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103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/*
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@Copyright Barrett Adair 2015-2017
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_CLBL_TRTS_IS_INVOCABLE_HPP
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#define BOOST_CLBL_TRTS_IS_INVOCABLE_HPP
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#include <boost/callable_traits/detail/core.hpp>
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#include <boost/callable_traits/detail/is_invocable_impl.hpp>
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namespace boost { namespace callable_traits {
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//[ is_invocable_hpp
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/*`[section:ref_is_invocable is_invocable]
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[heading Header]
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``#include <boost/callable_traits/is_invocable.hpp>``
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[heading Definition]
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*/
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// inherits from either std::true_type or std::false_type
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template<typename T, typename... Args>
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struct is_invocable;
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// inherits from either std::true_type or std::false_type
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template<typename Ret, typename T, typename... Args>
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struct is_invocable_r;
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//<-
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template<typename T, typename... Args>
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struct is_invocable : detail::is_invocable_impl<T, Args...>::type {
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using type = typename detail::is_invocable_impl<T, Args...>::type;
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};
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template<typename Ret, typename T, typename... Args>
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struct is_invocable_r
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: detail::is_invocable_r_impl<
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typename detail::is_invocable_impl<T, Args...>::type, Ret, T, Args...>::type
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{
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using type = typename detail::is_invocable_r_impl<
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typename detail::is_invocable_impl<T, Args...>::type, Ret, T, Args...>::type;
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};
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#ifdef BOOST_CLBL_TRTS_DISABLE_VARIABLE_TEMPLATES
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template<typename T, typename... Args>
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struct is_invocable_v {
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static_assert(std::is_same<T, detail::dummy>::value,
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"Variable templates not supported on this compiler.");
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};
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template<typename Ret, typename T, typename... Args>
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struct is_invocable_r_v {
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static_assert(std::is_same<T, detail::dummy>::value,
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"Variable templates not supported on this compiler.");
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};
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#else
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//->
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// only available when variable templates are supported
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template<typename T, typename... Args>
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//<-
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BOOST_CLBL_TRAITS_INLINE_VAR
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//->
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constexpr bool is_invocable_v = //see below
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//<-
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detail::is_invocable_impl<detail::traits<T>, Args...>::type::value;
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//->
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// only available when variable templates are supported
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template<typename Ret, typename T, typename... Args>
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//<-
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BOOST_CLBL_TRAITS_INLINE_VAR
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//->
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constexpr bool is_invocable_r_v = //see below
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//<-
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detail::is_invocable_r_impl<
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typename detail::is_invocable_impl<T, Args...>::type,
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Ret, T, Args...>::type::value;
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#endif
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}} // namespace boost::callable_traits
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//->
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/*`
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[heading Constraints]
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* none
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[heading Behavior]
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* standalone c++11 implementation of c++17 `std::is_invocable`, `std::is_invocable_r`
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[note ref-qualified overloads of `operator()` with different signatures are not handled correctly yet.]
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[heading Example Program]
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[import ../example/is_invocable.cpp]
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[is_invocable]
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[endsect]
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*/
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//]
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#endif // #ifndef BOOST_CLBL_TRTS_IS_INVOCABLE_HPP
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