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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_COMMON_REFERENCE_WITH_H
#define _LIBCUDACXX___CONCEPTS_COMMON_REFERENCE_WITH_H
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__concepts/convertible_to.h"
#include "../__concepts/same_as.h"
#include "../__type_traits/common_reference.h"
#include "../__type_traits/copy_cv.h"
#include "../__type_traits/copy_cvref.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.commonref]
template<class _Tp, class _Up>
concept common_reference_with =
same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>> &&
convertible_to<_Tp, common_reference_t<_Tp, _Up>> &&
convertible_to<_Up, common_reference_t<_Tp, _Up>>;
#elif _LIBCUDACXX_STD_VER > 11
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__common_reference_exists_,
requires()(
typename(common_reference_t<_Tp, _Up>),
typename(common_reference_t<_Up, _Tp>)
));
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT _Common_reference_exists = _LIBCUDACXX_FRAGMENT(__common_reference_exists_, _Tp, _Up);
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__common_reference_with_,
requires()(
requires(_Common_reference_exists<_Tp, _Up>),
requires(same_as<common_reference_t<_Tp, _Up>, common_reference_t<_Up, _Tp>>),
requires(convertible_to<_Tp, common_reference_t<_Tp, _Up>>),
requires(convertible_to<_Up, common_reference_t<_Tp, _Up>>)
));
template<class _Tp, class _Up>
_LIBCUDACXX_CONCEPT common_reference_with = _LIBCUDACXX_FRAGMENT(__common_reference_with_, _Tp, _Up);
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___CONCEPTS_COMMON_REFERENCE_WITH_H
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