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| 1 | //===----------------------------------------------------------------------===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #ifndef _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H |
| 10 | #define _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H |
| 11 | |
| 12 | #include <__config> |
| 13 | #include <__type_traits/make_const_lvalue_ref.h> |
| 14 | #include <__utility/declval.h> |
| 15 | |
| 16 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 17 | # pragma GCC system_header |
| 18 | #endif |
| 19 | |
| 20 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 21 | |
| 22 | #if _LIBCPP_STD_VER >= 20 |
| 23 | |
| 24 | template <class, class, class> |
| 25 | struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result {}; |
| 26 | |
| 27 | template <class _Tp, class _Up> |
| 28 | struct _LIBCPP_HIDE_FROM_ABI __compare_three_way_result< |
| 29 | _Tp, |
| 30 | _Up, |
| 31 | decltype(std::declval<__make_const_lvalue_ref<_Tp>>() <=> std::declval<__make_const_lvalue_ref<_Up>>(), void())> { |
| 32 | using type _LIBCPP_NODEBUG = |
| 33 | decltype(std::declval<__make_const_lvalue_ref<_Tp>>() <=> std::declval<__make_const_lvalue_ref<_Up>>()); |
| 34 | }; |
| 35 | |
| 36 | template <class _Tp, class _Up = _Tp> |
| 37 | struct _LIBCPP_NO_SPECIALIZATIONS compare_three_way_result : __compare_three_way_result<_Tp, _Up, void> {}; |
| 38 | |
| 39 | template <class _Tp, class _Up = _Tp> |
| 40 | using compare_three_way_result_t = typename compare_three_way_result<_Tp, _Up>::type; |
| 41 | |
| 42 | #endif // _LIBCPP_STD_VER >= 20 |
| 43 | |
| 44 | _LIBCPP_END_NAMESPACE_STD |
| 45 | |
| 46 | #endif // _LIBCPP___COMPARE_COMPARE_THREE_WAY_RESULT_H |
| 47 |
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