| // Copyright (C) 2016-2021 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-do compile { target c++11 } } |
| |
| #include <type_traits> |
| |
| template<typename... T> |
| constexpr bool is_invocable() { return std::__is_invocable<T...>::value; } |
| |
| template<typename R, typename... T> |
| constexpr bool is_invocable_conv(std::true_type) |
| { |
| using result_type = typename std::__invoke_result<T...>::type; |
| return std::is_void<R>::value || std::is_convertible<result_type, R>::value; |
| } |
| |
| template<typename R, typename... T> |
| constexpr bool is_invocable_conv(std::false_type) { return false; } |
| |
| template<typename R, typename... T> |
| constexpr bool is_invocable_r() |
| { return is_invocable_conv<R, T...>(std::__is_invocable<T...>{}); } |
| |
| #define IS_INVOCABLE_DEFINED |
| #include "value.cc" |
