1349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 2349cc55cSDimitry Andric // 3349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6349cc55cSDimitry Andric // 7349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 8349cc55cSDimitry Andric 9349cc55cSDimitry Andric #ifndef _LIBCPP___CONCEPTS_INVOCABLE_H 10349cc55cSDimitry Andric #define _LIBCPP___CONCEPTS_INVOCABLE_H 11349cc55cSDimitry Andric 12349cc55cSDimitry Andric #include <__config> 13349cc55cSDimitry Andric #include <__functional/invoke.h> 14349cc55cSDimitry Andric #include <__utility/forward.h> 15349cc55cSDimitry Andric 16349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17349cc55cSDimitry Andric # pragma GCC system_header 18349cc55cSDimitry Andric #endif 19349cc55cSDimitry Andric 20349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21349cc55cSDimitry Andric 2206c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 23349cc55cSDimitry Andric 24349cc55cSDimitry Andric // [concept.invocable] 25349cc55cSDimitry Andric 26349cc55cSDimitry Andric template <class _Fn, class... _Args> requires(_Fn && __fn,_Args &&...__args)27349cc55cSDimitry Andricconcept invocable = requires(_Fn&& __fn, _Args&&... __args) { 28*5f757f3fSDimitry Andric std::invoke(std::forward<_Fn>(__fn), std::forward<_Args>(__args)...); // not required to be equality preserving 29349cc55cSDimitry Andric }; 30349cc55cSDimitry Andric 31349cc55cSDimitry Andric // [concept.regular.invocable] 32349cc55cSDimitry Andric 33349cc55cSDimitry Andric template <class _Fn, class... _Args> 34349cc55cSDimitry Andric concept regular_invocable = invocable<_Fn, _Args...>; 35349cc55cSDimitry Andric 3606c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 37349cc55cSDimitry Andric 38349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 39349cc55cSDimitry Andric 40349cc55cSDimitry Andric #endif // _LIBCPP___CONCEPTS_INVOCABLE_H 41