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https://github.com/boostorg/poly_collection.git
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joaquintides
8adeacb3f4
* replaced std::is_final detection trick with __cpp_lib_is_final checking * same with is_invocable * updated (C) * updated release notes
69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
/* Copyright 2016-2026 Joaquin M Lopez Munoz.
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* See http://www.boost.org/libs/poly_collection for library home page.
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*/
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#ifndef BOOST_POLY_COLLECTION_DETAIL_IS_INVOCABLE_HPP
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#define BOOST_POLY_COLLECTION_DETAIL_IS_INVOCABLE_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <type_traits>
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#if __cpp_lib_is_invocable>=201703L
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namespace boost{
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namespace poly_collection{
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namespace detail{
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template <typename F,typename... Args>
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using is_invocable=std::is_invocable<F,Args...>;
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template <typename R,typename F,typename... Args>
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using is_invocable_r=std::is_invocable_r<R,F,Args...>;
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} /* namespace poly_collection::detail */
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} /* namespace poly_collection */
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} /* namespace boost */
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#else
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#include <functional>
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namespace boost{
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namespace poly_collection{
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namespace detail{
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template <typename F,typename... Args>
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struct is_invocable:
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std::is_constructible<
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std::function<void(Args...)>,
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std::reference_wrapper<typename std::remove_reference<F>::type>
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>
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{};
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template <typename R,typename F,typename... Args>
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struct is_invocable_r:
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std::is_constructible<
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std::function<R(Args...)>,
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std::reference_wrapper<typename std::remove_reference<F>::type>
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>
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{};
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} /* namespace poly_collection::detail */
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} /* namespace poly_collection */
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} /* namespace boost */
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#endif
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#endif
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