
+        template <class C, class CharTraits>
+        enable_if_compatible_char_t<C>
+        stream_in(lcast::exact<boost::basic_string_view<C, CharTraits>> x) noexcept {
+            start = reinterpret_cast<const CharT*>(x.payload.data());
+            finish = start + x.payload.size();
+            return true;
+        }
+    };
+
+
+    template <class CharT, class Traits>
+    class ios_src_stream {
+        typedef detail::lcast::out_stream_t<CharT, Traits> deduced_out_stream_t;
+        typedef detail::lcast::stringbuffer_t<CharT, Traits> deduced_out_buffer_t;
+
+        deduced_out_buffer_t out_buffer;
+        deduced_out_stream_t out_stream;
+
+        const CharT*  start = nullptr;
+        const CharT*  finish = nullptr;
+    public:
+        ios_src_stream(ios_src_stream&&) = delete;
+        ios_src_stream(const ios_src_stream&) = delete;
+        ios_src_stream& operator=(ios_src_stream&&) = delete;
+        ios_src_stream& operator=(const ios_src_stream&) = delete;
+
+        ios_src_stream(): out_buffer(), out_stream(&out_buffer) {}
+
+        const CharT* cbegin() const noexcept {
+            return start;
+        }
+
+        const CharT* cend() const noexcept {
+            return finish;
+        }
+    private:
+        const deduced_out_buffer_t* get_rdbuf() const {
+            return static_cast<deduced_out_buffer_t*>(
+                out_stream.rdbuf()
+            );
+        }
+
+        template<typename InputStreamable>
+        bool shl_input_streamable(InputStreamable& input) {
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE)
+            // If you have compilation error at this point, than your STL library
+            // does not support such conversions. Try updating it.
+            static_assert(std::is_same<char, CharT>::value, "");
+#endif
+
+#ifndef BOOST_NO_EXCEPTIONS
+            out_stream.exceptions(std::ios::badbit);
+            try {
+#endif
+            bool const result = !(out_stream << input).fail();
+            const auto* const p = get_rdbuf();
+            start = p->pbase();
+            finish = p->pptr();
+            return result;
+#ifndef BOOST_NO_EXCEPTIONS
+            } catch (const ::std::ios_base::failure& /*f*/) {
+                return false;
+            }
+#endif
+        }
+
+        template <class T>
+        bool shl_char_array(T const* str_value) {
+            static_assert(sizeof(T) <= sizeof(CharT),
+                "boost::lexical_cast does not support narrowing of char types."
+                "Use boost::locale instead" );
+            return shl_input_streamable(str_value);
+        }
+
+        template <class T>
+        bool shl_real(T val) {
+            const CharT* inf_nan  = detail::get_inf_nan(val, CharT());
+            if (inf_nan) {
+                start = inf_nan;
+                finish = start + Traits::length(inf_nan);
+                return true;
+            }
+
+            boost::detail::lcast_set_precision(out_stream, &val);
+            return shl_input_streamable(val);
+        }
+
+    public:
+        template <class Type>
+        typename std::enable_if<boost::detail::is_character<Type>::value && sizeof(char) == sizeof(Type), bool>::type
+                stream_in(lcast::exact<const Type*> x)         { return shl_char_array(reinterpret_cast<char const*>(x.payload)); }
+
+        template <class Type>
+        typename std::enable_if<boost::detail::is_character<Type>::value && sizeof(char) != sizeof(Type), bool>::type
+                stream_in(lcast::exact<const Type*> x)         { return shl_char_array(x.payload); }
+
+        bool stream_in(lcast::exact<float> x)                  { return shl_real(x.payload); }
+        bool stream_in(lcast::exact<double> x)                 { return shl_real(x.payload); }
+        bool stream_in(lcast::exact<long double> x)            {
+#ifndef __MINGW32__
+            return shl_real(x.payload);
+#else
+            return shl_real(static_cast<double>(x.payload));
+#endif
+        }
+
+        template <class C>
+        typename std::enable_if<boost::detail::is_character<C>::value, bool>::type
+        stream_in(lcast::exact<iterator_range<C*>> x) noexcept {
+            auto buf = boost::conversion::detail::make_buffer_view(x.payload.begin(), x.payload.end());
+            return stream_in(lcast::exact<decltype(buf)>{buf});
+        }
+
+        template <class C>
+        typename std::enable_if<boost::detail::is_character<C>::value, bool>::type
+        stream_in(lcast::exact<iterator_range<const C*>> x) noexcept {
+            auto buf = boost::conversion::detail::make_buffer_view(x.payload.begin(), x.payload.end());
+            return stream_in(lcast::exact<decltype(buf)>{buf});
+        }
+
+        template <class InStreamable>
+        bool stream_in(lcast::exact<InStreamable> x)  { return shl_input_streamable(x.payload); }
+    };
+
+
+    template <class CharT, class Traits>
+    class to_target_stream {
+        //`[start, finish)` is the range to output by `operator >>`
+        const CharT*        start;
+        const CharT* const  finish;
+
+    public:
+        to_target_stream(to_target_stream&&) = delete;
+        to_target_stream(const to_target_stream&) = delete;
+        to_target_stream& operator=(to_target_stream&&) = delete;
+        to_target_stream& operator=(const to_target_stream&) = delete;
+
+        to_target_stream(const CharT* begin, const CharT* end) noexcept
+          : start(begin)
+          , finish(end)
+        {}
+
+    private:
+        template <typename Type>
+#if defined(__clang__) && (__clang_major__ > 3 || __clang_minor__ > 6)
+        __attribute__((no_sanitize("unsigned-integer-overflow")))
+#endif
+        bool shr_unsigned(Type& output) {
+            if (start == finish) return false;
+            CharT const minus = lcast_char_constants<CharT>::minus;
+            CharT const plus = lcast_char_constants<CharT>::plus;
+            bool const has_minus = Traits::eq(minus, *start);
+
+            /* We won`t use `start' any more, so no need in decrementing it after */
+            if (has_minus || Traits::eq(plus, *start)) {
+                ++start;
+            }
+
+            bool const succeed = lcast_ret_unsigned<Traits, Type, CharT>(output, start, finish).convert();
+
+            if (has_minus) {
+                output = static_cast<Type>(0u - output);
+            }
+
+            return succeed;
+        }
+
+        template <typename Type>
+#if defined(__clang__) && (__clang_major__ > 3 || __clang_minor__ > 6)
+        __attribute__((no_sanitize("unsigned-integer-overflow")))
+#endif
+        bool shr_signed(Type& output) {
+            if (start == finish) return false;
+            CharT const minus = lcast_char_constants<CharT>::minus;
+            CharT const plus = lcast_char_constants<CharT>::plus;
+            typedef typename boost::detail::lcast::make_unsigned<Type>::type utype;
+            utype out_tmp = 0;
+            bool const has_minus = Traits::eq(minus, *start);
+
+            /* We won`t use `start' any more, so no need in decrementing it after */
+            if (has_minus || Traits::eq(plus, *start)) {
+                ++start;
+            }
+
+            bool succeed = lcast_ret_unsigned<Traits, utype, CharT>(out_tmp, start, finish).convert();
+            if (has_minus) {
+                utype const comp_val = (static_cast<utype>(1) << std::numeric_limits<Type>::digits);
+                succeed = succeed && out_tmp<=comp_val;
+                output = static_cast<Type>(0u - out_tmp);
+            } else {
+                utype const comp_val = static_cast<utype>((std::numeric_limits<Type>::max)());
+                succeed = succeed && out_tmp<=comp_val;
+                output = static_cast<Type>(out_tmp);
+            }
+            return succeed;
+        }
+
+        template<typename InputStreamable>
+        bool shr_using_base_class(InputStreamable& output)
+        {
+            static_assert(
+                !std::is_pointer<InputStreamable>::value,
+                "boost::lexical_cast can not convert to pointers"
+            );
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_LOCALE)
+            static_assert(std::is_same<char, CharT>::value,
+                "boost::lexical_cast can not convert, because your STL library does not "
+                "support such conversions. Try updating it."
+            );
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM)
+            std::istrstream stream(start, static_cast<std::istrstream::streamsize>(finish - start));
+#else
+            typedef detail::lcast::buffer_t<CharT, Traits> buffer_t;
+            buffer_t buf;
+            // Usually `istream` and `basic_istream` do not modify
+            // content of buffer; `buffer_t` assures that this is true
+            buf.setbuf(const_cast<CharT*>(start), static_cast<typename buffer_t::streamsize>(finish - start));
+#if defined(BOOST_NO_STD_LOCALE)
+            std::istream stream(&buf);
+#else
+            std::basic_istream<CharT, Traits> stream(&buf);
+#endif // BOOST_NO_STD_LOCALE
+#endif // BOOST_NO_STRINGSTREAM
+
+#ifndef BOOST_NO_EXCEPTIONS
+            stream.exceptions(std::ios::badbit);
+            try {
+#endif
+            stream.unsetf(std::ios::skipws);
+            boost::detail::lcast_set_precision(stream, static_cast<InputStreamable*>(0));
+
+            return (stream >> output)
+                && (stream.get() == Traits::eof());
+
+#ifndef BOOST_NO_EXCEPTIONS
+            } catch (const ::std::ios_base::failure& /*f*/) {
+                return false;
+            }
+#endif
+        }
+
+        template<class T>
+        inline bool shr_xchar(T& output) noexcept {
+            static_assert(sizeof(CharT) == sizeof(T),
+                "boost::lexical_cast does not support narrowing of character types."
+                "Use boost::locale instead" );
+            bool const ok = (finish - start == 1);
+            if (ok) {
+                CharT out;
+                Traits::assign(out, *start);
+                output = static_cast<T>(out);
+            }
+            return ok;
+        }
+
+        template <std::size_t N, class ArrayT>
+        bool shr_std_array(ArrayT& output) noexcept {
+            const std::size_t size = static_cast<std::size_t>(finish - start);
+            if (size > N - 1) { // `-1` because we need to store \0 at the end
+                return false;
+            }
+
+            std::memcpy(&output[0], start, size * sizeof(CharT));
+            output[size] = Traits::to_char_type(0);
+            return true;
+        }
+
+    public:
+        bool stream_out(unsigned short& output)             { return shr_unsigned(output); }
+        bool stream_out(unsigned int& output)               { return shr_unsigned(output); }
+        bool stream_out(unsigned long int& output)          { return shr_unsigned(output); }
+        bool stream_out(short& output)                      { return shr_signed(output); }
+        bool stream_out(int& output)                        { return shr_signed(output); }
+        bool stream_out(long int& output)                   { return shr_signed(output); }
+#if defined(BOOST_HAS_LONG_LONG)
+        bool stream_out(boost::ulong_long_type& output)     { return shr_unsigned(output); }
+        bool stream_out(boost::long_long_type& output)      { return shr_signed(output); }
+#elif defined(BOOST_HAS_MS_INT64)
+        bool stream_out(unsigned __int64& output)           { return shr_unsigned(output); }
+        bool stream_out(__int64& output)                    { return shr_signed(output); }
+#endif
+
+#ifdef BOOST_HAS_INT128
+        bool stream_out(boost::uint128_type& output)        { return shr_unsigned(output); }
+        bool stream_out(boost::int128_type& output)         { return shr_signed(output); }
+#endif
+
+        bool stream_out(char& output)                       { return shr_xchar(output); }
+        bool stream_out(unsigned char& output)              { return shr_xchar(output); }
+        bool stream_out(signed char& output)                { return shr_xchar(output); }
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+        bool stream_out(wchar_t& output)                    { return shr_xchar(output); }
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
+        bool stream_out(char16_t& output)                   { return shr_xchar(output); }
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
+        bool stream_out(char32_t& output)                   { return shr_xchar(output); }
+#endif
+        template<class CharTraits, class Alloc>
+        bool stream_out(std::basic_string<CharT,CharTraits,Alloc>& str) {
+            str.assign(start, finish); return true;
+        }
+
+        template<class CharTraits, class Alloc>
+        bool stream_out(boost::container::basic_string<CharT,CharTraits,Alloc>& str) {
+            str.assign(start, finish); return true;
+        }
+
+        template <class C, std::size_t N>
+        bool stream_out(std::array<C, N>& output) noexcept {
+            static_assert(sizeof(C) == sizeof(CharT), "");
+            return shr_std_array<N>(output);
+        }
+
+        template <class C, std::size_t N>
+        bool stream_out(boost::array<C, N>& output) noexcept {
+            static_assert(sizeof(C) == sizeof(CharT), "");
+            return shr_std_array<N>(output);
+        }
+
+        bool stream_out(bool& output) noexcept {
+            output = false; // Suppress warning about uninitalized variable
+
+            if (start == finish) return false;
+            CharT const zero = lcast_char_constants<CharT>::zero;
+            CharT const plus = lcast_char_constants<CharT>::plus;
+            CharT const minus = lcast_char_constants<CharT>::minus;
+
+            const CharT* const dec_finish = finish - 1;
+            output = Traits::eq(*dec_finish, zero + 1);
+            if (!output && !Traits::eq(*dec_finish, zero)) {
+                return false; // Does not ends on '0' or '1'
+            }
+
+            if (start == dec_finish) return true;
+
+            // We may have sign at the beginning
+            if (Traits::eq(plus, *start) || (Traits::eq(minus, *start) && !output)) {
+                ++ start;
+            }
+
+            // Skipping zeros
+            while (start != dec_finish) {
+                if (!Traits::eq(zero, *start)) {
+                    return false; // Not a zero => error
+                }
+
+                ++ start;
+            }
+
+            return true;
+        }
+
+    private:
+        // Not optimised converter
+        template <class T>
+        bool float_types_converter_internal(T& output) {
+            if (parse_inf_nan(start, finish, output)) return true;
+            bool const return_value = shr_using_base_class(output);
+
+            /* Some compilers and libraries successfully
+             * parse 'inf', 'INFINITY', '1.0E', '1.0E-'...
+             * We are trying to provide a unified behaviour,
+             * so we just forbid such conversions (as some
+             * of the most popular compilers/libraries do)
+             * */
+            CharT const minus = lcast_char_constants<CharT>::minus;
+            CharT const plus = lcast_char_constants<CharT>::plus;
+            CharT const capital_e = lcast_char_constants<CharT>::capital_e;
+            CharT const lowercase_e = lcast_char_constants<CharT>::lowercase_e;
+            if ( return_value &&
+                 (
+                    Traits::eq(*(finish-1), lowercase_e)                   // 1.0e
+                    || Traits::eq(*(finish-1), capital_e)                  // 1.0E
+                    || Traits::eq(*(finish-1), minus)                      // 1.0e- or 1.0E-
+                    || Traits::eq(*(finish-1), plus)                       // 1.0e+ or 1.0E+
+                 )
+            ) return false;
+
+            return return_value;
+        }
+
+    public:
+        bool stream_out(float& output) { return float_types_converter_internal(output); }
+        bool stream_out(double& output) { return float_types_converter_internal(output); }
+        bool stream_out(long double& output) { return float_types_converter_internal(output); }
+
+        // Generic istream-based algorithm.
+        // lcast_streambuf_for_target<InputStreamable>::value is true.
+        template <typename InputStreamable>
+        bool stream_out(InputStreamable& output) {
+            return shr_using_base_class(output);
+        }
+    };
+    
+}}} // namespace boost::detail::lcast
+
+#undef BOOST_LCAST_NO_WCHAR_T
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_HPP
+

include/boost/lexical_cast/detail/converter_numeric.hpp

@@ -0,0 +1,190 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2016
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_NUMERIC_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_NUMERIC_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <type_traits>
+#include <boost/core/cmath.hpp>
+#include <boost/limits.hpp>
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+#include <boost/lexical_cast/detail/type_traits.hpp>
+
+namespace boost { namespace detail {
+
+template <class Source, class Target>
+bool ios_numeric_comparer_float(Source x, Source y) noexcept {
+    return x == y
+        || (boost::core::isnan(x) && boost::core::isnan(y))
+        || (x < (std::numeric_limits<Target>::min)())
+    ;
+}
+
+template <class RangeType, class T>
+constexpr bool is_out_of_range_for(T value) noexcept {
+    return value > static_cast<T>((std::numeric_limits<RangeType>::max)())
+        || value < static_cast<T>((std::numeric_limits<RangeType>::min)())
+        || boost::core::isnan(value);
+}
+
+
+// integral -> integral
+template <typename Target, typename Source>
+typename std::enable_if<
+    !std::is_floating_point<Source>::value && !std::is_floating_point<Target>::value, bool
+>::type noexcept_numeric_convert(Source arg, Target& result) noexcept {
+    const Target target_tmp = static_cast<Target>(arg);
+    const Source arg_restored = static_cast<Source>(target_tmp);
+    if (arg == arg_restored) {
+        result = target_tmp;
+        return true;
+    }
+    return false;
+}
+
+// integral -> floating point
+template <typename Target, typename Source>
+typename std::enable_if<
+    !std::is_floating_point<Source>::value && std::is_floating_point<Target>::value, bool
+>::type noexcept_numeric_convert(Source arg, Target& result) noexcept {
+    const Target target_tmp = static_cast<Target>(arg);
+    result = target_tmp;
+    return true;
+}
+
+
+// floating point -> floating point
+template <typename Target, typename Source>
+typename std::enable_if<
+    std::is_floating_point<Source>::value && std::is_floating_point<Target>::value, bool
+>::type noexcept_numeric_convert(Source arg, Target& result) noexcept {
+    const Target target_tmp = static_cast<Target>(arg);
+    const Source arg_restored = static_cast<Source>(target_tmp);
+    if (detail::ios_numeric_comparer_float<Source, Target>(arg, arg_restored)) {
+        result = target_tmp;
+        return true;
+    }
+
+    return false;
+}
+
+// floating point -> integral
+template <typename Target, typename Source>
+typename std::enable_if<
+    std::is_floating_point<Source>::value && !std::is_floating_point<Target>::value, bool
+>::type noexcept_numeric_convert(Source arg, Target& result) noexcept {
+    if (detail::is_out_of_range_for<Target>(arg)) {
+        return false;
+    }
+
+    const Target target_tmp = static_cast<Target>(arg);
+    const Source arg_restored = static_cast<Source>(target_tmp);
+    if (arg == arg_restored /* special values are handled in detail::is_out_of_range_for */) {
+        result = target_tmp;
+        return true;
+    }
+
+    return false;
+}
+
+struct lexical_cast_dynamic_num_not_ignoring_minus
+{
+    template <typename Target, typename Source>
+    static inline bool try_convert(Source arg, Target& result) noexcept {
+        return boost::detail::noexcept_numeric_convert<Target, Source >(arg, result);
+    }
+};
+
+struct lexical_cast_dynamic_num_ignoring_minus
+{
+    template <typename Target, typename Source>
+#if defined(__clang__) && (__clang_major__ > 3 || __clang_minor__ > 6)
+    __attribute__((no_sanitize("unsigned-integer-overflow")))
+#endif
+    static inline bool try_convert(Source arg, Target& result) noexcept {
+        typedef typename std::conditional<
+                std::is_floating_point<Source>::value,
+                std::conditional<true, Source, Source>,  // std::type_identity emulation
+                boost::detail::lcast::make_unsigned<Source>
+        >::type usource_lazy_t;
+        typedef typename usource_lazy_t::type usource_t;
+
+        if (arg < 0) {
+            const bool res = boost::detail::noexcept_numeric_convert<Target, usource_t>(
+                static_cast<usource_t>(0u - static_cast<usource_t>(arg)), result
+            );
+            result = static_cast<Target>(0u - result);
+            return res;
+        } else {
+            return boost::detail::noexcept_numeric_convert<Target, usource_t>(arg, result);
+        }
+    }
+};
+
+/*
+ * dynamic_num_converter_impl follows the rules:
+ * 1) If Source can be converted to Target without precision loss and
+ * without overflows, then assign Source to Target and return
+ *
+ * 2) If Source is less than 0 and Target is an unsigned integer,
+ * then negate Source, check the requirements of rule 1) and if
+ * successful, assign static_casted Source to Target and return
+ *
+ * 3) Otherwise throw a bad_lexical_cast exception
+ *
+ *
+ * Rule 2) required because boost::lexical_cast has the behavior of
+ * stringstream, which uses the rules of scanf for conversions. And
+ * in the C99 standard for unsigned input value minus sign is
+ * optional, so if a negative number is read, no errors will arise
+ * and the result will be the two's complement.
+ */
+template <typename Target, typename Source>
+struct dynamic_num_converter_impl
+{
+    static inline bool try_convert(Source arg, Target& result) noexcept {
+        typedef typename std::conditional<
+            boost::detail::lcast::is_unsigned<Target>::value &&
+            (boost::detail::lcast::is_signed<Source>::value || std::is_floating_point<Source>::value) &&
+            !(std::is_same<Source, bool>::value) &&
+            !(std::is_same<Target, bool>::value),
+            lexical_cast_dynamic_num_ignoring_minus,
+            lexical_cast_dynamic_num_not_ignoring_minus
+        >::type caster_type;
+
+        return caster_type::try_convert(arg, result);
+    }
+};
+
+}} // namespace boost::detail
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_NUMERIC_HPP
+

include/boost/lexical_cast/detail/inf_nan.hpp

@@ -0,0 +1,195 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_INF_NAN_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_INF_NAN_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+#include <boost/limits.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/core/cmath.hpp>
+#include <cstddef>
+#include <cstring>
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+#include <boost/lexical_cast/detail/lcast_char_constants.hpp>
+
+namespace boost {
+    namespace detail
+    {
+        template <class CharT>
+        bool lc_iequal(const CharT* val, const CharT* lcase, const CharT* ucase, unsigned int len) noexcept {
+            for( unsigned int i=0; i < len; ++i ) {
+                if ( val[i] != lcase[i] && val[i] != ucase[i] ) return false;
+            }
+
+            return true;
+        }
+
+        /* Returns true and sets the correct value if found NaN or Inf. */
+        template <class CharT, class T>
+        inline bool parse_inf_nan_impl(const CharT* begin, const CharT* end, T& value
+            , const CharT* lc_NAN, const CharT* lc_nan
+            , const CharT* lc_INFINITY, const CharT* lc_infinity
+            , const CharT opening_brace, const CharT closing_brace) noexcept
+        {
+            if (begin == end) return false;
+            const CharT minus = lcast_char_constants<CharT>::minus;
+            const CharT plus = lcast_char_constants<CharT>::plus;
+            const int inifinity_size = 8; // == sizeof("infinity") - 1
+
+            /* Parsing +/- */
+            bool const has_minus = (*begin == minus);
+            if (has_minus || *begin == plus) {
+                ++ begin;
+            }
+
+            if (end - begin < 3) return false;
+            if (lc_iequal(begin, lc_nan, lc_NAN, 3)) {
+                begin += 3;
+                if (end != begin) {
+                    /* It is 'nan(...)' or some bad input*/
+
+                    if (end - begin < 2) return false; // bad input
+                    -- end;
+                    if (*begin != opening_brace || *end != closing_brace) return false; // bad input
+                }
+
+                if( !has_minus ) value = std::numeric_limits<T>::quiet_NaN();
+                else value = boost::core::copysign(std::numeric_limits<T>::quiet_NaN(), static_cast<T>(-1));
+                return true;
+            } else if (
+                ( /* 'INF' or 'inf' */
+                  end - begin == 3      // 3 == sizeof('inf') - 1
+                  && lc_iequal(begin, lc_infinity, lc_INFINITY, 3)
+                )
+                ||
+                ( /* 'INFINITY' or 'infinity' */
+                  end - begin == inifinity_size
+                  && lc_iequal(begin, lc_infinity, lc_INFINITY, inifinity_size)
+                )
+             )
+            {
+                if( !has_minus ) value = std::numeric_limits<T>::infinity();
+                else value = -std::numeric_limits<T>::infinity();
+                return true;
+            }
+
+            return false;
+        }
+
+        template <class CharT, class T>
+        const CharT* get_inf_nan_impl(T value
+                         , const CharT* lc_nan
+                         , const CharT* lc_minus_nan
+                         , const CharT* lc_infinity
+                         , const CharT* lc_minus_infinity) noexcept
+        {
+            if (boost::core::isnan(value)) {
+                if (boost::core::signbit(value)) {
+                    return lc_minus_nan;
+                }
+                return lc_nan;
+            } else if (boost::core::isinf(value)) {
+                if (boost::core::signbit(value)) {
+                    return lc_minus_infinity;
+                }
+                return lc_infinity;
+            }
+
+            return nullptr;
+        }
+
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+        template <class T>
+        bool parse_inf_nan(const wchar_t* begin, const wchar_t* end, T& value) noexcept {
+            return parse_inf_nan_impl(begin, end, value
+                               , L"NAN", L"nan"
+                               , L"INFINITY", L"infinity"
+                               , L'(', L')');
+        }
+
+        template <class T>
+        const wchar_t* get_inf_nan(T value, wchar_t) noexcept {
+            return detail::get_inf_nan_impl(value, L"nan", L"-nan", L"inf", L"-inf");
+        }
+
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
+        template <class T>
+        bool parse_inf_nan(const char16_t* begin, const char16_t* end, T& value) noexcept {
+            return parse_inf_nan_impl(begin, end, value
+                               , u"NAN", u"nan"
+                               , u"INFINITY", u"infinity"
+                               , u'(', u')');
+        }
+
+        template <class T>
+        const char16_t* get_inf_nan(T value, char16_t) noexcept {
+            return detail::get_inf_nan_impl(value, u"nan", u"-nan", u"inf", u"-inf");
+        }
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS)
+        template <class T>
+        bool parse_inf_nan(const char32_t* begin, const char32_t* end, T& value) noexcept {
+            return parse_inf_nan_impl(begin, end, value
+                               , U"NAN", U"nan"
+                               , U"INFINITY", U"infinity"
+                               , U'(', U')');
+        }
+
+        template <class T>
+        const char32_t* get_inf_nan(T value, char32_t) noexcept {
+            return detail::get_inf_nan_impl(value, U"nan", U"-nan", U"inf", U"-inf");
+        }
+#endif
+
+        template <class CharT, class T>
+        bool parse_inf_nan(const CharT* begin, const CharT* end, T& value) noexcept {
+            return parse_inf_nan_impl(begin, end, value
+                               , "NAN", "nan"
+                               , "INFINITY", "infinity"
+                               , '(', ')');
+        }
+
+        template <class T>
+        const char* get_inf_nan(T value, char) noexcept {
+            return detail::get_inf_nan_impl(value, "nan", "-nan", "inf", "-inf");
+        }
+    }
+} // namespace boost
+
+#undef BOOST_LCAST_NO_WCHAR_T
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_INF_NAN_HPP
+

include/boost/lexical_cast/detail/is_character.hpp

@@ -0,0 +1,60 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <type_traits>
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+namespace boost { namespace detail {
+
+// returns true, if T is one of the character types
+template < typename T >
+using is_character = std::integral_constant<
+    bool,
+    std::is_same< T, char >::value ||
+#if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING)
+    std::is_same< T, wchar_t >::value ||
+#endif
+#ifndef BOOST_NO_CXX11_CHAR16_T
+    std::is_same< T, char16_t >::value ||
+#endif
+#ifndef BOOST_NO_CXX11_CHAR32_T
+    std::is_same< T, char32_t >::value ||
+#endif
+    std::is_same< T, unsigned char >::value ||
+    std::is_same< T, signed char >::value
+>;
+
+}}
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_IS_CHARACTER_HPP
+

include/boost/lexical_cast/detail/lcast_basic_unlockedbuf.hpp

@@ -0,0 +1,82 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_BASIC_UNLOCKEDBUF_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_BASIC_UNLOCKEDBUF_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+
+#ifdef BOOST_NO_STRINGSTREAM
+#include <strstream>
+#else
+#include <sstream>
+#endif
+
+#include <boost/detail/basic_pointerbuf.hpp>
+#ifndef BOOST_NO_CWCHAR
+#   include <cwchar>
+#endif
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+namespace boost { namespace detail { namespace lcast {
+
+    // acts as a stream buffer which wraps around a pair of pointers
+    // and gives acces to internals
+    template <class BufferType, class CharT>
+    class basic_unlockedbuf : public basic_pointerbuf<CharT, BufferType> {
+    public:
+        typedef basic_pointerbuf<CharT, BufferType> base_type;
+        typedef typename base_type::streamsize streamsize;
+
+        using base_type::pptr;
+        using base_type::pbase;
+        using base_type::setbuf;
+    };
+
+#if defined(BOOST_NO_STRINGSTREAM)
+    template <class CharT, class Traits>
+    using out_stream_t = std::ostream;
+
+    template <class CharT, class Traits>
+    using stringbuffer_t = basic_unlockedbuf<std::strstreambuf, char>;
+#elif defined(BOOST_NO_STD_LOCALE)
+    template <class CharT, class Traits>
+    using out_stream_t = std::ostream;
+
+    template <class CharT, class Traits>
+    using stringbuffer_t = basic_unlockedbuf<std::stringbuf, char>;
+
+    template <class CharT, class Traits>
+    using buffer_t = basic_unlockedbuf<std::streambuf, char>;
+#else
+    template <class CharT, class Traits>
+    using out_stream_t = std::basic_ostream<CharT, Traits>;
+
+    template <class CharT, class Traits>
+    using stringbuffer_t = basic_unlockedbuf<std::basic_stringbuf<CharT, Traits>, CharT>;
+
+    template <class CharT, class Traits>
+    using buffer_t = basic_unlockedbuf<std::basic_streambuf<CharT, Traits>, CharT>;
+#endif
+
+}}} // namespace boost::detail::lcast
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_CONVERTER_LEXICAL_BASIC_UNLOCKEDBUF_HPP
+

include/boost/lexical_cast/detail/lcast_char_constants.hpp

@@ -0,0 +1,53 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_LCAST_CHAR_CONSTANTS_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_LCAST_CHAR_CONSTANTS_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+namespace boost
+{
+    namespace detail // '0', '-', '+', 'e', 'E' and '.' constants
+    {
+        template < typename Char >
+        struct lcast_char_constants {
+            // We check in tests assumption that static casted character is
+            // equal to correctly written C++ literal: U'0' == static_cast<char32_t>('0')
+            BOOST_STATIC_CONSTANT(Char, zero  = static_cast<Char>('0'));
+            BOOST_STATIC_CONSTANT(Char, minus = static_cast<Char>('-'));
+            BOOST_STATIC_CONSTANT(Char, plus = static_cast<Char>('+'));
+            BOOST_STATIC_CONSTANT(Char, lowercase_e = static_cast<Char>('e'));
+            BOOST_STATIC_CONSTANT(Char, capital_e = static_cast<Char>('E'));
+            BOOST_STATIC_CONSTANT(Char, c_decimal_separator = static_cast<Char>('.'));
+        };
+    }
+} // namespace boost
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_LCAST_CHAR_CONSTANTS_HPP
+

include/boost/lexical_cast/detail/lcast_precision.hpp

@@ -0,0 +1,95 @@
+// Copyright Alexander Nasonov & Paul A. Bristow 2006.
+
+// Use, modification and distribution are subject to the
+// Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+#define BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <climits>
+#include <ios>
+#include <limits>
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+namespace boost { namespace detail {
+
+// Calculate an argument to pass to std::ios_base::precision from
+// lexical_cast.
+template<class T>
+struct lcast_precision
+{
+    using limits = std::numeric_limits<T>;
+
+    static constexpr bool use_default_precision =
+            !limits::is_specialized || limits::is_exact
+        ;
+
+    static constexpr bool is_specialized_bin =
+            !use_default_precision &&
+            limits::radix == 2 && limits::digits > 0
+        ;
+
+    static constexpr bool is_specialized_dec =
+            !use_default_precision &&
+            limits::radix == 10 && limits::digits10 > 0
+        ;
+
+    static constexpr std::streamsize streamsize_max =
+            (std::numeric_limits<std::streamsize>::max)()
+        ;
+
+    static constexpr unsigned int precision_dec = limits::digits10 + 1U;
+
+    static_assert(!is_specialized_dec ||
+            precision_dec <= streamsize_max + 0UL
+        , "");
+
+    static constexpr unsigned long precision_bin =
+            2UL + limits::digits * 30103UL / 100000UL
+        ;
+
+    static_assert(!is_specialized_bin ||
+            (limits::digits + 0UL < ULONG_MAX / 30103UL &&
+            precision_bin > limits::digits10 + 0UL &&
+            precision_bin <= streamsize_max + 0UL)
+        , "");
+
+    static constexpr std::streamsize value =
+            is_specialized_bin ? precision_bin
+                               : is_specialized_dec ? precision_dec : 6
+        ;
+};
+
+template<class T>
+inline void lcast_set_precision(std::ios_base& stream, T*)
+{
+    stream.precision(lcast_precision<T>::value);
+}
+
+template<class Source, class Target>
+inline void lcast_set_precision(std::ios_base& stream, Source*, Target*)
+{
+    std::streamsize const s = lcast_precision<Source>::value;
+    std::streamsize const t = lcast_precision<Target*>::value;
+    stream.precision(s > t ? s : t);
+}
+
+}}
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif //  BOOST_DETAIL_LCAST_PRECISION_HPP_INCLUDED
+

include/boost/lexical_cast/detail/lcast_unsigned_converters.hpp

@@ -0,0 +1,308 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_LCAST_UNSIGNED_CONVERTERS_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_LCAST_UNSIGNED_CONVERTERS_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <climits>
+#include <cstddef>
+#include <string>
+#include <cstring>
+#include <cstdio>
+#include <type_traits>
+#include <boost/limits.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/lexical_cast/detail/type_traits.hpp>
+
+
+#ifndef BOOST_NO_STD_LOCALE
+#   include <locale>
+#else
+#   ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
+        // Getting error at this point means, that your STL library is old/lame/misconfigured.
+        // If nothing can be done with STL library, define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE,
+        // but beware: lexical_cast will understand only 'C' locale delimeters and thousands
+        // separators.
+#       error "Unable to use <locale> header. Define BOOST_LEXICAL_CAST_ASSUME_C_LOCALE to force "
+#       error "boost::lexical_cast to use only 'C' locale during conversions."
+#   endif
+#endif
+
+#include <boost/lexical_cast/detail/lcast_char_constants.hpp>
+#include <boost/core/noncopyable.hpp>
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+#include <boost/lexical_cast/detail/lcast_char_constants.hpp>
+
+namespace boost
+{
+    namespace detail // lcast_to_unsigned
+    {
+        template<class T>
+#if defined(__clang__) && (__clang_major__ > 3 || __clang_minor__ > 6)
+       __attribute__((no_sanitize("unsigned-integer-overflow")))
+#endif
+        inline
+        typename boost::detail::lcast::make_unsigned<T>::type lcast_to_unsigned(const T value) noexcept {
+            typedef typename boost::detail::lcast::make_unsigned<T>::type result_type;
+            return value < 0
+                ? static_cast<result_type>(0u - static_cast<result_type>(value))
+                : static_cast<result_type>(value);
+        }
+    }
+
+    namespace detail // lcast_put_unsigned
+    {
+        template <class Traits, class T, class CharT>
+        class lcast_put_unsigned: boost::noncopyable {
+            typedef typename Traits::int_type int_type;
+            typename std::conditional<
+                    (sizeof(unsigned) > sizeof(T))
+                    , unsigned
+                    , T
+            >::type         m_value;
+            CharT*          m_finish;
+            CharT    const  m_czero;
+            int_type const  m_zero;
+
+        public:
+            lcast_put_unsigned(const T n_param, CharT* finish) noexcept
+                : m_value(n_param), m_finish(finish)
+                , m_czero(lcast_char_constants<CharT>::zero), m_zero(Traits::to_int_type(m_czero))
+            {
+#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
+                static_assert(!std::numeric_limits<T>::is_signed, "");
+#endif
+            }
+
+            CharT* convert() {
+#ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
+                std::locale loc;
+                if (loc == std::locale::classic()) {
+                    return main_convert_loop();
+                }
+
+                typedef std::numpunct<CharT> numpunct;
+                numpunct const& np = BOOST_USE_FACET(numpunct, loc);
+                std::string const grouping = np.grouping();
+                std::string::size_type const grouping_size = grouping.size();
+
+                if (!grouping_size || grouping[0] <= 0) {
+                    return main_convert_loop();
+                }
+
+#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
+                // Check that ulimited group is unreachable:
+                static_assert(std::numeric_limits<T>::digits10 < CHAR_MAX, "");
+#endif
+                CharT const thousands_sep = np.thousands_sep();
+                std::string::size_type group = 0; // current group number
+                char last_grp_size = grouping[0];
+                char left = last_grp_size;
+
+                do {
+                    if (left == 0) {
+                        ++group;
+                        if (group < grouping_size) {
+                            char const grp_size = grouping[group];
+                            last_grp_size = (grp_size <= 0 ? static_cast<char>(CHAR_MAX) : grp_size);
+                        }
+
+                        left = last_grp_size;
+                        --m_finish;
+                        Traits::assign(*m_finish, thousands_sep);
+                    }
+
+                    --left;
+                } while (main_convert_iteration());
+
+                return m_finish;
+#else
+                return main_convert_loop();
+#endif
+            }
+
+        private:
+            inline bool main_convert_iteration() noexcept {
+                --m_finish;
+                int_type const digit = static_cast<int_type>(m_value % 10U);
+                Traits::assign(*m_finish, Traits::to_char_type(m_zero + digit));
+                m_value /= 10;
+                return !!m_value; // suppressing warnings
+            }
+
+            inline CharT* main_convert_loop() noexcept {
+                while (main_convert_iteration());
+                return m_finish;
+            }
+        };
+    }
+
+    namespace detail // lcast_ret_unsigned
+    {
+        template <class Traits, class T, class CharT>
+        class lcast_ret_unsigned: boost::noncopyable {
+            bool m_multiplier_overflowed;
+            T m_multiplier;
+            T& m_value;
+            const CharT* const m_begin;
+            const CharT* m_end;
+
+        public:
+            lcast_ret_unsigned(T& value, const CharT* const begin, const CharT* end) noexcept
+                : m_multiplier_overflowed(false), m_multiplier(1), m_value(value), m_begin(begin), m_end(end)
+            {
+#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
+                static_assert(!std::numeric_limits<T>::is_signed, "");
+
+                // GCC when used with flag -std=c++0x may not have std::numeric_limits
+                // specializations for __int128 and unsigned __int128 types.
+                // Try compilation with -std=gnu++0x or -std=gnu++11.
+                //
+                // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40856
+                static_assert(std::numeric_limits<T>::is_specialized,
+                    "std::numeric_limits are not specialized for integral type passed to boost::lexical_cast"
+                );
+#endif
+            }
+
+            inline bool convert() {
+                CharT const czero = lcast_char_constants<CharT>::zero;
+                --m_end;
+                m_value = static_cast<T>(0);
+
+                if (m_begin > m_end || *m_end < czero || *m_end >= czero + 10)
+                    return false;
+                m_value = static_cast<T>(*m_end - czero);
+                --m_end;
+
+#ifdef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
+                return main_convert_loop();
+#else
+                std::locale loc;
+                if (loc == std::locale::classic()) {
+                    return main_convert_loop();
+                }
+
+                typedef std::numpunct<CharT> numpunct;
+                numpunct const& np = BOOST_USE_FACET(numpunct, loc);
+                std::string const& grouping = np.grouping();
+                std::string::size_type const grouping_size = grouping.size();
+
+                /* According to Programming languages - C++
+                 * we MUST check for correct grouping
+                 */
+                if (!grouping_size || grouping[0] <= 0) {
+                    return main_convert_loop();
+                }
+
+                unsigned char current_grouping = 0;
+                CharT const thousands_sep = np.thousands_sep();
+                char remained = static_cast<char>(grouping[current_grouping] - 1);
+
+                for (;m_end >= m_begin; --m_end)
+                {
+                    if (remained) {
+                        if (!main_convert_iteration()) {
+                            return false;
+                        }
+                        --remained;
+                    } else {
+                        if ( !Traits::eq(*m_end, thousands_sep) ) //|| begin == end ) return false;
+                        {
+                            /*
+                             * According to Programming languages - C++
+                             * Digit grouping is checked. That is, the positions of discarded
+                             * separators is examined for consistency with
+                             * use_facet<numpunct<charT> >(loc ).grouping()
+                             *
+                             * BUT what if there is no separators at all and grouping()
+                             * is not empty? Well, we have no extraced separators, so we
+                             * won`t check them for consistency. This will allow us to
+                             * work with "C" locale from other locales
+                             */
+                            return main_convert_loop();
+                        } else {
+                            if (m_begin == m_end) return false;
+                            if (current_grouping < grouping_size - 1) ++current_grouping;
+                            remained = grouping[current_grouping];
+                        }
+                    }
+                } /*for*/
+
+                return true;
+#endif
+            }
+
+        private:
+            // Iteration that does not care about grouping/separators and assumes that all
+            // input characters are digits
+#if defined(__clang__) && (__clang_major__ > 3 || __clang_minor__ > 6)
+            __attribute__((no_sanitize("unsigned-integer-overflow")))
+#endif
+            inline bool main_convert_iteration() noexcept {
+                CharT const czero = lcast_char_constants<CharT>::zero;
+                T const maxv = (std::numeric_limits<T>::max)();
+
+                m_multiplier_overflowed = m_multiplier_overflowed || (maxv/10 < m_multiplier);
+                m_multiplier = static_cast<T>(m_multiplier * 10);
+
+                T const dig_value = static_cast<T>(*m_end - czero);
+                T const new_sub_value = static_cast<T>(m_multiplier * dig_value);
+
+                // We must correctly handle situations like `000000000000000000000000000001`.
+                // So we take care of overflow only if `dig_value` is not '0'.
+                if (*m_end < czero || *m_end >= czero + 10  // checking for correct digit
+                    || (dig_value && (                      // checking for overflow of ...
+                        m_multiplier_overflowed                             // ... multiplier
+                        || static_cast<T>(maxv / dig_value) < m_multiplier  // ... subvalue
+                        || static_cast<T>(maxv - new_sub_value) < m_value   // ... whole expression
+                    ))
+                ) return false;
+
+                m_value = static_cast<T>(m_value + new_sub_value);
+
+                return true;
+            }
+
+            bool main_convert_loop() noexcept {
+                for ( ; m_end >= m_begin; --m_end) {
+                    if (!main_convert_iteration()) {
+                        return false;
+                    }
+                }
+
+                return true;
+            }
+        };
+    }
+} // namespace boost
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_LCAST_UNSIGNED_CONVERTERS_HPP
+

include/boost/lexical_cast/detail/type_traits.hpp

@@ -0,0 +1,81 @@
+// Copyright Peter Dimov, 2025.
+// Copyright Romain Geissler, 2025.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_TYPE_TRAITS_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_TYPE_TRAITS_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <type_traits>
+
+namespace boost { namespace detail { namespace lcast {
+
+// libstdc++ from gcc <= 15 doesn't provide support for __int128 in the standard traits,
+// so define them explicitly.
+// This was fixed with gcc >= 16, so we may eventually remove this workaround and use
+// directly the standard type_traits.
+
+template<class T> struct is_integral: public std::is_integral<T>
+{
+};
+
+template<class T> struct is_signed: public std::is_signed<T>
+{
+};
+
+template<class T> struct is_unsigned: public std::is_unsigned<T>
+{
+};
+
+template<class T> struct make_unsigned: public std::make_unsigned<T>
+{
+};
+
+#if defined(__SIZEOF_INT128__)
+
+template<> struct is_integral<__int128_t>: public std::true_type
+{
+};
+
+template<> struct is_integral<__uint128_t>: public std::true_type
+{
+};
+
+template<> struct is_signed<__int128_t>: public std::true_type
+{
+};
+
+template<> struct is_signed<__uint128_t>: public std::false_type
+{
+};
+
+template<> struct is_unsigned<__int128_t>: public std::false_type
+{
+};
+
+template<> struct is_unsigned<__uint128_t>: public std::true_type
+{
+};
+
+template<> struct make_unsigned<__int128_t>
+{
+    typedef __uint128_t type;
+};
+
+template<> struct make_unsigned<__uint128_t>
+{
+    typedef __uint128_t type;
+};
+
+#endif
+
+}}}  // namespace boost::detail::lcast
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_TYPE_TRAITS_HPP

include/boost/lexical_cast/detail/widest_char.hpp

@@ -0,0 +1,49 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
+#define BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <type_traits>
+
+#endif  // #ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+namespace boost { namespace detail {
+
+template <typename TargetChar, typename SourceChar>
+using widest_char = std::conditional<
+    (sizeof(TargetChar) > sizeof(SourceChar))
+    , TargetChar
+    , SourceChar
+>;
+
+}} // namespace boost::detail
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_DETAIL_WIDEST_CHAR_HPP
+

include/boost/lexical_cast/try_lexical_convert.hpp

@@ -0,0 +1,105 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_TRY_LEXICAL_CONVERT_HPP
+#define BOOST_LEXICAL_CAST_TRY_LEXICAL_CONVERT_HPP
+
+#include <boost/lexical_cast/detail/config.hpp>
+
+#if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#ifndef BOOST_LEXICAL_CAST_INTERFACE_UNIT
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#include <type_traits>
+#endif
+
+#include <boost/lexical_cast/detail/buffer_view.hpp>
+#include <boost/lexical_cast/detail/is_character.hpp>
+#include <boost/lexical_cast/detail/converter_numeric.hpp>
+#include <boost/lexical_cast/detail/converter_lexical.hpp>
+
+namespace boost {
+    namespace detail
+    {
+        template<typename Target, typename Source>
+        using is_arithmetic_and_not_xchars = std::integral_constant<
+            bool,
+            !(boost::detail::is_character<Target>::value) &&
+                !(boost::detail::is_character<Source>::value) &&
+                std::is_arithmetic<Source>::value &&
+                std::is_arithmetic<Target>::value
+        >;
+    }
+
+    namespace conversion { namespace detail {
+
+BOOST_LEXICAL_CAST_BEGIN_MODULE_EXPORT
+
+        template <typename Target, typename Source>
+        inline bool try_lexical_convert(const Source& arg, Target& result)
+        {
+            static_assert(
+                !std::is_volatile<Source>::value,
+                "Boost.LexicalCast does not support volatile input");
+
+            typedef typename boost::detail::array_to_pointer_decay<Source>::type src;
+
+            typedef boost::detail::is_arithmetic_and_not_xchars<Target, src >
+                shall_we_copy_with_dynamic_check_t;
+
+            typedef typename std::conditional<
+                 shall_we_copy_with_dynamic_check_t::value,
+                 boost::detail::dynamic_num_converter_impl<Target, src >,
+                 boost::detail::lexical_converter_impl<Target, src >
+            >::type caster_type;
+
+            return caster_type::try_convert(arg, result);
+        }
+
+        template <typename Target, typename CharacterT>
+        inline bool try_lexical_convert(const CharacterT* chars, std::size_t count, Target& result)
+        {
+            static_assert(
+                boost::detail::is_character<CharacterT>::value,
+                "This overload of try_lexical_convert is meant to be used only with arrays of characters."
+            );
+            return ::boost::conversion::detail::try_lexical_convert(
+                ::boost::conversion::detail::make_buffer_view(chars, chars + count),
+                result
+            );
+        }
+BOOST_LEXICAL_CAST_END_MODULE_EXPORT
+
+    }} // namespace conversion::detail
+
+    namespace conversion {
+BOOST_LEXICAL_CAST_BEGIN_MODULE_EXPORT
+        // ADL barrier
+        using ::boost::conversion::detail::try_lexical_convert;
+BOOST_LEXICAL_CAST_END_MODULE_EXPORT
+    }
+
+} // namespace boost
+
+#endif  // #if !defined(BOOST_USE_MODULES) || defined(BOOST_LEXICAL_CAST_INTERFACE_UNIT)
+
+#endif // BOOST_LEXICAL_CAST_TRY_LEXICAL_CONVERT_HPP
+

index.html

@@ -1,38 +1,16 @@
+
+<!--
+Copyright 2005-2007 Daniel James.
+Distributed under the Boost Software License, Version 1.0. (See accompanying
+file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+-->
+
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-
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+    <meta http-equiv="refresh" content="0; URL=../../doc/html/boost_lexical_cast.html">
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-
-<h1><img border="0" src="../../boost.png" align="center" width="277" height="86">Boost
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-
-<p>The Conversion Library improves program safety and clarity by performing
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-  <li>The <a href="cast.htm">boost/cast</a> header provides <b>polymorphic_cast&lt;&gt;</b>
-    and <b>polymorphic_downcast&lt;&gt;</b> to perform safe casting between
-  polymorphic types.<br>
-  </li>
-  <li>The <a href="lexical_cast.htm">boost/lexical_cast</a> header provides <b>lexical_cast&lt;&gt;</b>
-    general literal text conversions, such as an <code>int</code> represented as
-    a <code>string</code>, or vice-versa.</li>
-</ul>
-<hr>
-<p>Revised <!--webbot bot="Timestamp" S-Type="EDITED"
-S-Format="%d %B, %Y" startspan -->June 23, 2005<!--webbot bot="Timestamp" endspan i-checksum="30348" -->
-</p>
-
+<body>
+Automatic redirection failed, please go to
+<a href="../../doc/html/boost_lexical_cast.html">../../doc/html/boost_lexical_cast.html</a>
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lexical_cast.htm

@@ -1,270 +0,0 @@
-<!-- saved from url=(0022)http://internet.e-mail -->
-<!doctype html public "-//W3C//DTD HTML Transitional 4.0//EN">
-<html>
-	<head>
-		<title>lexical_cast</title>
-		<meta name="author" content="Kevlin Henney, mailto:kevlin@curbralan.com">
-		<meta name="generator" content="Microsoft FrontPage 5.0">
-	</head>
-	<body bgcolor="#FFFFFF" text="#000000">
-		<h1><img src="../../boost.png" alt="boost.png (6897 bytes)" align="center" width="277" height="86">Header
-			<a href="../../boost/lexical_cast.hpp">boost/lexical_cast.hpp</a></h1>
-		<ul type="square">
-			<li>
-				<a href="#motivation">Motivation</a></li>
-			<li>
-				<a href="#examples">Examples</a></li>
-			<li>
-				<a href="#synopsis">Synopsis</a></li>
-			<li>
-				<a href="#lexical_cast"><code>lexical_cast</code></a></li>
-			<li>
-				<a href="#bad_lexical_cast"><code>bad_lexical_cast</code></a></li>
-			<li>
-				<a href="#faq">Frequently Asked Questions</a></li>
-			<li>
-				<a href="#references">References</a></li>
-			<li>
-				<a href="#changes">Changes</a></li>
-		</ul>
-		<hr>
-		<h2><a name="motivation">Motivation</a></h2>
-		Sometimes a value must be converted to a literal text form, such as an <code>int</code>
-		represented as a <code>string</code>, or vice-versa, when a <code>string</code> 
-		is interpreted as an <code>int</code>. Such examples are common when converting 
-		between data types internal to a program and representation external to a 
-		program, such as windows and configuration files.
-		<p>
-		The standard C and C++ libraries offer a number of facilities for performing 
-		such conversions. However, they vary with their ease of use, extensibility, and 
-		safety.
-		<p>
-			For instance, there are a number of limitations with the family of standard C 
-			functions typified by <code>atoi</code>:
-			<ul type="square">
-				<li>
-					Conversion is supported in one direction only: from text to internal data type. 
-					Converting the other way using the C library requires either the inconvenience 
-					and compromised safety of the <code>sprintf</code> function, or the loss of 
-					portability associated with non-standard functions such as <code>itoa</code>.
-				</li>
-				<li>
-					The range of types supported is only a subset of the built-in numeric types, 
-					namely <code>int</code>, <code>long</code>, and <code>double</code>.
-				</li>
-				<li>
-					The range of types cannot be extended in a uniform manner. For instance, 
-					conversion from string representation to <code>complex</code> or <code>rational</code>.
-				</li>
-			</ul>
-			The standard C functions typified by <code>strtol</code> have the same basic 
-			limitations, but offer finer control over the conversion process. However, for 
-			the common case such control is often either not required or not used. The <code>scanf</code>
-		family of functions offer even greater control, but also lack safety and ease 
-		of use.
-		<p>
-			The standard C++ library offers <code>stringstream</code> for the kind of 
-			in-core formatting being discussed. It offers a great deal of control over the 
-			formatting and conversion of I/O to and from arbitrary types through text. 
-			However, for simple conversions direct use of <code>stringstream</code> can be 
-			either clumsy (with the introduction of extra local variables and the loss of 
-			infix-expression convenience) or obscure (where <code>stringstream</code>
-		objects are created as temporary objects in an expression). Facets provide a 
-		comprehensive concept and facility for controlling textual representation, but 
-		their perceived complexity and high entry level requires an extreme degree of 
-		involvement for simple conversions, and excludes all but a few programmers.
-		<p>
-			The <code>lexical_cast</code> function template offers a convenient and 
-			consistent form for supporting common conversions to and from arbitrary types 
-			when they are represented as text. The simplification it offers is in 
-			expression-level convenience for such conversions. For more involved 
-			conversions, such as where precision or formatting need tighter control than is 
-			offered by the default behavior of <code>lexical_cast</code>, the conventional <code>
-				stringstream</code> approach is recommended. Where the conversions are 
-			numeric to numeric, <code><a href="../numeric/conversion/doc/numeric_cast.html">numeric_cast</a></code>
-			may offer more reasonable behavior than <code>lexical_cast</code>.
-		<p>
-			For a good discussion of the options and issues involved in string-based 
-			formatting, including comparison of <code>stringstream</code>, <code>lexical_cast</code>, 
-			and others, see Herb Sutter's article, <a href="http://www.gotw.ca/publications/mill19.htm">
-				<i>The String Formatters of Manor Farm</i></a>.
-		<p>
-			<hr>
-			<h2><a name="examples">Examples</a></h2>
-			The following example treats command line arguments as a sequence of numeric 
-			data: <blockquote>
-				<pre>int main(int argc, char * argv[])
-{
-    using boost::lexical_cast;
-    using boost::bad_lexical_cast;
-
-    std::vector&lt;short&gt; args;
-
-    while(*++argv)
-    {
-        try
-        {
-            args.push_back(lexical_cast&lt;short&gt;(*argv));
-        }
-        catch(bad_lexical_cast &amp;)
-        {
-            args.push_back(0);
-        }
-    }
-    ...
-}
-</pre>
-			</blockquote>The following example uses numeric data in a string expression: <blockquote>
-				<pre>void log_message(const std::string &amp;);
-
-void log_errno(int yoko)
-{
-    log_message(&quot;Error &quot; + boost::lexical_cast&lt;std::string&gt;(yoko) + &quot;: &quot; + strerror(yoko));
-}
-</pre>
-			</blockquote>
-			<hr>
-			<h2><a name="synopsis">Synopsis</a></h2>
-			Library features defined in <a href="../../boost/lexical_cast.hpp"><code>&quot;boost/lexical_cast.hpp&quot;</code></a>:
-			<blockquote>
-				<pre>namespace boost
-{
-    class <a href="#bad_lexical_cast">bad_lexical_cast</a>;
-    template&lt;typename Target, typename Source&gt;
-      Target <a href="#lexical_cast">lexical_cast</a>(const Source&amp; arg);
-}
-</pre>
-			</blockquote>Unit test defined in <a href="lexical_cast_test.cpp"><code>&quot;lexical_cast_test.cpp&quot;</code></a>.
-		<p>
-			<hr>
-			<h2><a name="lexical_cast"><code>lexical_cast</code></a></h2>
-			<blockquote>
-				<pre>template&lt;typename Target, typename Source&gt;
-  Target lexical_cast(const Source&amp; arg);
-</pre>
-			</blockquote>Returns the result of streaming <code>arg</code> into a
-			standard library string-based stream and then out as a <code>Target</code> object.
-			Where <code>Target</code> is either <code>std::string</code>
-			or <code>std::wstring</code>, stream extraction takes the whole content
-			of the string, including spaces, rather than relying on the default
-			<code>operator&gt;&gt;</code> behavior.
-			If the conversion is unsuccessful, a <a href="#bad_lexical_cast">
-				<code>bad_lexical_cast</code></a> exception is thrown.
-		<p>
-			The requirements on the argument and result types are:
-			<ul type="square">
-				<li>
-					<code>Source</code> is <i>OutputStreamable</i>, meaning that an <code>operator&lt;&lt;</code>
-					is defined that takes a <code>std::ostream</code> or <code>std::wostream</code> object on the
-					left hand side and an instance of the argument type on the right.
-				</li>
-				<li>
-					<code>Target</code> is <i>InputStreamable</i>, meaning that an <code>operator&gt;&gt;</code>
-					is defined that takes a <code>std::istream</code> or <code>std::wistream</code> object on the left hand side 
-					and an instance of the result type on the right.
-				</li>
-				<li>
-					<code>Target</code> is <i>CopyConstructible</i> [20.1.3].
-				</li>
-				<li>
-					<code>Target</code> is <i>DefaultConstructible</i>, meaning that it is possible 
-					to <i>default-initialize</i> an object of that type [8.5, 20.1.4].
-				</li>
-			</ul>
-			The character type of the underlying stream is assumed to be <code>char</code> unless
-			either the <code>Source</code> or the <code>Target</code> requires wide-character
-			streaming, in which case the underlying stream uses <code>wchar_t</code>.
-			<code>Source</code> types that require wide-character streaming are <code>wchar_t</code>,
-			<code>wchar_t *</code>, and <code>std::wstring</code>. <code>Target</code> types that
-			require wide-character streaming are <code>wchar_t</code> and <code>std::wstring</code>.
-			<p>
-			Where a higher degree of control is required over conversions, <code>std::stringstream</code>
-			and <code>std::wstringstream</code> offer a more appropriate path. Where non-stream-based conversions are 
-			required, <code>lexical_cast</code>
-		is the wrong tool for the job and is not special-cased for such scenarios.
-		<p>
-			<hr>
-			<h2><a name="bad_lexical_cast"><code>bad_lexical_cast</code></a></h2>
-			<blockquote>
-				<pre>class bad_lexical_cast : public std::bad_cast
-{
-public:
-    ... // <i>same member function interface as</i> std::exception
-};
-</pre>
-			</blockquote>Exception used to indicate runtime <a href="#lexical_cast"><code>lexical_cast</code></a>
-		failure.
-			<hr>
-		
-<h2><a name="faq">Frequently Asked Questions</h2>
-    <p> Q: Why does <code>lexical_cast&lt;int8_t&gt;("127")</code> throw <code>bad_lexical_cast</code>?
-    <br> A: The type <code>int8_t</code> is a typedef to <code>char</code> or <code>signed char</code>.
-    Lexical conversion to these types is simply reading a byte from source but since the source has
-    more than one byte, the exception is thrown.
-    <p>Please use other integer types such as <code>int</code> or <code>short int</code>. If bounds checking
-    is important, you can also call <a href="../../libs/numeric/conversion/doc/numeric_cast.html">numeric_cast</a>:
-
-<pre><a href="../../libs/numeric/conversion/doc/numeric_cast.html">numeric_cast</a>&lt;int8_t&gt;(lexical_cast&lt;int&gt;("127"));</pre>
-
-    <p> Q: What does <code>lexical_cast&lt;std::string&gt;</code> of an <code>int8_t</code> or <code>uint8_t</code> not do what I expect?
-    <br> A: As above, note that <code>int8_t</code> and <code>uint8_t</code> are actually chars and are formatted as such.  To avoid this, cast to an integer type first:
-
-<pre>lexical_cast&lt;std::string&gt;(static_cast&lt;int&gt;(n));</pre>
-
-    <p> Q: The implementation always resets the <code>ios_base::skipws</code> flag of an underlying stream object. It breaks my <code>operator&gt;&gt;</code> that works only in presence of this flag. Can you remove code that resets the flag?
-    <br> A: May be in a future version. There is no requirement in <a href="#n1973">[N1973]</a> to reset the flag but remember that <a href="#n1973">[N1973]</a> is not yet accepted by the committee. By the way, it's a great opportunity to make your <code>operator&gt;&gt;</code> conform to the standard. Read a good C++ book, study <code>std::sentry</code> and <a href="../../libs/io/doc/ios_state.html">ios_state_saver</a>.
-</ul>
-<h2><a name="references">References</h2>
-<ul type="square">
-    <a name="n1973"></a><li> [N1973] Kevlin Henney, Beman Dawes, Lexical Conversion Library Proposal for TR2,
-      <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1973.html">N1973</a>.
-      <a name="tuning"></a><li> [Tuning] Alexander Nasonov, Fine Tuning for lexical_cast,
-      <a href="http://www.accu.org/var/uploads/journals/overload74.pdf">Overload #74</a>,
-      August 2006.</li>
-</ul>
-<h2><a name="changes">Changes</a></h2>
-<h3>August, October 2006:</h3>
-<ul type="square">
-    <li>Better performance for many combinations of <code>Source</code> and <code>Target</code>
-    types. Refer to <a href="#tuning">[Tuning]</a> for more details.
-  </li>
-</ul>
-<h3>June 2005:</h3>
-<ul type="square">
-  <li>Call-by-const reference for the parameters. This requires partial specialization 
-    of class templates, so it doesn't work for MSVC 6, and it uses the original 
-    pass by value there.<br>
-  </li>
-  <li>The MSVC 6 support is deprecated, and will be removed in a future Boost 
-    version. </li>
-</ul>
-<h3>Earlier:</h3>
-	
-<ul type="square">
-  <li>The previous version of <code>lexical_cast</code> used the default stream 
-    precision for reading and writing floating-point numbers. For numerics that 
-    have a corresponding specialization of <code>std::numeric_limits</code>, the 
-    current version now chooses a precision to match. <br>
-  <li>The previous version of <code>lexical_cast</code> did not support conversion 
-    to or from any wide-character-based types. For compilers with full language 
-    and library support for wide characters, <code>lexical_cast</code> now supports 
-    conversions from <code>wchar_t</code>, <code>wchar_t *</code>, and <code>std::wstring</code> 
-    and to <code>wchar_t</code> and <code>std::wstring</code>. <br>
-  <li>The previous version of <code>lexical_cast</code> assumed that the conventional 
-    stream extractor operators were sufficient for reading values. However, string 
-    I/O is asymmetric, with the result that spaces play the role of I/O separators 
-    rather than string content. The current version fixes this error for <code>std::string</code> 
-    and, where supported, <code>std::wstring</code>: <code>lexical_cast&lt;std::string&gt;("Hello, 
-    World")</code> succeeds instead of failing with a <code>bad_lexical_cast</code> 
-    exception. <br>
-  <li>The previous version of <code>lexical_cast</code> allowed unsafe and meaningless 
-    conversions to pointers. The current version now throws a <code>bad_lexical_cast</code> 
-    for conversions to pointers: <code>lexical_cast&lt;char *&gt;("Goodbye, World")</code> 
-    now throws an exception instead of causing undefined behavior. 
-</ul>
-	<p>
-			<hr>
-			
-<div align="right"><small><i>&copy; Copyright Kevlin Henney, 2000&#150;2005</i></small></div>
-	</body>
-</html>

lexical_cast_test.cpp

@@ -1,751 +0,0 @@
-//  Unit test for boost::lexical_cast.
-//
-//  See http://www.boost.org for most recent version, including documentation.
-//
-//  Copyright Terje Slettebø and Kevlin Henney, 2005.
-//  Copyright Alexander Nasonov, 2006.
-//
-//  Distributed under the Boost
-//  Software License, Version 1.0. (See accompanying file
-//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
-//
-// Note: The unit test no longer compile on MSVC 6, but lexical_cast itself works for it.
-
-#include <boost/config.hpp>
-
-#if defined(__INTEL_COMPILER)
-#pragma warning(disable: 193 383 488 981 1418 1419)
-#elif defined(BOOST_MSVC)
-#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
-#endif
-
-#include <boost/lexical_cast.hpp>
-
-#include <boost/test/unit_test.hpp>
-#include <boost/test/floating_point_comparison.hpp>
-
-#include <string>
-#include <memory>
-
-#if defined(BOOST_NO_STRINGSTREAM) || \
-    defined(BOOST_NO_STD_WSTRING) || \
-    defined(BOOST_NO_STD_LOCALE)
-#define DISABLE_WIDE_CHAR_SUPPORT
-#endif
-
-#if (defined(BOOST_HAS_LONG_LONG) || defined(BOOST_HAS_MS_INT64)) \
-    && !(defined(BOOST_MSVC) && BOOST_MSVC < 1300)
-#define LCAST_TEST_LONGLONG
-#endif
-
-template<class CharT>
-struct my_traits : std::char_traits<CharT>
-{
-};
-
-template<class CharT>
-struct my_allocator : std::allocator<CharT>
-{
-};
-
-// Test all 65536 values if true:
-bool const lcast_test_small_integral_types_completely = false;
-
-// lcast_integral_test_counter: use when testing all values of an integral
-// types is not possible. Max. portable value is 32767.
-int const lcast_integral_test_counter=1000;
-
-using namespace boost;
-
-void test_conversion_to_char();
-void test_conversion_to_int();
-void test_conversion_to_double();
-void test_conversion_to_bool();
-void test_conversion_to_string();
-void test_conversion_from_to_wchar_t_alias();
-void test_conversion_to_pointer();
-void test_conversion_from_wchar_t();
-void test_conversion_to_wchar_t();
-void test_conversion_from_wstring();
-void test_conversion_to_wstring();
-void test_bad_lexical_cast();
-void test_no_whitespace_stripping();
-void test_conversion_from_to_short();
-void test_conversion_from_to_ushort();
-void test_conversion_from_to_int();
-void test_conversion_from_to_uint();
-void test_conversion_from_to_long();
-void test_conversion_from_to_ulong();
-#ifdef LCAST_TEST_LONGLONG
-void test_conversion_from_to_longlong();
-void test_conversion_from_to_ulonglong();
-#endif
-#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-void test_traits();
-void test_wtraits();
-void test_allocator();
-void test_wallocator();
-#endif
-
-unit_test::test_suite *init_unit_test_suite(int, char *[])
-{
-    unit_test_framework::test_suite *suite =
-        BOOST_TEST_SUITE("lexical_cast unit test");
-    suite->add(BOOST_TEST_CASE(test_conversion_to_char));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_int));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_double));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_bool));
-    suite->add(BOOST_TEST_CASE(test_conversion_from_to_wchar_t_alias));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_pointer));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_string));
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
-    suite->add(BOOST_TEST_CASE(test_conversion_from_wchar_t));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_wchar_t));
-    suite->add(BOOST_TEST_CASE(test_conversion_from_wstring));
-    suite->add(BOOST_TEST_CASE(test_conversion_to_wstring));
-    #endif
-    suite->add(BOOST_TEST_CASE(test_bad_lexical_cast));
-    suite->add(BOOST_TEST_CASE(test_no_whitespace_stripping));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_short));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ushort));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_int));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_uint));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ulong));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_long));
-    #ifdef LCAST_TEST_LONGLONG
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_longlong));
-    suite->add(BOOST_TEST_CASE(&test_conversion_from_to_ulonglong));
-    #endif
-    #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-    suite->add(BOOST_TEST_CASE(&test_traits));
-    suite->add(BOOST_TEST_CASE(&test_wtraits));
-    suite->add(BOOST_TEST_CASE(&test_allocator));
-    suite->add(BOOST_TEST_CASE(&test_wallocator));
-    #endif
-
-    return suite;
-}
-
-void test_conversion_to_char()
-{
-    BOOST_CHECK_EQUAL('A', lexical_cast<char>('A'));
-    BOOST_CHECK_EQUAL(' ', lexical_cast<char>(' '));
-    BOOST_CHECK_EQUAL('1', lexical_cast<char>(1));
-    BOOST_CHECK_EQUAL('0', lexical_cast<char>(0));
-    BOOST_CHECK_THROW(lexical_cast<char>(123), bad_lexical_cast);
-    BOOST_CHECK_EQUAL('1', lexical_cast<char>(1.0));
-    BOOST_CHECK_EQUAL('1', lexical_cast<char>(true));
-    BOOST_CHECK_EQUAL('0', lexical_cast<char>(false));
-    BOOST_CHECK_EQUAL('A', lexical_cast<char>("A"));
-    BOOST_CHECK_EQUAL(' ', lexical_cast<char>(" "));
-    BOOST_CHECK_THROW(lexical_cast<char>(""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<char>("Test"), bad_lexical_cast);
-    BOOST_CHECK_EQUAL('A', lexical_cast<char>(std::string("A")));
-    BOOST_CHECK_EQUAL(' ', lexical_cast<char>(std::string(" ")));
-    BOOST_CHECK_THROW(
-        lexical_cast<char>(std::string("")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<char>(std::string("Test")), bad_lexical_cast);
-}
-
-void test_conversion_to_int()
-{
-    BOOST_CHECK_EQUAL(1, lexical_cast<int>('1'));
-    BOOST_CHECK_EQUAL(0, lexical_cast<int>('0'));
-    BOOST_CHECK_THROW(lexical_cast<int>('A'), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(1, lexical_cast<int>(1));
-    BOOST_CHECK_EQUAL(1, lexical_cast<int>(1.0));
-
-    BOOST_CHECK_EQUAL(
-        (std::numeric_limits<int>::max)(),
-        lexical_cast<int>((std::numeric_limits<int>::max)()));
-
-    BOOST_CHECK_EQUAL(
-        (std::numeric_limits<int>::min)(),
-        lexical_cast<int>((std::numeric_limits<int>::min)()));
-
-    BOOST_CHECK_THROW(lexical_cast<int>(1.23), bad_lexical_cast);
-
-    BOOST_CHECK_THROW(lexical_cast<int>(1e20), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(1, lexical_cast<int>(true));
-    BOOST_CHECK_EQUAL(0, lexical_cast<int>(false));
-    BOOST_CHECK_EQUAL(123, lexical_cast<int>("123"));
-    BOOST_CHECK_THROW(
-        lexical_cast<int>(" 123"), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<int>(""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<int>("Test"), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(123, lexical_cast<int>("123"));
-    BOOST_CHECK_EQUAL(123, lexical_cast<int>(std::string("123")));
-    BOOST_CHECK_THROW(
-        lexical_cast<int>(std::string(" 123")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<int>(std::string("")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<int>(std::string("Test")), bad_lexical_cast);
-}
-
-void test_conversion_to_double()
-{
-    BOOST_CHECK_CLOSE(1.0, lexical_cast<double>('1'), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_THROW(lexical_cast<double>('A'), bad_lexical_cast);
-    BOOST_CHECK_CLOSE(1.0, lexical_cast<double>(1), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_CLOSE(1.23, lexical_cast<double>(1.23), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_CLOSE(1.234567890, 1.234567890, std::numeric_limits<double>::epsilon());
-    BOOST_CHECK_CLOSE(1.0, lexical_cast<double>(true), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_CLOSE(0.0, lexical_cast<double>(false), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_CLOSE(1.23, lexical_cast<double>("1.23"), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_THROW(lexical_cast<double>(""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<double>("Test"), bad_lexical_cast);
-    BOOST_CHECK_CLOSE(1.23, lexical_cast<double>(std::string("1.23")), (std::numeric_limits<double>::epsilon()));
-    BOOST_CHECK_THROW(
-        lexical_cast<double>(std::string("")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<double>(std::string("Test")), bad_lexical_cast);
-}
-
-void test_conversion_to_bool()
-{
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>('1'));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>('0'));
-    BOOST_CHECK_THROW(lexical_cast<bool>('A'), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(1));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(0));
-    BOOST_CHECK_THROW(lexical_cast<bool>(123), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(1.0));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(0.0));
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(true));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(false));
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>("1"));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>("0"));
-    BOOST_CHECK_THROW(lexical_cast<bool>(""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<bool>("Test"), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>("1"));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>("0"));
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(std::string("1")));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(std::string("0")));
-    BOOST_CHECK_THROW(
-        lexical_cast<bool>(std::string("")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<bool>(std::string("Test")), bad_lexical_cast);
-}
-
-void test_conversion_to_string()
-{
-    char buf[] = "hello";
-    char* str = buf;
-    BOOST_CHECK_EQUAL(str, lexical_cast<std::string>(str));
-    BOOST_CHECK_EQUAL("A", lexical_cast<std::string>('A'));
-    BOOST_CHECK_EQUAL(" ", lexical_cast<std::string>(' '));
-    BOOST_CHECK_EQUAL("123", lexical_cast<std::string>(123));
-    BOOST_CHECK_EQUAL("1.23", lexical_cast<std::string>(1.23));
-    BOOST_CHECK_EQUAL("1.111111111", lexical_cast<std::string>(1.111111111));
-    BOOST_CHECK_EQUAL("1", lexical_cast<std::string>(true));
-    BOOST_CHECK_EQUAL("0", lexical_cast<std::string>(false));
-    BOOST_CHECK_EQUAL("Test", lexical_cast<std::string>("Test"));
-    BOOST_CHECK_EQUAL(" ", lexical_cast<std::string>(" "));
-    BOOST_CHECK_EQUAL("", lexical_cast<std::string>(""));
-    BOOST_CHECK_EQUAL("Test", lexical_cast<std::string>(std::string("Test")));
-    BOOST_CHECK_EQUAL(" ", lexical_cast<std::string>(std::string(" ")));
-    BOOST_CHECK_EQUAL("", lexical_cast<std::string>(std::string("")));
-}
-
-void test_conversion_from_to_wchar_t_alias()
-{
-    BOOST_CHECK_EQUAL(123u, lexical_cast<unsigned short>("123"));
-    BOOST_CHECK_EQUAL(123u, lexical_cast<unsigned int>("123"));
-    BOOST_CHECK_EQUAL(123u, lexical_cast<unsigned long>("123"));
-    BOOST_CHECK_EQUAL(std::string("123"),
-        lexical_cast<std::string>(static_cast<unsigned short>(123)));
-    BOOST_CHECK_EQUAL(std::string("123"), lexical_cast<std::string>(123u));
-    BOOST_CHECK_EQUAL(std::string("123"), lexical_cast<std::string>(123ul));
-}
-
-void test_conversion_to_pointer()
-{
-    BOOST_CHECK_THROW(lexical_cast<char *>("Test"), bad_lexical_cast);
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
-    BOOST_CHECK_THROW(lexical_cast<wchar_t *>("Test"), bad_lexical_cast);
-    #endif
-}
-
-void test_conversion_from_wchar_t()
-{
-#ifndef DISABLE_WIDE_CHAR_SUPPORT
-#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    BOOST_CHECK_EQUAL(1, lexical_cast<int>(L'1'));
-    BOOST_CHECK_THROW(lexical_cast<int>(L'A'), bad_lexical_cast);
-#endif
-
-    BOOST_CHECK_EQUAL(123, lexical_cast<int>(L"123"));
-    BOOST_CHECK_THROW(lexical_cast<int>(L""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<int>(L"Test"), bad_lexical_cast);
-
-#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    BOOST_CHECK_EQUAL(1.0, lexical_cast<double>(L'1'));
-    BOOST_CHECK_THROW(lexical_cast<double>(L'A'), bad_lexical_cast);
-#endif
-
-    BOOST_CHECK_EQUAL(1.23, lexical_cast<double>(L"1.23"));
-    BOOST_CHECK_THROW(lexical_cast<double>(L""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<double>(L"Test"), bad_lexical_cast);
-
-#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(L'1'));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(L'0'));
-    BOOST_CHECK_THROW(lexical_cast<bool>(L'A'), bad_lexical_cast);
-#endif
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(L"1"));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(L"0"));
-    BOOST_CHECK_THROW(lexical_cast<bool>(L""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<bool>(L"Test"), bad_lexical_cast);
-#endif
-}
-
-void test_conversion_to_wchar_t()
-{
-#if !defined(DISABLE_WIDE_CHAR_SUPPORT) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>(1));
-    BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>(0));
-    BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>('1'));
-    BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>('0'));
-    BOOST_CHECK_THROW(lexical_cast<wchar_t>(123), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>(1.0));
-    BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>(0.0));
-    BOOST_CHECK_EQUAL(L'1', lexical_cast<wchar_t>(true));
-    BOOST_CHECK_EQUAL(L'0', lexical_cast<wchar_t>(false));
-    BOOST_CHECK_EQUAL(L'A', lexical_cast<wchar_t>(L'A'));
-    BOOST_CHECK_EQUAL(L' ', lexical_cast<wchar_t>(L' '));
-    BOOST_CHECK_EQUAL(L'A', lexical_cast<wchar_t>(L"A"));
-    BOOST_CHECK_EQUAL(L' ', lexical_cast<wchar_t>(L" "));
-    BOOST_CHECK_THROW(lexical_cast<wchar_t>(L""), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<wchar_t>(L"Test"), bad_lexical_cast);
-    BOOST_CHECK_EQUAL(L'A', lexical_cast<wchar_t>(std::wstring(L"A")));
-    BOOST_CHECK_EQUAL(L' ', lexical_cast<wchar_t>(std::wstring(L" ")));
-    BOOST_CHECK_THROW(
-        lexical_cast<wchar_t>(std::wstring(L"")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<wchar_t>(std::wstring(L"Test")), bad_lexical_cast);
-    #endif
-}
-
-void test_conversion_from_wstring()
-{
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
-    BOOST_CHECK_EQUAL(123, lexical_cast<int>(std::wstring(L"123")));
-    BOOST_CHECK_THROW(
-        lexical_cast<int>(std::wstring(L"")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<int>(std::wstring(L"Test")), bad_lexical_cast);
-
-    BOOST_CHECK_EQUAL(true, lexical_cast<bool>(std::wstring(L"1")));
-    BOOST_CHECK_EQUAL(false, lexical_cast<bool>(std::wstring(L"0")));
-    BOOST_CHECK_THROW(
-        lexical_cast<bool>(std::wstring(L"")), bad_lexical_cast);
-    BOOST_CHECK_THROW(
-        lexical_cast<bool>(std::wstring(L"Test")), bad_lexical_cast);
-    #endif
-}
-
-void test_conversion_to_wstring()
-{
-    #ifndef DISABLE_WIDE_CHAR_SUPPORT
-    wchar_t buf[] = L"hello";
-    wchar_t* str = buf;
-    BOOST_CHECK(str == lexical_cast<std::wstring>(str));
-    BOOST_CHECK(L"123" == lexical_cast<std::wstring>(123));
-    BOOST_CHECK(L"1.23" == lexical_cast<std::wstring>(1.23));
-    BOOST_CHECK(L"1.111111111" == lexical_cast<std::wstring>(1.111111111));
-    BOOST_CHECK(L"1" == lexical_cast<std::wstring>(true));
-    BOOST_CHECK(L"0" == lexical_cast<std::wstring>(false));
-#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    BOOST_CHECK(L"A" == lexical_cast<std::wstring>(L'A'));
-    BOOST_CHECK(L" " == lexical_cast<std::wstring>(L' '));
-    BOOST_CHECK(L"A" == lexical_cast<std::wstring>('A'));
-#endif
-    BOOST_CHECK(L"Test" == lexical_cast<std::wstring>(L"Test"));
-    BOOST_CHECK(L" " == lexical_cast<std::wstring>(L" "));
-    BOOST_CHECK(L"" == lexical_cast<std::wstring>(L""));
-    BOOST_CHECK(L"Test" == lexical_cast<std::wstring>(std::wstring(L"Test")));
-    BOOST_CHECK(L" " == lexical_cast<std::wstring>(std::wstring(L" ")));
-    BOOST_CHECK(L"" == lexical_cast<std::wstring>(std::wstring(L"")));
-    #endif
-}
-
-void test_bad_lexical_cast()
-{
-    try
-    {
-        lexical_cast<int>(std::string("Test"));
-
-        BOOST_CHECK(false); // Exception expected
-    }
-    catch(const bad_lexical_cast &e)
-    {
-        BOOST_CHECK(e.source_type() == typeid(std::string));
-        BOOST_CHECK(e.target_type() == typeid(int));
-    }
-}
-
-void test_no_whitespace_stripping()
-{
-    BOOST_CHECK_THROW(lexical_cast<int>(" 123"), bad_lexical_cast);
-    BOOST_CHECK_THROW(lexical_cast<int>("123 "), bad_lexical_cast);
-}
-
-// Replace "-,999" with "-999".
-template<class CharT>
-std::basic_string<CharT> to_str_gcc_workaround(std::basic_string<CharT> str)
-{
-    std::locale loc;
-    std::numpunct<CharT> const& np = BOOST_USE_FACET(std::numpunct<CharT>, loc);
-    std::ctype<CharT> const& ct = BOOST_USE_FACET(std::ctype<CharT>, loc);
-
-    if(np.grouping().empty())
-        return str;
-
-    CharT prefix[3] = { ct.widen('-'), np.thousands_sep(), CharT() };
-
-    if(str.find(prefix) != 0)
-        return str;
-
-    prefix[1] = CharT();
-    str.replace(0, 2, prefix);
-    return str;
-}
-
-template<class CharT, class T>
-std::basic_string<CharT> to_str(T t)
-{
-    std::basic_ostringstream<CharT> o;
-    o << t;
-    return to_str_gcc_workaround(o.str());
-}
-
-template<class T, class CharT>
-void test_conversion_from_integral_to_char(CharT zero)
-{
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(0)) == zero + 0);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(1)) == zero + 1);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(2)) == zero + 2);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(3)) == zero + 3);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(4)) == zero + 4);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(5)) == zero + 5);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(6)) == zero + 6);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(7)) == zero + 7);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(8)) == zero + 8);
-    BOOST_CHECK(lexical_cast<CharT>(static_cast<T>(9)) == zero + 9);
-
-    BOOST_CHECK_THROW(lexical_cast<CharT>(static_cast<T>(10)), bad_lexical_cast);
-
-    T t = (std::numeric_limits<T>::max)();
-    BOOST_CHECK_THROW(lexical_cast<CharT>(t), bad_lexical_cast);
-}
-
-template<class T>
-void test_conversion_from_integral_to_integral()
-{
-    T t = 0;
-    BOOST_CHECK(lexical_cast<T>(t) == t);
-
-    // Next two variables are used to supress warnings.
-    int st = 32767; unsigned int ut = st;
-    t = st;
-    BOOST_CHECK(lexical_cast<short>(t) == st);
-    BOOST_CHECK(lexical_cast<unsigned short>(t) == ut);
-    BOOST_CHECK(lexical_cast<int>(t) == st);
-    BOOST_CHECK(lexical_cast<unsigned int>(t) == ut);
-    BOOST_CHECK(lexical_cast<long>(t) == st);
-    BOOST_CHECK(lexical_cast<unsigned long>(t) == ut);
-
-    t = (std::numeric_limits<T>::max)();
-    BOOST_CHECK(lexical_cast<T>(t) == t);
-
-    t = (std::numeric_limits<T>::min)();
-    BOOST_CHECK(lexical_cast<T>(t) == t);
-}
-
-template<class T, class CharT>
-void test_conversion_from_integral_to_string(CharT)
-{
-    typedef std::numeric_limits<T> limits;
-    typedef std::basic_string<CharT> string_type;
-
-    T t;
-
-    t = (limits::min)();
-    BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-
-    t = (limits::max)();
-    BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-
-    if(limits::digits <= 16 && lcast_test_small_integral_types_completely)
-        // min and max have already been tested.
-        for(t = 1 + (limits::min)(); t != (limits::max)(); ++t)
-            BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-    else
-    {
-        T const min_val = (limits::min)();
-        T const max_val = (limits::max)();
-        T const half_max_val = max_val / 2;
-        T const cnt = lcast_integral_test_counter; // to supress warnings
-        unsigned int const counter = cnt < half_max_val ? cnt : half_max_val;
-
-        unsigned int i;
-
-        // Test values around min:
-        t = min_val;
-        for(i = 0; i < counter; ++i, ++t)
-            BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-
-        // Test values around max:
-        t = max_val;
-        for(i = 0; i < counter; ++i, --t)
-            BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-
-        // Test values around zero:
-        if(limits::is_signed)
-            for(t = -counter; t < static_cast<T>(counter); ++t)
-                BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-
-        // Test values around 100, 1000, 10000, ...
-        T ten_power = 100;
-        for(int e = 2; e <= limits::digits10; ++e, ten_power *= 10)
-        {
-            // ten_power + 100 probably never overflows
-            for(t = ten_power - 100; t != ten_power + 100; ++t)
-                BOOST_CHECK(lexical_cast<string_type>(t) == to_str<CharT>(t));
-        }
-    }
-}
-
-template<class T, class CharT>
-void test_conversion_from_string_to_integral(CharT)
-{
-    typedef std::numeric_limits<T> limits;
-
-    T t;
-
-    t = (limits::min)();
-    BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-
-    t = (limits::max)();
-    BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-
-    if(limits::digits <= 16 && lcast_test_small_integral_types_completely)
-        // min and max have already been tested.
-        for(t = 1 + (limits::min)(); t != (limits::max)(); ++t)
-            BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-    else
-    {
-        T const min_val = (limits::min)();
-        T const max_val = (limits::max)();
-        T const half_max_val = max_val / 2;
-        T const cnt = lcast_integral_test_counter; // to supress warnings
-        unsigned int const counter = cnt < half_max_val ? cnt : half_max_val;
-
-        unsigned int i;
-
-        // Test values around min:
-        t = min_val;
-        for(i = 0; i < counter; ++i, ++t)
-            BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-
-        // Test values around max:
-        t = max_val;
-        for(i = 0; i < counter; ++i, --t)
-            BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-
-        // Test values around zero:
-        if(limits::is_signed)
-            for(t = -counter; t < static_cast<T>(counter); ++t)
-                BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-
-        // Test values around 100, 1000, 10000, ...
-        T ten_power = 100;
-        for(int e = 2; e <= limits::digits10; ++e, ten_power *= 10)
-        {
-            // ten_power + 100 probably never overflows
-            for(t = ten_power - 100; t != ten_power + 100; ++t)
-                BOOST_CHECK(lexical_cast<T>(to_str<CharT>(t)) == t);
-        }
-    }
-}
-
-template<class T>
-void test_conversion_from_to_integral_for_locale()
-{
-    test_conversion_from_integral_to_integral<T>();
-    test_conversion_from_integral_to_string<T>('0');
-    test_conversion_from_string_to_integral<T>('0');
-#if !defined(DISABLE_WIDE_CHAR_SUPPORT) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    test_conversion_from_integral_to_string<T>(L'0');
-    test_conversion_from_string_to_integral<T>(L'0');
-#endif
-}
-
-struct restore_oldloc
-{
-    std::locale oldloc;
-    ~restore_oldloc() { std::locale::global(oldloc); }
-};
-
-template<class T>
-void test_conversion_from_to_integral()
-{
-    char const zero = '0';
-    signed char const szero = '0';
-    unsigned char const uzero = '0';
-    test_conversion_from_integral_to_char<T>(zero);
-    test_conversion_from_integral_to_char<T>(szero);
-    test_conversion_from_integral_to_char<T>(uzero);
-#if !defined(DISABLE_WIDE_CHAR_SUPPORT) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
-    wchar_t const wzero = L'0';
-    test_conversion_from_integral_to_char<T>(wzero);
-#endif
-
-    // test_conversion_from_to_integral_for_locale
-
-    typedef std::numpunct<char> numpunct;
-
-    restore_oldloc guard;
-    std::locale const& oldloc = guard.oldloc;
-
-    std::string grouping1 = BOOST_USE_FACET(numpunct, oldloc).grouping();
-    std::string grouping2(grouping1);
-
-    test_conversion_from_to_integral_for_locale<T>();
-
-    try
-    {
-        std::locale newloc("");
-        std::locale::global(newloc);
-
-        grouping2 = BOOST_USE_FACET(numpunct, newloc).grouping();
-    }
-    catch(std::exception const& ex)
-    {
-        std::string msg("Failed to set system locale: ");
-        msg += ex.what();
-        BOOST_TEST_MESSAGE(msg);
-    }
-
-    if(grouping1 != grouping2)
-        test_conversion_from_to_integral_for_locale<T>();
-
-    if(grouping1.empty() && grouping2.empty())
-        BOOST_TEST_MESSAGE("Formatting with thousands_sep has not been tested");
-}
-
-void test_conversion_from_to_short()
-{
-    test_conversion_from_to_integral<short>();
-}
-
-void test_conversion_from_to_ushort()
-{
-    test_conversion_from_to_integral<unsigned short>();
-}
-
-void test_conversion_from_to_int()
-{
-    test_conversion_from_to_integral<int>();
-}
-
-void test_conversion_from_to_uint()
-{
-    test_conversion_from_to_integral<unsigned int>();
-}
-
-void test_conversion_from_to_ulong()
-{
-    test_conversion_from_to_integral<unsigned long>();
-}
-
-void test_conversion_from_to_long()
-{
-    test_conversion_from_to_integral<long>();
-}
-
-#if defined(BOOST_HAS_LONG_LONG)
-
-void test_conversion_from_to_longlong()
-{
-    test_conversion_from_to_integral<boost::long_long_type>();
-}
-
-void test_conversion_from_to_ulonglong()
-{
-    test_conversion_from_to_integral<boost::ulong_long_type>();
-}
-
-#elif defined(LCAST_TEST_LONGLONG)
-
-void test_conversion_from_to_longlong()
-{
-    test_conversion_from_to_integral<__int64>();
-}
-
-void test_conversion_from_to_ulonglong()
-{
-    test_conversion_from_to_integral<unsigned __int64>();
-}
-
-#endif
-
-#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-void test_traits()
-{
-    typedef std::basic_string<char, my_traits<char> > my_string;
-
-    my_string const s("s");
-    BOOST_CHECK(boost::lexical_cast<char>(s) == s[0]);
-    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
-    BOOST_CHECK(boost::lexical_cast<my_string>(-1) == "-1");
-}
-
-void test_wtraits()
-{
-    typedef std::basic_string<wchar_t, my_traits<wchar_t> > my_string;
-
-    my_string const s(L"s");
-    BOOST_CHECK(boost::lexical_cast<wchar_t>(s) == s[0]);
-    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
-    //BOOST_CHECK(boost::lexical_cast<my_string>(-1) == L"-1");
-    // Commented out because gcc 3.3 doesn't support this:
-    // basic_ostream<wchar_t, my_traits<wchar_t> > o; o << -1;
-}
-
-void test_allocator()
-{
-    typedef std::basic_string< char
-                             , std::char_traits<char>
-                             , my_allocator<char>
-                             > my_string;
-
-    my_string s("s");
-    BOOST_CHECK(boost::lexical_cast<char>(s) == s[0]);
-    BOOST_CHECK(boost::lexical_cast<std::string>(s) == "s");
-    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
-    BOOST_CHECK(boost::lexical_cast<my_string>(1) == "1");
-    BOOST_CHECK(boost::lexical_cast<my_string>("s") == s);
-    BOOST_CHECK(boost::lexical_cast<my_string>(std::string("s")) == s);
-}
-
-void test_wallocator()
-{
-    typedef std::basic_string< wchar_t
-                             , std::char_traits<wchar_t>
-                             , my_allocator<wchar_t>
-                             > my_string;
-
-    my_string s(L"s");
-    BOOST_CHECK(boost::lexical_cast<wchar_t>(s) == s[0]);
-    BOOST_CHECK(boost::lexical_cast<std::wstring>(s) == L"s");
-    BOOST_CHECK(boost::lexical_cast<my_string>(s) == s);
-    BOOST_CHECK(boost::lexical_cast<my_string>(1) == L"1");
-    BOOST_CHECK(boost::lexical_cast<my_string>(L"s") == s);
-    BOOST_CHECK(boost::lexical_cast<my_string>(std::wstring(L"s")) == s);
-}
-
-#endif
-

meta/libraries.json

@@ -0,0 +1,16 @@
+{
+    "key": "lexical_cast",
+    "name": "Lexical Cast",
+    "authors": [
+        "Kevlin Henney"
+    ],
+    "description": "General literal text conversions, such as an int represented a string, or vice-versa.",
+    "category": [
+        "Miscellaneous",
+        "String"
+    ],
+    "maintainers": [
+        "Antony Polukhin <antoshkka -at- gmail.com>"
+    ],
+    "cxxstd": "11"
+}

modules/boost_lexical_cast.cppm

@@ -0,0 +1,57 @@
+// Copyright (c) 2016-2025 Antony Polukhin
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// To compile manually use a command like the folowing:
+// clang++ -I ../include -std=c++20 --precompile -x c++-module boost_lexical_cast.cppm
+
+module;
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/config/workaround.hpp>
+#include <boost/container/container_fwd.hpp>
+#include <boost/core/cmath.hpp>
+#include <boost/core/noncopyable.hpp>
+#include <boost/core/snprintf.hpp>
+#include <boost/limits.hpp>
+#include <boost/throw_exception.hpp>
+
+#include <boost/detail/basic_pointerbuf.hpp>
+
+#ifndef BOOST_LEXICAL_CAST_USE_STD_MODULE
+#include <array>
+#include <climits>
+#include <cstddef>
+#include <cstdio>
+#include <cstring>
+#ifndef BOOST_NO_CWCHAR
+#   include <cwchar>
+#endif
+#include <exception>
+#include <iosfwd>
+#include <istream>
+#ifndef BOOST_NO_STD_LOCALE
+#   include <locale>
+#endif
+#include <sstream>
+#include <string>
+#include <string_view>
+#include <typeinfo>
+#include <type_traits>
+#endif
+
+#define BOOST_LEXICAL_CAST_INTERFACE_UNIT
+
+export module boost.lexical_cast;
+
+#ifdef BOOST_LEXICAL_CAST_USE_STD_MODULE
+import std;
+#endif
+
+#ifdef __clang__
+#   pragma clang diagnostic ignored "-Winclude-angled-in-module-purview"
+#endif
+
+#include <boost/lexical_cast.hpp>

modules/usage_sample.cpp

@@ -0,0 +1,16 @@
+// Copyright (c) 2024-2025 Antony Polukhin
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// To compile manually use a command like the following:
+// clang++ -std=c++20 -fmodule-file=lexical_cast.pcm lexical_cast.pcm usage_sample.cpp
+
+//[lexical_cast_module_example
+import boost.lexical_cast;
+
+int main() {
+    return boost::lexical_cast<int>("0");
+}
+//]
+

numeric_cast_test.cpp

@@ -1,100 +0,0 @@
-//  boost utility cast test program  -----------------------------------------//
-
-//  (C) Copyright Beman Dawes, Dave Abrahams 1999. Distributed under the Boost
-//  Software License, Version 1.0. (See accompanying file
-//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-
-//  See http://www.boost.org for most recent version including documentation.
-
-//  Revision History
-//   28 Set 04  factored out numeric_cast<> test (Fernando Cacciola)
-//   20 Jan 01  removed use of <limits> for portability to raw GCC (David Abrahams)
-//   28 Jun 00  implicit_cast removed (Beman Dawes)
-//   30 Aug 99  value_cast replaced by numeric_cast
-//    3 Aug 99  Initial Version
-
-#include <iostream>
-#include <climits>
-#include <cfloat>   // for DBL_MAX (Peter Schmid)
-#include <boost/cast.hpp>
-
-#include "boost/test/minimal.hpp"
-
-#  if SCHAR_MAX == LONG_MAX
-#      error "This test program doesn't work if SCHAR_MAX == LONG_MAX"
-#  endif
-
-using namespace boost;
-using std::cout;
-
-
-int test_main( int argc, char * argv[] )
-{
-
-#   ifdef NDEBUG
-        cout << "NDEBUG is defined\n";
-#   else
-        cout << "NDEBUG is not defined\n";
-#   endif
-
-    cout << "\nBeginning tests...\n";
-
-//  test implicit_cast and numeric_cast  -------------------------------------//
-
-    //  tests which should succeed
-    long small_value = 1;
-    long small_negative_value = -1;
-    long large_value = LONG_MAX;
-    long large_negative_value = LONG_MIN;
-    signed char c = 0;
-
-    c = large_value;  // see if compiler generates warning
-
-    c = numeric_cast<signed char>( small_value );
-    BOOST_CHECK( c == 1 );
-    c = 0;
-    c = numeric_cast<signed char>( small_value );
-    BOOST_CHECK( c == 1 );
-    c = 0;
-    c = numeric_cast<signed char>( small_negative_value );
-    BOOST_CHECK( c == -1 );
-
-    // These tests courtesy of Joe R NWP Swatosh<joe.r.swatosh@usace.army.mil>
-    BOOST_CHECK( 0.0f == numeric_cast<float>( 0.0 ) );
-    BOOST_CHECK( 0.0 == numeric_cast<double>( 0.0 ) );
-
-    //  tests which should result in errors being detected
-
-    bool caught_exception = false;
-    try { c = numeric_cast<signed char>( large_value ); }
-    catch (bad_numeric_cast)
-        { cout<<"caught bad_numeric_cast #1\n"; caught_exception = true; }
-    BOOST_CHECK ( caught_exception );
-
-    caught_exception = false;
-    try { c = numeric_cast<signed char>( large_negative_value ); }
-    catch (bad_numeric_cast)
-        { cout<<"caught bad_numeric_cast #2\n"; caught_exception = true; }
-    BOOST_CHECK ( caught_exception );
-
-    unsigned long ul;
-    caught_exception = false;
-    try { ul = numeric_cast<unsigned long>( large_negative_value ); }
-    catch (bad_numeric_cast)
-        { cout<<"caught bad_numeric_cast #3\n"; caught_exception = true; }
-    BOOST_CHECK ( caught_exception );
-
-    caught_exception = false;
-    try { ul = numeric_cast<unsigned long>( small_negative_value ); }
-    catch (bad_numeric_cast)
-        { cout<<"caught bad_numeric_cast #4\n"; caught_exception = true; }
-    BOOST_CHECK ( caught_exception );
-
-    caught_exception = false;
-    try { numeric_cast<int>( DBL_MAX ); }
-    catch (bad_numeric_cast)
-        { cout<<"caught bad_numeric_cast #5\n"; caught_exception = true; }
-    BOOST_CHECK ( caught_exception );
-
-    return 0 ;
-}

perf/Jamfile.v2

@@ -0,0 +1,29 @@
+#==============================================================================
+#   Copyright Antony Polukhin, 2012-2026.
+#
+#   Distributed under the Boost Software License, Version 1.0. (See accompanying
+#   file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#==============================================================================
+
+# performance tests
+import testing ;
+import path ;
+
+path-constant TEST_DIR : . ;
+
+project performance/test
+    : source-location ./
+    : requirements
+#      <library>/boost/chrono//boost_chrono
+#      <library>/boost/system//boost_system
+      <link>static
+      <target-os>freebsd:<linkflags>"-lrt"
+      <target-os>linux:<linkflags>"-lrt"
+      <toolset>gcc:<cxxflags>-fvisibility=hidden
+      <toolset>intel-linux:<cxxflags>-fvisibility=hidden
+      <toolset>sun:<cxxflags>-xldscope=hidden
+    : default-build release
+ ;
+
+run performance_test.cpp : $(TEST_DIR) ;
+

perf/performance_test.cpp

@@ -0,0 +1,393 @@
+//  (C) Copyright Antony Polukhin, 2012-2026.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/config for most recent version.
+
+//
+// Testing lexical_cast<> performance
+//
+
+#define BOOST_ERROR_CODE_HEADER_ONLY
+#define BOOST_CHRONO_HEADER_ONLY
+
+#include <boost/lexical_cast.hpp>
+
+#include <fstream>
+#include <cstring>
+#include <string_view>
+#include <type_traits>
+
+#include <boost/array.hpp>
+#include <boost/chrono.hpp>
+#include <boost/container/string.hpp>
+#include <boost/range/iterator_range.hpp>
+
+// File to output data
+std::fstream fout;
+
+namespace boost {
+inline std::istream& operator>> (std::istream& in, boost::array<char,50>& res) {
+    in >> res.begin();
+    return in;
+}
+}
+
+template <class OutT, class InT>
+static inline void test_lexical(const InT& in_val) {
+    OutT out_val = boost::lexical_cast<OutT>(in_val);
+    (void)out_val;
+}
+
+template <class OutT, class InT>
+static inline void test_ss_constr(const InT& in_val) {
+    OutT out_val;
+    std::stringstream ss;
+    ss << in_val;
+    if (ss.fail()) throw std::logic_error("descr");
+    ss >> out_val;
+    if (ss.fail()) throw std::logic_error("descr");
+}
+
+template <class OutT, class CharT, std::size_t N>
+static inline void test_ss_constr(const boost::array<CharT, N>& in_val) {
+    OutT out_val;
+    std::stringstream ss;
+    ss << in_val.begin();
+    if (ss.fail()) throw std::logic_error("descr");
+    ss >> out_val;
+    if (ss.fail()) throw std::logic_error("descr");
+}
+
+template <class OutT, class StringStreamT, class CharT, std::size_t N>
+static inline void test_ss_noconstr(StringStreamT& ss, const boost::array<CharT, N>& in_val) {
+    OutT out_val;
+    ss << in_val.begin(); // ss is an instance of std::stringstream
+    if (ss.fail()) throw std::logic_error("descr");
+    ss >> out_val;
+    if (ss.fail()) throw std::logic_error("descr");
+    /* reseting std::stringstream to use it again */
+    ss.str(std::string());
+    ss.clear();
+}
+
+template <class OutT, class StringStreamT, class InT>
+static inline void test_ss_noconstr(StringStreamT& ss, const InT& in_val) {
+    OutT out_val;
+    ss << in_val; // ss is an instance of std::stringstream
+    if (ss.fail()) throw std::logic_error("descr");
+    ss >> out_val;
+    if (ss.fail()) throw std::logic_error("descr");
+    /* reseting std::stringstream to use it again */
+    ss.str(std::string());
+    ss.clear();
+}
+
+struct structure_sprintf {
+    template <class OutT, class BufferT, class InT>
+    static inline void test(BufferT* buffer, const InT& in_val, const char* const conv) {
+        sprintf(buffer, conv, in_val);
+        OutT out_val(buffer);
+    }
+
+    template <class OutT, class BufferT>
+    static inline void test(BufferT* buffer, const std::string& in_val, const char* const conv) {
+        sprintf(buffer, conv, in_val.c_str());
+        OutT out_val(buffer);
+    }
+
+    template <class OutT, class BufferT>
+    static inline void test(BufferT* buffer, std::string_view in_val, const char* const conv) {
+        sprintf(buffer, conv, in_val.data());  // in_val is zero terminated in this program
+        OutT out_val(buffer);
+    }
+};
+
+struct structure_sscanf {
+    template <class OutT, class BufferT, class CharT, std::size_t N>
+    static inline void test(BufferT* /*buffer*/, const boost::array<CharT, N>& in_val, const char* const conv) {
+        OutT out_val;
+        sscanf(in_val.cbegin(), conv, &out_val);
+    }
+
+    template <class OutT, class BufferT, class InT>
+    static inline void test(BufferT* /*buffer*/, const InT& in_val, const char* const conv) {
+        OutT out_val;
+        sscanf(reinterpret_cast<const char*>(in_val), conv, &out_val);
+    }
+
+    template <class OutT, class BufferT>
+    static inline void test(BufferT* /*buffer*/, const std::string& in_val, const char* const conv) {
+        OutT out_val;
+        sscanf(in_val.c_str(), conv, &out_val);
+    }
+
+    template <class OutT, class BufferT>
+    static inline void test(BufferT* /*buffer*/, const boost::iterator_range<const char*>& in_val, const char* const conv) {
+        OutT out_val;
+        sscanf(in_val.begin(), conv, &out_val);
+    }
+
+    template <class OutT, class BufferT>
+    static inline void test(BufferT* /*buffer*/, std::string_view in_val, const char* const conv) {
+        OutT out_val;
+        sscanf(in_val.data(), conv, &out_val);  // in_val is zero terminated in this program
+    }
+};
+
+struct structure_fake {
+    template <class OutT, class BufferT, class InT>
+    static inline void test(BufferT* /*buffer*/, const InT& /*in_val*/, const char* const /*conv*/) {}
+};
+
+static const int fake_test_value = 9999;
+
+template <class T>
+static inline void min_fancy_output(T v1, T v2, T v3, T v4) {
+    const char beg_mark[] = "!!! *";
+    const char end_mark[] = "* !!!";
+    const char no_mark[] = "";
+
+    unsigned int res = 4;
+    if (v1 < v2 && v1 < v3 && v1 < v4) res = 1;
+    if (v2 < v1 && v2 < v3 && v2 < v4) res = 2;
+    if (v3 < v1 && v3 < v2 && v3 < v4) res = 3;
+
+    fout << "[ "
+         << (res == 1 ? beg_mark : no_mark)
+         ;
+
+    if (v1) fout << v1;
+    else fout << "<1";
+
+    fout << (res == 1 ? end_mark : no_mark)
+         << " ][ "
+         << (res == 2 ? beg_mark : no_mark)
+         ;
+
+       if (v2) fout << v2;
+       else fout << "<1";
+
+       fout << (res == 2 ? end_mark : no_mark)
+         << " ][ "
+         << (res == 3 ? beg_mark : no_mark)
+         ;
+
+       if (v3) fout << v3;
+       else fout << "<1";
+
+       fout << (res == 3 ? end_mark : no_mark)
+         << " ][ "
+         << (res == 4 ? beg_mark : no_mark)
+         ;
+
+       if (!v4) fout << "<1";
+       else if (v4 == fake_test_value) fout << "---";
+       else fout << v4;
+
+       fout
+         << (res == 4 ? end_mark : no_mark)
+         << " ]";
+}
+
+template <unsigned int IetartionsCountV, class ToT, class SprintfT, class FromT>
+static inline void perf_test_impl(const FromT& in_val, const char* const conv) {
+
+    typedef boost::chrono::steady_clock test_clock;
+    test_clock::time_point start;
+    typedef boost::chrono::milliseconds duration_t;
+    duration_t lexical_cast_time, ss_constr_time, ss_noconstr_time, printf_time;
+
+    start = test_clock::now();
+    for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+        test_lexical<ToT>(in_val);
+        test_lexical<ToT>(in_val);
+        test_lexical<ToT>(in_val);
+        test_lexical<ToT>(in_val);
+    }
+    lexical_cast_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+
+    start = test_clock::now();
+    for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+        test_ss_constr<ToT>(in_val);
+        test_ss_constr<ToT>(in_val);
+        test_ss_constr<ToT>(in_val);
+        test_ss_constr<ToT>(in_val);
+    }
+    ss_constr_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+    std::stringstream ss;
+    start = test_clock::now();
+    for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+        test_ss_noconstr<ToT>(ss, in_val);
+        test_ss_noconstr<ToT>(ss, in_val);
+        test_ss_noconstr<ToT>(ss, in_val);
+        test_ss_noconstr<ToT>(ss, in_val);
+    }
+    ss_noconstr_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+
+    char buffer[128];
+    start = test_clock::now();
+    for (unsigned int i = 0; i < IetartionsCountV; ++i) {
+        SprintfT::template test<ToT>(buffer, in_val, conv);
+        SprintfT::template test<ToT>(buffer, in_val, conv);
+        SprintfT::template test<ToT>(buffer, in_val, conv);
+        SprintfT::template test<ToT>(buffer, in_val, conv);
+    }
+    printf_time = boost::chrono::duration_cast<duration_t>(test_clock::now() - start);
+
+    min_fancy_output(
+                lexical_cast_time.count(),
+                ss_constr_time.count(),
+                ss_noconstr_time.count(),
+                std::is_same<SprintfT, structure_fake>::value ? fake_test_value : printf_time.count()
+    );
+}
+
+template <class ToT, class SprintfT, class FromT>
+static inline void perf_test(const std::string& test_name, const FromT& in_val, const char* const conv) {
+    const unsigned int ITERATIONSCOUNT = 100000;
+    fout << "  [[ " << test_name << " ]";
+
+    perf_test_impl<ITERATIONSCOUNT/4, ToT, SprintfT>(in_val, conv);
+
+    fout << "]\n";
+}
+
+
+template <class ConverterT>
+void string_like_test_set(const std::string& from) {
+    typedef structure_sscanf ssc_t;
+    ConverterT conv;
+
+    perf_test<char, ssc_t>(from + "->char",               conv("c"), "%c");
+    perf_test<signed char, ssc_t>(from + "->signed char", conv("c"), "%hhd");
+    perf_test<unsigned char, ssc_t>(from + "->unsigned char", conv("c"), "%hhu");
+
+    perf_test<int, ssc_t>(from + "->int",             conv("100"), "%d");
+    perf_test<short, ssc_t>(from + "->short",         conv("100"), "%hd");
+    perf_test<long int, ssc_t>(from + "->long int",   conv("100"), "%ld");
+    perf_test<boost::long_long_type, ssc_t>(from + "->long long", conv("100"), "%lld");
+
+    perf_test<unsigned int, ssc_t>(from + "->unsigned int",             conv("100"), "%u");
+    perf_test<unsigned short, ssc_t>(from + "->unsigned short",         conv("100"), "%hu");
+    perf_test<unsigned long int, ssc_t>(from + "->unsigned long int",   conv("100"), "%lu");
+    perf_test<boost::ulong_long_type, ssc_t>(from + "->unsigned long long", conv("100"), "%llu");
+
+    // perf_test<bool, ssc_t>(from + "->bool", conv("1"), "%");
+
+    perf_test<float, ssc_t>(from + "->float",             conv("1.123"), "%f");
+    perf_test<double, ssc_t>(from + "->double",           conv("1.123"), "%lf");
+    perf_test<long double, ssc_t>(from + "->long double", conv("1.123"), "%Lf");
+    perf_test<boost::array<char, 50>, ssc_t>(from + "->array<char, 50>", conv("1.123"), "%s");
+
+    perf_test<std::string, structure_fake>(from + "->string", conv("string"), "%Lf");
+    perf_test<boost::container::string, structure_fake>(from + "->container::string"
+                                                        , conv("string"), "%Lf");
+
+}
+
+struct to_string_conv {
+    std::string operator()(const char* const c) const {
+        return c;
+    }
+};
+
+struct to_char_conv {
+    const char*  operator()(const char* const c) const {
+        return c;
+    }
+};
+
+struct to_uchar_conv {
+    const unsigned char*  operator()(const char* const c) const {
+        return reinterpret_cast<const unsigned char*>(c);
+    }
+};
+
+
+struct to_schar_conv {
+    const signed char*  operator()(const char* const c) const {
+        return reinterpret_cast<const signed char*>(c);
+    }
+};
+
+struct to_iterator_range {
+    boost::iterator_range<const char*>  operator()(const char* const c) const {
+        return boost::make_iterator_range(c, c + std::strlen(c));
+    }
+};
+
+struct to_array_50 {
+    boost::array<char, 50> operator()(const char* const c) const {
+        boost::array<char, 50> ret;
+        std::strcpy(ret.begin(), c);
+        return ret;
+    }
+};
+
+struct to_string_view {
+    std::string_view operator()(const char* const c) const {
+        return std::string_view{c};
+    }
+};
+
+int main(int argc, char** argv) {
+    BOOST_ASSERT(argc >= 2);
+    std::string output_path(argv[1]);
+    output_path += "/results.txt";
+    fout.open(output_path.c_str(), std::fstream::in | std::fstream::out | std::fstream::app);
+    BOOST_ASSERT(fout);
+
+    fout << "[section " << BOOST_COMPILER << "]\n"
+        << "[table:id Performance Table ( "<< BOOST_COMPILER << ")\n"
+        << "[[From->To] [lexical_cast] [std::stringstream with construction] "
+        << "[std::stringstream without construction][scanf/printf]]\n";
+
+
+    // From std::string to ...
+    string_like_test_set<to_string_conv>("string");
+
+    // From ... to std::string
+    perf_test<std::string, structure_sprintf>("string->char",                'c', "%c");
+    perf_test<std::string, structure_sprintf>("string->signed char",     static_cast<signed char>('c'), "%hhd");
+    perf_test<std::string, structure_sprintf>("string->unsigned char", static_cast<unsigned char>('c'), "%hhu");
+
+    perf_test<std::string, structure_sprintf>("int->string",                 100, "%d");
+    perf_test<std::string, structure_sprintf>("short->string",               static_cast<short>(100), "%hd");
+    perf_test<std::string, structure_sprintf>("long int->string",            100l, "%ld");
+    perf_test<std::string, structure_sprintf>("long long->string",           100ll, "%lld");
+
+    perf_test<std::string, structure_sprintf>("unsigned int->string",        static_cast<unsigned short>(100u), "%u");
+    perf_test<std::string, structure_sprintf>("unsigned short->string",      100u, "%hu");
+    perf_test<std::string, structure_sprintf>("unsigned long int->string",   100ul, "%lu");
+    perf_test<std::string, structure_sprintf>("unsigned long long->string",  static_cast<boost::ulong_long_type>(100), "%llu");
+
+    // perf_test<bool, structure_sscanf>("bool->string", std::string("1"), "%");
+
+    perf_test<std::string, structure_sprintf>("float->string",       1.123f, "%f");
+    perf_test<std::string, structure_sprintf>("double->string",      1.123, "%lf");
+    perf_test<std::string, structure_sprintf>("long double->string", 1.123L, "%Lf");
+
+
+    string_like_test_set<to_char_conv>("char*");
+    string_like_test_set<to_uchar_conv>("unsigned char*");
+    string_like_test_set<to_schar_conv>("signed char*");
+    string_like_test_set<to_iterator_range>("iterator_range<char*>");
+    string_like_test_set<to_string_view>("std::string_view");
+    string_like_test_set<to_array_50>("array<char, 50>");
+
+    perf_test<int, structure_fake>("int->int", 100, "");
+    perf_test<double, structure_fake>("float->double", 100.0f, "");
+    perf_test<signed char, structure_fake>("char->signed char", 'c', "");
+
+
+    fout << "]\n"
+        << "[endsect]\n\n";
+    return 0;
+}
+
+

test.hpp

@@ -1,308 +0,0 @@
-// what:  simple unit test framework
-// who:   developed by Kevlin Henney
-// when:  November 2000
-// where: tested with BCC 5.5, MSVC 6.0, and g++ 2.91
-//
-// ChangeLog:
-//      20 Jan 2001 - Fixed a warning for MSVC (Dave Abrahams)
-
-#ifndef TEST_INCLUDED
-#define TEST_INCLUDED
-
-#include <exception>
-#include <iostream>
-#include <strstream> // for out-of-the-box g++
-#include <string>
-
-namespace test // test tuple comprises name and nullary function (object)
-{
-    template<typename string_type, typename function_type>
-    struct test
-    {
-        string_type   name;
-        function_type action;
-
-        static test make(string_type name, function_type action)
-        {
-            test result; // MSVC aggreggate initializer bugs
-            result.name   = name;
-            result.action = action;
-            return result;
-        }
-    };
-}
-
-namespace test // failure exception used to indicate checked test failures
-{
-    class failure : public std::exception
-    {
-    public: // struction (default cases are OK)
-
-        failure(const std::string & why)
-          : reason(why)
-        {
-        }
-
-        // std::~string has no exception-specification (could throw anything),
-        // but we need to be compatible with std::~exception's empty one
-        // see std::15.4p13 and std::15.4p3
-        ~failure() throw()
-        {
-        }
-
-    public: // usage
-
-        virtual const char * what() const throw()
-        {
-            return reason.c_str();
-        }
-
-    private: // representation
-
-        std::string reason;
-
-    };
-}
-
-namespace test // not_implemented exception used to mark unimplemented tests
-{
-    class not_implemented : public std::exception
-    {
-    public: // usage (default ctor and dtor are OK)
-
-        virtual const char * what() const throw()
-        {
-            return "not implemented";
-        }
-
-    };
-}
-
-namespace test // test utilities
-{
-    inline void check(bool condition, const std::string & description)
-    {
-        if(!condition)
-        {
-            throw failure(description);
-        }
-    }
-
-    inline void check_true(bool value, const std::string & description)
-    {
-        check(value, "expected true: " + description);
-    }
-
-    inline void check_false(bool value, const std::string & description)
-    {
-        check(!value, "expected false: " + description);
-    }
-
-    template<typename lhs_type, typename rhs_type>
-    void check_equal(
-        const lhs_type & lhs, const rhs_type & rhs,
-        const std::string & description)
-    {
-        check(lhs == rhs, "expected equal values: " + description);
-    }
-
-    template<typename lhs_type, typename rhs_type>
-    void check_unequal(
-        const lhs_type & lhs, const rhs_type & rhs,
-        const std::string & description)
-    {
-        check(lhs != rhs, "expected unequal values: " + description);
-    }
-
-    inline void check_null(const void* ptr, const std::string & description)
-    {
-        check(!ptr, "expected null pointer: " + description);
-    }
-
-    inline void check_non_null(const void* ptr, const std::string & description)
-    {
-        check(ptr != 0, "expected non-null pointer: " + description);
-    }
-}
-
-#define TEST_CHECK_THROW(expression, exception, description) \
-    try \
-    { \
-        expression; \
-        throw ::test::failure(description); \
-    } \
-    catch(exception &) \
-    { \
-    }
-
-namespace test // memory tracking (enabled if test new and delete linked in)
-{
-    class allocations
-    {
-    public: // singleton access
-
-        static allocations & instance()
-        {
-            static allocations singleton;
-            return singleton;
-        }
-
-    public: // logging
-
-        void clear()
-        {
-            alloc_count = dealloc_count = 0;
-        }
-
-        void allocation()
-        {
-            ++alloc_count;
-        }
-
-        void deallocation()
-        {
-            ++dealloc_count;
-        }
-
-    public: // reporting
-
-        unsigned long allocated() const
-        {
-            return alloc_count;
-        }
-
-        unsigned long deallocated() const
-        {
-            return dealloc_count;
-        }
-
-        bool balanced() const
-        {
-            return alloc_count == dealloc_count;
-        }
-
-    private: // structors (default dtor is fine)
-    
-        allocations()
-          : alloc_count(0), dealloc_count(0)
-        {
-        }
-
-    private: // prevention
-
-        allocations(const allocations &);
-        allocations & operator=(const allocations &);
-
-    private: // state
-
-        unsigned long alloc_count, dealloc_count;
-
-    };
-}
-
-namespace test // tester is the driver class for a sequence of tests
-{
-    template<typename test_iterator>
-    class tester
-    {
-    public: // structors (default destructor is OK)
-
-        tester(test_iterator first_test, test_iterator after_last_test)
-          : begin(first_test), end(after_last_test)
-        {
-        }
-
-    public: // usage
-
-        bool operator()(); // returns true if all tests passed
-
-    private: // representation
-
-        test_iterator begin, end;
-
-    private: // prevention
-
-        tester(const tester &);
-        tester &operator=(const tester &);
-
-    };
-
-    template<typename test_iterator>
-    bool tester<test_iterator>::operator()()
-    {
-        using namespace std;
-
-        unsigned long passed = 0, failed = 0, unimplemented = 0;
-
-        for(test_iterator current = begin; current != end; ++current)
-        {
-            cerr << "[" << current->name << "] " << flush;
-            string result = "passed"; // optimistic
-
-            try
-            {
-                allocations::instance().clear();
-                current->action();
-
-                if(!allocations::instance().balanced())
-                {
-                    unsigned long allocated   = allocations::instance().allocated();
-                    unsigned long deallocated = allocations::instance().deallocated();
-                    ostrstream report;
-                    report << "new/delete ("
-                           << allocated << " allocated, "
-                           << deallocated << " deallocated)"
-                           << ends;
-                    const char * text = report.str();
-                    report.freeze(false);
-                    throw failure(text);
-                }
-
-                ++passed;
-            }
-            catch(const failure & caught)
-            {
-                (result = "failed: ") += caught.what();
-                ++failed;
-            }
-            catch(const not_implemented &)
-            {
-                result = "not implemented";
-                ++unimplemented;
-            }
-            catch(const exception & caught)
-            {
-                (result = "exception: ") += caught.what();
-                ++failed;
-            }
-            catch(...)
-            {
-                result = "failed with unknown exception";
-                ++failed;
-            }
-
-            cerr << result << endl;
-        }
-
-        cerr << passed + failed << " tests: "
-             << passed << " passed, "
-             << failed << " failed";
-
-        if(unimplemented)
-        {
-            cerr << " (" << unimplemented << " not implemented)";
-        }
-
-        cerr << endl;
-
-        return failed == 0;
-    }
-}
-
-#endif
-
-// Copyright Kevlin Henney, 2000. All rights reserved.
-//
-// Distributed under the Boost Software License, Version 1.0. (See
-// accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)

test/CMakeLists.txt

@@ -0,0 +1,84 @@
+# Copyright Antony Polukhin, 2021-2026.
+#
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
+
+if(NOT TARGET tests)
+  add_custom_target(tests)
+endif()
+
+function(boost_lexical_cast_add_test_impl test_name test_file libs)
+    add_executable(${test_name} ${test_file})
+    target_link_libraries(${test_name} PRIVATE ${libs})
+    add_test(NAME ${test_name} COMMAND ${test_name})
+    add_dependencies(tests ${test_name})
+endfunction()
+
+function(boost_lexical_cast_add_test name libs)
+    set(test_name lexical_cast_${name})
+    set(test_file ${name}.cpp)
+    boost_lexical_cast_add_test_impl(${test_name} ${test_file} "Boost::lexical_cast;${libs}")
+endfunction()
+
+boost_lexical_cast_add_test(lexical_cast_test Boost::type_traits)
+boost_lexical_cast_add_test(loopback_test "")
+boost_lexical_cast_add_test(abstract_test "")
+boost_lexical_cast_add_test(noncopyable_test "")
+boost_lexical_cast_add_test(vc8_bug_test "")
+boost_lexical_cast_add_test(implicit_convert "")
+boost_lexical_cast_add_test(wchars_test "")
+boost_lexical_cast_add_test(float_types_test "")
+
+if(NOT MSVC)
+    # Make sure that LexicalCast works the same way as some of the C++ Standard Libraries
+    boost_lexical_cast_add_test_impl(lexical_cast_float_types_non_opt float_types_test.cpp Boost::lexical_cast)
+    target_compile_definitions(lexical_cast_float_types_non_opt PRIVATE BOOST_LEXICAL_CAST_DETAIL_TEST_ON_OLD)
+endif()
+
+boost_lexical_cast_add_test(inf_nan_test "")
+boost_lexical_cast_add_test(containers_test "")
+boost_lexical_cast_add_test(empty_input_test Boost::range)
+boost_lexical_cast_add_test(pointers_test "")
+
+if(MSVC)
+    add_executable(lexical_cast_typedefed_wchar_test_compile typedefed_wchar_test.cpp)
+    target_compile_options(lexical_cast_typedefed_wchar_test_compile PRIVATE "/Zc:wchar_t-")
+
+    boost_lexical_cast_add_test(typedefed_wchar_test_runtime "")
+    target_compile_options(lexical_cast_typedefed_wchar_test_runtime PRIVATE "/Zc:wchar_t-")
+endif()
+
+boost_lexical_cast_add_test(no_locale_test Boost::range)
+target_compile_definitions(lexical_cast_no_locale_test
+    PRIVATE
+      BOOST_NO_STD_LOCALE
+      BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
+)
+
+boost_lexical_cast_add_test_impl(lexical_cast_no_exceptions_test no_exceptions_test.cpp "Boost::container;Boost::range")
+target_include_directories(lexical_cast_no_exceptions_test PRIVATE ../include)
+target_compile_definitions(lexical_cast_no_exceptions_test
+    PRIVATE
+      _HAS_EXCEPTIONS=0 # MSVC stdlib
+      _STLP_NO_EXCEPTIONS # STLPort
+)
+if(MSVC)
+    target_compile_definitions(lexical_cast_no_exceptions_test PRIVATE BOOST_NO_EXCEPTIONS)
+endif()
+target_compile_options(lexical_cast_no_exceptions_test PRIVATE "-fno-exceptions")
+
+boost_lexical_cast_add_test(iterator_range_test Boost::range)
+boost_lexical_cast_add_test(string_view_test Boost::utility)
+boost_lexical_cast_add_test(arrays_test Boost::array)
+boost_lexical_cast_add_test(integral_types_test Boost::type_traits)
+boost_lexical_cast_add_test(stream_detection_test "")
+boost_lexical_cast_add_test(stream_traits_test "Boost::array;Boost::range;Boost::utility")
+
+boost_lexical_cast_add_test(filesystem_test Boost::filesystem)
+boost_lexical_cast_add_test(try_lexical_convert "")
+
+file(GLOB EXAMPLE_FILES "../example/*.cpp")
+foreach (testsourcefile ${EXAMPLE_FILES})
+    get_filename_component(testname ${testsourcefile} NAME_WE)
+    boost_lexical_cast_add_test_impl(lexical_cast_example_${testname} ${testsourcefile} "Boost::variant;Boost::date_time")
+endforeach()

test/Jamfile.v2

@@ -1,29 +1,93 @@
-# Signals library
-
 # Copyright (C) 2001-2003 Douglas Gregor
+# Copyright Antony Polukhin, 2011-2026.
+#
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#
 
-# Permission to copy, use, sell and distribute this software is granted 
-# provided this copyright notice appears in all copies. Permission to modify 
-# the code and to distribute modified code is granted provided this copyright 
-# notice appears in all copies, and a notice that the code was modified is 
-# included with the copyright notice. This software is provided "as is" 
-# without express or implied warranty, and with no claim as to its suitability 
-# for any purpose. 
-
-# For more information, see http://www.boost.org/
-
-# bring in rules for testing
+require-b2 5.0.1 ;
+import-search /boost/config/checks ;
+import config : requires ;
 import testing ;
+import feature ;
+
+project
+    : requirements
+        <library>/boost/lexical_cast//boost_lexical_cast
+        [ requires cxx11_rvalue_references cxx11_static_assert cxx11_template_aliases ]
+        <link>static
+        <toolset>gcc-4.7:<cxxflags>-ftrapv
+        <toolset>gcc-4.6:<cxxflags>-ftrapv
+        <toolset>clang:<cxxflags>-ftrapv
+        # default to all warnings on:
+        <warnings>all
+        # set warnings as errors for those compilers we know we get warning free:
+        <toolset>gcc:<cxxflags>-Wextra
+
+        # Not a lexical_cast related warning: boost/preprocessor/variadic/elem.hpp:29:46: warning: variadic macros are a C99 feature
+        <toolset>clang:<cxxflags>-Wno-variadic-macros
+        <toolset>gcc:<cxxflags>-Wno-variadic-macros
+
+        # Not a lexical_cast related warning: boost/mpl/aux_/preprocessed/gcc/greater_equal.hpp:78:1: warning: empty macro arguments are a C99 feature [-Wc99-extensions]
+        #                                     boost/mpl/iter_fold.hpp:45:1: warning: empty macro arguments are a C99 feature [-Wc99-extensions]
+        <toolset>clang:<cxxflags>-Wno-c99-extensions
+
+        <library>/boost/array//boost_array
+        <library>/boost/range//boost_range
+        <library>/boost/utility//boost_utility
+    ;
+
+# Thanks to Steven Watanabe for helping with <nowchar> feature
+feature.feature nowchar : on :
+ composite optional propagated link-incompatible ;
+feature.compose <nowchar>on : <cxxflags>"/Zc:wchar_t-" ;
 
 test-suite conversion
-  : [ run implicit_cast.cpp ]
-    [ compile-fail implicit_cast_fail.cpp ]
-    [ run ../cast_test.cpp ]
-    [ run ../numeric_cast_test.cpp ]    
-    [ run ../lexical_cast_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
-    [ run lexical_cast_loopback_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
-    [ run lexical_cast_abstract_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
-    [ run lexical_cast_noncopyable_test.cpp ../../test/build//boost_unit_test_framework/<link>static ]
+  : [ run lexical_cast_test.cpp ]
+    [ run loopback_test.cpp ]
+    [ run abstract_test.cpp ]
+    [ run noncopyable_test.cpp ]
+    [ run vc8_bug_test.cpp ]
+    [ run implicit_convert.cpp ]
+    [ run wchars_test.cpp ]
+    [ run float_types_test.cpp ]
+
+    # Make sure that LexicalCast works the same way as some of the C++ Standard Libraries
+    [ run float_types_test.cpp : : : <define>BOOST_LEXICAL_CAST_DETAIL_TEST_ON_OLD
+        <toolset>msvc:<build>no         # could have outdated behavior in some border cases
+        <target-os>darwin:<build>no     # may have outdated behavior in some border cases
+        : float_types_non_opt
+    ]
+
+    [ run inf_nan_test.cpp ]
+    [ run containers_test.cpp : : : <toolset>gcc:<cxxflags>-Wno-long-long <toolset>clang:<cxxflags>-Wno-long-long ]
+    [ run empty_input_test.cpp ]
+    [ run pointers_test.cpp ]
+    [ compile typedefed_wchar_test.cpp : <toolset>msvc:<nowchar>on <library>/boost/date_time//boost_date_time ]
+    [ run typedefed_wchar_test_runtime.cpp : : : <toolset>msvc:<nowchar>on <toolset>msvc,<stdlib>stlport:<build>no ]
+    [ run no_locale_test.cpp : : : <define>BOOST_NO_STD_LOCALE <define>BOOST_LEXICAL_CAST_ASSUME_C_LOCALE ]
+    [ run no_exceptions_test.cpp : : : <exception-handling>off
+        <define>_HAS_EXCEPTIONS=0 # MSVC stdlib
+        <define>_STLP_NO_EXCEPTIONS # STLPort
+    ]
+    [ run iterator_range_test.cpp ]
+    [ run string_view_test.cpp ]
+    [ run arrays_test.cpp : : :
+        <toolset>msvc:<cxxflags>/wd4512 # assignment operator could not be generated
+    ]
+    [ run integral_types_test.cpp ]
+    [ run stream_detection_test.cpp ]
+    [ run stream_traits_test.cpp ]
+    [ compile-fail to_pointer_test.cpp ]
+    [ compile-fail from_volatile.cpp ]
+    [ run filesystem_test.cpp /boost/filesystem//boost_filesystem : : : <toolset>gcc,<target-os>windows:<build>no ] # Boost.Atomic no longer supports MinGW
+    [ run try_lexical_convert.cpp ]
   ;
 
-      
+# Assuring that examples compile and run. Adding sources from `example` directory to the `conversion` test suite.
+for local p in [ glob ../example/*.cpp ]
+{
+    conversion += [ run $(p) : : : <library>/boost/variant//boost_variant <library>/boost/date_time//boost_date_time ] ;
+}
+
+

test/abstract_test.cpp

@@ -3,6 +3,7 @@
 //  See http://www.boost.org for most recent version, including documentation.
 //
 //  Copyright Sergey Shandar 2005, Alexander Nasonov, 2007.
+//  Copyright Antony Polukhin, 2023-2026.
 //
 //  Distributed under the Boost
 //  Software License, Version 1.0. (See accompanying file
@@ -11,34 +12,15 @@
 // Test abstract class. Bug 1358600:
 // http://sf.net/tracker/?func=detail&aid=1358600&group_id=7586&atid=107586
 
-#include <boost/config.hpp>
-
-#if defined(__INTEL_COMPILER)
-#pragma warning(disable: 193 383 488 981 1418 1419)
-#elif defined(BOOST_MSVC)
-#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
-#endif
+#include <boost/core/lightweight_test.hpp>
 
 #include <boost/lexical_cast.hpp>
-#include <boost/test/unit_test.hpp>
-
-using namespace boost;
-
-void test_abstract();
-
-unit_test::test_suite *init_unit_test_suite(int, char *[])
-{
-    unit_test_framework::test_suite *suite =
-        BOOST_TEST_SUITE("lexical_cast unit test");
-    suite->add(BOOST_TEST_CASE(&test_abstract));
-
-    return suite;
-}
 
 class A
 {
 public:
     virtual void out(std::ostream &) const = 0;
+    virtual ~A() {}
 };
 
 class B: public A
@@ -51,11 +33,17 @@ std::ostream &operator<<(std::ostream &O, const A &a)
 {
     a.out(O);
     return O;
-};
+}
 
 void test_abstract()
 {
     const A &a = B();
-    BOOST_CHECK(boost::lexical_cast<std::string>(a) == "B");
+    BOOST_TEST(boost::lexical_cast<std::string>(a) == "B");
+}
+
+int main()
+{
+    test_abstract();
+    return boost::report_errors();
 }
 

test/appveyor.yml

@@ -0,0 +1,100 @@
+# Use, modification, and distribution are
+# subject to the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#
+# Copyright Antony Polukhin, 2016-2026.
+
+#
+# See https://svn.boost.org/trac/boost/wiki/TravisCoverals for description of this file
+# and how it can be used with Boost libraries.
+#
+# File revision #6
+
+init:
+    # boost-local/libs/ folder to put this library into. This may be useful, if you're for example running Travis
+    # from `Boost.DLL` repo while Boost already has `dll` and with to replace `dll` with content of`Boost.DLL`.
+    #
+    # Otherwise just leave the default value - set BOOST_LIBS_FOLDER=%APPVEYOR_PROJECT_NAME%
+    - set BOOST_LIBS_FOLDER=%APPVEYOR_PROJECT_NAME%
+
+###############################################################################################################
+# From this point and below code is same for all the Boost libs
+###############################################################################################################
+
+version: 1.74.{build}-{branch}
+
+# branches to build
+branches:
+  except:
+    - gh-pages
+
+skip_tags: true
+
+environment:
+  matrix:
+#    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+#      TOOLSET: msvc # TODO: clang-win ???
+#      ADDRMD: 32,64
+#      CXXSTD: 17,latest
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc # clang-win has problems with structured bindings - it can not correclty use std::tuple_size
+      ADDRMD: 32,64
+      CXXSTD: 17,latest
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc # clang-win has problems with structured bindings - it can not correclty use std::tuple_size
+      ADDRMD: 32,64
+      CXXSTD: 17,latest
+      CXXFLAGS: /permissive-
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      TOOLSET: msvc # clang-win has problems with structured bindings - it can not correclty use std::tuple_size
+      ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\cygwin\bin;
+      TOOLSET: gcc
+      CXXSTD: 14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\cygwin64\bin;
+      TOOLSET: gcc
+      CXXSTD: 14,1z
+#    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+#      ADDPATH: C:\mingw\bin;
+#      TOOLSET: gcc
+#      CXXSTD: 14,1z
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      ADDPATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;
+      TOOLSET: gcc
+      CXXSTD: 14,1z
+
+before_build:
+    - set BOOST_BRANCH=develop
+    - if "%APPVEYOR_REPO_BRANCH%" == "master" set BOOST_BRANCH=master
+    - echo "Testing %BOOST_LIBS_FOLDER%"
+    # Cloning Boost libraries (fast nondeep cloning)
+    - set BOOST=C:/boost-local
+    - git clone -b %BOOST_BRANCH% --depth 10 https://github.com/boostorg/boost.git %BOOST%
+    - cd %BOOST%
+    - git submodule update --init --depth 10 tools/build tools/boostdep
+
+    - echo "rm -rf %BOOST%/libs/%BOOST_LIBS_FOLDER%"
+    - rm -rf %BOOST%/libs/%BOOST_LIBS_FOLDER%
+    - mv %APPVEYOR_BUILD_FOLDER% %BOOST%/libs/%BOOST_LIBS_FOLDER%
+    - python tools/boostdep/depinst/depinst.py --git_args "--depth 10 --jobs 2" -I example -I examples %BOOST_LIBS_FOLDER%
+
+build_script:
+    - cmd /c bootstrap
+    - b2.exe headers
+    - cd %BOOST%/libs/%BOOST_LIBS_FOLDER%/test
+
+after_build:
+before_test:
+test_script:
+  - PATH=%ADDPATH%%PATH%
+  - if not "%CXXSTD%" == "" set CXXSTD=cxxstd=%CXXSTD%
+  - if not "%ADDRMD%" == "" set ADDRMD=address-model=%ADDRMD%
+  - echo "Running command ..\..\..\b2 -j3 toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release"
+  - ..\..\..\b2.exe -j3 toolset=%TOOLSET% %CXXSTD% %ADDRMD% variant=debug,release cxxflags="-DBOOST_TRAVISCI_BUILD %CXXFLAGS%"
+
+after_test:
+on_success:
+on_failure:
+on_finish:

test/arrays_test.cpp

@@ -0,0 +1,373 @@
+//  Testing boost::lexical_cast with boost::container::string.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/array.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+using namespace boost;
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(_LIBCPP_VERSION) && !defined(BOOST_MSVC)
+#define BOOST_LC_RUNU16
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(_LIBCPP_VERSION) && !defined(BOOST_MSVC)
+#define BOOST_LC_RUNU32
+#endif
+
+template <template <class, std::size_t> class ArrayT, class T>
+static void testing_template_array_output_on_spec_value(T val)
+{
+    typedef ArrayT<char, 300>             arr_type;
+    typedef ArrayT<char, 1>               short_arr_type;
+    typedef ArrayT<unsigned char, 300>    uarr_type;
+    typedef ArrayT<unsigned char, 1>      ushort_arr_type;
+    typedef ArrayT<signed char, 4>        sarr_type;
+    typedef ArrayT<signed char, 3>        sshort_arr_type;
+
+    std::string ethalon("100");
+    using namespace std;
+
+    {
+        arr_type res1 = lexical_cast<arr_type>(val);
+        BOOST_TEST_EQ(&res1[0], ethalon);
+        const arr_type res2 = lexical_cast<arr_type>(val);
+        BOOST_TEST_EQ(&res2[0], ethalon);
+        BOOST_TEST_THROWS(lexical_cast<short_arr_type>(val), boost::bad_lexical_cast);
+    }
+
+    {
+        uarr_type res1 = lexical_cast<uarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<char*>(&res1[0]), ethalon);
+        const uarr_type res2 = lexical_cast<uarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<const char*>(&res2[0]), ethalon);
+        BOOST_TEST_THROWS(lexical_cast<ushort_arr_type>(val), boost::bad_lexical_cast);
+    }
+
+    {
+        sarr_type res1 = lexical_cast<sarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<char*>(&res1[0]), ethalon);
+        const sarr_type res2 = lexical_cast<sarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<const char*>(&res2[0]), ethalon);
+        BOOST_TEST_THROWS(lexical_cast<sshort_arr_type>(val), boost::bad_lexical_cast);
+    }
+
+#if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING) && !defined(_LIBCPP_VERSION)
+    typedef ArrayT<wchar_t, 300> warr_type;
+    typedef ArrayT<wchar_t, 3> wshort_arr_type;
+    std::wstring wethalon(L"100");
+
+    {
+        warr_type res = lexical_cast<warr_type>(val);
+        BOOST_TEST(&res[0] == wethalon);
+    }
+
+    {
+        const warr_type res = lexical_cast<warr_type>(val);
+        BOOST_TEST(&res[0] == wethalon);
+    }
+
+    BOOST_TEST_THROWS(lexical_cast<wshort_arr_type>(val), boost::bad_lexical_cast);
+
+#endif
+
+#ifdef BOOST_LC_RUNU16
+    typedef ArrayT<char16_t, 300> u16arr_type;
+    typedef ArrayT<char16_t, 3> u16short_arr_type;
+    std::u16string u16ethalon(u"100");
+
+    {
+        u16arr_type res = lexical_cast<u16arr_type>(val);
+        BOOST_TEST(&res[0] == u16ethalon);
+    }
+
+    {
+        const u16arr_type res = lexical_cast<u16arr_type>(val);
+        BOOST_TEST(&res[0] == u16ethalon);
+    }
+
+    BOOST_TEST_THROWS(lexical_cast<u16short_arr_type>(val), boost::bad_lexical_cast);
+#endif
+
+#ifdef BOOST_LC_RUNU32
+    typedef ArrayT<char32_t, 300> u32arr_type;
+    typedef ArrayT<char32_t, 3> u32short_arr_type;
+    std::u32string u32ethalon(U"100");
+
+    {
+        u32arr_type res = lexical_cast<u32arr_type>(val);
+        BOOST_TEST(&res[0] == u32ethalon);
+    }
+
+    {
+        const u32arr_type res = lexical_cast<u32arr_type>(val);
+        BOOST_TEST(&res[0] == u32ethalon);
+    }
+
+    BOOST_TEST_THROWS(lexical_cast<u32short_arr_type>(val), boost::bad_lexical_cast);
+#endif
+}
+
+
+template <template <class, std::size_t> class ArrayT>
+static void testing_template_array_output_on_char_value()
+{
+    typedef ArrayT<char, 300>             arr_type;
+    typedef ArrayT<char, 1>               short_arr_type;
+    typedef ArrayT<unsigned char, 300>    uarr_type;
+    typedef ArrayT<unsigned char, 1>      ushort_arr_type;
+    typedef ArrayT<signed char, 4>        sarr_type;
+    typedef ArrayT<signed char, 3>        sshort_arr_type;
+
+    const char val[] = "100";
+    std::string ethalon("100");
+    using namespace std;
+
+    {
+        arr_type res1 = lexical_cast<arr_type>(val);
+        BOOST_TEST_EQ(&res1[0], ethalon);
+        const arr_type res2 = lexical_cast<arr_type>(val);
+        BOOST_TEST_EQ(&res2[0], ethalon);
+        BOOST_TEST_THROWS(lexical_cast<short_arr_type>(val), boost::bad_lexical_cast);
+    }
+
+    {
+        uarr_type res1 = lexical_cast<uarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<char*>(&res1[0]), ethalon);
+        const uarr_type res2 = lexical_cast<uarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<const char*>(&res2[0]), ethalon);
+        BOOST_TEST_THROWS(lexical_cast<ushort_arr_type>(val), boost::bad_lexical_cast);
+    }
+
+    {
+        sarr_type res1 = lexical_cast<sarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<char*>(&res1[0]), ethalon);
+        const sarr_type res2 = lexical_cast<sarr_type>(val);
+        BOOST_TEST_EQ(reinterpret_cast<const char*>(&res2[0]), ethalon);
+        BOOST_TEST_THROWS(lexical_cast<sshort_arr_type>(val), boost::bad_lexical_cast);
+    }
+
+#if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING) && !defined(_LIBCPP_VERSION)
+    typedef ArrayT<wchar_t, 4> warr_type;
+    typedef ArrayT<wchar_t, 3> wshort_arr_type;
+    std::wstring wethalon(L"100");
+
+    {
+        warr_type res = lexical_cast<warr_type>(val);
+        BOOST_TEST(&res[0] == wethalon);
+        warr_type res3 = lexical_cast<warr_type>(wethalon);
+        BOOST_TEST(&res3[0] == wethalon);
+    }
+
+    {
+        const warr_type res = lexical_cast<warr_type>(val);
+        BOOST_TEST(&res[0] == wethalon);
+        const warr_type res3 = lexical_cast<warr_type>(wethalon);
+        BOOST_TEST(&res3[0] == wethalon);
+    }
+
+    BOOST_TEST_THROWS(lexical_cast<wshort_arr_type>(val), boost::bad_lexical_cast);
+
+#endif
+
+#ifdef BOOST_LC_RUNU16
+    typedef ArrayT<char16_t, 300> u16arr_type;
+    typedef ArrayT<char16_t, 3> u16short_arr_type;
+    std::u16string u16ethalon(u"100");
+
+    {
+#ifdef BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES
+        u16arr_type res = lexical_cast<u16arr_type>(val);
+        BOOST_TEST(&res[0] == u16ethalon);
+#endif
+
+        u16arr_type res3 = lexical_cast<u16arr_type>(u16ethalon);
+        BOOST_TEST(&res3[0] == u16ethalon);
+    }
+
+    {
+#ifdef BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES
+        const u16arr_type res = lexical_cast<u16arr_type>(val);
+        BOOST_TEST(&res[0] == u16ethalon);
+#endif
+        const u16arr_type res3 = lexical_cast<u16arr_type>(u16ethalon);
+        BOOST_TEST(&res3[0] == u16ethalon);
+    }
+
+    // Some compillers may throw std::bad_alloc here
+    BOOST_TEST_THROWS(lexical_cast<u16short_arr_type>(val), std::exception);
+#endif
+
+#ifdef BOOST_LC_RUNU32
+    typedef ArrayT<char32_t, 300> u32arr_type;
+    typedef ArrayT<char32_t, 3> u32short_arr_type;
+    std::u32string u32ethalon(U"100");
+
+    {
+#ifdef BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES
+        u32arr_type res = lexical_cast<u32arr_type>(val);
+        BOOST_TEST(&res[0] == u32ethalon);
+#endif
+        u32arr_type res3 = lexical_cast<u32arr_type>(u32ethalon);
+        BOOST_TEST(&res3[0] == u32ethalon);
+    }
+
+    {
+#ifdef BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES
+        const u32arr_type res = lexical_cast<u32arr_type>(val);
+        BOOST_TEST(&res[0] == u32ethalon);
+#endif
+        const u32arr_type res3 = lexical_cast<u32arr_type>(u32ethalon);
+        BOOST_TEST(&res3[0] == u32ethalon);
+    }
+
+    // Some compillers may throw std::bad_alloc here
+    BOOST_TEST_THROWS(lexical_cast<u32short_arr_type>(val), std::exception);
+#endif
+}
+
+
+void testing_boost_array_output_conversion()
+{
+#ifndef _LIBCPP_VERSION
+    testing_template_array_output_on_char_value<boost::array>();
+    testing_template_array_output_on_spec_value<boost::array>(100);
+    testing_template_array_output_on_spec_value<boost::array>(static_cast<short>(100));
+    testing_template_array_output_on_spec_value<boost::array>(static_cast<unsigned short>(100));
+    testing_template_array_output_on_spec_value<boost::array>(static_cast<unsigned int>(100));
+#endif
+}
+
+void testing_std_array_output_conversion()
+{
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+    testing_template_array_output_on_char_value<std::array>();
+    testing_template_array_output_on_spec_value<std::array>(100);
+    testing_template_array_output_on_spec_value<std::array>(static_cast<short>(100));
+    testing_template_array_output_on_spec_value<std::array>(static_cast<unsigned short>(100));
+    testing_template_array_output_on_spec_value<std::array>(static_cast<unsigned int>(100));
+#endif
+
+    BOOST_TEST(true);
+}
+
+template <template <class, std::size_t> class ArrayT>
+static void testing_generic_array_input_conversion()
+{
+    {
+        ArrayT<char, 4> var_zero_terminated = {{ '1', '0', '0', '\0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_zero_terminated), "100");
+        BOOST_TEST_EQ(lexical_cast<int>(var_zero_terminated), 100);
+
+        ArrayT<char, 3> var_none_terminated = {{ '1', '0', '0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_none_terminated), "100");
+        BOOST_TEST_EQ(lexical_cast<short>(var_none_terminated), static_cast<short>(100));
+
+        ArrayT<const char, 4> var_zero_terminated_const_char = {{ '1', '0', '0', '\0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_zero_terminated_const_char), "100");
+
+        ArrayT<const char, 3> var_none_terminated_const_char = {{ '1', '0', '0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_none_terminated_const_char), "100");
+
+        const ArrayT<char, 4> var_zero_terminated_const_var = {{ '1', '0', '0', '\0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_zero_terminated_const_var), "100");
+
+        const ArrayT<char, 3> var_none_terminated_const_var = {{ '1', '0', '0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_none_terminated_const_var), "100");
+
+        const ArrayT<const char, 4> var_zero_terminated_const_var_const_char = {{ '1', '0', '0', '\0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_zero_terminated_const_var_const_char), "100");
+
+        const ArrayT<const char, 3> var_none_terminated_const_var_const_char = {{ '1', '0', '0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_none_terminated_const_var_const_char), "100");
+        BOOST_TEST_EQ(lexical_cast<int>(var_none_terminated_const_var_const_char), 100);
+    }
+
+    {
+        const ArrayT<const unsigned char, 4> var_zero_terminated_const_var_const_char = {{ '1', '0', '0', '\0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_zero_terminated_const_var_const_char), "100");
+
+        const ArrayT<const unsigned char, 3> var_none_terminated_const_var_const_char = {{ '1', '0', '0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_none_terminated_const_var_const_char), "100");
+    }
+
+    {
+        const ArrayT<const signed char, 4> var_zero_terminated_const_var_const_char = {{ '1', '0', '0', '\0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_zero_terminated_const_var_const_char), "100");
+
+        const ArrayT<const signed char, 3> var_none_terminated_const_var_const_char = {{ '1', '0', '0'}};
+        BOOST_TEST_EQ(lexical_cast<std::string>(var_none_terminated_const_var_const_char), "100");
+        BOOST_TEST_EQ(lexical_cast<unsigned int>(var_none_terminated_const_var_const_char), 100u);
+    }
+
+
+#if !defined(BOOST_NO_STRINGSTREAM) && !defined(BOOST_NO_STD_WSTRING)
+    {
+        const ArrayT<const wchar_t, 4> var_zero_terminated_const_var_const_char = {{ L'1', L'0', L'0', L'\0'}};
+        BOOST_TEST(lexical_cast<std::wstring>(var_zero_terminated_const_var_const_char) == L"100");
+
+        const ArrayT<const wchar_t, 3> var_none_terminated_const_var_const_char = {{ L'1', L'0', L'0'}};
+        BOOST_TEST(lexical_cast<std::wstring>(var_none_terminated_const_var_const_char) == L"100");
+        BOOST_TEST_EQ(lexical_cast<int>(var_none_terminated_const_var_const_char), 100);
+    }
+#endif
+
+#ifdef BOOST_LC_RUNU16
+    {
+        const ArrayT<const char16_t, 4> var_zero_terminated_const_var_const_char = {{ u'1', u'0', u'0', u'\0'}};
+        BOOST_TEST(lexical_cast<std::u16string>(var_zero_terminated_const_var_const_char) == u"100");
+        BOOST_TEST_EQ(lexical_cast<unsigned short>(var_zero_terminated_const_var_const_char), static_cast<unsigned short>(100));
+
+        const ArrayT<const char16_t, 3> var_none_terminated_const_var_const_char = {{ u'1', u'0', u'0'}};
+        BOOST_TEST(lexical_cast<std::u16string>(var_none_terminated_const_var_const_char) == u"100");
+    }
+#endif
+
+#ifdef BOOST_LC_RUNU32
+    {
+        const ArrayT<const char32_t, 4> var_zero_terminated_const_var_const_char = {{ U'1', U'0', U'0', U'\0'}};
+        BOOST_TEST(lexical_cast<std::u32string>(var_zero_terminated_const_var_const_char) == U"100");
+
+        const ArrayT<const char32_t, 3> var_none_terminated_const_var_const_char = {{ U'1', U'0', U'0'}};
+        BOOST_TEST(lexical_cast<std::u32string>(var_none_terminated_const_var_const_char) == U"100");
+        BOOST_TEST_EQ(lexical_cast<int>(var_none_terminated_const_var_const_char), 100);
+    }
+#endif
+}
+
+void testing_boost_array_input_conversion()
+{
+#ifndef _LIBCPP_VERSION
+    testing_generic_array_input_conversion<boost::array>();
+#endif
+    BOOST_TEST(true);
+}
+
+void testing_std_array_input_conversion()
+{
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+    testing_generic_array_input_conversion<std::array>();
+#endif
+
+    BOOST_TEST(true);
+}
+
+int main()
+{
+    testing_boost_array_output_conversion();
+    testing_std_array_output_conversion();
+    testing_boost_array_input_conversion();
+    testing_std_array_input_conversion();
+
+    return boost::report_errors();
+}
+

test/cmake_subdir_test/CMakeLists.txt

@@ -0,0 +1,80 @@
+# Copyright  (c) 2016-2025 Antony Polukhin
+# Copyright  (c) 2025-2026 Fedor Osetrov
+# Distributed under the Boost Software License, Version 1.0.
+# See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt
+
+cmake_minimum_required(VERSION 3.5...4.0)
+
+project(lexical_cast_subdir_test LANGUAGES CXX)
+
+set(deps
+
+# Library dependencies
+config
+container
+core
+throw_exception
+
+# Test dependencies
+algorithm
+array
+align
+assert
+atomic
+bind
+compat
+concept_check
+container_hash
+conversion
+date_time
+describe
+detail
+exception
+filesystem
+function
+function_types
+functional
+fusion
+integer
+intrusive
+io
+iterator
+move
+mp11
+mpl
+numeric/conversion
+optional
+predef
+preprocessor
+range
+regex
+scope
+smart_ptr
+static_assert
+system
+test
+tokenizer
+tuple
+type_index
+type_traits
+typeof
+unordered
+utility
+variant
+variant2
+winapi
+)
+
+foreach(dep IN LISTS deps)
+    add_subdirectory(../../../${dep} boostorg/${dep})
+endforeach()
+
+enable_testing()
+add_subdirectory(../../ boostorg/lexical_cast)
+
+if (BOOST_USE_MODULES)
+    add_executable(boost_lexical_cast_module_usage ../modules/usage_sample.cpp)
+    target_link_libraries(boost_lexical_cast_module_usage PRIVATE Boost::lexical_cast)
+    add_test(NAME boost_lexical_cast_module_usage COMMAND boost_lexical_cast_module_usage)
+endif()
+

test/containers_test.cpp

@@ -0,0 +1,77 @@
+//  Testing boost::lexical_cast with boost::container::string.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/container/string.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+using namespace boost;
+
+void testing_boost_containers_basic_string()
+{
+    BOOST_TEST("100" == lexical_cast<boost::container::string>("100"));
+    BOOST_TEST(L"100" == lexical_cast<boost::container::wstring>(L"100"));
+
+    BOOST_TEST("100" == lexical_cast<boost::container::string>(100));
+    boost::container::string str("1000");
+    BOOST_TEST(1000 == lexical_cast<int>(str));
+}
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+void testing_boost_containers_string_std_string()
+{
+    std::string std_str("std_str");
+    boost::container::string boost_str("boost_str");
+    BOOST_TEST(boost::lexical_cast<std::string>(boost_str) == "boost_str");
+    BOOST_TEST(boost::lexical_cast<boost::container::string>(std_str) == "std_str");
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    std::wstring std_wstr(L"std_wstr");
+    boost::container::wstring boost_wstr(L"boost_wstr");
+
+    BOOST_TEST(boost::lexical_cast<std::wstring>(boost_wstr) == L"boost_wstr");
+    BOOST_TEST(boost::lexical_cast<boost::container::wstring>(std_wstr) == L"std_wstr");
+
+#endif
+
+}
+
+void testing_boost_containers_string_widening()
+{
+    const char char_array[] = "Test string";
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    const wchar_t wchar_array[] = L"Test string";
+    BOOST_TEST(boost::lexical_cast<boost::container::wstring>(char_array) == wchar_array);
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && defined(BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES)
+    const char16_t char16_array[] = u"Test string";
+    BOOST_TEST(boost::lexical_cast<boost::container::basic_string<char16_t> >(char_array) == char16_array);
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && defined(BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES)
+    const char32_t char32_array[] = U"Test string";
+    BOOST_TEST(boost::lexical_cast<boost::container::basic_string<char32_t> >(char_array) == char32_array);
+#endif
+}
+
+int main()
+{
+    testing_boost_containers_basic_string();
+    testing_boost_containers_string_std_string();
+    testing_boost_containers_string_widening();
+
+    return boost::report_errors();
+}

test/empty_input_test.cpp

@@ -0,0 +1,150 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/range/iterator_range.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <vector>
+
+#include <boost/lexical_cast.hpp>
+
+#include "escape_struct.hpp"
+
+using namespace boost;
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+template <class T>
+void do_test_on_empty_input(T& v)
+{
+    BOOST_TEST_THROWS(lexical_cast<int>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<float>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<double>(v), bad_lexical_cast);
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+    BOOST_TEST_THROWS(lexical_cast<long double>(v), bad_lexical_cast);
+#endif
+    BOOST_TEST_THROWS(lexical_cast<unsigned int>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned short>(v), bad_lexical_cast);
+#if defined(BOOST_HAS_LONG_LONG)
+    BOOST_TEST_THROWS(lexical_cast<boost::ulong_long_type>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<boost::long_long_type>(v), bad_lexical_cast);
+#elif defined(BOOST_HAS_MS_INT64)
+    BOOST_TEST_THROWS(lexical_cast<unsigned __int64>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<__int64>(v), bad_lexical_cast);
+#endif
+}
+
+void test_empty_iterator_range()
+{
+
+    boost::iterator_range<char*> v;
+    do_test_on_empty_input(v);
+    BOOST_TEST_EQ(lexical_cast<std::string>(v), std::string());
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+
+    boost::iterator_range<const char*> cv;
+    do_test_on_empty_input(cv);
+    BOOST_TEST_EQ(lexical_cast<std::string>(cv), std::string());
+    BOOST_TEST_THROWS(lexical_cast<char>(cv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(cv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(cv), bad_lexical_cast);
+
+    const boost::iterator_range<const char*> ccv;
+    do_test_on_empty_input(ccv);
+    BOOST_TEST_EQ(lexical_cast<std::string>(ccv), std::string());
+    BOOST_TEST_THROWS(lexical_cast<char>(ccv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(ccv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(ccv), bad_lexical_cast);
+}
+
+void test_empty_string()
+{
+    std::string v;
+    do_test_on_empty_input(v);
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    std::wstring vw;
+    do_test_on_empty_input(vw);
+    BOOST_TEST_THROWS(lexical_cast<wchar_t>(vw), bad_lexical_cast);
+#endif
+
+// Currently, no compiler and STL library fully support char16_t and char32_t
+//#ifndef BOOST_NO_CXX11_CHAR16_T
+//    std::basic_string<char16_t> v16w;
+//    do_test_on_empty_input(v16w);
+//    BOOST_TEST_THROWS(lexical_cast<char16_t>(v16w), bad_lexical_cast);
+//#endif
+//#ifndef BOOST_NO_CXX11_CHAR32_T
+//    std::basic_string<char32_t> v32w;
+//    do_test_on_empty_input(v32w);
+//    BOOST_TEST_THROWS(lexical_cast<char32_t>(v32w), bad_lexical_cast);
+//#endif
+}
+
+void test_empty_user_class()
+{
+    EscapeStruct v("");
+    do_test_on_empty_input(v);
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+}
+
+namespace std {
+inline std::ostream & operator<<(std::ostream & out, const std::vector<long> & v)
+{
+    std::ostream_iterator<long> it(out);
+    std::copy(v.begin(), v.end(), it);
+    BOOST_TEST(out);
+    return out;
+}
+}
+
+void test_empty_vector()
+{
+    std::vector<long> v;
+    do_test_on_empty_input(v);
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+}
+
+
+struct my_string {
+    friend std::ostream &operator<<(std::ostream& sout, my_string const&/* st*/) {
+            return sout << "";
+    }
+};
+
+void test_empty_zero_terminated_string()
+{
+    my_string st;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(st), std::string());;
+}
+
+
+int main()
+{
+    test_empty_iterator_range();
+    test_empty_string();
+    test_empty_user_class();
+    test_empty_vector();
+    test_empty_zero_terminated_string();
+
+    return boost::report_errors();
+}

test/escape_struct.hpp

@@ -0,0 +1,36 @@
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2020-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#ifndef BOOST_LEXICAL_CAST_TEST_ESCAPE_STRUCT_HPP_
+#define BOOST_LEXICAL_CAST_TEST_ESCAPE_STRUCT_HPP_
+
+#include <istream>
+#include <ostream>
+
+struct EscapeStruct
+{
+    EscapeStruct() {}
+    EscapeStruct(const std::string& s)
+        : str_(s)
+    {}
+
+    std::string str_;
+};
+
+inline std::ostream& operator<< (std::ostream& o, const EscapeStruct& rhs)
+{
+    return o << rhs.str_;
+}
+
+inline std::istream& operator>> (std::istream& i, EscapeStruct& rhs)
+{
+    return i >> rhs.str_;
+}
+
+
+#endif // BOOST_LEXICAL_CAST_TEST_ESCAPE_STRUCT_HPP_

test/filesystem_test.cpp

@@ -0,0 +1,60 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2013-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+// Test lexical_cast usage with long filesystem::path. Bug 7704.
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/filesystem/path.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+void test_filesystem()
+{
+    boost::filesystem::path p;
+    std::string s1 = "aaaaaaaaaaaaaaaaaaaaaaa";
+    p = boost::lexical_cast<boost::filesystem::path>(s1);
+    BOOST_TEST(!p.empty());
+    BOOST_TEST_EQ(p, s1);
+    p.clear();
+
+    const char ab[] = "aaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
+    p = boost::lexical_cast<boost::filesystem::path>(ab);
+    BOOST_TEST(!p.empty());
+    BOOST_TEST_EQ(p, ab);
+
+    // Tests for
+    // https://github.com/boostorg/lexical_cast/issues/25
+
+    const char quoted_path[] = "\"/home/my user\"";
+    p = boost::lexical_cast<boost::filesystem::path>(quoted_path);
+    BOOST_TEST(!p.empty());
+    const char unquoted_path[] = "/home/my user";
+    BOOST_TEST_EQ(p, boost::filesystem::path(unquoted_path));
+
+    // Converting back to std::string gives the initial string
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(p), quoted_path);
+
+    try {
+        // Without quotes the path will have only `/home/my` in it.
+        // `user` remains in the stream, so an exception must be thrown.
+        p = boost::lexical_cast<boost::filesystem::path>(unquoted_path);
+        BOOST_TEST(false);
+    } catch (const boost::bad_lexical_cast& ) {
+        // Exception is expected
+    }
+}
+
+int main()
+{
+    test_filesystem();
+
+    return boost::report_errors();
+}
+

test/float_types_test.cpp

@@ -0,0 +1,604 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <sstream>
+#include <type_traits>
+
+#include <boost/cstdint.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+#ifndef BOOST_LEXICAL_CAST_DETAIL_TEST_ON_OLD
+#include <boost/lexical_cast/detail/type_traits.hpp>
+#include <boost/lexical_cast.hpp>
+#else
+// Make sure that tests work the same way on non-optimized version
+#include "lexical_cast_old.hpp"
+#include <boost/lexical_cast/detail/type_traits.hpp>
+#endif
+
+
+#ifndef BOOST_TEST_CLOSE_FRACTION
+// Naiive, but works for most tests in this file 
+#define BOOST_TEST_CLOSE_FRACTION(x, y, eps) \
+    BOOST_TEST(x - y + eps <= eps * 2); \
+    BOOST_TEST(y - x + eps <= eps * 2);
+#endif
+
+#if (defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__NetBSD__) \
+   || (defined(__hppa) && !defined(__OpenBSD__)) || (defined(__NO_LONG_DOUBLE_MATH) && (DBL_MANT_DIG != LDBL_MANT_DIG))) \
+   || defined(__MINGW64__)
+#  define BOOST_LEXICAL_CAST_NO_LONG_DOUBLE_MATH_FUNCTIONS
+#endif
+
+using namespace boost;
+
+
+// Replace "-,999" with "-999".
+template<class CharT>
+std::basic_string<CharT> to_str_gcc_workaround(std::basic_string<CharT> str)
+{
+    std::locale loc;
+    std::numpunct<CharT> const& np = BOOST_USE_FACET(std::numpunct<CharT>, loc);
+    std::ctype<CharT> const& ct = BOOST_USE_FACET(std::ctype<CharT>, loc);
+
+    if(np.grouping().empty())
+        return str;
+
+    CharT prefix[3] = { ct.widen('-'), np.thousands_sep(), CharT() };
+
+    if(str.find(prefix) != 0)
+        return str;
+
+    prefix[1] = CharT();
+    str.replace(0, 2, prefix);
+    return str;
+}
+
+template<class CharT, class T>
+std::basic_string<CharT> to_str(T t)
+{
+    std::basic_ostringstream<CharT> o;
+    o << t;
+    return to_str_gcc_workaround(o.str());
+}
+
+
+template<class T>
+void test_conversion_from_to_float_for_locale()
+{
+    std::locale current_locale;
+    typedef std::numpunct<char> numpunct;
+    numpunct const& np = BOOST_USE_FACET(numpunct, current_locale);
+    if ( !np.grouping().empty() )
+    {
+        BOOST_TEST_THROWS(
+                lexical_cast<T>( std::string("100") + np.thousands_sep() + np.thousands_sep() + "0" )
+                , bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( std::string("100") + np.thousands_sep() ), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( np.thousands_sep() + std::string("100") ), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( std::string("1") + np.thousands_sep() + np.decimal_point() + "e10" ), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( std::string("1e10") + np.thousands_sep() ), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( std::string("1") + np.thousands_sep() + "e10" ), bad_lexical_cast);
+
+        BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( to_str< char >(100000) ), 100000, (std::numeric_limits<T>::epsilon()) );
+        BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( to_str< char >(10000000u) ), 10000000u, (std::numeric_limits<T>::epsilon()) );
+        BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( to_str< char >(100) ), 100, (std::numeric_limits<T>::epsilon()) );
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+        BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( to_str< wchar_t >(100000) ), 100000, (std::numeric_limits<T>::epsilon()) );
+        BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( to_str< wchar_t >(10000000u) ), 10000000u, (std::numeric_limits<T>::epsilon()) );
+        BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( to_str< wchar_t >(100) ), 100, (std::numeric_limits<T>::epsilon()) );
+#endif
+        // Exception must not be thrown, when we are using no separators at all
+        BOOST_TEST_CLOSE_FRACTION( lexical_cast<T>("30000"), static_cast<T>(30000), (std::numeric_limits<T>::epsilon()) );
+    }
+}
+
+
+
+
+/*
+ * Converts char* [and wchar_t*] to float number type and checks, that generated
+ * number does not exceeds allowed epsilon.
+ */
+#ifndef BOOST_LCAST_NO_WCHAR_T
+#define CHECK_CLOSE_ABS_DIFF(VAL,PREFIX)                                                          \
+    converted_val = lexical_cast<test_t>(#VAL);                                                   \
+    BOOST_TEST_CLOSE_FRACTION( (static_cast<bool>(VAL ## L)? VAL ## L : std::numeric_limits<test_t>::epsilon()), \
+                       (converted_val ? converted_val : std::numeric_limits<test_t>::epsilon()),  \
+                       std::numeric_limits<test_t>::epsilon()                                     \
+                     );                                                                           \
+    BOOST_TEST_EQ(converted_val, lexical_cast<test_t>(L## #VAL) );
+
+#else
+#define CHECK_CLOSE_ABS_DIFF(VAL,TYPE)                                                            \
+    converted_val = lexical_cast<test_t>(#VAL);                                                   \
+    BOOST_TEST_CLOSE_FRACTION( (static_cast<bool>(VAL ## L)? VAL ## L : std::numeric_limits<test_t>::epsilon()), \
+                       (converted_val ? converted_val : std::numeric_limits<test_t>::epsilon()),  \
+                       std::numeric_limits<test_t>::epsilon()                                     \
+                     );
+#endif
+
+template <class TestType>
+void test_converion_to_float_types()
+{
+    typedef TestType test_t;
+    test_t converted_val;
+
+    BOOST_TEST_CLOSE_FRACTION(1.0, lexical_cast<test_t>('1'), (std::numeric_limits<test_t>::epsilon()));
+    BOOST_TEST_EQ(0.0, lexical_cast<test_t>('0'));
+
+    unsigned char const uc_one = '1';
+    unsigned char const uc_zero ='0';
+    BOOST_TEST_CLOSE_FRACTION(1.0, lexical_cast<test_t>(uc_one), (std::numeric_limits<test_t>::epsilon()));
+    BOOST_TEST_EQ(0.0, lexical_cast<test_t>(uc_zero));
+
+    signed char const sc_one = '1';
+    signed char const sc_zero ='0';
+    BOOST_TEST_CLOSE_FRACTION(1.0, lexical_cast<test_t>(sc_one), (std::numeric_limits<test_t>::epsilon()));
+    BOOST_TEST_EQ(0.0, lexical_cast<test_t>(sc_zero));
+
+    BOOST_TEST_CLOSE_FRACTION(1e34L, lexical_cast<test_t>( "10000000000000000000000000000000000"), (std::numeric_limits<test_t>::epsilon() * 1e34L) );
+
+//    VC failes the next test
+//    BOOST_TEST_CLOSE_FRACTION(1e-35L, lexical_cast<test_t>("0.00000000000000000000000000000000001"), (std::numeric_limits<test_t>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(
+                                    0.1111111111111111111111111111111111111111111111111111111111111111111111111L
+            , lexical_cast<test_t>("0.1111111111111111111111111111111111111111111111111111111111111111111111111")
+            , (std::numeric_limits<test_t>::epsilon()) );
+
+    CHECK_CLOSE_ABS_DIFF(1,test_t);
+    BOOST_TEST_EQ(0,lexical_cast<test_t>("0"));
+    CHECK_CLOSE_ABS_DIFF(-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1.0, test_t);
+    CHECK_CLOSE_ABS_DIFF(0.0, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1.0,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1e1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1.0e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0.0e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1.0e1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1e-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1.0e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0.0e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1.0e-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1E1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1.0E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0.0E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1.0E1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1E-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(1.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(0.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-1.0E-1, test_t);
+
+    CHECK_CLOSE_ABS_DIFF(.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-.0E-1, test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10.0, test_t);
+    CHECK_CLOSE_ABS_DIFF(00.0, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10.0,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10e1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10.0e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00.0e1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10.0e1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10e-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10.0e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00.0e-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10.0e-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10E1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10.0E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00.0E1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10.0E1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10E-1,test_t);
+
+    CHECK_CLOSE_ABS_DIFF(10.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(00.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10.0E-1, test_t);
+
+    CHECK_CLOSE_ABS_DIFF(-10101.0E-011, test_t);
+    CHECK_CLOSE_ABS_DIFF(-10101093, test_t);
+    CHECK_CLOSE_ABS_DIFF(10101093, test_t);
+
+    CHECK_CLOSE_ABS_DIFF(-.34, test_t);
+    CHECK_CLOSE_ABS_DIFF(.34, test_t);
+    CHECK_CLOSE_ABS_DIFF(.34e10, test_t);
+
+    BOOST_TEST_THROWS(lexical_cast<test_t>("-1.e"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("-1.E"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.e"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.E"), bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0e"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0E"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("10E"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("10e"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0e-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0E-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("10E-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("10e-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("e1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("e-1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("e-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>(".e"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>(".11111111111111111111111111111111111111111111111111111111111111111111ee"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>(".11111111111111111111111111111111111111111111111111111111111111111111e-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("."), bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<test_t>("-B"), bad_lexical_cast);
+
+    // Following two tests are not valid for C++11 compilers
+    //BOOST_TEST_THROWS(lexical_cast<test_t>("0xB"), bad_lexical_cast);
+    //BOOST_TEST_THROWS(lexical_cast<test_t>("0x0"), bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<test_t>("--1.0"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0e--1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0.0"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1e1e1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0e-1e-1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>(" 1.0"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1.0 "), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>(""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("-"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>('\0'), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>('-'), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>('.'), bad_lexical_cast);
+}
+
+template <class T>
+void test_float_typess_for_overflows()
+{
+    typedef T test_t;
+    test_t minvalue = (std::numeric_limits<test_t>::min)();
+    std::string s_min_value = lexical_cast<std::string>(minvalue);
+    BOOST_TEST_CLOSE_FRACTION(minvalue, lexical_cast<test_t>(minvalue), (std::numeric_limits<test_t>::epsilon()));
+    BOOST_TEST_CLOSE_FRACTION(minvalue, lexical_cast<test_t>(s_min_value), (std::numeric_limits<test_t>::epsilon() * 2));
+
+    test_t maxvalue = (std::numeric_limits<test_t>::max)();
+    std::string s_max_value = lexical_cast<std::string>(maxvalue);
+    BOOST_TEST_CLOSE_FRACTION(maxvalue, lexical_cast<test_t>(maxvalue), (std::numeric_limits<test_t>::epsilon()));
+    BOOST_TEST_CLOSE_FRACTION(maxvalue, lexical_cast<test_t>(s_max_value), (std::numeric_limits<test_t>::epsilon()));
+
+#ifndef _LIBCPP_VERSION
+    // libc++ had a bug in implementation of stream conversions for values that must be represented as infinity.
+    // http://llvm.org/bugs/show_bug.cgi?id=15723#c4
+    BOOST_TEST_THROWS(lexical_cast<test_t>(s_max_value+"1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>(s_max_value+"9"), bad_lexical_cast);
+
+    // VC9 can fail the following tests on floats and doubles when using stingstream...
+    BOOST_TEST_THROWS(lexical_cast<test_t>("1"+s_max_value), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<test_t>("9"+s_max_value), bad_lexical_cast);
+#endif
+#if !(defined(_LIBCPP_VERSION) && defined(BOOST_LEXICAL_CAST_DETAIL_TEST_ON_OLD))
+    if ( std::is_same<test_t,float>::value )
+    {
+        BOOST_TEST_THROWS(lexical_cast<test_t>( (std::numeric_limits<double>::max)() ), bad_lexical_cast);
+        BOOST_TEST(
+                (std::numeric_limits<double>::min)() - std::numeric_limits<test_t>::epsilon()
+                <= lexical_cast<test_t>( (std::numeric_limits<double>::min)() )
+                && lexical_cast<test_t>( (std::numeric_limits<double>::min)() )
+                <= (std::numeric_limits<double>::min)() + std::numeric_limits<test_t>::epsilon()
+        );
+
+        BOOST_TEST(
+                (std::numeric_limits<double>::min)() / 2 - std::numeric_limits<test_t>::epsilon()
+                <= lexical_cast<test_t>( (std::numeric_limits<double>::min)() / 2 )
+                && lexical_cast<test_t>( (std::numeric_limits<double>::min)() / 2 )
+                <= (std::numeric_limits<double>::min)() / 2 + std::numeric_limits<test_t>::epsilon()
+        );
+    }
+
+    if ( sizeof(test_t) < sizeof(long double) )
+    {
+        BOOST_TEST_THROWS(lexical_cast<test_t>( (std::numeric_limits<long double>::max)() ), bad_lexical_cast);
+        BOOST_TEST(
+                (std::numeric_limits<long double>::min)() - std::numeric_limits<test_t>::epsilon()
+                <= lexical_cast<test_t>( (std::numeric_limits<long double>::min)() )
+                && lexical_cast<test_t>( (std::numeric_limits<long double>::min)() )
+                <= (std::numeric_limits<long double>::min)() + std::numeric_limits<test_t>::epsilon()
+        );
+
+        BOOST_TEST(
+                (std::numeric_limits<long double>::min)() / 2 - std::numeric_limits<test_t>::epsilon()
+                <= lexical_cast<test_t>( (std::numeric_limits<long double>::min)() / 2 )
+                && lexical_cast<test_t>( (std::numeric_limits<long double>::min)() / 2 )
+                <= (std::numeric_limits<long double>::min)() / 2 + std::numeric_limits<test_t>::epsilon()
+        );
+    }
+#endif
+}
+
+#undef CHECK_CLOSE_ABS_DIFF
+
+// Epsilon is multiplied by 2 because of two lexical conversions
+#define TEST_TO_FROM_CAST_AROUND_TYPED(VAL,STRING_TYPE)                             \
+    test_value = VAL + std::numeric_limits<test_t>::epsilon() * i ;                 \
+    converted_val = lexical_cast<test_t>( lexical_cast<STRING_TYPE>(test_value) );  \
+    BOOST_TEST_CLOSE_FRACTION(                                                     \
+            test_value,                                                             \
+            converted_val,                                                          \
+            std::numeric_limits<test_t>::epsilon() * 2                              \
+        );
+
+/*
+ * For interval [ from_mult*epsilon+VAL, to_mult*epsilon+VAL ], converts float type
+ * numbers to string[wstring] and then back to float type, then compares initial
+ * values and generated.
+ * Step is epsilon
+ */
+#ifndef BOOST_LCAST_NO_WCHAR_T
+#   define TEST_TO_FROM_CAST_AROUND(VAL)                    \
+    for(i=from_mult; i<=to_mult; ++i) {                     \
+        TEST_TO_FROM_CAST_AROUND_TYPED(VAL, std::string)    \
+        TEST_TO_FROM_CAST_AROUND_TYPED(VAL, std::wstring)   \
+    }
+#else
+#   define TEST_TO_FROM_CAST_AROUND(VAL)                    \
+    for(i=from_mult; i<=to_mult; ++i) {                     \
+        TEST_TO_FROM_CAST_AROUND_TYPED(VAL, std::string)    \
+    }
+#endif
+
+template <class TestType>
+void test_converion_from_to_float_types()
+{
+    typedef TestType test_t;
+    test_t test_value;
+    test_t converted_val;
+
+    int i;
+    int from_mult = -50;
+    int to_mult = 50;
+
+    TEST_TO_FROM_CAST_AROUND( 0.0 );
+
+    long double val1;
+    for(val1 = 1.0e-10L; val1 < 1e11; val1*=10 )
+        TEST_TO_FROM_CAST_AROUND( val1 );
+
+    long double val2;
+    for(val2 = -1.0e-10L; val2 > -1e11; val2*=10 )
+        TEST_TO_FROM_CAST_AROUND( val2 );
+
+    from_mult = -100;
+    to_mult = 0;
+    TEST_TO_FROM_CAST_AROUND( (std::numeric_limits<test_t>::max)() );
+
+    from_mult = 0;
+    to_mult = 100;
+    TEST_TO_FROM_CAST_AROUND( (std::numeric_limits<test_t>::min)() );
+}
+
+#undef TEST_TO_FROM_CAST_AROUND
+#undef TEST_TO_FROM_CAST_AROUND_TYPED
+
+
+template<class T, class CharT>
+void test_conversion_from_float_to_char(CharT zero)
+{
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(0)) == zero + 0);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(1)) == zero + 1);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(2)) == zero + 2);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(3)) == zero + 3);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(4)) == zero + 4);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(5)) == zero + 5);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(6)) == zero + 6);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(7)) == zero + 7);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(8)) == zero + 8);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(9)) == zero + 9);
+
+    BOOST_TEST_THROWS(lexical_cast<CharT>(static_cast<T>(10)), bad_lexical_cast);
+
+    T t = (std::numeric_limits<T>::max)();
+    BOOST_TEST_THROWS(lexical_cast<CharT>(t), bad_lexical_cast);
+}
+
+template<class T, class CharT>
+void test_conversion_from_char_to_float(CharT zero)
+{
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 0)), static_cast<T>(0), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 1)), static_cast<T>(1), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 2)), static_cast<T>(2), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 3)), static_cast<T>(3), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 4)), static_cast<T>(4), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 5)), static_cast<T>(5), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 6)), static_cast<T>(6), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 7)), static_cast<T>(7), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 8)), static_cast<T>(8), (std::numeric_limits<T>::epsilon()) );
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>( static_cast<CharT>(zero + 9)), static_cast<T>(9), (std::numeric_limits<T>::epsilon()) );
+
+    BOOST_TEST_THROWS(lexical_cast<T>( static_cast<CharT>(zero + 10)), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>( static_cast<CharT>(zero - 1)), bad_lexical_cast);
+}
+
+struct restore_oldloc
+{
+    std::locale oldloc;
+    ~restore_oldloc() { std::locale::global(oldloc); }
+};
+
+template<class T>
+void test_conversion_from_to_float()
+{    char const zero = '0';
+    signed char const szero = '0';
+    unsigned char const uzero = '0';
+    test_conversion_from_float_to_char<T>(zero);
+    test_conversion_from_char_to_float<T>(zero);
+    test_conversion_from_float_to_char<T>(szero);
+    test_conversion_from_char_to_float<T>(szero);
+    test_conversion_from_float_to_char<T>(uzero);
+    test_conversion_from_char_to_float<T>(uzero);
+    #if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    wchar_t const wzero = L'0';
+    test_conversion_from_float_to_char<T>(wzero);
+    test_conversion_from_char_to_float<T>(wzero);
+    #endif
+
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>("+1"), 1, std::numeric_limits<T>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<T>("+9"), 9, std::numeric_limits<T>::epsilon());
+
+    BOOST_TEST_THROWS(lexical_cast<T>("++1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("-+9"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("--1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("+-9"), bad_lexical_cast);
+
+    test_converion_to_float_types<T>();
+    test_float_typess_for_overflows<T>();
+    test_converion_from_to_float_types<T>();
+
+
+    typedef std::numpunct<char> numpunct;
+
+    restore_oldloc guard;
+    std::locale const& oldloc = guard.oldloc;
+
+    std::string grouping1 = BOOST_USE_FACET(numpunct, oldloc).grouping();
+    std::string grouping2(grouping1);
+
+    test_conversion_from_to_float_for_locale<T>();
+
+    try
+    {
+        std::locale newloc("");
+        std::locale::global(newloc);
+
+        grouping2 = BOOST_USE_FACET(numpunct, newloc).grouping();
+    }
+    catch(std::exception const& ex)
+    {
+        std::string msg("Failed to set system locale: ");
+        msg += ex.what();
+        std::cerr << msg;
+    }
+
+    if(grouping1 != grouping2)
+        test_conversion_from_to_float_for_locale<T>();
+
+    if(grouping1.empty() && grouping2.empty())
+        std::cerr << "Formatting with thousands_sep has not been tested";
+}
+
+
+
+void test_conversion_from_to_float()
+{
+    test_conversion_from_to_float<float>();
+}
+void test_conversion_from_to_double()
+{
+    test_conversion_from_to_float<double>();
+}
+void test_conversion_from_to_long_double()
+{
+// We do not run tests on compilers and Standard Libraries with poor support of long double
+#if !defined(BOOST_LEXICAL_CAST_NO_LONG_DOUBLE_MATH_FUNCTIONS)
+    test_conversion_from_to_float<long double>();
+#endif
+    BOOST_TEST(true);
+}
+
+template <class Integral, class Float>
+void test_conversion_integral_float()
+{
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>(static_cast<Float>(1)), static_cast<Float>(1), std::numeric_limits<Float>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>(static_cast<Float>(1.1234)), static_cast<Float>(1.1234), std::numeric_limits<Float>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>(static_cast<Float>(-1.1234)), static_cast<Float>(-1.1234), std::numeric_limits<Float>::epsilon());
+
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>(static_cast<Integral>(0)), static_cast<Float>(0), std::numeric_limits<Float>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>(static_cast<Integral>(1)), static_cast<Float>(1), std::numeric_limits<Float>::epsilon());
+
+#ifndef __CYGWIN__
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>((std::numeric_limits<Integral>::max)()), static_cast<Float>((std::numeric_limits<Integral>::max)()), std::numeric_limits<Float>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(lexical_cast<Float>((std::numeric_limits<Integral>::min)()), static_cast<Float>((std::numeric_limits<Integral>::min)()), std::numeric_limits<Float>::epsilon());
+#endif
+
+    BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(0.0)), 0);
+    BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(1.0)), 1);
+    BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(8.0)), 8);
+    BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(16.0)), 16);
+
+    if (boost::detail::lcast::is_signed<Integral>::value) {
+        BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(-1.0)), -1);
+        BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(-8.0)), -8);
+        BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(-16.0)), -16);
+    } else {
+        BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(-1.0)), (std::numeric_limits<Integral>::max)());
+        BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(-8.0)), (std::numeric_limits<Integral>::max)() - 7);
+        BOOST_TEST_EQ(lexical_cast<Integral>(static_cast<Float>(-16.0)), (std::numeric_limits<Integral>::max)() - 15);
+    }
+
+    BOOST_TEST_THROWS(lexical_cast<Integral>(static_cast<Float>(0.5)), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(static_cast<Float>(-0.5)), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(static_cast<Float>(1.5)), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(static_cast<Float>(-1.5)), bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<Integral>((std::numeric_limits<Float>::min)()), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>((std::numeric_limits<Float>::max)()), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>((std::numeric_limits<Float>::epsilon)()), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>((std::numeric_limits<Float>::lowest)()), bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<Float>::quiet_NaN()), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<Float>::quiet_NaN()), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<Float>::infinity()), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<Float>::infinity()), bad_lexical_cast);
+}
+
+
+int main()
+{
+    test_conversion_from_to_float();
+    test_conversion_from_to_double();
+    test_conversion_from_to_long_double();
+
+    test_conversion_integral_float<int, float>();
+    test_conversion_integral_float<int, double>();
+    test_conversion_integral_float<unsigned short, float>();
+    test_conversion_integral_float<unsigned short, double>();
+    test_conversion_integral_float<short, float>();
+    test_conversion_integral_float<short, double>();
+    test_conversion_integral_float<long int, float>();
+    test_conversion_integral_float<long int, double>();
+    test_conversion_integral_float<long long, float>();
+    test_conversion_integral_float<long long, double>();
+    test_conversion_integral_float<unsigned long long, float>();
+    test_conversion_integral_float<unsigned long long, double>();
+
+    return boost::report_errors();
+}

test/from_volatile.cpp

@@ -0,0 +1,16 @@
+//  Copyright Antony Polukhin, 2013-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/lexical_cast.hpp>
+#include <string>
+
+int main()
+{
+    volatile int i = 42;
+    boost::lexical_cast<std::string>(i);
+    return 1;
+}
+

test/implicit_cast.cpp

@@ -1,32 +0,0 @@
-// Copyright David Abrahams 2003.
-// Distributed under the Boost Software License, Version 1.0. (See
-// accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-
-#include <boost/implicit_cast.hpp>
-#include <boost/detail/lightweight_test.hpp>
-#include <boost/type.hpp>
-using boost::implicit_cast;
-using boost::type;
-
-template <class T>
-type<T> check_return(T) { return type<T>(); }
-
-struct foo
-{
-    foo(char const*) {}
-    operator long() const { return 0; }
-};
-
-typedef type<long> long_type;
-typedef type<foo> foo_type;
-
-int main()
-{
-    type<long> x = check_return(boost::implicit_cast<long>(1));
-    BOOST_TEST(boost::implicit_cast<long>(1) == 1L);
-
-    type<foo> f = check_return(boost::implicit_cast<foo>("hello"));
-    type<long> z = check_return(boost::implicit_cast<long>(foo("hello")));
-    return boost::report_errors();
-}

test/implicit_cast_fail.cpp

@@ -1,22 +0,0 @@
-// Copyright David Abrahams 2003.
-// Distributed under the Boost Software License, Version 1.0. (See
-// accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
-
-#include <boost/implicit_cast.hpp>
-#include <boost/type.hpp>
-
-#define BOOST_INCLUDE_MAIN
-#include <boost/test/test_tools.hpp>
-
-using boost::implicit_cast;
-
-struct foo
-{
-    explicit foo(char const*) {}
-};
-
-int test_main(int, char*[])
-{
-    foo x = implicit_cast<foo>("foobar");
-}

test/implicit_convert.cpp

@@ -0,0 +1,63 @@
+//  Copyright Antony Polukhin, 2023-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+struct oops {
+    operator int () const {
+        return 41;
+    }
+};
+
+inline std::ostream& operator<<(std::ostream& os, const oops&) {
+    return os << 42;
+}
+
+struct oops2 {
+    operator double () const {
+        return 1.12;
+    }
+};
+
+inline std::ostream& operator<<(std::ostream& os, const oops2&) {
+    return os << 2;
+}
+
+struct Value {
+    explicit Value(double x) : x(x) {}
+
+    operator double() const {
+        return x;
+    }
+
+    double x;
+};
+
+int main() {
+    BOOST_TEST_EQ(boost::lexical_cast<int>(oops{}), 42);
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(oops{}), "42");
+
+    BOOST_TEST_EQ(boost::lexical_cast<double>(oops2{}), 2);
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(oops2{}), "2");
+
+    Value longer_that_1_digit(128);
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(longer_that_1_digit), "128");
+
+    // iostreams have default precision 6, see [basic.ios.cons]
+    const double precision_more_than_6_digits = 1.23456789123;
+    // At the moment we do not set the precision for types that use conversion
+    // operators for ostreaming, so the below test pass. We do not set precision
+    // for user provided `operator<<`, types with conversion operators follow
+    // the same design decision for now.
+    BOOST_TEST_NE(
+        boost::lexical_cast<std::string>(Value(precision_more_than_6_digits)),
+        boost::lexical_cast<std::string>(precision_more_than_6_digits)
+    );
+
+    return boost::report_errors();
+}

test/inf_nan_test.cpp

@@ -0,0 +1,242 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <type_traits>
+
+#include <boost/core/cmath.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+using namespace boost;
+
+template <class T>
+bool is_pos_inf(T value)
+{
+    return (boost::core::isinf)(value) && !(boost::core::signbit)(value);
+}
+
+template <class T>
+bool is_neg_inf(T value)
+{
+    return (boost::core::isinf)(value) && (boost::core::signbit)(value);
+}
+
+template <class T>
+bool is_pos_nan(T value)
+{
+    return (boost::core::isnan)(value) && !(boost::core::signbit)(value);
+}
+
+template <class T>
+bool is_neg_nan(T value)
+{
+    /* There is some strange behaviour on Itanium platform with -nan nuber for long double.
+    * It is a IA64 feature, or it is a boost::math feature, not a lexical_cast bug */
+#if defined(__ia64__) || defined(_M_IA64)
+    return (boost::core::isnan)(value)
+            && ( std::is_same<T, long double >::value || (boost::core::signbit)(value) );
+#else
+    return (boost::core::isnan)(value) && (boost::core::signbit)(value);
+#endif
+}
+
+template <class T>
+void test_inf_nan_templated()
+{
+    typedef T test_t;
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("inf") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("INF") ) );
+
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>("-inf") ) );
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>("-INF") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("+inf") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("+INF") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("infinity") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("INFINITY") ) );
+
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>("-infinity") ) );
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>("-INFINITY") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("+infinity") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("+INFINITY") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("iNfiNity") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>("INfinity") ) );
+
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>("-inFINITY") ) );
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>("-INFINITY") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("nan") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("NAN") ) );
+
+    BOOST_TEST( is_neg_nan( lexical_cast<test_t>("-nan") ) );
+    BOOST_TEST( is_neg_nan( lexical_cast<test_t>("-NAN") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("+nan") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("+NAN") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("nAn") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("NaN") ) );
+
+    BOOST_TEST( is_neg_nan( lexical_cast<test_t>("-nAn") ) );
+    BOOST_TEST( is_neg_nan( lexical_cast<test_t>("-NaN") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("+Nan") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("+nAN") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("nan()") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>("NAN(some string)") ) );
+    BOOST_TEST_THROWS( lexical_cast<test_t>("NAN(some string"), bad_lexical_cast );
+
+    BOOST_TEST(lexical_cast<std::string>( (boost::core::copysign)(std::numeric_limits<test_t >::infinity(), static_cast<test_t>(-1.0)))
+                == "-inf" );
+    BOOST_TEST(lexical_cast<std::string>( std::numeric_limits<test_t >::infinity()) == "inf" );
+    BOOST_TEST(lexical_cast<std::string>( std::numeric_limits<test_t >::quiet_NaN()) == "nan" );
+#if !defined(__ia64__) && !defined(_M_IA64)
+    BOOST_TEST(lexical_cast<std::string>(
+                (boost::core::copysign)(std::numeric_limits<test_t >::quiet_NaN(), static_cast<test_t>(-1.0)))
+                == "-nan" );
+#endif
+
+#ifndef  BOOST_LCAST_NO_WCHAR_T
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"inf") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"INF") ) );
+
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>(L"-inf") ) );
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>(L"-INF") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"+inf") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"+INF") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"infinity") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"INFINITY") ) );
+
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>(L"-infinity") ) );
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>(L"-INFINITY") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"+infinity") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"+INFINITY") ) );
+
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>(L"-infINIty") ) );
+    BOOST_TEST( is_neg_inf( lexical_cast<test_t>(L"-INFiniTY") ) );
+
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"+inFINIty") ) );
+    BOOST_TEST( is_pos_inf( lexical_cast<test_t>(L"+INfinITY") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>(L"nan") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>(L"NAN") ) );
+
+    BOOST_TEST( is_neg_nan( lexical_cast<test_t>(L"-nan") ) );
+    BOOST_TEST( is_neg_nan( lexical_cast<test_t>(L"-NAN") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>(L"+nan") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>(L"+NAN") ) );
+
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>(L"nan()") ) );
+    BOOST_TEST( is_pos_nan( lexical_cast<test_t>(L"NAN(some string)") ) );
+    BOOST_TEST_THROWS( lexical_cast<test_t>(L"NAN(some string"), bad_lexical_cast );
+
+    BOOST_TEST(lexical_cast<std::wstring>( (boost::core::copysign)(std::numeric_limits<test_t >::infinity(), static_cast<test_t>(-1.0)))
+                == L"-inf" );
+    BOOST_TEST(lexical_cast<std::wstring>( std::numeric_limits<test_t >::infinity()) == L"inf" );
+    BOOST_TEST(lexical_cast<std::wstring>( std::numeric_limits<test_t >::quiet_NaN()) == L"nan" );
+#if !defined(__ia64__) && !defined(_M_IA64)
+    BOOST_TEST(lexical_cast<std::wstring>(
+                (boost::core::copysign)(std::numeric_limits<test_t >::quiet_NaN(), static_cast<test_t>(-1.0)))
+                == L"-nan" );
+#endif
+
+#endif
+}
+
+void test_inf_nan_float()
+{
+    test_inf_nan_templated<float >();
+
+    BOOST_TEST(is_pos_nan(lexical_cast<float>(std::numeric_limits<float>::quiet_NaN())));
+    BOOST_TEST(is_neg_nan(lexical_cast<float>(-std::numeric_limits<float>::quiet_NaN())));
+    BOOST_TEST(is_pos_inf(lexical_cast<float>(std::numeric_limits<float>::infinity())));
+    BOOST_TEST(is_neg_inf(lexical_cast<float>(-std::numeric_limits<float>::infinity())));
+
+    BOOST_TEST(is_pos_nan(lexical_cast<float>(std::numeric_limits<double>::quiet_NaN())));
+    BOOST_TEST(is_neg_nan(lexical_cast<float>(-std::numeric_limits<double>::quiet_NaN())));
+    BOOST_TEST(is_pos_inf(lexical_cast<float>(std::numeric_limits<double>::infinity())));
+    BOOST_TEST(is_neg_inf(lexical_cast<float>(-std::numeric_limits<double>::infinity())));
+}
+
+void test_inf_nan_double()
+{
+    test_inf_nan_templated<double >();
+
+    BOOST_TEST(is_pos_nan(lexical_cast<double>(std::numeric_limits<float>::quiet_NaN())));
+    BOOST_TEST(is_neg_nan(lexical_cast<double>(-std::numeric_limits<float>::quiet_NaN())));
+    BOOST_TEST(is_pos_inf(lexical_cast<double>(std::numeric_limits<float>::infinity())));
+    BOOST_TEST(is_neg_inf(lexical_cast<double>(-std::numeric_limits<float>::infinity())));
+
+    BOOST_TEST(is_pos_nan(lexical_cast<double>(std::numeric_limits<double>::quiet_NaN())));
+    BOOST_TEST(is_neg_nan(lexical_cast<double>(-std::numeric_limits<double>::quiet_NaN())));
+    BOOST_TEST(is_pos_inf(lexical_cast<double>(std::numeric_limits<double>::infinity())));
+    BOOST_TEST(is_neg_inf(lexical_cast<double>(-std::numeric_limits<double>::infinity())));
+
+    BOOST_TEST(is_pos_nan(lexical_cast<double>(std::numeric_limits<long double>::quiet_NaN())));
+    BOOST_TEST(is_neg_nan(lexical_cast<double>(-std::numeric_limits<long double>::quiet_NaN())));
+    BOOST_TEST(is_pos_inf(lexical_cast<double>(std::numeric_limits<long double>::infinity())));
+    BOOST_TEST(is_neg_inf(lexical_cast<double>(-std::numeric_limits<long double>::infinity())));
+}
+
+void test_inf_nan_long_double()
+{
+// We do not run tests on compilers with bugs
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+    test_inf_nan_templated<long double >();
+#endif
+    BOOST_TEST(true);
+}
+
+template <class Integral>
+void test_inf_nan_to_integral()
+{
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<float>::quiet_NaN()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<float>::quiet_NaN()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<float>::infinity()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<float>::infinity()), boost::bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<double>::quiet_NaN()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<double>::quiet_NaN()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<double>::infinity()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<double>::infinity()), boost::bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<long double>::quiet_NaN()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<long double>::quiet_NaN()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(std::numeric_limits<long double>::infinity()), boost::bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<Integral>(-std::numeric_limits<long double>::infinity()), boost::bad_lexical_cast);
+}
+
+int main()
+{
+    test_inf_nan_float();
+    test_inf_nan_double();
+    test_inf_nan_long_double();
+
+    test_inf_nan_to_integral<int>();
+    test_inf_nan_to_integral<bool>();
+    test_inf_nan_to_integral<short>();
+
+    return boost::report_errors();
+}

test/integral_types_test.cpp

@@ -0,0 +1,657 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Terje Sletteb and Kevlin Henney, 2005.
+//  Copyright Alexander Nasonov, 2006.
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+// Note: The unit test no longer compile on MSVC 6, but lexical_cast itself works for it.
+
+//
+// We need this #define before any #includes: otherwise msvc will emit warnings
+// deep within std::string, resulting from our (perfectly legal) use of basic_string
+// with a custom traits class:
+//
+#define _SCL_SECURE_NO_WARNINGS
+
+#include <boost/cstdint.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast/detail/type_traits.hpp>
+
+#include <boost/type_traits/integral_promotion.hpp>
+#include <string>
+#include <sstream>
+#include <vector>
+#include <memory>
+#include <type_traits>
+
+#include <boost/lexical_cast.hpp>
+
+#if (defined(BOOST_HAS_LONG_LONG) || defined(BOOST_HAS_MS_INT64)) \
+    && !(defined(BOOST_MSVC) && BOOST_MSVC < 1300)
+#define LCAST_TEST_LONGLONG
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+// There's no typeinfo for unsigned __int128 in Xcode_15.0.1
+#if defined(BOOST_HAS_INT128) && !defined(BOOST_LEXICAL_CAST_TEST_NO_128_INTS) && !defined(__APPLE__)
+# define BOOST_LCAST_TEST_128 1
+#endif
+
+// Test all 65536 values if true:
+bool const lcast_test_small_integral_types_completely = false;
+
+// lcast_integral_test_counter: use when testing all values of an integral
+// types is not possible. Max. portable value is 32767.
+int const lcast_integral_test_counter=500;
+
+using namespace boost;
+
+template<class T, class CharT>
+void test_conversion_from_integral_to_char(CharT zero)
+{
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(0)) == zero + 0);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(1)) == zero + 1);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(2)) == zero + 2);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(3)) == zero + 3);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(4)) == zero + 4);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(5)) == zero + 5);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(6)) == zero + 6);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(7)) == zero + 7);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(8)) == zero + 8);
+    BOOST_TEST(lexical_cast<CharT>(static_cast<T>(9)) == zero + 9);
+
+    BOOST_TEST_THROWS(lexical_cast<CharT>(static_cast<T>(10)), bad_lexical_cast);
+
+    T t = (std::numeric_limits<T>::max)();
+    BOOST_TEST_THROWS(lexical_cast<CharT>(t), bad_lexical_cast);
+}
+
+template<class T, class CharT>
+void test_conversion_from_char_to_integral(CharT zero)
+{
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 0)) == static_cast<T>(0) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 1)) == static_cast<T>(1) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 2)) == static_cast<T>(2) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 3)) == static_cast<T>(3) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 4)) == static_cast<T>(4) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 5)) == static_cast<T>(5) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 6)) == static_cast<T>(6) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 7)) == static_cast<T>(7) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 8)) == static_cast<T>(8) );
+    BOOST_TEST(lexical_cast<T>( static_cast<CharT>(zero + 9)) == static_cast<T>(9) );
+
+    BOOST_TEST_THROWS(lexical_cast<T>( static_cast<CharT>(zero + 10)), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>( static_cast<CharT>(zero - 1)), bad_lexical_cast);
+}
+
+template<class T>
+void test_conversion_from_integral_to_integral()
+{
+    T t = 0;
+    BOOST_TEST(lexical_cast<T>(t) == t);
+
+    // Next two variables are used to suppress warnings.
+    int st = 32767; unsigned int ut = st;
+    t = st;
+    BOOST_TEST(lexical_cast<short>(t) == st);
+    BOOST_TEST(lexical_cast<unsigned short>(t) == ut);
+    BOOST_TEST(lexical_cast<int>(t) == st);
+    BOOST_TEST(lexical_cast<unsigned int>(t) == ut);
+    BOOST_TEST(lexical_cast<long>(t) == st);
+    BOOST_TEST(lexical_cast<unsigned long>(t) == ut);
+
+    t = (std::numeric_limits<T>::max)();
+    BOOST_TEST(lexical_cast<T>(t) == t);
+
+    t = (std::numeric_limits<T>::min)();
+    BOOST_TEST(lexical_cast<T>(t) == t);
+}
+
+
+
+
+// Replace "-,999" with "-999".
+template<class CharT>
+std::basic_string<CharT> to_str_gcc_workaround(std::basic_string<CharT> str)
+{
+    std::locale loc;
+    std::numpunct<CharT> const& np = BOOST_USE_FACET(std::numpunct<CharT>, loc);
+    std::ctype<CharT> const& ct = BOOST_USE_FACET(std::ctype<CharT>, loc);
+
+    if(np.grouping().empty())
+        return str;
+
+    CharT prefix[3] = { ct.widen('-'), np.thousands_sep(), CharT() };
+
+    if(str.find(prefix) != 0)
+        return str;
+
+    prefix[1] = CharT();
+    str.replace(0, 2, prefix);
+    return str;
+}
+
+template<class CharT, class T>
+std::basic_string<CharT> to_str(T t)
+{
+    std::basic_ostringstream<CharT> o;
+    o << t;
+    return to_str_gcc_workaround(o.str());
+}
+
+
+template<class T, class CharT>
+void test_conversion_from_integral_to_string(CharT)
+{
+    typedef std::numeric_limits<T> limits;
+    typedef std::basic_string<CharT> string_type;
+
+    T t;
+
+    t = (limits::min)();
+    BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+    t = (limits::max)();
+    BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+    if(limits::digits <= 16 && lcast_test_small_integral_types_completely)
+        // min and max have already been tested.
+        for(t = 1 + (limits::min)(); t != (limits::max)(); ++t)
+            BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+    else
+    {
+        T const min_val = (limits::min)();
+        T const max_val = (limits::max)();
+        T const half_max_val = max_val / 2;
+        T const cnt = lcast_integral_test_counter; // to suppress warnings
+        T const counter = cnt < half_max_val ? cnt : half_max_val;
+
+        T i = 0;
+
+        // Test values around min:
+        t = min_val;
+        for(i = 0; i < counter; ++i, ++t)
+            BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+        // Test values around max:
+        t = max_val;
+        for(i = 0; i < counter; ++i, --t)
+            BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+        // Test values around zero:
+        if(limits::is_signed)
+            for(t = static_cast<T>(-counter); t < static_cast<T>(counter); ++t)
+                BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+
+        // Test values around 100, 1000, 10000, ...
+        T ten_power = 100;
+        for(int e = 2; e < limits::digits10; ++e, ten_power *= 10)
+        {
+            // ten_power + 100 probably never overflows
+            for(t = ten_power - 100; t != ten_power + 100; ++t)
+                BOOST_TEST(lexical_cast<string_type>(t) == to_str<CharT>(t));
+        }
+    }
+}
+
+template<class T, class CharT>
+void test_conversion_from_string_to_integral(CharT)
+{
+    typedef std::numeric_limits<T> limits;
+    typedef std::basic_string<CharT> string_type;
+
+    string_type s;
+    string_type const zero = to_str<CharT>(0);
+    string_type const nine = to_str<CharT>(9);
+    T const min_val = (limits::min)();
+    T const max_val = (limits::max)();
+
+    s = to_str<CharT>(min_val);
+    BOOST_TEST_EQ(lexical_cast<T>(s), min_val);
+    if(limits::is_signed)
+    {
+        BOOST_TEST_THROWS(lexical_cast<T>(s + zero), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>(s + nine), bad_lexical_cast);
+    }
+
+    s = to_str<CharT>(max_val);
+    BOOST_TEST_EQ(lexical_cast<T>(s), max_val);
+    {
+        BOOST_TEST_THROWS(lexical_cast<T>(s + zero), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>(s + nine), bad_lexical_cast);
+
+        s = to_str<CharT>(max_val);
+        for (int i =1; i <=10; ++i) {
+            s[s.size()-1] += 1;
+            BOOST_TEST_THROWS(lexical_cast<T>( s ), bad_lexical_cast);
+        }
+
+        s = to_str<CharT>(max_val);
+        std::locale loc;
+        typedef std::numpunct<char> numpunct;
+        if ( BOOST_USE_FACET(numpunct, loc).grouping().empty() ) {
+            // Following tests work well for locale C
+            BOOST_TEST_EQ(lexical_cast<T>(to_str<CharT>(0)+s), max_val);
+            BOOST_TEST_EQ(lexical_cast<T>(to_str<CharT>(0)+to_str<CharT>(0)+s), max_val);
+            BOOST_TEST_EQ(lexical_cast<T>(to_str<CharT>(0)+to_str<CharT>(0)+to_str<CharT>(0)+s), max_val);
+        }
+
+        for (int i =1; i <=256; ++i) {
+            BOOST_TEST_THROWS(lexical_cast<T>( to_str<CharT>(i)+s ), bad_lexical_cast);
+        }
+
+        typedef typename boost::integral_promotion<T>::type promoted;
+        if ( !(std::is_same<T, promoted>::value) )
+        {
+            promoted prom = max_val;
+            s = to_str<CharT>(max_val);
+            for (int i =1; i <=256; ++i) {
+                BOOST_TEST_THROWS(lexical_cast<T>( to_str<CharT>(prom+i) ), bad_lexical_cast);
+                BOOST_TEST_THROWS(lexical_cast<T>( to_str<CharT>(i)+s ), bad_lexical_cast);
+            }
+        }
+    }
+
+    if(limits::digits <= 16 && lcast_test_small_integral_types_completely)
+        // min and max have already been tested.
+        for(T t = 1 + min_val; t != max_val; ++t)
+            BOOST_TEST(lexical_cast<T>(to_str<CharT>(t)) == t);
+    else
+    {
+        T const half_max_val = max_val / 2;
+        T const cnt = lcast_integral_test_counter; // to suppress warnings
+        T const counter = cnt < half_max_val ? cnt : half_max_val;
+
+        T t;
+        T i;
+
+        // Test values around min:
+        t = min_val;
+        for(i = 0; i < counter; ++i, ++t)
+            BOOST_TEST(lexical_cast<T>(to_str<CharT>(t)) == t);
+
+        // Test values around max:
+        t = max_val;
+        for(i = 0; i < counter; ++i, --t)
+            BOOST_TEST(lexical_cast<T>(to_str<CharT>(t)) == t);
+
+        // Test values around zero:
+        if(limits::is_signed)
+            for(t = static_cast<T>(-counter); t < static_cast<T>(counter); ++t)
+                BOOST_TEST(lexical_cast<T>(to_str<CharT>(t)) == t);
+
+        // Test values around 100, 1000, 10000, ...
+        T ten_power = 100;
+        for(int e = 2; e < limits::digits10; ++e, ten_power *= 10)
+        {
+            // ten_power + 100 probably never overflows
+            for(t = ten_power - 100; t != ten_power + 100; ++t)
+                BOOST_TEST(lexical_cast<T>(to_str<CharT>(t)) == t);
+        }
+    }
+}
+
+template<class T>
+void test_conversion_from_to_integral_for_locale()
+{
+    std::locale current_locale;
+    typedef std::numpunct<char> numpunct;
+    numpunct const& np = BOOST_USE_FACET(numpunct, current_locale);
+    if ( !np.grouping().empty() )
+    {
+        BOOST_TEST_THROWS(
+                lexical_cast<T>( std::string("100") + np.thousands_sep() + np.thousands_sep() + "0" )
+                , bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( std::string("100") + np.thousands_sep() ), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>( np.thousands_sep() + std::string("100") ), bad_lexical_cast);
+
+        // Exception must not be thrown, when we are using no separators at all
+        BOOST_TEST( lexical_cast<T>("30000") == static_cast<T>(30000) );
+    }
+
+
+    test_conversion_from_integral_to_integral<T>();
+
+    // This is a part of test_conversion_from_integral_to_string<T>('0') method,
+    // but with BOOST_TEST_EQ instead of BOOST_TEST. It is required to see
+    // what is produced by the to_str<char>(t) method in situations when result
+    // is different. BOOST_TEST does not work with wchar_t.
+    typedef std::numeric_limits<T> limits;
+    T t = (limits::min)();
+    BOOST_TEST_EQ(lexical_cast<std::string>(t), to_str<char>(t));
+
+    test_conversion_from_integral_to_string<T>('0');
+    test_conversion_from_string_to_integral<T>('0');
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+    if (lexical_cast<std::wstring>(t) != to_str<wchar_t>(t)) {
+        // Something went wrong, and now we are attempting to find and print the
+        // difference.
+        std::wstring wstr = to_str<wchar_t>(t);
+        std::string lcast_str = lexical_cast<std::string>(t);
+        std::string str;
+        str.reserve(wstr.size());
+        for (std::size_t i = 0; i < wstr.size(); ++i) {
+            str.push_back(static_cast<char>(wstr[i]));
+        }
+
+        BOOST_TEST_EQ(lcast_str.length(), lexical_cast<std::wstring>(t).length());
+        BOOST_TEST_EQ(to_str<char>(t), str);
+        BOOST_TEST_EQ(lcast_str, str);
+    }
+
+    test_conversion_from_integral_to_string<T>(L'0');
+    test_conversion_from_string_to_integral<T>(L'0');
+#endif
+}
+
+struct restore_oldloc
+{
+    std::locale oldloc;
+    ~restore_oldloc() { std::locale::global(oldloc); }
+};
+
+template<class T>
+void test_conversion_from_to_integral_minimal()
+{
+    char const zero = '0';
+    signed char const szero = '0';
+    unsigned char const uzero = '0';
+    test_conversion_from_integral_to_char<T>(zero);
+    test_conversion_from_char_to_integral<T>(zero);
+    test_conversion_from_integral_to_char<T>(szero);
+    test_conversion_from_char_to_integral<T>(szero);
+    test_conversion_from_integral_to_char<T>(uzero);
+    test_conversion_from_char_to_integral<T>(uzero);
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    wchar_t const wzero = L'0';
+    test_conversion_from_integral_to_char<T>(wzero);
+    test_conversion_from_char_to_integral<T>(wzero);
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(_LIBCPP_VERSION) && !defined(BOOST_MSVC)
+    char16_t const u16zero = u'0';
+    test_conversion_from_integral_to_char<T>(u16zero);
+    test_conversion_from_char_to_integral<T>(u16zero);
+#endif
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(_LIBCPP_VERSION) && !defined(BOOST_MSVC)
+    char32_t const u32zero = u'0';
+    test_conversion_from_integral_to_char<T>(u32zero);
+    test_conversion_from_char_to_integral<T>(u32zero);
+#endif
+
+    BOOST_TEST(lexical_cast<T>("-1") == static_cast<T>(-1));
+    BOOST_TEST(lexical_cast<T>("-9") == static_cast<T>(-9));
+    BOOST_TEST(lexical_cast<T>(-1) == static_cast<T>(-1));
+    BOOST_TEST(lexical_cast<T>(-9) == static_cast<T>(-9));
+
+    BOOST_TEST_THROWS(lexical_cast<T>("-1.0"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("-9.0"), bad_lexical_cast);
+    BOOST_TEST(lexical_cast<T>(-1.0) == static_cast<T>(-1));
+    BOOST_TEST(lexical_cast<T>(-9.0) == static_cast<T>(-9));
+
+    BOOST_TEST(lexical_cast<T>(static_cast<T>(1)) == static_cast<T>(1));
+    BOOST_TEST(lexical_cast<T>(static_cast<T>(9)) == static_cast<T>(9));
+    BOOST_TEST_THROWS(lexical_cast<T>(1.1f), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>(1.1), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>(1.1L), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>(1.0001f), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>(1.0001), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>(1.0001L), bad_lexical_cast);
+
+    BOOST_TEST(lexical_cast<T>("+1") == static_cast<T>(1) );
+    BOOST_TEST(lexical_cast<T>("+9") == static_cast<T>(9) );
+    BOOST_TEST(lexical_cast<T>("+10") == static_cast<T>(10) );
+    BOOST_TEST(lexical_cast<T>("+90") == static_cast<T>(90) );
+    BOOST_TEST_THROWS(lexical_cast<T>("++1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("-+9"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("--1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<T>("+-9"), bad_lexical_cast);
+    // test_conversion_from_to_integral_for_locale
+
+    // Overflow test case from David W. Birdsall
+    std::string must_owerflow_str =             (sizeof(T) < 16 ?  "160000000000000000000" :  "1600000000000000000000000000000000000000");
+    std::string must_owerflow_negative_str =    (sizeof(T) < 16 ? "-160000000000000000000" : "-1600000000000000000000000000000000000000");
+    for (int i = 0; i < 15; ++i) {
+        BOOST_TEST_THROWS(lexical_cast<T>(must_owerflow_str), bad_lexical_cast);
+        BOOST_TEST_THROWS(lexical_cast<T>(must_owerflow_negative_str), bad_lexical_cast);
+
+        must_owerflow_str += '0';
+        must_owerflow_negative_str += '0';
+    }
+}
+
+template<class T>
+void test_conversion_from_to_integral()
+{
+    test_conversion_from_to_integral_minimal<T>();
+    typedef std::numpunct<char> numpunct;
+
+    restore_oldloc guard;
+    std::locale const& oldloc = guard.oldloc;
+
+    std::string grouping1 = BOOST_USE_FACET(numpunct, oldloc).grouping();
+    std::string grouping2(grouping1);
+
+    test_conversion_from_to_integral_for_locale<T>();
+
+    try
+    {
+        std::locale newloc("");
+        std::locale::global(newloc);
+
+        grouping2 = BOOST_USE_FACET(numpunct, newloc).grouping();
+    }
+    catch(std::exception const& ex)
+    {
+        std::string msg("Failed to set system locale: ");
+        msg += ex.what();
+        std::cerr << msg;
+    }
+
+    if(grouping1 != grouping2)
+        test_conversion_from_to_integral_for_locale<T>();
+
+    if(grouping1.empty() && grouping2.empty())
+        std::cerr << "Formatting with thousands_sep has not been tested";
+}
+
+void test_conversion_from_to_short()
+{
+    test_conversion_from_to_integral<short>();
+}
+
+void test_conversion_from_to_ushort()
+{
+    test_conversion_from_to_integral<unsigned short>();
+}
+
+void test_conversion_from_to_int()
+{
+    test_conversion_from_to_integral<int>();
+}
+
+void test_conversion_from_to_uint()
+{
+    test_conversion_from_to_integral<unsigned int>();
+}
+
+void test_conversion_from_to_long()
+{
+    test_conversion_from_to_integral<long>();
+}
+
+void test_conversion_from_to_ulong()
+{
+    test_conversion_from_to_integral<unsigned long>();
+}
+
+void test_conversion_from_to_intmax_t()
+{
+    test_conversion_from_to_integral<boost::intmax_t>();
+}
+
+void test_conversion_from_to_uintmax_t()
+{
+    test_conversion_from_to_integral<boost::uintmax_t>();
+}
+
+#if defined(BOOST_HAS_LONG_LONG)
+
+void test_conversion_from_to_longlong()
+{
+    test_conversion_from_to_integral<boost::long_long_type>();
+}
+
+void test_conversion_from_to_ulonglong()
+{
+    test_conversion_from_to_integral<boost::ulong_long_type>();
+}
+
+#elif defined(BOOST_HAS_MS_INT64)
+
+void test_conversion_from_to_longlong()
+{
+    test_conversion_from_to_integral<__int64>();
+}
+
+void test_conversion_from_to_ulonglong()
+{
+    test_conversion_from_to_integral<unsigned __int64>();
+}
+
+#endif
+
+
+#ifdef BOOST_LCAST_TEST_128
+
+template <bool Specialized, class T>
+struct test_if_specialized {
+    static void test() {}
+};
+
+template <class T>
+struct test_if_specialized<true, T> {
+    static void test() {
+        test_conversion_from_to_integral_minimal<T>();
+    }
+};
+
+void test_conversion_from_to_int128()
+{
+    test_if_specialized<
+        std::numeric_limits<boost::int128_type>::is_specialized,
+        boost::int128_type
+    >::test();
+}
+
+void test_conversion_from_to_uint128()
+{
+    test_if_specialized<
+        std::numeric_limits<boost::int128_type>::is_specialized,
+        boost::uint128_type
+    >::test();
+}
+#endif
+
+template <typename SignedT>
+void test_integral_conversions_on_min_max_impl()
+{
+    typedef SignedT signed_t;
+    typedef typename boost::detail::lcast::make_unsigned<signed_t>::type unsigned_t;
+
+    typedef std::numeric_limits<signed_t> s_limits;
+    typedef std::numeric_limits<unsigned_t> uns_limits;
+
+    BOOST_TEST_EQ(lexical_cast<unsigned_t>((uns_limits::max)()), (uns_limits::max)());
+    BOOST_TEST_EQ(lexical_cast<unsigned_t>((uns_limits::min)()), (uns_limits::min)());
+
+    BOOST_TEST_EQ(lexical_cast<signed_t>((s_limits::max)()), (s_limits::max)());
+    BOOST_TEST_EQ(lexical_cast<signed_t>((uns_limits::min)()), static_cast<signed_t>((uns_limits::min)()));
+
+    BOOST_TEST_EQ(lexical_cast<unsigned_t>((s_limits::max)()), static_cast<unsigned_t>((s_limits::max)()));
+    BOOST_TEST_EQ(lexical_cast<unsigned_t>((s_limits::min)()), static_cast<unsigned_t>((s_limits::min)()));
+}
+
+void test_integral_conversions_on_min_max()
+{
+    test_integral_conversions_on_min_max_impl<int>();
+    test_integral_conversions_on_min_max_impl<short>();
+
+#ifdef _MSC_VER
+    test_integral_conversions_on_min_max_impl<long int>();
+
+#if defined(BOOST_HAS_LONG_LONG)
+    test_integral_conversions_on_min_max_impl<boost::long_long_type>();
+#elif defined(BOOST_HAS_MS_INT64)
+    test_integral_conversions_on_min_max_impl<__int64>();
+#endif
+
+#ifdef BOOST_LCAST_TEST_128
+    test_integral_conversions_on_min_max_impl<boost::int128_type>();
+#endif
+#endif
+
+}
+
+void test_negative_integral() {
+    // From https://github.com/boostorg/lexical_cast/issues/45
+    BOOST_TEST_EQ(boost::lexical_cast<int>("-6575543"), -6575543);
+
+    BOOST_TEST_EQ(boost::lexical_cast<int>(-6575543), -6575543);
+
+    BOOST_TEST_EQ(boost::lexical_cast<int>("+6575543"), +6575543);
+    BOOST_TEST_EQ(boost::lexical_cast<int>(6575543), 6575543);
+
+    if (sizeof(short) == 2 && CHAR_BIT == 8) {
+        BOOST_TEST_EQ(boost::lexical_cast<short>("-32768"), -32768);
+        BOOST_TEST_EQ(boost::lexical_cast<short>(-32768), -32768);
+        BOOST_TEST_EQ(boost::lexical_cast<unsigned short>("-32768"), 32768);
+        BOOST_TEST_EQ(boost::lexical_cast<unsigned short>(-32768), 32768);
+
+        BOOST_TEST_EQ(boost::lexical_cast<unsigned short>(65535), 65535);
+
+        BOOST_TEST_THROWS(boost::lexical_cast<unsigned short>(-65536), bad_lexical_cast);
+        BOOST_TEST_EQ(boost::lexical_cast<unsigned short>(-65535), 1);
+        BOOST_TEST_EQ(boost::lexical_cast<unsigned short>(-65534), 2);
+
+        BOOST_TEST_THROWS(boost::lexical_cast<short>(65535), bad_lexical_cast);
+        BOOST_TEST_THROWS(boost::lexical_cast<short>(-65536), bad_lexical_cast);
+        BOOST_TEST_THROWS(boost::lexical_cast<short>(-65535), bad_lexical_cast);
+    }
+}
+
+int main()
+{
+    test_conversion_from_to_short();
+    test_conversion_from_to_ushort();
+    test_conversion_from_to_int();
+    test_conversion_from_to_uint();
+    test_conversion_from_to_long();
+    test_conversion_from_to_ulong();
+    test_conversion_from_to_intmax_t();
+    test_conversion_from_to_uintmax_t();
+#ifdef LCAST_TEST_LONGLONG
+    test_conversion_from_to_longlong();
+    test_conversion_from_to_ulonglong();
+#endif
+#ifdef BOOST_LCAST_TEST_128
+    test_conversion_from_to_int128();
+    test_conversion_from_to_uint128();
+#endif
+    test_integral_conversions_on_min_max();
+
+    test_negative_integral();
+
+    return boost::report_errors();
+}
+

test/iterator_range_test.cpp

@@ -0,0 +1,238 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+
+#include <boost/range/iterator_range.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+using namespace boost;
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(_LIBCPP_VERSION) && !defined(BOOST_MSVC)
+#define BOOST_LC_RUNU16
+#endif
+
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(_LIBCPP_VERSION) && !defined(BOOST_MSVC)
+#define BOOST_LC_RUNU32
+#endif
+
+struct class_with_user_defined_sream_operators {
+    int i;
+
+    operator int() const {
+        return i;
+    }
+};
+
+template <class CharT>
+inline std::basic_istream<CharT>& operator >> (std::basic_istream<CharT>& istr, class_with_user_defined_sream_operators& rhs)
+{
+    return istr >> rhs.i;
+}
+
+
+template <class RngT>
+void do_test_iterator_range_impl(const RngT& rng)
+{
+    BOOST_TEST_EQ(lexical_cast<int>(rng), 1);
+    BOOST_TEST_EQ(lexical_cast<int>(rng.begin(), rng.size()), 1);
+    BOOST_TEST_EQ(lexical_cast<unsigned int>(rng), 1u);
+    BOOST_TEST_EQ(lexical_cast<unsigned int>(rng.begin(), rng.size()), 1u);
+    BOOST_TEST_EQ(lexical_cast<short>(rng), 1);
+    BOOST_TEST_EQ(lexical_cast<short>(rng.begin(), rng.size()), 1);
+    BOOST_TEST_EQ(lexical_cast<unsigned short>(rng), 1u);
+    BOOST_TEST_EQ(lexical_cast<unsigned short>(rng.begin(), rng.size()), 1u);
+    BOOST_TEST_EQ(lexical_cast<long int>(rng), 1);
+    BOOST_TEST_EQ(lexical_cast<long int>(rng.begin(), rng.size()), 1);
+    BOOST_TEST_EQ(lexical_cast<unsigned long int>(rng), 1u);
+    BOOST_TEST_EQ(lexical_cast<unsigned long int>(rng.begin(), rng.size()), 1u);
+
+#ifdef BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES
+    BOOST_TEST_EQ(lexical_cast<float>(rng), 1.0f);
+    BOOST_TEST_EQ(lexical_cast<float>(rng.begin(), rng.size()), 1.0f);
+    BOOST_TEST_EQ(lexical_cast<double>(rng), 1.0);
+    BOOST_TEST_EQ(lexical_cast<double>(rng.begin(), rng.size()), 1.0);
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+    BOOST_TEST_EQ(lexical_cast<long double>(rng), 1.0L);
+    BOOST_TEST_EQ(lexical_cast<long double>(rng.begin(), rng.size()), 1.0L);
+#endif
+    BOOST_TEST_EQ(lexical_cast<class_with_user_defined_sream_operators>(rng), 1);
+#endif
+#if defined(BOOST_HAS_LONG_LONG)
+    BOOST_TEST_EQ(lexical_cast<boost::ulong_long_type>(rng), 1u);
+    BOOST_TEST_EQ(lexical_cast<boost::ulong_long_type>(rng.begin(), rng.size()), 1u);
+    BOOST_TEST_EQ(lexical_cast<boost::long_long_type>(rng), 1);
+    BOOST_TEST_EQ(lexical_cast<boost::long_long_type>(rng.begin(), rng.size()), 1);
+#elif defined(BOOST_HAS_MS_INT64)
+    BOOST_TEST_EQ(lexical_cast<unsigned __int64>(rng), 1u);
+    BOOST_TEST_EQ(lexical_cast<unsigned __int64>(rng.begin(), rng.size()), 1u);
+    BOOST_TEST_EQ(lexical_cast<__int64>(rng), 1);
+    BOOST_TEST_EQ(lexical_cast<__int64>(rng.begin(), rng.size()), 1);
+#endif
+}
+
+template <class CharT>
+void test_it_range_using_any_chars(CharT* one, CharT* eleven)
+{
+    typedef CharT test_char_type;
+
+    // Zero terminated
+    iterator_range<test_char_type*> rng1(one, one + 1);
+    do_test_iterator_range_impl(rng1);
+
+    iterator_range<const test_char_type*> crng1(one, one + 1);
+    do_test_iterator_range_impl(crng1);
+
+    // Non zero terminated
+    iterator_range<test_char_type*> rng2(eleven, eleven + 1);
+    do_test_iterator_range_impl(rng2);
+
+    iterator_range<const test_char_type*> crng2(eleven, eleven + 1);
+    do_test_iterator_range_impl(crng2);
+}
+
+template <class CharT>
+void test_it_range_using_char(CharT* one, CharT* eleven)
+{
+    typedef CharT test_char_type;
+
+    iterator_range<test_char_type*> rng1(one, one + 1);
+    BOOST_TEST_EQ(lexical_cast<std::string>(rng1), "1");
+
+    iterator_range<const test_char_type*> crng1(one, one + 1);
+    BOOST_TEST_EQ(lexical_cast<std::string>(crng1), "1");
+
+    iterator_range<test_char_type*> rng2(eleven, eleven + 1);
+    BOOST_TEST_EQ(lexical_cast<std::string>(rng2), "1");
+
+    iterator_range<const test_char_type*> crng2(eleven, eleven + 1);
+    BOOST_TEST_EQ(lexical_cast<std::string>(crng2), "1");
+
+    BOOST_TEST_EQ(lexical_cast<float>(rng1), 1.0f);
+    BOOST_TEST_EQ(lexical_cast<double>(rng1), 1.0);
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+    BOOST_TEST_EQ(lexical_cast<long double>(rng1), 1.0L);
+#endif
+    BOOST_TEST_EQ(lexical_cast<class_with_user_defined_sream_operators>(rng1), 1);
+
+    BOOST_TEST_EQ(lexical_cast<float>(crng2), 1.0f);
+    BOOST_TEST_EQ(lexical_cast<double>(crng2), 1.0);
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+    BOOST_TEST_EQ(lexical_cast<long double>(crng2), 1.0L);
+#endif
+    BOOST_TEST_EQ(lexical_cast<class_with_user_defined_sream_operators>(crng2), 1);
+
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(_LIBCPP_VERSION)
+    BOOST_TEST(lexical_cast<std::wstring>(rng1) == L"1");
+    BOOST_TEST(lexical_cast<std::wstring>(crng1) == L"1");
+    BOOST_TEST(lexical_cast<std::wstring>(rng2) == L"1");
+    BOOST_TEST(lexical_cast<std::wstring>(crng2) == L"1");
+#endif
+
+#if defined(BOOST_LC_RUNU16) && defined(BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES)
+    typedef std::basic_string<char16_t> my_char16_string;
+    BOOST_TEST(lexical_cast<my_char16_string>(rng1) == u"1");
+    BOOST_TEST(lexical_cast<my_char16_string>(crng1) == u"1");
+    BOOST_TEST(lexical_cast<my_char16_string>(rng2) == u"1");
+    BOOST_TEST(lexical_cast<my_char16_string>(crng2) == u"1");
+#endif
+
+#if defined(BOOST_LC_RUNU32) && defined(BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES)
+    typedef std::basic_string<char32_t> my_char32_string;
+    BOOST_TEST(lexical_cast<my_char32_string>(rng1) == U"1");
+    BOOST_TEST(lexical_cast<my_char32_string>(crng1) == U"1");
+    BOOST_TEST(lexical_cast<my_char32_string>(rng2) == U"1");
+    BOOST_TEST(lexical_cast<my_char32_string>(crng2) == U"1");
+#endif
+}
+
+void test_char_iterator_ranges()
+{
+    typedef char test_char_type;
+    test_char_type data1[] = "1";
+    test_char_type data2[] = "11";
+    test_it_range_using_any_chars(data1, data2);
+    test_it_range_using_char(data1, data2);
+}
+
+
+
+void test_unsigned_char_iterator_ranges()
+{
+    typedef unsigned char test_char_type;
+    test_char_type data1[] = "1";
+    test_char_type data2[] = "11";
+    test_it_range_using_any_chars(data1, data2);
+    test_it_range_using_char(data1, data2);
+}
+
+void test_signed_char_iterator_ranges()
+{
+    typedef signed char test_char_type;
+    test_char_type data1[] = "1";
+    test_char_type data2[] = "11";
+    test_it_range_using_any_chars(data1, data2);
+    test_it_range_using_char(data1, data2);
+}
+
+void test_wchar_iterator_ranges()
+{
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(_LIBCPP_VERSION)
+    typedef wchar_t test_char_type;
+    test_char_type data1[] = L"1";
+    test_char_type data2[] = L"11";
+    test_it_range_using_any_chars(data1, data2);
+#endif
+
+    BOOST_TEST(true);
+}
+
+void test_char16_iterator_ranges()
+{
+#if defined(BOOST_LC_RUNU16)
+    typedef char16_t test_char_type;
+    test_char_type data1[] = u"1";
+    test_char_type data2[] = u"11";
+    test_it_range_using_any_chars(data1, data2);
+#endif
+
+    BOOST_TEST(true);
+}
+
+void test_char32_iterator_ranges()
+{
+#if defined(BOOST_LC_RUNU32)
+    typedef char32_t test_char_type;
+    test_char_type data1[] = U"1";
+    test_char_type data2[] = U"11";
+    test_it_range_using_any_chars(data1, data2);
+#endif
+
+    BOOST_TEST(true);
+}
+
+int main()
+{
+    test_char_iterator_ranges();
+    test_unsigned_char_iterator_ranges();
+    test_signed_char_iterator_ranges();
+    test_wchar_iterator_ranges();
+    test_char16_iterator_ranges();
+    test_char32_iterator_ranges();
+
+    return boost::report_errors();
+}

test/lexical_cast_old.hpp

@@ -0,0 +1,177 @@
+// Copyright Kevlin Henney, 2000-2005.
+// Copyright Alexander Nasonov, 2006-2010.
+// Copyright Antony Polukhin, 2011-2026.
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+//
+// what:  lexical_cast custom keyword cast
+// who:   contributed by Kevlin Henney,
+//        enhanced with contributions from Terje Slettebo,
+//        with additional fixes and suggestions from Gennaro Prota,
+//        Beman Dawes, Dave Abrahams, Daryle Walker, Peter Dimov,
+//        Alexander Nasonov, Antony Polukhin, Justin Viiret, Michael Hofmann,
+//        Cheng Yang, Matthew Bradbury, David W. Birdsall, Pavel Korzh and other Boosters
+// when:  November 2000, March 2003, June 2005, June 2006, March 2011 - 2014
+
+#ifndef BOOST_LEXICAL_CAST_LEXICAL_CAST_OLD_HPP
+#define BOOST_LEXICAL_CAST_LEXICAL_CAST_OLD_HPP
+
+#include <boost/config.hpp>
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#   pragma once
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+#include <climits>
+#include <cstddef>
+#include <string>
+#include <cstring>
+#include <cstdio>
+#include <type_traits>
+#include <boost/limits.hpp>
+#include <boost/config/workaround.hpp>
+
+#ifdef BOOST_NO_STRINGSTREAM
+#include <strstream>
+#else
+#include <sstream>
+#endif
+
+#if defined(BOOST_USE_MODULES)
+#undef BOOST_USE_MODULES
+#endif
+#include <boost/lexical_cast/detail/lcast_precision.hpp>
+#include <boost/lexical_cast/bad_lexical_cast.hpp>
+#include <boost/lexical_cast/detail/widest_char.hpp>
+
+namespace boost {
+    namespace detail
+    {
+
+        // selectors for choosing stream character type
+        template<typename Type>
+        struct stream_char
+        {
+            typedef char type;
+        };
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+#ifndef BOOST_NO_INTRINSIC_WCHAR_T
+        template<>
+        struct stream_char<wchar_t>
+        {
+            typedef wchar_t type;
+        };
+#endif
+
+        template<>
+        struct stream_char<wchar_t *>
+        {
+            typedef wchar_t type;
+        };
+
+        template<>
+        struct stream_char<const wchar_t *>
+        {
+            typedef wchar_t type;
+        };
+
+        template<>
+        struct stream_char<std::wstring>
+        {
+            typedef wchar_t type;
+        };
+#endif
+
+        // stream wrapper for handling lexical conversions
+        template<typename Target, typename Source, typename Traits>
+        class lexical_stream
+        {
+        private:
+            typedef typename widest_char<
+                typename stream_char<Target>::type,
+                typename stream_char<Source>::type>::type char_type;
+
+            typedef Traits traits_type;
+
+        public:
+            lexical_stream(char_type* = 0, char_type* = 0)
+            {
+                stream.unsetf(std::ios::skipws);
+                lcast_set_precision(stream, static_cast<Source*>(0), static_cast<Target*>(0) );
+            }
+            ~lexical_stream()
+            {
+                #if defined(BOOST_NO_STRINGSTREAM)
+                stream.freeze(false);
+                #endif
+            }
+            bool operator<<(const Source &input)
+            {
+                return !(stream << input).fail();
+            }
+            template<typename InputStreamable>
+            bool operator>>(InputStreamable &output)
+            {
+                return !std::is_pointer<InputStreamable>::value &&
+                       stream >> output &&
+                       stream.get() == traits_type::eof();
+            }
+
+            bool operator>>(std::string &output)
+            {
+                #if defined(BOOST_NO_STRINGSTREAM)
+                stream << '\0';
+                #endif
+                stream.str().swap(output);
+                return true;
+            }
+            #ifndef BOOST_LCAST_NO_WCHAR_T
+            bool operator>>(std::wstring &output)
+            {
+                stream.str().swap(output);
+                return true;
+            }
+            #endif
+
+        private:
+            #if defined(BOOST_NO_STRINGSTREAM)
+            std::strstream stream;
+            #elif defined(BOOST_NO_STD_LOCALE)
+            std::stringstream stream;
+            #else
+            std::basic_stringstream<char_type,traits_type> stream;
+            #endif
+        };
+    }
+
+    // call-by-value fallback version (deprecated)
+
+    template<typename Target, typename Source>
+    Target lexical_cast(Source arg)
+    {
+        typedef typename detail::widest_char<
+            typename detail::stream_char<Target>::type
+          , typename detail::stream_char<Source>::type
+        >::type char_type;
+
+        typedef std::char_traits<char_type> traits;
+        detail::lexical_stream<Target, Source, traits> interpreter;
+        Target result{};
+
+        if(!(interpreter << arg && interpreter >> result))
+            boost::conversion::detail::throw_bad_cast<Source, Target>();
+        return result;
+    }
+
+} // namespace boost
+
+#undef BOOST_LCAST_NO_WCHAR_T
+
+#endif // BOOST_LEXICAL_CAST_LEXICAL_CAST_OLD_HPP
+

test/lexical_cast_test.cpp

@@ -0,0 +1,601 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Terje Sletteb and Kevlin Henney, 2005.
+//  Copyright Alexander Nasonov, 2006.
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+// Note: The unit test no longer compile on MSVC 6, but lexical_cast itself works for it.
+
+//
+// We need this #define before any #includes: otherwise msvc will emit warnings
+// deep within std::string, resulting from our (perfectly legal) use of basic_string
+// with a custom traits class:
+//
+#define _SCL_SECURE_NO_WARNINGS
+
+#include <boost/cstdint.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/type_traits/integral_promotion.hpp>
+#include <string>
+#include <vector>
+#include <algorithm> // std::transform
+#include <memory>
+
+#include <boost/lexical_cast.hpp>
+
+#if (defined(BOOST_HAS_LONG_LONG) || defined(BOOST_HAS_MS_INT64)) \
+    && !(defined(BOOST_MSVC) && BOOST_MSVC < 1300)
+#define LCAST_TEST_LONGLONG
+#endif
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+#ifndef BOOST_TEST_CLOSE_FRACTION
+// Naiive, but works for tests in this file 
+#define BOOST_TEST_CLOSE_FRACTION(x, y, eps) BOOST_TEST(x - y + eps <= eps * 2)
+#endif
+
+template<class CharT>
+struct my_traits : std::char_traits<CharT>
+{
+};
+
+template<class CharT>
+struct my_allocator : std::allocator<CharT>
+{
+    typedef std::allocator<CharT> base_t;
+
+    my_allocator(){}
+    template <class U> my_allocator(const my_allocator<U>& v) : base_t(v) {}
+
+    template <class U> struct rebind { typedef my_allocator<U> other; };
+};
+
+using namespace boost;
+
+void test_conversion_to_char()
+{
+    BOOST_TEST_EQ('A', lexical_cast<char>('A'));
+    BOOST_TEST_EQ(' ', lexical_cast<char>(' '));
+    BOOST_TEST_EQ('1', lexical_cast<char>(1));
+    BOOST_TEST_EQ('0', lexical_cast<char>(0));
+    BOOST_TEST_THROWS(lexical_cast<char>(123), bad_lexical_cast);
+    BOOST_TEST_EQ('1', lexical_cast<char>(1.0));
+    BOOST_TEST_EQ('1', lexical_cast<char>(true));
+    BOOST_TEST_EQ('0', lexical_cast<char>(false));
+    BOOST_TEST_EQ('A', lexical_cast<char>("A"));
+    BOOST_TEST_EQ(' ', lexical_cast<char>(" "));
+    BOOST_TEST_THROWS(lexical_cast<char>(""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<char>("Test"), bad_lexical_cast);
+    BOOST_TEST_EQ('A', lexical_cast<char>(std::string("A")));
+    BOOST_TEST_EQ(' ', lexical_cast<char>(std::string(" ")));
+    BOOST_TEST_THROWS(
+        lexical_cast<char>(std::string("")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<char>(std::string("Test")), bad_lexical_cast);
+}
+
+void test_conversion_to_int()
+{
+    BOOST_TEST_EQ(1, lexical_cast<int>('1'));
+    BOOST_TEST_EQ(0, lexical_cast<int>('0'));
+    BOOST_TEST_THROWS(lexical_cast<int>('A'), bad_lexical_cast);
+    BOOST_TEST_EQ(1, lexical_cast<int>(1));
+    BOOST_TEST_EQ(1, lexical_cast<int>(1.0));
+
+    BOOST_TEST_EQ(
+        (std::numeric_limits<int>::max)(),
+        lexical_cast<int>((std::numeric_limits<int>::max)()));
+
+    BOOST_TEST_EQ(
+        (std::numeric_limits<int>::min)(),
+        lexical_cast<int>((std::numeric_limits<int>::min)()));
+
+    BOOST_TEST_THROWS(lexical_cast<int>(1.23), bad_lexical_cast);
+
+    BOOST_TEST_THROWS(lexical_cast<int>(1e20), bad_lexical_cast);
+    BOOST_TEST_EQ(1, lexical_cast<int>(true));
+    BOOST_TEST_EQ(0, lexical_cast<int>(false));
+    BOOST_TEST_EQ(123, lexical_cast<int>("123"));
+    BOOST_TEST_THROWS(
+        lexical_cast<int>(" 123"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<int>(""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<int>("Test"), bad_lexical_cast);
+    BOOST_TEST_EQ(123, lexical_cast<int>("123"));
+    BOOST_TEST_EQ(123, lexical_cast<int>(std::string("123")));
+    BOOST_TEST_THROWS(
+        lexical_cast<int>(std::string(" 123")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<int>(std::string("")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<int>(std::string("Test")), bad_lexical_cast);
+}
+
+void test_conversion_with_nonconst_char()
+{
+    std::vector<char> buffer;
+    buffer.push_back('1');
+    buffer.push_back('\0');
+    BOOST_TEST_EQ(boost::lexical_cast<int>(&buffer[0]), 1);
+
+    std::vector<unsigned char> buffer2;
+    buffer2.push_back('1');
+    buffer2.push_back('\0');
+    BOOST_TEST_EQ(boost::lexical_cast<int>(&buffer2[0]), 1);
+
+    std::vector<unsigned char> buffer3;
+    buffer3.push_back('1');
+    buffer3.push_back('\0');
+    BOOST_TEST_EQ(boost::lexical_cast<int>(&buffer3[0]), 1);
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    std::vector<wchar_t> buffer4;
+    buffer4.push_back(L'1');
+    buffer4.push_back(L'\0');
+    BOOST_TEST_EQ(boost::lexical_cast<int>(&buffer4[0]), 1);
+#endif
+}
+
+void test_conversion_to_double()
+{
+    BOOST_TEST_CLOSE_FRACTION(1.0, lexical_cast<double>('1'), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_THROWS(lexical_cast<double>('A'), bad_lexical_cast);
+    BOOST_TEST_CLOSE_FRACTION(1.0, lexical_cast<double>(1), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_CLOSE_FRACTION(1.23, lexical_cast<double>(1.23), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_CLOSE_FRACTION(1.234567890, lexical_cast<double>(1.234567890), std::numeric_limits<double>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(1.234567890, lexical_cast<double>("1.234567890"), std::numeric_limits<double>::epsilon());
+    BOOST_TEST_CLOSE_FRACTION(1.0, lexical_cast<double>(true), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_CLOSE_FRACTION(0.0, lexical_cast<double>(false), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_CLOSE_FRACTION(1.23, lexical_cast<double>("1.23"), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_THROWS(lexical_cast<double>(""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<double>("Test"), bad_lexical_cast);
+    BOOST_TEST_CLOSE_FRACTION(1.23, lexical_cast<double>(std::string("1.23")), (std::numeric_limits<double>::epsilon()));
+    BOOST_TEST_THROWS(
+        lexical_cast<double>(std::string("")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<double>(std::string("Test")), bad_lexical_cast);
+}
+
+void test_conversion_to_bool()
+{
+    BOOST_TEST_EQ(true, lexical_cast<bool>('1'));
+    BOOST_TEST_EQ(false, lexical_cast<bool>('0'));
+    BOOST_TEST_THROWS(lexical_cast<bool>('A'), bad_lexical_cast);
+    BOOST_TEST_EQ(true, lexical_cast<bool>(1));
+    BOOST_TEST_EQ(false, lexical_cast<bool>(0));
+    BOOST_TEST_THROWS(lexical_cast<bool>(123), bad_lexical_cast);
+    BOOST_TEST_EQ(true, lexical_cast<bool>(1.0));
+    BOOST_TEST_THROWS(lexical_cast<bool>(-123), bad_lexical_cast);
+    BOOST_TEST_EQ(false, lexical_cast<bool>(0.0));
+    BOOST_TEST_THROWS(lexical_cast<bool>(1234), bad_lexical_cast);
+#if !defined(_CRAYC)
+    // Looks like a bug in CRAY compiler (throws bad_lexical_cast)
+    // TODO: localize the bug and report it to developers.
+    BOOST_TEST_EQ(true, lexical_cast<bool>(true));
+    BOOST_TEST_EQ(false, lexical_cast<bool>(false));
+#endif
+    BOOST_TEST_EQ(true, lexical_cast<bool>("1"));
+    BOOST_TEST_EQ(false, lexical_cast<bool>("0"));
+    BOOST_TEST_THROWS(lexical_cast<bool>(""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("Test"), bad_lexical_cast);
+    BOOST_TEST_EQ(true, lexical_cast<bool>("1"));
+    BOOST_TEST_EQ(false, lexical_cast<bool>("0"));
+    BOOST_TEST_EQ(true, lexical_cast<bool>(std::string("1")));
+    BOOST_TEST_EQ(false, lexical_cast<bool>(std::string("0")));
+
+    BOOST_TEST_THROWS(lexical_cast<bool>(1.0001L), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>(2), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>(2u), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>(-1), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>(-2), bad_lexical_cast);
+
+
+    BOOST_TEST_THROWS(
+        lexical_cast<bool>(std::string("")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<bool>(std::string("Test")), bad_lexical_cast);
+
+    BOOST_TEST(lexical_cast<bool>("+1") == true);
+    BOOST_TEST(lexical_cast<bool>("+0") == false);
+    BOOST_TEST(lexical_cast<bool>("-0") == false);
+    BOOST_TEST_THROWS(lexical_cast<bool>("--0"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("-+-0"), bad_lexical_cast);
+
+    BOOST_TEST(lexical_cast<bool>("0") == false);
+    BOOST_TEST(lexical_cast<bool>("1") == true);
+    BOOST_TEST(lexical_cast<bool>("00") == false);
+    BOOST_TEST(lexical_cast<bool>("00000000000") == false);
+    BOOST_TEST(lexical_cast<bool>("000000000001") == true);
+    BOOST_TEST(lexical_cast<bool>("+00") == false );
+    BOOST_TEST(lexical_cast<bool>("-00") == false );
+    BOOST_TEST(lexical_cast<bool>("+00000000001") == true );
+
+    BOOST_TEST_THROWS(lexical_cast<bool>("020"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("00200"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("-00200"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("+00200"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("000000000002"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("-1"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("-0000000001"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("00000000011"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("001001"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("-00000000010"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>("-000000000100"), bad_lexical_cast);
+}
+
+void test_conversion_to_string()
+{
+    char buf[] = "hello";
+    char* str = buf;
+    BOOST_TEST_EQ(str, lexical_cast<std::string>(str));
+    BOOST_TEST_EQ("A", lexical_cast<std::string>('A'));
+    BOOST_TEST_EQ(" ", lexical_cast<std::string>(' '));
+    BOOST_TEST_EQ("123", lexical_cast<std::string>(123));
+    BOOST_TEST_EQ("1.23", lexical_cast<std::string>(1.23));
+    BOOST_TEST_EQ("1.111111111", lexical_cast<std::string>(1.111111111));
+    BOOST_TEST_EQ("1", lexical_cast<std::string>(true));
+    BOOST_TEST_EQ("0", lexical_cast<std::string>(false));
+    BOOST_TEST_EQ("Test", lexical_cast<std::string>("Test"));
+    BOOST_TEST_EQ(" ", lexical_cast<std::string>(" "));
+    BOOST_TEST_EQ("", lexical_cast<std::string>(""));
+    BOOST_TEST_EQ("Test", lexical_cast<std::string>(std::string("Test")));
+    BOOST_TEST_EQ(" ", lexical_cast<std::string>(std::string(" ")));
+    BOOST_TEST_EQ("", lexical_cast<std::string>(std::string("")));
+}
+
+void test_conversion_from_to_wchar_t_alias()
+{
+    BOOST_TEST_EQ(123u, lexical_cast<unsigned short>("123"));
+    BOOST_TEST_EQ(123u, lexical_cast<unsigned int>("123"));
+    BOOST_TEST_EQ(123u, lexical_cast<unsigned long>("123"));
+    BOOST_TEST_EQ(std::string("123"),
+        lexical_cast<std::string>(static_cast<unsigned short>(123)));
+    BOOST_TEST_EQ(std::string("123"), lexical_cast<std::string>(123u));
+    BOOST_TEST_EQ(std::string("123"), lexical_cast<std::string>(123ul));
+}
+
+void test_conversion_from_wchar_t()
+{
+#ifndef BOOST_LCAST_NO_WCHAR_T
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    BOOST_TEST_EQ(1, lexical_cast<int>(L'1'));
+    BOOST_TEST_THROWS(lexical_cast<int>(L'A'), bad_lexical_cast);
+#endif
+
+    BOOST_TEST_EQ(123, lexical_cast<int>(L"123"));
+    BOOST_TEST_THROWS(lexical_cast<int>(L""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<int>(L"Test"), bad_lexical_cast);
+
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    BOOST_TEST_EQ(1.0, lexical_cast<double>(L'1'));
+    BOOST_TEST_THROWS(lexical_cast<double>(L'A'), bad_lexical_cast);
+#endif
+
+    BOOST_TEST_EQ(1.23, lexical_cast<double>(L"1.23"));
+    BOOST_TEST_THROWS(lexical_cast<double>(L""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<double>(L"Test"), bad_lexical_cast);
+
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    BOOST_TEST_EQ(true, lexical_cast<bool>(L'1'));
+    BOOST_TEST_EQ(false, lexical_cast<bool>(L'0'));
+    BOOST_TEST_THROWS(lexical_cast<bool>(L'A'), bad_lexical_cast);
+#endif
+    BOOST_TEST_EQ(true, lexical_cast<bool>(L"1"));
+    BOOST_TEST_EQ(false, lexical_cast<bool>(L"0"));
+    BOOST_TEST_THROWS(lexical_cast<bool>(L""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<bool>(L"Test"), bad_lexical_cast);
+#endif
+}
+
+void test_conversion_to_wchar_t()
+{
+#if !defined(BOOST_LCAST_NO_WCHAR_T) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    BOOST_TEST(L'1' == lexical_cast<wchar_t>(1));
+    BOOST_TEST(L'0' == lexical_cast<wchar_t>(0));
+    BOOST_TEST(L'1' == lexical_cast<wchar_t>('1'));
+    BOOST_TEST(L'0' == lexical_cast<wchar_t>('0'));
+    BOOST_TEST_THROWS(lexical_cast<wchar_t>(123), bad_lexical_cast);
+    BOOST_TEST(L'1' == lexical_cast<wchar_t>(1.0));
+    BOOST_TEST(L'0' == lexical_cast<wchar_t>(0.0));
+    BOOST_TEST(L'1' == lexical_cast<wchar_t>(true));
+    BOOST_TEST(L'0' == lexical_cast<wchar_t>(false));
+    BOOST_TEST(L'A' == lexical_cast<wchar_t>(L'A'));
+    BOOST_TEST(L' ' == lexical_cast<wchar_t>(L' '));
+    BOOST_TEST(L'A' == lexical_cast<wchar_t>(L"A"));
+    BOOST_TEST(L' ' == lexical_cast<wchar_t>(L" "));
+    BOOST_TEST_THROWS(lexical_cast<wchar_t>(L""), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<wchar_t>(L"Test"), bad_lexical_cast);
+    BOOST_TEST(L'A' == lexical_cast<wchar_t>(std::wstring(L"A")));
+    BOOST_TEST(L' ' == lexical_cast<wchar_t>(std::wstring(L" ")));
+    BOOST_TEST_THROWS(
+        lexical_cast<wchar_t>(std::wstring(L"")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<wchar_t>(std::wstring(L"Test")), bad_lexical_cast);
+#endif
+    BOOST_TEST(true);
+}
+
+void test_conversion_from_wstring()
+{
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    BOOST_TEST_EQ(123, lexical_cast<int>(std::wstring(L"123")));
+    BOOST_TEST_THROWS(
+        lexical_cast<int>(std::wstring(L"")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<int>(std::wstring(L"Test")), bad_lexical_cast);
+
+    BOOST_TEST_EQ(true, lexical_cast<bool>(std::wstring(L"1")));
+    BOOST_TEST_EQ(false, lexical_cast<bool>(std::wstring(L"0")));
+    BOOST_TEST_THROWS(
+        lexical_cast<bool>(std::wstring(L"")), bad_lexical_cast);
+    BOOST_TEST_THROWS(
+        lexical_cast<bool>(std::wstring(L"Test")), bad_lexical_cast);
+#endif
+    BOOST_TEST(true);
+}
+
+void test_conversion_to_wstring()
+{
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    wchar_t buf[] = L"hello";
+    wchar_t* str = buf;
+    BOOST_TEST(str == lexical_cast<std::wstring>(str));
+    BOOST_TEST(L"123" == lexical_cast<std::wstring>(123));
+    BOOST_TEST(L"1.23" == lexical_cast<std::wstring>(1.23));
+    BOOST_TEST(L"1" == lexical_cast<std::wstring>(true));
+    BOOST_TEST(L"0" == lexical_cast<std::wstring>(false));
+#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
+    BOOST_TEST(L"A" == lexical_cast<std::wstring>(L'A'));
+    BOOST_TEST(L" " == lexical_cast<std::wstring>(L' '));
+    BOOST_TEST(L"A" == lexical_cast<std::wstring>('A'));
+#endif
+    BOOST_TEST(L"Test" == lexical_cast<std::wstring>(L"Test"));
+    BOOST_TEST(L" " == lexical_cast<std::wstring>(L" "));
+    BOOST_TEST(L"" == lexical_cast<std::wstring>(L""));
+    BOOST_TEST(L"Test" == lexical_cast<std::wstring>(std::wstring(L"Test")));
+    BOOST_TEST(L" " == lexical_cast<std::wstring>(std::wstring(L" ")));
+    BOOST_TEST(L"" == lexical_cast<std::wstring>(std::wstring(L"")));
+#endif
+    BOOST_TEST(true);
+}
+
+void test_bad_lexical_cast()
+{
+    try
+    {
+        lexical_cast<int>(std::string("Test"));
+
+        BOOST_TEST(false); // Exception expected
+    }
+    catch(const bad_lexical_cast &e)
+    {
+        BOOST_TEST(e.source_type() == typeid(std::string));
+        BOOST_TEST(e.target_type() == typeid(int));
+    }
+}
+
+void test_no_whitespace_stripping()
+{
+    BOOST_TEST_THROWS(lexical_cast<int>(" 123"), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<int>("123 "), bad_lexical_cast);
+}
+
+void test_traits()
+{
+    typedef std::basic_string<char, my_traits<char> > my_string;
+
+    my_string const s("s");
+    BOOST_TEST(boost::lexical_cast<char>(s) == s[0]);
+    BOOST_TEST(boost::lexical_cast<my_string>(s) == s);
+    BOOST_TEST(boost::lexical_cast<my_string>(-1) == "-1");
+    BOOST_TEST(boost::lexical_cast<int>(my_string("42")) == 42);
+    BOOST_TEST(boost::lexical_cast<double>(my_string("1.0")) == 1.0);
+}
+
+void test_wtraits()
+{
+    typedef std::basic_string<wchar_t, my_traits<wchar_t> > my_string;
+
+    my_string const s(L"s");
+    BOOST_TEST(boost::lexical_cast<wchar_t>(s) == s[0]);
+    BOOST_TEST(boost::lexical_cast<my_string>(s) == s);
+    BOOST_TEST(boost::lexical_cast<my_string>(-1) == L"-1");
+    BOOST_TEST(boost::lexical_cast<int>(my_string(L"42")) == 42);
+    BOOST_TEST(boost::lexical_cast<double>(my_string(L"1.0")) == 1.0);
+}
+
+void test_allocator()
+{
+// Following test cause compilation error on MSVC2012:
+// (Reason: cannot convert from 'std::_Wrap_alloc<_Alloc>' to 'const my_allocator<CharT>')
+//
+// MSVC developer is notified about this issue
+#if !defined(_MSC_VER) || (_MSC_VER < 1700)
+    typedef std::basic_string< char
+                             , std::char_traits<char>
+                             , my_allocator<char>
+                             > my_string;
+
+    my_string s("s");
+    BOOST_TEST(boost::lexical_cast<char>(s) == s[0]);
+    BOOST_TEST(boost::lexical_cast<std::string>(s) == "s");
+    BOOST_TEST(boost::lexical_cast<my_string>(s) == s);
+    BOOST_TEST(boost::lexical_cast<my_string>(1) == "1");
+    BOOST_TEST(boost::lexical_cast<my_string>("s") == s);
+    BOOST_TEST(boost::lexical_cast<my_string>(std::string("s")) == s);
+#endif
+}
+
+void test_wallocator()
+{
+// Following test cause compilation error on MSVC2012:
+// (Reason: cannot convert from 'std::_Wrap_alloc<_Alloc>' to 'const my_allocator<CharT>')
+//
+// MSVC developer is notified about this issue
+#if !defined(_MSC_VER) || (_MSC_VER < 1700)
+    typedef std::basic_string< wchar_t
+                             , std::char_traits<wchar_t>
+                             , my_allocator<wchar_t>
+                             > my_string;
+
+    my_string s(L"s");
+    BOOST_TEST(boost::lexical_cast<wchar_t>(s) == s[0]);
+    BOOST_TEST(boost::lexical_cast<std::wstring>(s) == L"s");
+    BOOST_TEST(boost::lexical_cast<my_string>(s) == s);
+    BOOST_TEST(boost::lexical_cast<my_string>(1) == L"1");
+    BOOST_TEST(boost::lexical_cast<my_string>(L"s") == s);
+    BOOST_TEST(boost::lexical_cast<my_string>(std::wstring(L"s")) == s);
+#endif
+}
+
+
+void test_char_types_conversions()
+{
+    const char c_arr[]            = "Test array of chars";
+    const unsigned char uc_arr[]  = "Test array of chars";
+    const signed char sc_arr[]    = "Test array of chars";
+
+    BOOST_TEST(boost::lexical_cast<std::string>(c_arr) == std::string(c_arr));
+    BOOST_TEST(boost::lexical_cast<std::string>(uc_arr) == std::string(c_arr));
+    BOOST_TEST(boost::lexical_cast<std::string>(sc_arr) == std::string(c_arr));
+
+    BOOST_TEST(boost::lexical_cast<char>(c_arr[0]) == c_arr[0]);
+    BOOST_TEST(boost::lexical_cast<char>(uc_arr[0]) == c_arr[0]);
+    BOOST_TEST(boost::lexical_cast<char>(sc_arr[0]) == c_arr[0]);
+
+    BOOST_TEST(boost::lexical_cast<unsigned char>(c_arr[0]) == uc_arr[0]);
+    BOOST_TEST(boost::lexical_cast<unsigned char>(uc_arr[0]) == uc_arr[0]);
+    BOOST_TEST(boost::lexical_cast<unsigned char>(sc_arr[0]) == uc_arr[0]);
+
+    BOOST_TEST(boost::lexical_cast<signed char>(c_arr[0]) == sc_arr[0]);
+    BOOST_TEST(boost::lexical_cast<signed char>(uc_arr[0]) == sc_arr[0]);
+    BOOST_TEST(boost::lexical_cast<signed char>(sc_arr[0]) == sc_arr[0]);
+
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    const wchar_t wc_arr[]=L"Test array of chars";
+
+    BOOST_TEST(boost::lexical_cast<std::wstring>(wc_arr) == std::wstring(wc_arr));
+    BOOST_TEST(boost::lexical_cast<wchar_t>(wc_arr[0]) == wc_arr[0]);
+
+#endif
+}
+
+
+
+struct foo_operators_test
+{
+  foo_operators_test() : f(2) {}
+  int f;
+};
+
+template <typename OStream>
+OStream& operator<<(OStream& ostr, const foo_operators_test& foo)
+{
+  ostr << foo.f;
+  return ostr;
+}
+
+template <typename IStream>
+IStream& operator>>(IStream& istr, foo_operators_test& foo)
+{
+  istr >> foo.f;
+  return istr;
+}
+
+void operators_overload_test()
+{
+    foo_operators_test foo;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(foo), "2");
+    BOOST_TEST_EQ((boost::lexical_cast<foo_operators_test>("2")).f, 2);
+
+    // Must compile
+    (void)boost::lexical_cast<foo_operators_test>(foo);
+}
+
+
+void test_char16_conversions()
+{
+// There's no std::ctype<char16_t> in Xcode_15.0.1
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(__APPLE__)
+    BOOST_TEST(u"100" == lexical_cast<std::u16string>(u"100"));
+#if !defined(_LIBCPP_VERSION) // libc++ also does not have std::ctype<char16_t>
+    BOOST_TEST(u"1" == lexical_cast<std::u16string>(u'1'));
+#endif
+#endif
+}
+
+void test_char32_conversions()
+{
+// There's no std::ctype<char32_t> in Xcode_15.0.1
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && !defined(__APPLE__)
+    BOOST_TEST(U"100" == lexical_cast<std::u32string>(U"100"));
+#if !defined(_LIBCPP_VERSION) // libc++ also does not have std::ctype<char32_t>
+    BOOST_TEST(U"1" == lexical_cast<std::u32string>(U'1'));
+#endif
+#endif
+}
+
+void test_getting_pointer_to_function()
+{
+    // Just checking that &lexical_cast<To, From> is not ambiguous
+    typedef char char_arr[4];
+    typedef int(*f1)(const char_arr&);
+    f1 p1 = &boost::lexical_cast<int, char_arr>;
+    BOOST_TEST(p1);
+
+    typedef int(*f2)(const std::string&);
+    f2 p2 = &boost::lexical_cast<int, std::string>;
+    BOOST_TEST(p2);
+
+    typedef std::string(*f3)(const int&);
+    f3 p3 = &boost::lexical_cast<std::string, int>;
+    BOOST_TEST(p3);
+
+    std::vector<int> values;
+    std::vector<std::string> ret;
+    std::transform(values.begin(), values.end(), ret.begin(), boost::lexical_cast<std::string, int>);
+}
+
+int main()
+{
+    test_conversion_to_char();
+    test_conversion_to_int();
+    test_conversion_to_double();
+    test_conversion_to_bool();
+    test_conversion_from_to_wchar_t_alias();
+    test_conversion_to_string();
+    test_conversion_with_nonconst_char();
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    test_conversion_from_wchar_t();
+    test_conversion_to_wchar_t();
+    test_conversion_from_wstring();
+    test_conversion_to_wstring();
+#endif
+    test_bad_lexical_cast();
+    test_no_whitespace_stripping();
+
+    test_traits();
+    test_wtraits();
+    test_allocator();
+    test_wallocator();
+
+    test_char_types_conversions();
+    operators_overload_test();
+    test_char16_conversions();
+    test_char32_conversions();
+    test_getting_pointer_to_function();
+
+    return boost::report_errors();
+}
+
+

test/loopback_test.cpp

@@ -3,6 +3,7 @@
 //  See http://www.boost.org for most recent version, including documentation.
 //
 //  Copyright Alexander Nasonov, 2006.
+//  Copyright Antony Polukhin, 2023-2026.
 //
 //  Distributed under the Boost
 //  Software License, Version 1.0. (See accompanying file
@@ -11,69 +12,49 @@
 //  Test round-tripping conversion FPT -> string -> FPT,
 //  where FPT is Floating Point Type.
 
-#include <boost/config.hpp>
-
-#if defined(__INTEL_COMPILER)
-#pragma warning(disable: 193 383 488 981 1418 1419)
-#elif defined(BOOST_MSVC)
-#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
-#endif
+#include <boost/core/lightweight_test.hpp>
 
 #include <boost/lexical_cast.hpp>
-#include <boost/test/unit_test.hpp>
 
-using namespace boost;
-
-void test_round_conversion_float();
-void test_round_conversion_double();
-void test_round_conversion_long_double();
-
-unit_test::test_suite *init_unit_test_suite(int, char *[])
-{
-    unit_test_framework::test_suite *suite =
-        BOOST_TEST_SUITE("lexical_cast unit test");
-    suite->add(BOOST_TEST_CASE(&test_round_conversion_float));
-    suite->add(BOOST_TEST_CASE(&test_round_conversion_double));
-    suite->add(BOOST_TEST_CASE(&test_round_conversion_long_double));
-
-    return suite;
-}
+#if (defined(__CYGWIN__) || defined(__FreeBSD__) || defined(__NetBSD__) \
+   || (defined(__hppa) && !defined(__OpenBSD__)) || (defined(__NO_LONG_DOUBLE_MATH) && (DBL_MANT_DIG != LDBL_MANT_DIG))) \
+   || defined(__MINGW64__)
+#  define BOOST_LEXICAL_CAST_NO_LONG_DOUBLE_MATH_FUNCTIONS
+#endif
 
 template<class T>
 void test_round_conversion()
 {
     T epsilon = std::numeric_limits<T>::epsilon();
     std::string const epsilon_s = boost::lexical_cast<std::string>(epsilon);
-    BOOST_CHECK(epsilon == lexical_cast<T>(epsilon_s));
+    BOOST_TEST(epsilon == boost::lexical_cast<T>(epsilon_s));
 
     T max_ = (std::numeric_limits<T>::max)();
     std::string const max_s = boost::lexical_cast<std::string>(max_);
-    BOOST_CHECK(max_ == lexical_cast<T>(max_s));
+    BOOST_TEST(max_ == boost::lexical_cast<T>(max_s));
 
     T min_ = (std::numeric_limits<T>::min)();
     std::string const min_s = boost::lexical_cast<std::string>(min_);
-    BOOST_CHECK(min_ == lexical_cast<T>(min_s));
+    BOOST_TEST(min_ == boost::lexical_cast<T>(min_s));
 
     T max_div137 = max_ / 137;
     std::string max_div137_s = boost::lexical_cast<std::string>(max_div137);
-    BOOST_CHECK(max_div137 == lexical_cast<T>(max_div137_s));
+    BOOST_TEST(max_div137 == boost::lexical_cast<T>(max_div137_s));
 
     T epsilon_mult137 = epsilon * 137;
-    std::string epsilon_mult137_s(lexical_cast<std::string>(epsilon_mult137));
-    BOOST_CHECK(epsilon_mult137 == lexical_cast<T>(epsilon_mult137_s));
+    std::string epsilon_mult137_s(boost::lexical_cast<std::string>(epsilon_mult137));
+    BOOST_TEST(epsilon_mult137 == boost::lexical_cast<T>(epsilon_mult137_s));
 
 }
 
-#if defined(BOOST_MSVC)
 // See bug http://tinyurl.com/vhpvo
 template<class T>
 void test_msvc_magic_values()
 {
     T magic_msvc = 0.00010000433948393407;
     std::string magic_msvc_s = boost::lexical_cast<std::string>(magic_msvc);
-    BOOST_CHECK(magic_msvc == lexical_cast<T>(magic_msvc_s));
+    BOOST_TEST(magic_msvc == boost::lexical_cast<T>(magic_msvc_s));
 }
-#endif
 
 void test_round_conversion_float()
 {
@@ -83,16 +64,25 @@ void test_round_conversion_float()
 void test_round_conversion_double()
 {
     test_round_conversion<double>();
-#if defined(BOOST_MSVC)
     test_msvc_magic_values<double>();
-#endif
 }
 
 void test_round_conversion_long_double()
 {
+// We do not run tests on compilers and Standard Libraries with poor support of long double
+#if !defined(BOOST_LEXICAL_CAST_NO_LONG_DOUBLE_MATH_FUNCTIONS)
     test_round_conversion<long double>();
-#if defined(BOOST_MSVC)
     test_msvc_magic_values<long double>();
 #endif
+    BOOST_TEST(true);
+}
+
+int main()
+{
+    test_round_conversion_float();
+    test_round_conversion_double();
+    test_round_conversion_long_double();
+
+    return boost::report_errors();
 }
 

test/no_exceptions_test.cpp

@@ -0,0 +1,78 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/config.hpp>
+
+#if defined(__INTEL_COMPILER)
+#pragma warning(disable: 193 383 488 981 1418 1419)
+#elif defined(BOOST_MSVC)
+#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
+#endif
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/range/iterator_range.hpp>
+
+#include <cstdlib>
+
+#if defined(BOOST_USE_MODULES)
+#undef BOOST_USE_MODULES
+#endif
+#include <boost/lexical_cast.hpp>
+
+#include "escape_struct.hpp"
+
+#ifndef BOOST_NO_EXCEPTIONS
+#error "This test must be compiled with -DBOOST_NO_EXCEPTIONS"
+#endif
+
+namespace boost {
+
+BOOST_NORETURN void throw_exception(std::exception const & ) {
+    static int state = 0;
+    ++ state;
+
+    EscapeStruct v("");
+    switch(state) {
+    case 1:
+        lexical_cast<char>(v); // should call boost::throw_exception
+        std::exit(1);
+    case 2:
+        lexical_cast<unsigned char>(v); // should call boost::throw_exception
+        std::exit(2);
+    }
+    std::exit(boost::report_errors());
+}
+
+}
+
+void test_exceptions_off() {
+    using namespace boost;
+    EscapeStruct v("");
+
+    v = lexical_cast<EscapeStruct>(100);
+    BOOST_TEST_EQ(lexical_cast<int>(v), 100);
+    BOOST_TEST_EQ(lexical_cast<unsigned int>(v), 100u);
+
+    v = lexical_cast<EscapeStruct>(0.0);
+    BOOST_TEST_EQ(lexical_cast<double>(v), 0.0);
+
+    BOOST_TEST_EQ(lexical_cast<short>(100), 100);
+    BOOST_TEST_EQ(lexical_cast<float>(0.0), 0.0);
+
+    lexical_cast<short>(700000); // should call boost::throw_exception
+    BOOST_TEST(false);
+}
+
+int main() {
+    test_exceptions_off();
+
+    return boost::report_errors();
+}
+

test/no_locale_test.cpp

@@ -0,0 +1,143 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+#include <boost/range/iterator_range.hpp>
+
+#include "escape_struct.hpp"
+
+#include <vector>
+
+#include <boost/lexical_cast.hpp>
+
+using namespace boost;
+
+// Testing compilation and some basic usage with BOOST_NO_STD_LOCALE
+// Tests are mainly copyied from empty_input_test.cpp (something
+// new added to test_empty_3)
+
+#ifndef BOOST_NO_STD_LOCALE
+#error "This test must be compiled with -DBOOST_NO_STD_LOCALE"
+#endif
+
+
+template <class T>
+void do_test_on_empty_input(T& v)
+{
+    BOOST_TEST_THROWS(lexical_cast<int>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<float>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<double>(v), bad_lexical_cast);
+#ifndef BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+    BOOST_TEST_THROWS(lexical_cast<long double>(v), bad_lexical_cast);
+#endif
+    BOOST_TEST_THROWS(lexical_cast<unsigned int>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned short>(v), bad_lexical_cast);
+#if defined(BOOST_HAS_LONG_LONG)
+    BOOST_TEST_THROWS(lexical_cast<boost::ulong_long_type>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<boost::long_long_type>(v), bad_lexical_cast);
+#elif defined(BOOST_HAS_MS_INT64)
+    BOOST_TEST_THROWS(lexical_cast<unsigned __int64>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<__int64>(v), bad_lexical_cast);
+#endif
+}
+
+void test_empty_1()
+{
+    boost::iterator_range<char*> v;
+    do_test_on_empty_input(v);
+    BOOST_TEST_EQ(lexical_cast<std::string>(v), std::string());
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+
+    boost::iterator_range<const char*> cv;
+    do_test_on_empty_input(cv);
+    BOOST_TEST_EQ(lexical_cast<std::string>(cv), std::string());
+    BOOST_TEST_THROWS(lexical_cast<char>(cv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(cv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(cv), bad_lexical_cast);
+
+    const boost::iterator_range<const char*> ccv;
+    do_test_on_empty_input(ccv);
+    BOOST_TEST_EQ(lexical_cast<std::string>(ccv), std::string());
+    BOOST_TEST_THROWS(lexical_cast<char>(ccv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(ccv), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(ccv), bad_lexical_cast);
+}
+
+void test_empty_2()
+{
+    std::string v;
+    do_test_on_empty_input(v);
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+}
+
+void test_empty_3()
+{
+    EscapeStruct v("");
+    do_test_on_empty_input(v);
+
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+
+    v = lexical_cast<EscapeStruct>(100);
+    BOOST_TEST_EQ(lexical_cast<int>(v), 100);
+    BOOST_TEST_EQ(lexical_cast<unsigned int>(v), 100u);
+
+    v = lexical_cast<EscapeStruct>(0.0);
+    BOOST_TEST_EQ(lexical_cast<double>(v), 0.0);
+}
+
+namespace std {
+inline std::ostream & operator<<(std::ostream & out, const std::vector<long> & v)
+{
+    std::ostream_iterator<long> it(out);
+    std::copy(v.begin(), v.end(), it);
+    BOOST_TEST(out);
+    return out;
+}
+}
+
+void test_empty_4()
+{
+    std::vector<long> v;
+    do_test_on_empty_input(v);
+    BOOST_TEST_THROWS(lexical_cast<char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<unsigned char>(v), bad_lexical_cast);
+    BOOST_TEST_THROWS(lexical_cast<signed char>(v), bad_lexical_cast);
+}
+
+
+struct my_string {
+    friend std::ostream &operator<<(std::ostream& sout, my_string const&/* st*/) {
+            return sout << "";
+    }
+};
+
+void test_empty_5()
+{
+    my_string st;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(st), std::string());;
+}
+
+int main()
+{
+    test_empty_1();
+    test_empty_2();
+    test_empty_3();
+    test_empty_4();
+    test_empty_5();
+
+    return boost::report_errors();
+}
+

test/noncopyable_test.cpp

@@ -3,6 +3,7 @@
 //  See http://www.boost.org for most recent version, including documentation.
 //
 //  Copyright Alexander Nasonov, 2007.
+//  Copyright Antony Polukhin, 2023-2026.
 //
 //  Distributed under the Boost
 //  Software License, Version 1.0. (See accompanying file
@@ -10,30 +11,11 @@
 //
 //  Test that Source can be non-copyable.
 
-#include <boost/config.hpp>
+#include <boost/core/noncopyable.hpp>
 
-#if defined(__INTEL_COMPILER)
-#pragma warning(disable: 193 383 488 981 1418 1419)
-#elif defined(BOOST_MSVC)
-#pragma warning(disable: 4097 4100 4121 4127 4146 4244 4245 4511 4512 4701 4800)
-#endif
+#include <boost/core/lightweight_test.hpp>
 
 #include <boost/lexical_cast.hpp>
-#include <boost/noncopyable.hpp>
-#include <boost/test/unit_test.hpp>
-
-using namespace boost;
-
-void test_noncopyable();
-
-unit_test::test_suite *init_unit_test_suite(int, char *[])
-{
-    unit_test_framework::test_suite *suite =
-        BOOST_TEST_SUITE("lexical_cast unit test");
-    suite->add(BOOST_TEST_CASE(&test_noncopyable));
-
-    return suite;
-}
 
 class Noncopyable : private boost::noncopyable
 {
@@ -49,6 +31,11 @@ inline std::ostream &operator<<(std::ostream &out, const Noncopyable&)
 void test_noncopyable()
 {
     Noncopyable x;
-    BOOST_CHECK(boost::lexical_cast<std::string>(x) == "Noncopyable");
+    BOOST_TEST(boost::lexical_cast<std::string>(x) == "Noncopyable");
 }
 
+int main()
+{
+    test_noncopyable();
+    return boost::report_errors();
+}

test/pointers_test.cpp

@@ -0,0 +1,88 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <sstream>
+
+#include <boost/lexical_cast.hpp>
+
+#if defined(BOOST_NO_STRINGSTREAM)
+            typedef std::strstream ss_t;
+#else
+            typedef std::stringstream ss_t;
+#endif
+
+void test_void_pointers_conversions()
+{
+    void *p_to_null = NULL;
+    const void *cp_to_data = "Some data";
+    char nonconst_data[5];
+    void *p_to_data = nonconst_data;
+    ss_t ss;
+
+    ss << p_to_null;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(p_to_null), ss.str());
+    ss.str(std::string());
+
+    ss << cp_to_data;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(cp_to_data), ss.str());
+    ss.str(std::string());
+
+    ss << p_to_data;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(p_to_data), ss.str());
+    ss.str(std::string());
+}
+
+struct incomplete_type;
+
+void test_incomplete_type_pointers_conversions()
+{
+    incomplete_type *p_to_null = NULL;
+    const incomplete_type *cp_to_data = NULL;
+    char nonconst_data[5];
+    incomplete_type *p_to_data = reinterpret_cast<incomplete_type*>(nonconst_data);
+    ss_t ss;
+
+    ss << p_to_null;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(p_to_null), ss.str());
+    ss.str(std::string());
+
+    ss << cp_to_data;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(cp_to_data), ss.str());
+    ss.str(std::string());
+
+    ss << p_to_data;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(p_to_data), ss.str());
+    ss.str(std::string());
+}
+
+struct ble;
+typedef struct ble *meh;
+std::ostream& operator <<(std::ostream &o, meh) {
+  o << "yay";
+  return o;
+}
+
+void test_inomplete_type_with_overloaded_ostream_op() {
+    meh heh = NULL;
+    ss_t ss;
+    ss << heh;
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(heh), ss.str());
+}
+
+int main()
+{
+    test_void_pointers_conversions();
+    test_incomplete_type_pointers_conversions();
+    test_inomplete_type_with_overloaded_ostream_op();
+
+    return boost::report_errors();
+}

test/stream_detection_test.cpp

@@ -0,0 +1,298 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <iostream>
+#include <type_traits>
+
+#include <boost/lexical_cast.hpp>
+
+
+///////////////////////// char streamable classes ///////////////////////////////////////////
+
+struct streamable_easy { enum ENU {value = 0}; };
+std::ostream& operator << (std::ostream& ostr, const streamable_easy&) {
+    return ostr << streamable_easy::value;
+}
+std::istream& operator >> (std::istream& istr, const streamable_easy&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, streamable_easy::value);
+    return istr;
+}
+
+struct streamable_medium { enum ENU {value = 1}; };
+template <class CharT>
+typename std::enable_if<std::is_same<CharT, char>::value, std::basic_ostream<CharT>&>::type
+operator << (std::basic_ostream<CharT>& ostr, const streamable_medium&) {
+    return ostr << streamable_medium::value;
+}
+template <class CharT>
+typename std::enable_if<std::is_same<CharT, char>::value, std::basic_istream<CharT>&>::type
+operator >> (std::basic_istream<CharT>& istr, const streamable_medium&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, streamable_medium::value);
+    return istr;
+}
+
+struct streamable_hard { enum ENU {value = 2}; };
+template <class CharT, class TraitsT>
+typename std::enable_if<std::is_same<CharT, char>::value, std::basic_ostream<CharT, TraitsT>&>::type
+operator << (std::basic_ostream<CharT, TraitsT>& ostr, const streamable_hard&) {
+    return ostr << streamable_hard::value;
+}
+template <class CharT, class TraitsT>
+typename std::enable_if<std::is_same<CharT, char>::value, std::basic_istream<CharT, TraitsT>&>::type
+operator >> (std::basic_istream<CharT, TraitsT>& istr, const streamable_hard&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, streamable_hard::value);
+    return istr;
+}
+
+struct streamable_hard2 { enum ENU {value = 3}; };
+template <class TraitsT>
+std::basic_ostream<char, TraitsT>& operator << (std::basic_ostream<char, TraitsT>& ostr, const streamable_hard2&) {
+    return ostr << streamable_hard2::value;
+}
+template <class TraitsT>
+std::basic_istream<char, TraitsT>& operator >> (std::basic_istream<char, TraitsT>& istr, const streamable_hard2&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, streamable_hard2::value);
+    return istr;
+}
+
+
+///////////////////////// wchar_t streamable classes ///////////////////////////////////////////
+
+struct wstreamable_easy { enum ENU {value = 4}; };
+std::wostream& operator << (std::wostream& ostr, const wstreamable_easy&) {
+    return ostr << wstreamable_easy::value;
+}
+std::wistream& operator >> (std::wistream& istr, const wstreamable_easy&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, wstreamable_easy::value);
+    return istr;
+}
+
+struct wstreamable_medium { enum ENU {value = 5}; };
+template <class CharT>
+typename std::enable_if<std::is_same<CharT, wchar_t>::value, std::basic_ostream<CharT>& >::type
+operator << (std::basic_ostream<CharT>& ostr, const wstreamable_medium&) {
+    return ostr << wstreamable_medium::value;
+}
+template <class CharT>
+typename std::enable_if<std::is_same<CharT, wchar_t>::value, std::basic_istream<CharT>& >::type
+operator >> (std::basic_istream<CharT>& istr, const wstreamable_medium&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, wstreamable_medium::value);
+    return istr;
+}
+
+struct wstreamable_hard { enum ENU {value = 6}; };
+template <class CharT, class TraitsT>
+typename std::enable_if<std::is_same<CharT, wchar_t>::value, std::basic_ostream<CharT, TraitsT>&>::type
+operator << (std::basic_ostream<CharT, TraitsT>& ostr, const wstreamable_hard&) {
+    return ostr << wstreamable_hard::value;
+}
+template <class CharT, class TraitsT>
+typename std::enable_if<std::is_same<CharT, wchar_t>::value, std::basic_istream<CharT, TraitsT>&>::type
+operator >> (std::basic_istream<CharT, TraitsT>& istr, const wstreamable_hard&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, wstreamable_hard::value);
+    return istr;
+}
+
+struct wstreamable_hard2 { enum ENU {value = 7}; };
+template <class TraitsT>
+std::basic_ostream<wchar_t, TraitsT>& operator << (std::basic_ostream<wchar_t, TraitsT>& ostr, const wstreamable_hard2&) {
+    return ostr << wstreamable_hard2::value;
+}
+template <class TraitsT>
+std::basic_istream<wchar_t, TraitsT>& operator >> (std::basic_istream<wchar_t, TraitsT>& istr, const wstreamable_hard2&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, wstreamable_hard2::value);
+    return istr;
+}
+
+///////////////////////// char and wchar_t streamable classes ///////////////////////////////////////////
+
+
+struct bistreamable_easy { enum ENU {value = 8}; };
+std::ostream& operator << (std::ostream& ostr, const bistreamable_easy&) {
+    return ostr << bistreamable_easy::value;
+}
+std::istream& operator >> (std::istream& istr, const bistreamable_easy&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, bistreamable_easy::value);
+    return istr;
+}
+
+std::wostream& operator << (std::wostream& ostr, const bistreamable_easy&) {
+    return ostr << bistreamable_easy::value + 100;
+}
+std::wistream& operator >> (std::wistream& istr, const bistreamable_easy&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, bistreamable_easy::value + 100);
+    return istr;
+}
+
+struct bistreamable_medium { enum ENU {value = 9}; };
+template <class CharT>
+std::basic_ostream<CharT>& operator << (std::basic_ostream<CharT>& ostr, const bistreamable_medium&) {
+    return ostr << bistreamable_medium::value + (sizeof(CharT) == 1 ? 0 : 100);
+}
+template <class CharT>
+std::basic_istream<CharT>& operator >> (std::basic_istream<CharT>& istr, const bistreamable_medium&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, bistreamable_medium::value + (sizeof(CharT) == 1 ? 0 : 100));
+    return istr;
+}
+
+struct bistreamable_hard { enum ENU {value = 10}; };
+template <class CharT, class TraitsT>
+std::basic_ostream<CharT, TraitsT>& operator << (std::basic_ostream<CharT, TraitsT>& ostr, const bistreamable_hard&) {
+    return ostr << bistreamable_hard::value + (sizeof(CharT) == 1 ? 0 : 100);
+}
+template <class CharT, class TraitsT>
+std::basic_istream<CharT, TraitsT>& operator >> (std::basic_istream<CharT, TraitsT>& istr, const bistreamable_hard&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, bistreamable_hard::value + (sizeof(CharT) == 1 ? 0 : 100));
+    return istr;
+}
+
+struct bistreamable_hard2 { enum ENU {value = 11}; };
+template <class TraitsT>
+std::basic_ostream<char, TraitsT>& operator << (std::basic_ostream<char, TraitsT>& ostr, const bistreamable_hard2&) {
+    return ostr << bistreamable_hard2::value;
+}
+template <class TraitsT>
+std::basic_istream<char, TraitsT>& operator >> (std::basic_istream<char, TraitsT>& istr, const bistreamable_hard2&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, bistreamable_hard2::value);
+    return istr;
+}
+
+template <class TraitsT>
+std::basic_ostream<wchar_t, TraitsT>& operator << (std::basic_ostream<wchar_t, TraitsT>& ostr, const bistreamable_hard2&) {
+    return ostr << bistreamable_hard2::value + 100;
+}
+template <class TraitsT>
+std::basic_istream<wchar_t, TraitsT>& operator >> (std::basic_istream<wchar_t, TraitsT>& istr, const bistreamable_hard2&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, bistreamable_hard2::value + 100);
+    return istr;
+}
+
+template <class T>
+static void test_ostr_impl() {
+    T streamable;
+    BOOST_TEST_EQ(T::value,  boost::lexical_cast<int>(streamable));
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(T::value),  boost::lexical_cast<std::string>(streamable));
+}
+
+template <class T>
+static void test_wostr_impl() {
+    T streamable;
+    BOOST_TEST_EQ(T::value,  boost::lexical_cast<int>(streamable));
+    // BOOST_TEST_EQ(boost::lexical_cast<std::string>(T::value), boost::lexical_cast<std::string>(streamable)); // Shall not compile???
+    BOOST_TEST(boost::lexical_cast<std::wstring>(T::value) == boost::lexical_cast<std::wstring>(streamable));
+}
+
+template <class T>
+static void test_bistr_impl() {
+    T streamable;
+
+    BOOST_TEST_EQ(T::value,  boost::lexical_cast<int>(streamable));
+    BOOST_TEST_EQ(boost::lexical_cast<std::string>(T::value),  boost::lexical_cast<std::string>(streamable));
+
+    BOOST_TEST(boost::lexical_cast<std::wstring>(T::value + 100) == boost::lexical_cast<std::wstring>(streamable));
+}
+
+void test_ostream_character_detection() {
+    test_ostr_impl<streamable_easy>();
+    test_ostr_impl<streamable_medium>();
+    test_ostr_impl<streamable_hard>();
+    test_ostr_impl<streamable_hard2>();
+
+    test_wostr_impl<wstreamable_easy>();
+    test_wostr_impl<wstreamable_medium>();
+    test_wostr_impl<wstreamable_hard>();
+    test_wostr_impl<wstreamable_hard2>();
+
+    test_bistr_impl<bistreamable_easy>();
+    test_bistr_impl<bistreamable_medium>();
+    test_bistr_impl<bistreamable_hard>();
+    test_bistr_impl<bistreamable_hard2>();
+}
+
+
+template <class T>
+static void test_istr_impl() {
+    boost::lexical_cast<T>(T::value);
+    boost::lexical_cast<T>(boost::lexical_cast<std::string>(T::value));
+}
+
+template <class T>
+static void test_wistr_impl() {
+    boost::lexical_cast<T>(T::value);
+    //boost::lexical_cast<T>(boost::lexical_cast<std::string>(T::value)); // Shall not compile???
+    boost::lexical_cast<T>(boost::lexical_cast<std::wstring>(T::value));
+}
+
+template <class T>
+static void test_bistr_instr_impl() {
+    boost::lexical_cast<T>(T::value);
+    boost::lexical_cast<T>(boost::lexical_cast<std::string>(T::value));
+    boost::lexical_cast<T>(boost::lexical_cast<std::wstring>(T::value + 100));
+}
+
+void test_istream_character_detection() {
+    test_istr_impl<streamable_easy>();
+    test_istr_impl<streamable_medium>();
+    test_istr_impl<streamable_hard>();
+    test_istr_impl<streamable_hard2>();
+
+    test_wistr_impl<wstreamable_easy>();
+    test_wistr_impl<wstreamable_medium>();
+    test_wistr_impl<wstreamable_hard>();
+    test_wistr_impl<wstreamable_hard2>();
+
+    test_bistr_instr_impl<bistreamable_easy>();
+    test_bistr_instr_impl<bistreamable_medium>();
+    test_bistr_instr_impl<bistreamable_hard>();
+    test_bistr_instr_impl<bistreamable_hard2>();
+}
+
+struct wistreamble_ostreamable { enum ENU {value = 200}; };
+std::ostream& operator << (std::ostream& ostr, const wistreamble_ostreamable&) {
+    return ostr << wistreamble_ostreamable::value;
+}
+std::wistream& operator >> (std::wistream& istr, const wistreamble_ostreamable&) {
+    int i = 100;
+    istr >> i;
+    BOOST_TEST_EQ(i, wistreamble_ostreamable::value);
+    return istr;
+}
+
+struct istreamble_wostreamable { enum ENU {value = 201}; };
+std::wostream& operator << (std::wostream& ostr, const istreamble_wostreamable&) {
+    return ostr << istreamble_wostreamable::value;
+}
+std::istream& operator >> (std::istream& istr, const istreamble_wostreamable&) {
+    int i; istr >> i; BOOST_TEST_EQ(i, istreamble_wostreamable::value);
+    return istr;
+}
+
+void test_mixed_stream_character_detection() {
+    //boost::lexical_cast<std::wstring>(std::string("qwe")); // TODO: ALLOW IT AS EXTENSION!
+
+    BOOST_TEST_EQ(boost::lexical_cast<int>(wistreamble_ostreamable::value), wistreamble_ostreamable::value);
+    boost::lexical_cast<wistreamble_ostreamable>(wistreamble_ostreamable::value);
+    BOOST_TEST_EQ(boost::lexical_cast<int>(wistreamble_ostreamable()), wistreamble_ostreamable::value);
+
+    boost::lexical_cast<istreamble_wostreamable>(istreamble_wostreamable::value);
+    BOOST_TEST_EQ(boost::lexical_cast<int>(istreamble_wostreamable()), istreamble_wostreamable::value);
+}
+
+
+int main()
+{
+    test_ostream_character_detection();
+    test_istream_character_detection();
+    test_mixed_stream_character_detection();
+
+    return boost::report_errors();
+}

test/stream_traits_test.cpp

@@ -0,0 +1,195 @@
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#if defined(BOOST_USE_MODULES)
+#undef BOOST_USE_MODULES
+#endif
+#include <boost/lexical_cast/detail/converter_lexical.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/array.hpp>
+#include <boost/container/string.hpp>
+#include <boost/range/iterator_range.hpp>
+#include <boost/utility/string_view.hpp>
+
+#include <type_traits>
+
+template <class T>
+struct is_optimized_stream : std::false_type {};
+
+template <class CharT, class Traits, std::size_t CharacterBufferSize>
+struct is_optimized_stream< boost::detail::lcast::optimized_src_stream<CharT, Traits, CharacterBufferSize> > : std::true_type {};
+
+template <class Source, class Target>
+static void assert_optimized_stream()
+{
+    BOOST_TEST((is_optimized_stream<
+        typename boost::detail::lexical_converter_impl<Source, Target>::from_src_stream
+    >::value));
+}
+
+template <class T>
+static void test_optimized_types_to_string_const()
+{
+    namespace de = boost::detail;
+    typedef de::lexical_cast_stream_traits<T, std::string> trait_1;
+    BOOST_TEST((std::is_same<typename trait_1::src_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_1::target_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_1::char_type, char>::value));
+    assert_optimized_stream<T, std::string>();
+    assert_optimized_stream<T, boost::container::string>();
+
+    typedef de::lexical_cast_stream_traits<const T, std::string> trait_2;
+    BOOST_TEST((std::is_same<typename trait_2::src_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_2::target_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_2::char_type, char>::value));
+
+    typedef de::lexical_cast_stream_traits<T, std::wstring> trait_3;
+    BOOST_TEST((std::is_same<typename trait_3::src_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_3::target_char_t, wchar_t>::value));
+    BOOST_TEST((std::is_same<typename trait_3::char_type, wchar_t>::value));
+    assert_optimized_stream<T, std::wstring>();
+    assert_optimized_stream<T, boost::container::wstring>();
+}
+
+
+template <class T>
+static void test_optimized_types_to_string()
+{
+    test_optimized_types_to_string_const<T>();
+
+    namespace de = boost::detail;
+    typedef de::lexical_cast_stream_traits<std::string, T> trait_4;
+    BOOST_TEST((std::is_same<typename trait_4::src_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_4::target_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_4::char_type, char>::value));
+    assert_optimized_stream<std::string, T>();
+
+    typedef de::lexical_cast_stream_traits<const std::string, T> trait_5;
+    BOOST_TEST((std::is_same<typename trait_5::src_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_5::target_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_5::char_type, char>::value));
+
+    typedef de::lexical_cast_stream_traits<const std::wstring, T> trait_6;
+    BOOST_TEST((std::is_same<typename trait_6::src_char_t, wchar_t>::value));
+    BOOST_TEST((std::is_same<typename trait_6::target_char_t, char>::value));
+    BOOST_TEST((std::is_same<typename trait_6::char_type, wchar_t>::value));
+}
+
+
+template <class T>
+static void test_optimized_types_to_x_string()
+{
+    test_optimized_types_to_string<T>();
+    assert_optimized_stream<std::wstring, T>();
+    assert_optimized_stream<boost::container::wstring, T>();
+}
+
+
+template <class T>
+static void test_optimized_types_to_wstring()
+{
+    assert_optimized_stream<std::wstring, T>();
+    assert_optimized_stream<T, std::wstring>();
+    assert_optimized_stream<boost::container::wstring, T>();
+    assert_optimized_stream<T, boost::container::wstring>();
+}
+
+void test_metafunctions()
+{
+    test_optimized_types_to_x_string<bool>();
+    test_optimized_types_to_x_string<char>();
+    test_optimized_types_to_x_string<unsigned char>();
+    test_optimized_types_to_x_string<signed char>();
+    test_optimized_types_to_x_string<short>();
+    test_optimized_types_to_x_string<unsigned short>();
+    test_optimized_types_to_x_string<int>();
+    test_optimized_types_to_x_string<unsigned int>();
+    test_optimized_types_to_x_string<long>();
+    test_optimized_types_to_x_string<unsigned long>();
+
+#if defined(BOOST_HAS_LONG_LONG)
+    test_optimized_types_to_x_string<boost::ulong_long_type>();
+    test_optimized_types_to_x_string<boost::long_long_type>();
+#elif defined(BOOST_HAS_MS_INT64)
+    test_optimized_types_to_x_string<unsigned __int64>();
+    test_optimized_types_to_x_string<__int64>();
+#endif
+
+    test_optimized_types_to_string<float>();
+    test_optimized_types_to_string<double>();
+    test_optimized_types_to_string<long double>();
+    test_optimized_types_to_string<std::string>();
+    test_optimized_types_to_string<char*>();
+    //test_optimized_types_to_string<char[5]>();
+    //test_optimized_types_to_string<char[1]>();
+    test_optimized_types_to_string<unsigned char*>();
+    //test_optimized_types_to_string<unsigned char[5]>();
+    //test_optimized_types_to_string<unsigned char[1]>();
+    test_optimized_types_to_string<signed char*>();
+    //test_optimized_types_to_string<signed char[5]>();
+    //test_optimized_types_to_string<signed char[1]>();
+    test_optimized_types_to_string<boost::array<char, 1> >();
+    test_optimized_types_to_string<boost::array<char, 5> >();
+    test_optimized_types_to_string<boost::array<unsigned char, 1> >();
+    test_optimized_types_to_string<boost::array<unsigned char, 5> >();
+    test_optimized_types_to_string<boost::array<signed char, 1> >();
+    test_optimized_types_to_string<boost::array<signed char, 5> >();
+    test_optimized_types_to_string<boost::iterator_range<char*> >();
+    test_optimized_types_to_string<boost::iterator_range<unsigned char*> >();
+    test_optimized_types_to_string<boost::iterator_range<signed char*> >();
+
+    test_optimized_types_to_string_const<boost::array<const char, 1> >();
+    test_optimized_types_to_string_const<boost::array<const char, 5> >();
+    test_optimized_types_to_string_const<boost::array<const unsigned char, 1> >();
+    test_optimized_types_to_string_const<boost::array<const unsigned char, 5> >();
+    test_optimized_types_to_string_const<boost::array<const signed char, 1> >();
+    test_optimized_types_to_string_const<boost::array<const signed char, 5> >();
+    test_optimized_types_to_string_const<boost::iterator_range<const char*> >();
+    test_optimized_types_to_string_const<boost::iterator_range<const unsigned char*> >();
+    test_optimized_types_to_string_const<boost::iterator_range<const signed char*> >();
+
+#ifndef BOOST_NO_CXX11_HDR_ARRAY
+    test_optimized_types_to_string<std::array<char, 1> >();
+    test_optimized_types_to_string<std::array<char, 5> >();
+    test_optimized_types_to_string<std::array<unsigned char, 1> >();
+    test_optimized_types_to_string<std::array<unsigned char, 5> >();
+    test_optimized_types_to_string<std::array<signed char, 1> >();
+    test_optimized_types_to_string<std::array<signed char, 5> >();
+
+    test_optimized_types_to_string_const<std::array<const char, 1> >();
+    test_optimized_types_to_string_const<std::array<const char, 5> >();
+    test_optimized_types_to_string_const<std::array<const unsigned char, 1> >();
+    test_optimized_types_to_string_const<std::array<const unsigned char, 5> >();
+    test_optimized_types_to_string_const<std::array<const signed char, 1> >();
+    test_optimized_types_to_string_const<std::array<const signed char, 5> >();
+
+    test_optimized_types_to_wstring<std::array<wchar_t, 42>>();
+    test_optimized_types_to_wstring<std::array<const wchar_t, 42>>();
+#endif
+    
+    test_optimized_types_to_wstring<wchar_t*>();
+    test_optimized_types_to_wstring<const wchar_t*>();
+    test_optimized_types_to_wstring<boost::iterator_range<const wchar_t*>>();
+    test_optimized_types_to_wstring<boost::iterator_range<wchar_t*>>();
+
+    test_optimized_types_to_string<boost::string_view>();
+    test_optimized_types_to_wstring<boost::basic_string_view<wchar_t>>();
+
+#ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
+    test_optimized_types_to_string<std::string_view>();
+    test_optimized_types_to_wstring<std::basic_string_view<wchar_t>>();
+#endif
+}
+
+int main()
+{
+    test_metafunctions();
+
+    return boost::report_errors();
+}
+

test/string_view_test.cpp

@@ -0,0 +1,49 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2012-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+
+#include <boost/utility/string_view.hpp>
+
+#ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
+#include <string_view>
+#endif
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+
+template <class StringView>
+void test_string_view_conversion() {
+    using boost::lexical_cast;
+
+    StringView sw = "1";
+    BOOST_TEST_EQ(lexical_cast<std::string>(sw), "1");
+    BOOST_TEST_EQ(lexical_cast<int>(sw), 1);
+
+    sw = StringView("a\0b", 3);
+    BOOST_TEST_EQ(lexical_cast<std::string>(sw), std::string("a\0b", 3));
+
+    sw = StringView("a\0b", 4);
+    BOOST_TEST_EQ(lexical_cast<std::string>(sw), std::string("a\0b", 4));
+
+    sw = StringView("\0a\0", 3);
+    BOOST_TEST_EQ(lexical_cast<std::string>(sw), std::string("\0a\0", 3));
+}
+
+int main() {
+    test_string_view_conversion<boost::string_view>();
+
+#ifndef BOOST_NO_CXX17_HDR_STRING_VIEW
+    test_string_view_conversion<std::string_view>();
+#endif
+
+    return boost::report_errors();
+}

test/to_pointer_test.cpp

@@ -0,0 +1,18 @@
+//  //  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2013-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/lexical_cast.hpp>
+
+int main()
+{
+    boost::lexical_cast<char*>("Hello");
+    return 1;
+}
+

test/try_lexical_convert.cpp

@@ -0,0 +1,75 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2014-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast/try_lexical_convert.hpp>
+
+using namespace boost::conversion;
+
+void try_uncommon_cases()
+{
+    std::string sres;
+    const bool res1 = try_lexical_convert(std::string("Test string"), sres);
+    BOOST_TEST(res1);
+    BOOST_TEST_EQ(sres, "Test string");
+
+    volatile int vires;
+    const bool res2 = try_lexical_convert(100, vires);
+    BOOST_TEST(res2);
+    BOOST_TEST_EQ(vires, 100);
+
+    const bool res3 = try_lexical_convert("Test string", sres);
+    BOOST_TEST(res3);
+    BOOST_TEST_EQ(sres, "Test string");
+
+    const bool res4 = try_lexical_convert("Test string", sizeof("Test string") - 1, sres);
+    BOOST_TEST(res4);
+    BOOST_TEST_EQ(sres, "Test string");
+
+    int ires;
+    BOOST_TEST(!try_lexical_convert("Test string", ires));
+    BOOST_TEST(!try_lexical_convert(1.1, ires));
+    BOOST_TEST(!try_lexical_convert(-1.9, ires));
+    BOOST_TEST(!try_lexical_convert("1.1", ires));
+    BOOST_TEST(!try_lexical_convert("1000000000000000000000000000000000000000", ires));
+}
+
+
+void try_common_cases()
+{
+    int ires = 0;
+    const bool res1 = try_lexical_convert(std::string("100"), ires);
+    BOOST_TEST(res1);
+    BOOST_TEST_EQ(ires, 100);
+
+    ires = 0;
+    const bool res2 = try_lexical_convert("-100", ires);
+    BOOST_TEST(res2);
+    BOOST_TEST_EQ(ires, -100);
+
+    float fres = 1.0f;
+    const bool res3 = try_lexical_convert("0.0", fres);
+    BOOST_TEST(res3);
+    BOOST_TEST_EQ(fres, 0.0f);
+
+    fres = 1.0f;
+    const bool res4 = try_lexical_convert("0.0", sizeof("0.0") - 1, fres);
+    BOOST_TEST(res4);
+    BOOST_TEST_EQ(fres, 0.0f);
+}
+
+int main()
+{
+    try_uncommon_cases();
+    try_common_cases();
+
+    return boost::report_errors();
+}

test/typedefed_wchar_test.cpp

@@ -0,0 +1,34 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/lexical_cast.hpp>
+
+#include <boost/static_assert.hpp>
+#include <boost/date_time/gregorian/gregorian.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+void parseDate()
+{
+  std::locale locale;
+  boost::date_time::format_date_parser<boost::gregorian::date, wchar_t> parser(L"", locale);
+  boost::date_time::special_values_parser<boost::gregorian::date, wchar_t> svp;
+
+  boost::gregorian::date date = parser.parse_date(L"", L"", svp);
+  (void)date;
+}
+
+
+int main()
+{
+    parseDate();
+    return ::boost::lexical_cast<int>(L"1000") == 1000;
+}
+
+

test/typedefed_wchar_test_runtime.cpp

@@ -0,0 +1,53 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/lexical_cast.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+void test_typedefed_wchar_t(unsigned short)  // wchar_t is a typedef for unsigned short
+{
+    BOOST_TEST(boost::lexical_cast<int>(L'A') == 65);
+    BOOST_TEST(boost::lexical_cast<int>(L'B') == 66);
+
+    BOOST_TEST(boost::lexical_cast<wchar_t>(L"65") == 65);
+    BOOST_TEST(boost::lexical_cast<wchar_t>(L"66") == 66);
+}
+
+template <class T>
+void test_typedefed_wchar_t(T)
+{
+    BOOST_TEST(1);
+}
+
+void test_typedefed_wchar_t_runtime()
+{
+    test_typedefed_wchar_t(L'0');
+}
+
+void test_unsigned_short_to_wstring()
+{
+    // Test case from https://github.com/boostorg/lexical_cast/issues/89
+    unsigned short number = 4550;
+
+    auto res1 = boost::lexical_cast<std::wstring>(number);
+    BOOST_TEST(res1 == L"4550");
+
+    auto res2 = boost::lexical_cast<std::string>(number);
+    BOOST_TEST_EQ(res2, "4550");
+}
+
+int main()
+{
+    test_typedefed_wchar_t_runtime();
+    test_unsigned_short_to_wstring();
+
+    return boost::report_errors();
+}

test/vc8_bug_test.cpp

@@ -0,0 +1,67 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Alexander Nasonov, 2007.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+//
+// This tests now must pass on vc8, because lexical_cast
+// implementation has changed and it does not use stringstream for casts
+// to integral types
+
+#include <boost/cstdint.hpp>
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <string>
+#include <sstream>
+
+#include <boost/lexical_cast.hpp>
+
+#ifdef BOOST_MSVC
+# pragma warning(disable: 4127) // conditional expression is constant
+#endif
+
+using namespace boost;
+
+// See also test_conversion_from_string_to_integral(CharT)
+// in libs/conversion/lexical_cast_test.cpp
+template<class T, class CharT>
+void test_too_long_number(CharT zero)
+{
+    typedef std::numeric_limits<T> limits;
+
+    std::basic_string<CharT> s;
+
+    std::basic_ostringstream<CharT> o;
+    o << (limits::max)() << zero;
+    s = o.str();
+    BOOST_TEST_THROWS(lexical_cast<T>(s), bad_lexical_cast);
+    s[s.size()-1] += static_cast<CharT>(9); // '0' -> '9'
+    BOOST_TEST_THROWS(lexical_cast<T>(s), bad_lexical_cast);
+
+    if (limits::is_signed)
+    {
+        std::basic_ostringstream<CharT> o2;
+        o2 << (limits::min)() << zero;
+        s = o2.str();
+        BOOST_TEST_THROWS(lexical_cast<T>(s), bad_lexical_cast);
+        s[s.size()-1] += static_cast<CharT>(9); // '0' -> '9'
+        BOOST_TEST_THROWS(lexical_cast<T>(s), bad_lexical_cast);
+    }
+}
+
+int main()
+{
+    test_too_long_number<boost::intmax_t>('0');
+    test_too_long_number<boost::uintmax_t>('0');
+#if !defined(BOOST_LCAST_NO_WCHAR_T)
+    test_too_long_number<boost::intmax_t>(L'0');
+    test_too_long_number<boost::uintmax_t>(L'0');
+#endif
+
+    return boost::report_errors();
+}

test/wchars_test.cpp

@@ -0,0 +1,131 @@
+//  Unit test for boost::lexical_cast.
+//
+//  See http://www.boost.org for most recent version, including documentation.
+//
+//  Copyright Antony Polukhin, 2011-2026.
+//
+//  Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt).
+
+#include <boost/core/lightweight_test.hpp>
+
+#include <boost/lexical_cast.hpp>
+
+#if defined(BOOST_USE_MODULES)
+#undef BOOST_USE_MODULES
+#endif
+#include <boost/lexical_cast/detail/lcast_char_constants.hpp>
+
+#if defined(BOOST_NO_STRINGSTREAM) || defined(BOOST_NO_STD_WSTRING)
+#define BOOST_LCAST_NO_WCHAR_T
+#endif
+
+template <class CharT>
+void test_impl(const CharT* wc_arr)
+{
+    typedef CharT                       wide_char;
+    typedef std::basic_string<CharT>    wide_string;
+    const char c_arr[]            = "Test array of chars";
+    const unsigned char uc_arr[]  = "Test array of chars";
+    const signed char sc_arr[]    = "Test array of chars";
+
+    // Following tests depend on realization of std::locale
+    // and pass for popular compilers and STL realizations
+    BOOST_TEST(boost::lexical_cast<wide_char>(c_arr[0]) == wc_arr[0]);
+    BOOST_TEST(boost::lexical_cast<wide_string>(c_arr) == wide_string(wc_arr));
+
+    BOOST_TEST(boost::lexical_cast<wide_string>(sc_arr) == wide_string(wc_arr) );
+    BOOST_TEST(boost::lexical_cast<wide_string>(uc_arr) == wide_string(wc_arr) );
+
+    BOOST_TEST(boost::lexical_cast<wide_char>(uc_arr[0]) == wc_arr[0]);
+    BOOST_TEST(boost::lexical_cast<wide_char>(sc_arr[0]) == wc_arr[0]);
+}
+
+
+void test_char_types_conversions_wchar_t()
+{
+#ifndef BOOST_LCAST_NO_WCHAR_T
+    test_impl(L"Test array of chars");
+    wchar_t c = boost::detail::lcast_char_constants<wchar_t>::zero;
+    BOOST_TEST(L'0' == c);
+
+    c = boost::detail::lcast_char_constants<wchar_t>::minus;
+    BOOST_TEST(L'-' == c);
+
+    c = boost::detail::lcast_char_constants<wchar_t>::plus;
+    BOOST_TEST(L'+' == c);
+
+    c = boost::detail::lcast_char_constants<wchar_t>::lowercase_e;
+    BOOST_TEST(L'e' == c);
+
+    c = boost::detail::lcast_char_constants<wchar_t>::capital_e;
+    BOOST_TEST(L'E' == c);
+
+    c = boost::detail::lcast_char_constants<wchar_t>::c_decimal_separator;
+    BOOST_TEST(L'.' == c);
+#endif
+
+    BOOST_TEST(true);
+}
+
+void test_char_types_conversions_char16_t()
+{
+#if !defined(BOOST_NO_CXX11_CHAR16_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && defined(BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES)
+    test_impl(u"Test array of chars");
+    char16_t c = boost::detail::lcast_char_constants<char16_t>::zero;
+    BOOST_TEST(u'0' == c);
+
+    c = boost::detail::lcast_char_constants<char16_t>::minus;
+    BOOST_TEST(u'-' == c);
+
+    c = boost::detail::lcast_char_constants<char16_t>::plus;
+    BOOST_TEST(u'+' == c);
+
+    c = boost::detail::lcast_char_constants<char16_t>::lowercase_e;
+    BOOST_TEST(u'e' == c);
+
+    c = boost::detail::lcast_char_constants<char16_t>::capital_e;
+    BOOST_TEST(u'E' == c);
+
+    c = boost::detail::lcast_char_constants<char16_t>::c_decimal_separator;
+    BOOST_TEST(u'.' == c);
+#endif
+
+    BOOST_TEST(true);
+}
+
+void test_char_types_conversions_char32_t()
+{
+#if !defined(BOOST_NO_CXX11_CHAR32_T) && !defined(BOOST_NO_CXX11_UNICODE_LITERALS) && defined(BOOST_STL_SUPPORTS_NEW_UNICODE_LOCALES)
+    test_impl(U"Test array of chars");
+    char32_t c = boost::detail::lcast_char_constants<char32_t>::zero;
+    BOOST_TEST(U'0' == c);
+
+    c = boost::detail::lcast_char_constants<char32_t>::minus;
+    BOOST_TEST(U'-' == c);
+
+    c = boost::detail::lcast_char_constants<char32_t>::plus;
+    BOOST_TEST(U'+' == c);
+
+    c = boost::detail::lcast_char_constants<char32_t>::lowercase_e;
+    BOOST_TEST(U'e' == c);
+
+    c = boost::detail::lcast_char_constants<char32_t>::capital_e;
+    BOOST_TEST(U'E', == c);
+
+    c = boost::detail::lcast_char_constants<char32_t>::c_decimal_separator;
+    BOOST_TEST(U'.' == c);
+#endif
+
+    BOOST_TEST(true);
+}
+
+int main()
+{
+    test_char_types_conversions_wchar_t();
+    test_char_types_conversions_char16_t();
+    test_char_types_conversions_char32_t();
+
+    return boost::report_errors();
+}