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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_STRONG_ORDER_FALLBACK |
| 10 | #define _LIBCPP___COMPARE_COMPARE_STRONG_ORDER_FALLBACK |
| 11 | |
| 12 | #include <__compare/ordering.h> |
| 13 | #include <__compare/strong_order.h> |
| 14 | #include <__concepts/boolean_testable.h> |
| 15 | #include <__config> |
| 16 | #include <__type_traits/decay.h> |
| 17 | #include <__type_traits/is_same.h> |
| 18 | #include <__utility/forward.h> |
| 19 | #include <__utility/priority_tag.h> |
| 20 | |
| 21 | #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER |
| 22 | # pragma GCC system_header |
| 23 | #endif |
| 24 | |
| 25 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 26 | |
| 27 | #if _LIBCPP_STD_VER >= 20 |
| 28 | |
| 29 | // [cmp.alg] |
| 30 | namespace __compare_strong_order_fallback { |
| 31 | struct __fn { |
| 32 | template <class _Tp, class _Up> |
| 33 | requires is_same_v<decay_t<_Tp>, decay_t<_Up>> |
| 34 | _LIBCPP_HIDE_FROM_ABI static constexpr auto __go(_Tp&& __t, _Up&& __u, __priority_tag<1>) noexcept( |
| 35 | noexcept(std::strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) |
| 36 | -> decltype(std::strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u))) { |
| 37 | return std::strong_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)); |
| 38 | } |
| 39 | |
| 40 | template <class _Tp, class _Up> |
| 41 | requires is_same_v<decay_t<_Tp>, decay_t<_Up>> && requires(_Tp&& __t, _Up&& __u) { |
| 42 | { std::forward<_Tp>(__t) == std::forward<_Up>(__u) } -> __boolean_testable; |
| 43 | { std::forward<_Tp>(__t) < std::forward<_Up>(__u) } -> __boolean_testable; |
| 44 | } |
| 45 | _LIBCPP_HIDE_FROM_ABI static constexpr strong_ordering __go(_Tp&& __t, _Up&& __u, __priority_tag<0>) noexcept( |
| 46 | noexcept(std::forward<_Tp>(__t) == std::forward<_Up>(__u) ? strong_ordering::equal |
| 47 | : std::forward<_Tp>(__t) < std::forward<_Up>(__u) ? strong_ordering::less |
| 48 | : strong_ordering::greater)) { |
| 49 | return std::forward<_Tp>(__t) == std::forward<_Up>(__u) ? strong_ordering::equal |
| 50 | : std::forward<_Tp>(__t) < std::forward<_Up>(__u) |
| 51 | ? strong_ordering::less |
| 52 | : strong_ordering::greater; |
| 53 | } |
| 54 | |
| 55 | template <class _Tp, class _Up> |
| 56 | _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t, _Up&& __u) const |
| 57 | noexcept(noexcept(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<1>()))) |
| 58 | -> decltype(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<1>())) { |
| 59 | return __go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<1>()); |
| 60 | } |
| 61 | }; |
| 62 | } // namespace __compare_strong_order_fallback |
| 63 | |
| 64 | inline namespace __cpo { |
| 65 | inline constexpr auto compare_strong_order_fallback = __compare_strong_order_fallback::__fn{}; |
| 66 | } // namespace __cpo |
| 67 | |
| 68 | #endif // _LIBCPP_STD_VER >= 20 |
| 69 | |
| 70 | _LIBCPP_END_NAMESPACE_STD |
| 71 | |
| 72 | #endif // _LIBCPP___COMPARE_COMPARE_STRONG_ORDER_FALLBACK |
| 73 |
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