58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H
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#define _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H
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#include <__concepts/boolean_testable.h>
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#include <__concepts/equality_comparable.h>
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#include <__config>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17
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// [concept.totallyordered]
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template<class _Tp, class _Up>
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concept __partially_ordered_with =
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requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u) {
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{ __t < __u } -> __boolean_testable;
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{ __t > __u } -> __boolean_testable;
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{ __t <= __u } -> __boolean_testable;
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{ __t >= __u } -> __boolean_testable;
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{ __u < __t } -> __boolean_testable;
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{ __u > __t } -> __boolean_testable;
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{ __u <= __t } -> __boolean_testable;
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{ __u >= __t } -> __boolean_testable;
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};
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template<class _Tp>
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concept totally_ordered = equality_comparable<_Tp> && __partially_ordered_with<_Tp, _Tp>;
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template<class _Tp, class _Up>
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concept totally_ordered_with =
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totally_ordered<_Tp> && totally_ordered<_Up> &&
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equality_comparable_with<_Tp, _Up> &&
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totally_ordered<
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common_reference_t<
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__make_const_lvalue_ref<_Tp>,
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__make_const_lvalue_ref<_Up>>> &&
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__partially_ordered_with<_Tp, _Up>;
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#endif // _LIBCPP_STD_VER > 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H
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