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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CONCEPTS_INVOCABLE_H
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#define _LIBCPP___CONCEPTS_INVOCABLE_H
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#include <__config>
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#include <__functional/invoke.h>
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#include <__utility/forward.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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// [concept.invocable]
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template <class _Fn, class... _Args>
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concept invocable = requires(_Fn&& __fn, _Args&&... __args) {
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std::invoke(std::forward<_Fn>(__fn), std::forward<_Args>(__args)...); // not required to be equality preserving
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};
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// [concept.regular.invocable]
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template <class _Fn, class... _Args>
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concept regular_invocable = invocable<_Fn, _Args...>;
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_INVOCABLE_H
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