1349cc55cSDimitry Andric // -*- C++ -*- 2349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 3349cc55cSDimitry Andric // 4349cc55cSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5349cc55cSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6349cc55cSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7349cc55cSDimitry Andric // 8349cc55cSDimitry Andric //===----------------------------------------------------------------------===// 9349cc55cSDimitry Andric 10349cc55cSDimitry Andric #ifndef _LIBCPP___COMPARE_COMPARE_THREE_WAY_H 11349cc55cSDimitry Andric #define _LIBCPP___COMPARE_COMPARE_THREE_WAY_H 12349cc55cSDimitry Andric 13349cc55cSDimitry Andric #include <__compare/three_way_comparable.h> 1404eeddc0SDimitry Andric #include <__config> 15349cc55cSDimitry Andric #include <__utility/forward.h> 16349cc55cSDimitry Andric 17349cc55cSDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18349cc55cSDimitry Andric # pragma GCC system_header 19349cc55cSDimitry Andric #endif 20349cc55cSDimitry Andric 21349cc55cSDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 22349cc55cSDimitry Andric 2306c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20 24349cc55cSDimitry Andric 25*cb14a3feSDimitry Andric struct _LIBCPP_TEMPLATE_VIS compare_three_way { 26349cc55cSDimitry Andric template <class _T1, class _T2> 27349cc55cSDimitry Andric requires three_way_comparable_with<_T1, _T2> operatorcompare_three_way28*cb14a3feSDimitry Andric constexpr _LIBCPP_HIDE_FROM_ABI auto operator()(_T1&& __t, _T2&& __u) const 29*cb14a3feSDimitry Andric noexcept(noexcept(std::forward<_T1>(__t) <=> std::forward<_T2>(__u))) { 30*cb14a3feSDimitry Andric return std::forward<_T1>(__t) <=> std::forward<_T2>(__u); 31*cb14a3feSDimitry Andric } 32349cc55cSDimitry Andric 33349cc55cSDimitry Andric using is_transparent = void; 34349cc55cSDimitry Andric }; 35349cc55cSDimitry Andric 3606c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20 37349cc55cSDimitry Andric 38349cc55cSDimitry Andric _LIBCPP_END_NAMESPACE_STD 39349cc55cSDimitry Andric 40349cc55cSDimitry Andric #endif // _LIBCPP___COMPARE_COMPARE_THREE_WAY_H 41