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_COMPARE_THREE_WAY_RESULT_H 10*4bdff4beSrobert #define _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__config> 13*4bdff4beSrobert #include <__type_traits/make_const_lvalue_ref.h> 14*4bdff4beSrobert #include <__utility/declval.h> 15*4bdff4beSrobert 16*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17*4bdff4beSrobert # pragma GCC system_header 18*4bdff4beSrobert #endif 19*4bdff4beSrobert 20*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 21*4bdff4beSrobert 22*4bdff4beSrobert #if _LIBCPP_STD_VER > 17 23*4bdff4beSrobert 24*4bdff4beSrobert template<class, class, class> 25*4bdff4beSrobert struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result { }; 26*4bdff4beSrobert 27*4bdff4beSrobert template<class _Tp, class _Up> 28*4bdff4beSrobert struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result<_Tp, _Up, decltype( 29*4bdff4beSrobert std::declval<__make_const_lvalue_ref<_Tp>>() <=> std::declval<__make_const_lvalue_ref<_Up>>(), void() 30*4bdff4beSrobert )> { 31*4bdff4beSrobert using type = decltype(std::declval<__make_const_lvalue_ref<_Tp>>() <=> std::declval<__make_const_lvalue_ref<_Up>>()); 32*4bdff4beSrobert }; 33*4bdff4beSrobert 34*4bdff4beSrobert template<class _Tp, class _Up = _Tp> 35*4bdff4beSrobert struct _LIBCPP_TEMPLATE_VIS compare_three_way_result : __compare_three_way_result<_Tp, _Up, void> { }; 36*4bdff4beSrobert 37*4bdff4beSrobert template<class _Tp, class _Up = _Tp> 38*4bdff4beSrobert using compare_three_way_result_t = typename compare_three_way_result<_Tp, _Up>::type; 39*4bdff4beSrobert 40*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17 41*4bdff4beSrobert 42*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 43*4bdff4beSrobert 44*4bdff4beSrobert #endif // _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H 45