| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___COMPARE_COMPARE_WEAK_ORDER_FALLBACK |
| #define _LIBCPP___COMPARE_COMPARE_WEAK_ORDER_FALLBACK |
| |
| #include <__compare/ordering.h> |
| #include <__compare/weak_order.h> |
| #include <__config> |
| #include <__type_traits/decay.h> |
| #include <__type_traits/is_same.h> |
| #include <__utility/forward.h> |
| #include <__utility/priority_tag.h> |
| |
| #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| // [cmp.alg] |
| namespace __compare_weak_order_fallback { |
| struct __fn { |
| template<class _Tp, class _Up> |
| requires is_same_v<decay_t<_Tp>, decay_t<_Up>> |
| _LIBCPP_HIDE_FROM_ABI static constexpr auto |
| __go(_Tp&& __t, _Up&& __u, __priority_tag<1>) |
| noexcept(noexcept(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) |
| -> decltype( _VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))) |
| { return _VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)); } |
| |
| template<class _Tp, class _Up> |
| requires is_same_v<decay_t<_Tp>, decay_t<_Up>> |
| _LIBCPP_HIDE_FROM_ABI static constexpr auto |
| __go(_Tp&& __t, _Up&& __u, __priority_tag<0>) |
| noexcept(noexcept(_VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u) ? weak_ordering::equivalent : |
| _VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u) ? weak_ordering::less : |
| weak_ordering::greater)) |
| -> decltype( _VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u) ? weak_ordering::equivalent : |
| _VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u) ? weak_ordering::less : |
| weak_ordering::greater) |
| { |
| return _VSTD::forward<_Tp>(__t) == _VSTD::forward<_Up>(__u) ? weak_ordering::equivalent : |
| _VSTD::forward<_Tp>(__t) < _VSTD::forward<_Up>(__u) ? weak_ordering::less : |
| weak_ordering::greater; |
| } |
| |
| template<class _Tp, class _Up> |
| _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t, _Up&& __u) const |
| noexcept(noexcept(__go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<1>()))) |
| -> decltype( __go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<1>())) |
| { return __go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<1>()); } |
| }; |
| } // namespace __compare_weak_order_fallback |
| |
| inline namespace __cpo { |
| inline constexpr auto compare_weak_order_fallback = __compare_weak_order_fallback::__fn{}; |
| } // namespace __cpo |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___COMPARE_COMPARE_WEAK_ORDER_FALLBACK |