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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H 10 #define _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H 11 12 #include <__concepts/boolean_testable.h> 13 #include <__concepts/equality_comparable.h> 14 #include <__config> 15 #include <type_traits> 16 17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18 # pragma GCC system_header 19 #endif 20 21 _LIBCPP_BEGIN_NAMESPACE_STD 22 23 #if _LIBCPP_STD_VER > 17 24 25 // [concept.totallyordered] 26 27 template<class _Tp, class _Up> 28 concept __partially_ordered_with = 29 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 40 template<class _Tp> 41 concept totally_ordered = equality_comparable<_Tp> && __partially_ordered_with<_Tp, _Tp>; 42 43 template<class _Tp, class _Up> 44 concept totally_ordered_with = 45 totally_ordered<_Tp> && totally_ordered<_Up> && 46 equality_comparable_with<_Tp, _Up> && 47 totally_ordered< 48 common_reference_t< 49 __make_const_lvalue_ref<_Tp>, 50 __make_const_lvalue_ref<_Up>>> && 51 __partially_ordered_with<_Tp, _Up>; 52 53 #endif // _LIBCPP_STD_VER > 17 54 55 _LIBCPP_END_NAMESPACE_STD 56 57 #endif // _LIBCPP___CONCEPTS_TOTALLY_ORDERED_H 58