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1// -*- C++ -*-2//===----------------------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#ifndef _LIBCPP___COMPARE_COMPARE_THREE_WAY_H11#define _LIBCPP___COMPARE_COMPARE_THREE_WAY_H12 13#include <__compare/three_way_comparable.h>14#include <__config>15#include <__utility/forward.h>16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)18# pragma GCC system_header19#endif20 21_LIBCPP_BEGIN_NAMESPACE_STD22 23#if _LIBCPP_STD_VER >= 2024 25struct compare_three_way {26 template <class _T1, class _T2>27 requires three_way_comparable_with<_T1, _T2>28 constexpr _LIBCPP_HIDE_FROM_ABI auto operator()(_T1&& __t, _T2&& __u) const29 noexcept(noexcept(std::forward<_T1>(__t) <=> std::forward<_T2>(__u))) {30 return std::forward<_T1>(__t) <=> std::forward<_T2>(__u);31 }32 33 using is_transparent = void;34};35 36#endif // _LIBCPP_STD_VER >= 2037 38_LIBCPP_END_NAMESPACE_STD39 40#endif // _LIBCPP___COMPARE_COMPARE_THREE_WAY_H41