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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
#include <cuda/std/detail/__config>
#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
#include <cuda/std/__concepts/concept_macros.h>
#include <cuda/std/__concepts/predicate.h>
#include <cuda/std/__cccl/prologue.h>
_LIBCUDACXX_BEGIN_NAMESPACE_STD
#if _CCCL_HAS_CONCEPTS()
// [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>;
#else // ^^^ _CCCL_HAS_CONCEPTS() ^^^ / vvv !_CCCL_HAS_CONCEPTS() vvv
template <class _Rp, class _Tp, class _Up>
_CCCL_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>
_CCCL_CONCEPT relation = _CCCL_FRAGMENT(__relation_, _Rp, _Tp, _Up);
// [concept.equiv]
template <class _Rp, class _Tp, class _Up>
_CCCL_CONCEPT equivalence_relation = relation<_Rp, _Tp, _Up>;
// [concept.strictweakorder]
template <class _Rp, class _Tp, class _Up>
_CCCL_CONCEPT strict_weak_order = relation<_Rp, _Tp, _Up>;
#endif // ^^^ !_CCCL_HAS_CONCEPTS() ^^^
_LIBCUDACXX_END_NAMESPACE_STD
#include <cuda/std/__cccl/epilogue.h>
#endif // _LIBCUDACXX___CONCEPTS_RELATION_H
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