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//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCUDACXX___CONCEPTS_INVOCABLE_H
#define _LIBCUDACXX___CONCEPTS_INVOCABLE_H
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__functional/invoke.h"
#include "../__utility/forward.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _LIBCUDACXX_STD_VER > 17
// [concept.invocable]
template<class _Fn, class... _Args>
concept invocable = requires(_Fn&& __fn, _Args&&... __args) {
_CUDA_VSTD::__invoke(_CUDA_VSTD::forward<_Fn>(__fn), _CUDA_VSTD::forward<_Args>(__args)...); // not required to be equality preserving
};
// [concept.regular.invocable]
template<class _Fn, class... _Args>
concept regular_invocable = invocable<_Fn, _Args...>;
template <class _Fun, class... _Args>
concept __invoke_constructible = requires(_Fun&& __fun, _Args&&... __args) {
static_cast<remove_cvref_t<invoke_result_t<_Fun, _Args...>>>(
_CUDA_VSTD::invoke(_CUDA_VSTD::forward<_Fun>(__fun), _CUDA_VSTD::forward<_Args>(__args)...));
};
#elif _LIBCUDACXX_STD_VER > 11
template<class _Fn, class... _Args>
_LIBCUDACXX_CONCEPT_FRAGMENT(
_Invocable_,
requires(_Fn&& __fn, _Args&&... __args)(
(_CUDA_VSTD::invoke(_CUDA_VSTD::forward<_Fn>(__fn), _CUDA_VSTD::forward<_Args>(__args)...))
));
template<class _Fn, class... _Args>
_LIBCUDACXX_CONCEPT invocable = _LIBCUDACXX_FRAGMENT(_Invocable_, _Fn, _Args...);
template<class _Fn, class... _Args>
_LIBCUDACXX_CONCEPT regular_invocable = invocable<_Fn, _Args...>;
template <class _Fun, class... _Args>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__invoke_constructible_,
requires(_Fun&& __fun, _Args&&... __args)(
(static_cast<__remove_cvref_t<invoke_result_t<_Fun, _Args...>>>(
_CUDA_VSTD::invoke(_CUDA_VSTD::forward<_Fun>(__fun), _CUDA_VSTD::forward<_Args>(__args)...)))
));
template <class _Fun, class... _Args>
_LIBCUDACXX_CONCEPT __invoke_constructible = _LIBCUDACXX_FRAGMENT(__invoke_constructible_, _Fun, _Args...);
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___CONCEPTS_INVOCABLE_H
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