1*349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 2*349cc55cSDimitry Andric // 3*349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*349cc55cSDimitry Andric // 7*349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 8*349cc55cSDimitry Andric 9*349cc55cSDimitry Andric #ifndef _LIBCPP___CONCEPTS_INVOCABLE_H 10*349cc55cSDimitry Andric #define _LIBCPP___CONCEPTS_INVOCABLE_H 11*349cc55cSDimitry Andric 12*349cc55cSDimitry Andric #include <__config> 13*349cc55cSDimitry Andric #include <__functional/invoke.h> 14*349cc55cSDimitry Andric #include <__utility/forward.h> 15*349cc55cSDimitry Andric #include <type_traits> 16*349cc55cSDimitry Andric 17*349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18*349cc55cSDimitry Andric #pragma GCC system_header 19*349cc55cSDimitry Andric #endif 20*349cc55cSDimitry Andric 21*349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 22*349cc55cSDimitry Andric 23*349cc55cSDimitry Andric #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 24*349cc55cSDimitry Andric 25*349cc55cSDimitry Andric // [concept.invocable] 26*349cc55cSDimitry Andric 27*349cc55cSDimitry Andric template<class _Fn, class... _Args> 28*349cc55cSDimitry Andric concept invocable = requires(_Fn&& __fn, _Args&&... __args) { 29*349cc55cSDimitry Andric _VSTD::invoke(_VSTD::forward<_Fn>(__fn), _VSTD::forward<_Args>(__args)...); // not required to be equality preserving 30*349cc55cSDimitry Andric }; 31*349cc55cSDimitry Andric 32*349cc55cSDimitry Andric // [concept.regular.invocable] 33*349cc55cSDimitry Andric 34*349cc55cSDimitry Andric template<class _Fn, class... _Args> 35*349cc55cSDimitry Andric concept regular_invocable = invocable<_Fn, _Args...>; 36*349cc55cSDimitry Andric 37*349cc55cSDimitry Andric #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) 38*349cc55cSDimitry Andric 39*349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 40*349cc55cSDimitry Andric 41*349cc55cSDimitry Andric #endif // _LIBCPP___CONCEPTS_INVOCABLE_H 42