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// Copyright (C) 2016-2020 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"
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