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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_TOTALLY_ORDERED_H10#define _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H11 12#include <__concepts/boolean_testable.h>13#include <__concepts/equality_comparable.h>14#include <__config>15#include <__type_traits/common_reference.h>16#include <__type_traits/make_const_lvalue_ref.h>17 18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)19# pragma GCC system_header20#endif21 22_LIBCPP_BEGIN_NAMESPACE_STD23 24#if _LIBCPP_STD_VER >= 2025 26// [concept.totallyordered]27 28template <class _Tp, class _Up>29concept __partially_ordered_with = requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u) {30 { __t < __u } -> __boolean_testable;31 { __t > __u } -> __boolean_testable;32 { __t <= __u } -> __boolean_testable;33 { __t >= __u } -> __boolean_testable;34 { __u < __t } -> __boolean_testable;35 { __u > __t } -> __boolean_testable;36 { __u <= __t } -> __boolean_testable;37 { __u >= __t } -> __boolean_testable;38};39 40template <class _Tp>41concept totally_ordered = equality_comparable<_Tp> && __partially_ordered_with<_Tp, _Tp>;42 43// clang-format off44template <class _Tp, class _Up>45concept totally_ordered_with =46 totally_ordered<_Tp> && totally_ordered<_Up> &&47 equality_comparable_with<_Tp, _Up> &&48 totally_ordered<49 common_reference_t<50 __make_const_lvalue_ref<_Tp>,51 __make_const_lvalue_ref<_Up>>> &&52 __partially_ordered_with<_Tp, _Up>;53// clang-format on54 55#endif // _LIBCPP_STD_VER >= 2056 57_LIBCPP_END_NAMESPACE_STD58 59#endif // _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H60