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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
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___CONCEPTS_RELATION_H
#define _LIBCPP___CONCEPTS_RELATION_H
#include <__concepts/predicate.h>
#include <__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if _LIBCPP_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>;
#endif // _LIBCPP_STD_VER > 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___CONCEPTS_RELATION_H
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