1e78f53d1SNikolas Klauser // -*- C++ -*- 2e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 3e78f53d1SNikolas Klauser // 4e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 6e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7e78f53d1SNikolas Klauser // 8e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 9e78f53d1SNikolas Klauser 10*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___COMPARE_COMPARE_THREE_WAY_H 11*ce777190SNikolas Klauser #define _LIBCPP___CXX03___COMPARE_COMPARE_THREE_WAY_H 12e78f53d1SNikolas Klauser 1373fbae83SNikolas Klauser #include <__cxx03/__compare/three_way_comparable.h> 1473fbae83SNikolas Klauser #include <__cxx03/__config> 1573fbae83SNikolas Klauser #include <__cxx03/__utility/forward.h> 16e78f53d1SNikolas Klauser 17e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18e78f53d1SNikolas Klauser # pragma GCC system_header 19e78f53d1SNikolas Klauser #endif 20e78f53d1SNikolas Klauser 21e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 22e78f53d1SNikolas Klauser 23e78f53d1SNikolas Klauser #if _LIBCPP_STD_VER >= 20 24e78f53d1SNikolas Klauser 25e78f53d1SNikolas Klauser struct _LIBCPP_TEMPLATE_VIS compare_three_way { 26e78f53d1SNikolas Klauser template <class _T1, class _T2> 27e78f53d1SNikolas Klauser requires three_way_comparable_with<_T1, _T2> 28e78f53d1SNikolas Klauser constexpr _LIBCPP_HIDE_FROM_ABI auto operator()(_T1&& __t, _T2&& __u) const 29e78f53d1SNikolas Klauser noexcept(noexcept(std::forward<_T1>(__t) <=> std::forward<_T2>(__u))) { 30e78f53d1SNikolas Klauser return std::forward<_T1>(__t) <=> std::forward<_T2>(__u); 31e78f53d1SNikolas Klauser } 32e78f53d1SNikolas Klauser 33e78f53d1SNikolas Klauser using is_transparent = void; 34e78f53d1SNikolas Klauser }; 35e78f53d1SNikolas Klauser 36e78f53d1SNikolas Klauser #endif // _LIBCPP_STD_VER >= 20 37e78f53d1SNikolas Klauser 38e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 39e78f53d1SNikolas Klauser 40*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___COMPARE_COMPARE_THREE_WAY_H 41