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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_RELATION_H
#define _LIBCUDACXX___CONCEPTS_RELATION_H
#ifndef __cuda_std__
#include <__config>
#endif //__cuda_std__
#include "../__concepts/__concept_macros.h"
#include "../__concepts/predicate.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.relation]
template<class _Rp, class _Tp, class _Up>
concept relation =
predicate<_Rp, _Tp, _Tp> && predicate<_Rp, _Up, _Up> &&
predicate<_Rp, _Tp, _Up> && predicate<_Rp, _Up, _Tp>;
// [concept.equiv]
template<class _Rp, class _Tp, class _Up>
concept equivalence_relation = relation<_Rp, _Tp, _Up>;
// [concept.strictweakorder]
template<class _Rp, class _Tp, class _Up>
concept strict_weak_order = relation<_Rp, _Tp, _Up>;
#elif _LIBCUDACXX_STD_VER > 11
template<class _Rp, class _Tp, class _Up>
_LIBCUDACXX_CONCEPT_FRAGMENT(
__relation_,
requires()(
requires(predicate<_Rp, _Tp, _Tp>),
requires(predicate<_Rp, _Up, _Up>),
requires(predicate<_Rp, _Tp, _Up>),
requires(predicate<_Rp, _Up, _Tp>)
));
template<class _Rp, class _Tp, class _Up>
_LIBCUDACXX_CONCEPT relation = _LIBCUDACXX_FRAGMENT(__relation_, _Rp, _Tp, _Up);
// [concept.equiv]
template<class _Rp, class _Tp, class _Up>
_LIBCUDACXX_CONCEPT equivalence_relation = relation<_Rp, _Tp, _Up>;
// [concept.strictweakorder]
template<class _Rp, class _Tp, class _Up>
_LIBCUDACXX_CONCEPT strict_weak_order = relation<_Rp, _Tp, _Up>;
#endif // _LIBCUDACXX_STD_VER > 11
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___CONCEPTS_RELATION_H
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