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Add workaround to is_byte_container for Eigen interop.

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Fixes: https://github.com/boostorg/multiprecision/issues/393
This commit is contained in:
jzmaddock
2021-12-04 11:56:57 +00:00
parent fb9ab60e86
commit fb312b02e3
3 changed files with 28 additions and 3 deletions
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include/boost/multiprecision/traits/is_byte_container.hpp
+10 -3
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@@ -22,13 +22,20 @@ struct has_member_const_iterator
};
template <class C, bool b>
struct is_byte_container_imp
template <class C, class Iterator>
struct is_byte_container_imp_2
{
// Note: Don't use C::value_type as this is a rather widespread typedef, even for non-range types
using container_value_type = typename std::remove_cv<typename std::iterator_traits<typename C::const_iterator>::value_type>::type;
static constexpr const bool value = boost::multiprecision::detail::is_integral<container_value_type>::value && (sizeof(container_value_type) == 1);
};
template <class C>
struct is_byte_container_imp_2<C, void> : public boost::false_type
{};
template <class C, bool b>
struct is_byte_container_imp : public is_byte_container_imp_2<C, typename C::const_iterator>
{
};
template <class C>
struct is_byte_container_imp<C, false> : public boost::false_type
test/Jamfile.v2
+1
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@@ -1173,6 +1173,7 @@ test-suite misc :
[ run test_eigen_interop_mpfr_3.cpp mpfr gmp : : : release [ check-target-builds ../config//has_eigen : : <build>no ] [ check-target-builds ../config//has_mpfr : : <build>no ] ]
[ run test_eigen_interop_gmp.cpp gmp : : : release [ check-target-builds ../config//has_eigen : : <build>no ] [ check-target-builds ../config//has_gmp : : <build>no ] ]
[ run test_eigen_interop_mpc.cpp mpc mpfr gmp : : : release [ check-target-builds ../config//has_eigen : : <build>no ] [ check-target-builds ../config//has_mpc : : <build>no ] ]
[ run git_issue_393.cpp : : : release [ check-target-builds ../config//has_eigen : : <build>no ] ]
;
test/git_issue_393.cpp
+17
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@@ -0,0 +1,17 @@
///////////////////////////////////////////////////////////////
// Copyright 2021 John Maddock. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
//
#include <Eigen/Dense>
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/eigen.hpp>
typedef boost::multiprecision::cpp_rational NT;
typedef Eigen::Matrix<NT, Eigen::Dynamic, Eigen::Dynamic> M;
void f(M& m1, M const& m2)
{
m1 = m2 * m2;
}