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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___CONCEPTS_RELATION_H10#define _LIBCPP___CONCEPTS_RELATION_H11 12#include <__concepts/predicate.h>13#include <__config>14 15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)16# pragma GCC system_header17#endif18 19_LIBCPP_BEGIN_NAMESPACE_STD20 21#if _LIBCPP_STD_VER >= 2022 23// [concept.relation]24 25template <class _Rp, class _Tp, class _Up>26concept relation =27 predicate<_Rp, _Tp, _Tp> && predicate<_Rp, _Up, _Up> && predicate<_Rp, _Tp, _Up> && predicate<_Rp, _Up, _Tp>;28 29// [concept.equiv]30 31template <class _Rp, class _Tp, class _Up>32concept equivalence_relation = relation<_Rp, _Tp, _Up>;33 34// [concept.strictweakorder]35 36template <class _Rp, class _Tp, class _Up>37concept strict_weak_order = relation<_Rp, _Tp, _Up>;38 39#endif // _LIBCPP_STD_VER >= 2040 41_LIBCPP_END_NAMESPACE_STD42 43#endif // _LIBCPP___CONCEPTS_RELATION_H44