1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___CONCEPTS_INVOCABLE_H 10*4bdff4beSrobert #define _LIBCPP___CONCEPTS_INVOCABLE_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__config> 13*4bdff4beSrobert #include <__functional/invoke.h> 14*4bdff4beSrobert #include <__utility/forward.h> 15*4bdff4beSrobert 16*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17*4bdff4beSrobert # pragma GCC system_header 18*4bdff4beSrobert #endif 19*4bdff4beSrobert 20*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 21*4bdff4beSrobert 22*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 23*4bdff4beSrobert 24*4bdff4beSrobert // [concept.invocable] 25*4bdff4beSrobert 26*4bdff4beSrobert template<class _Fn, class... _Args> requires(_Fn && __fn,_Args &&...__args)27*4bdff4beSrobertconcept invocable = requires(_Fn&& __fn, _Args&&... __args) { 28*4bdff4beSrobert _VSTD::invoke(_VSTD::forward<_Fn>(__fn), _VSTD::forward<_Args>(__args)...); // not required to be equality preserving 29*4bdff4beSrobert }; 30*4bdff4beSrobert 31*4bdff4beSrobert // [concept.regular.invocable] 32*4bdff4beSrobert 33*4bdff4beSrobert template<class _Fn, class... _Args> 34*4bdff4beSrobert concept regular_invocable = invocable<_Fn, _Args...>; 35*4bdff4beSrobert 36*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 37*4bdff4beSrobert 38*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 39*4bdff4beSrobert 40*4bdff4beSrobert #endif // _LIBCPP___CONCEPTS_INVOCABLE_H 41