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_PARTIAL_ORDER 10*4bdff4beSrobert #define _LIBCPP___COMPARE_PARTIAL_ORDER 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__compare/compare_three_way.h> 13*4bdff4beSrobert #include <__compare/ordering.h> 14*4bdff4beSrobert #include <__compare/weak_order.h> 15*4bdff4beSrobert #include <__config> 16*4bdff4beSrobert #include <__type_traits/decay.h> 17*4bdff4beSrobert #include <__type_traits/is_same.h> 18*4bdff4beSrobert #include <__utility/forward.h> 19*4bdff4beSrobert #include <__utility/priority_tag.h> 20*4bdff4beSrobert 21*4bdff4beSrobert #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER 22*4bdff4beSrobert # pragma GCC system_header 23*4bdff4beSrobert #endif 24*4bdff4beSrobert 25*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 26*4bdff4beSrobert 27*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 28*4bdff4beSrobert 29*4bdff4beSrobert // [cmp.alg] 30*4bdff4beSrobert namespace __partial_order { 31*4bdff4beSrobert struct __fn { 32*4bdff4beSrobert // NOLINTBEGIN(libcpp-robust-against-adl) partial_order should use ADL, but only here 33*4bdff4beSrobert template<class _Tp, class _Up> 34*4bdff4beSrobert requires is_same_v<decay_t<_Tp>, decay_t<_Up>> 35*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI static constexpr auto 36*4bdff4beSrobert __go(_Tp&& __t, _Up&& __u, __priority_tag<2>) 37*4bdff4beSrobert noexcept(noexcept(partial_ordering(partial_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))))) 38*4bdff4beSrobert -> decltype( partial_ordering(partial_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) 39*4bdff4beSrobert { return partial_ordering(partial_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))); } 40*4bdff4beSrobert // NOLINTEND(libcpp-robust-against-adl) 41*4bdff4beSrobert 42*4bdff4beSrobert template<class _Tp, class _Up> 43*4bdff4beSrobert requires is_same_v<decay_t<_Tp>, decay_t<_Up>> 44*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI static constexpr auto 45*4bdff4beSrobert __go(_Tp&& __t, _Up&& __u, __priority_tag<1>) 46*4bdff4beSrobert noexcept(noexcept(partial_ordering(compare_three_way()(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))))) 47*4bdff4beSrobert -> decltype( partial_ordering(compare_three_way()(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) 48*4bdff4beSrobert { return partial_ordering(compare_three_way()(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))); } 49*4bdff4beSrobert 50*4bdff4beSrobert template<class _Tp, class _Up> 51*4bdff4beSrobert requires is_same_v<decay_t<_Tp>, decay_t<_Up>> 52*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI static constexpr auto 53*4bdff4beSrobert __go(_Tp&& __t, _Up&& __u, __priority_tag<0>) 54*4bdff4beSrobert noexcept(noexcept(partial_ordering(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))))) 55*4bdff4beSrobert -> decltype( partial_ordering(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) 56*4bdff4beSrobert { return partial_ordering(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))); } 57*4bdff4beSrobert 58*4bdff4beSrobert template<class _Tp, class _Up> 59*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t, _Up&& __u) const 60*4bdff4beSrobert noexcept(noexcept(__go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<2>()))) 61*4bdff4beSrobert -> decltype( __go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<2>())) 62*4bdff4beSrobert { return __go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<2>()); } 63*4bdff4beSrobert }; 64*4bdff4beSrobert } // namespace __partial_order 65*4bdff4beSrobert 66*4bdff4beSrobert inline namespace __cpo { 67*4bdff4beSrobert inline constexpr auto partial_order = __partial_order::__fn{}; 68*4bdff4beSrobert } // namespace __cpo 69*4bdff4beSrobert 70*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 71*4bdff4beSrobert 72*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 73*4bdff4beSrobert 74*4bdff4beSrobert #endif // _LIBCPP___COMPARE_PARTIAL_ORDER 75