1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___COMPARE_THREE_WAY_COMPARABLE_H 10*4bdff4beSrobert #define _LIBCPP___COMPARE_THREE_WAY_COMPARABLE_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__compare/common_comparison_category.h> 13*4bdff4beSrobert #include <__compare/ordering.h> 14*4bdff4beSrobert #include <__concepts/common_reference_with.h> 15*4bdff4beSrobert #include <__concepts/equality_comparable.h> 16*4bdff4beSrobert #include <__concepts/same_as.h> 17*4bdff4beSrobert #include <__concepts/totally_ordered.h> 18*4bdff4beSrobert #include <__config> 19*4bdff4beSrobert #include <__type_traits/common_reference.h> 20*4bdff4beSrobert #include <__type_traits/make_const_lvalue_ref.h> 21*4bdff4beSrobert 22*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 23*4bdff4beSrobert # pragma GCC system_header 24*4bdff4beSrobert #endif 25*4bdff4beSrobert 26*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 27*4bdff4beSrobert 28*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 29*4bdff4beSrobert 30*4bdff4beSrobert template<class _Tp, class _Cat> 31*4bdff4beSrobert concept __compares_as = 32*4bdff4beSrobert same_as<common_comparison_category_t<_Tp, _Cat>, _Cat>; 33*4bdff4beSrobert 34*4bdff4beSrobert template<class _Tp, class _Cat = partial_ordering> 35*4bdff4beSrobert concept three_way_comparable = 36*4bdff4beSrobert __weakly_equality_comparable_with<_Tp, _Tp> && 37*4bdff4beSrobert __partially_ordered_with<_Tp, _Tp> && requires(__make_const_lvalue_ref<_Tp> __a,__make_const_lvalue_ref<_Tp> __b)38*4bdff4beSrobert requires(__make_const_lvalue_ref<_Tp> __a, __make_const_lvalue_ref<_Tp> __b) { 39*4bdff4beSrobert { __a <=> __b } -> __compares_as<_Cat>; 40*4bdff4beSrobert }; 41*4bdff4beSrobert 42*4bdff4beSrobert template<class _Tp, class _Up, class _Cat = partial_ordering> 43*4bdff4beSrobert concept three_way_comparable_with = 44*4bdff4beSrobert three_way_comparable<_Tp, _Cat> && 45*4bdff4beSrobert three_way_comparable<_Up, _Cat> && 46*4bdff4beSrobert common_reference_with<__make_const_lvalue_ref<_Tp>, __make_const_lvalue_ref<_Up>> && 47*4bdff4beSrobert three_way_comparable<common_reference_t<__make_const_lvalue_ref<_Tp>, __make_const_lvalue_ref<_Up>>, _Cat> && 48*4bdff4beSrobert __weakly_equality_comparable_with<_Tp, _Up> && 49*4bdff4beSrobert __partially_ordered_with<_Tp, _Up> && requires(__make_const_lvalue_ref<_Tp> __t,__make_const_lvalue_ref<_Up> __u)50*4bdff4beSrobert requires(__make_const_lvalue_ref<_Tp> __t, __make_const_lvalue_ref<_Up> __u) { 51*4bdff4beSrobert { __t <=> __u } -> __compares_as<_Cat>; 52*4bdff4beSrobert { __u <=> __t } -> __compares_as<_Cat>; 53*4bdff4beSrobert }; 54*4bdff4beSrobert 55*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 56*4bdff4beSrobert 57*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 58*4bdff4beSrobert 59*4bdff4beSrobert #endif // _LIBCPP___COMPARE_THREE_WAY_COMPARABLE_H 60