| //===----------------------------------------------------------------------===// |
| // |
| // 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_PARTIAL_ORDER |
| #define _LIBCPP___COMPARE_PARTIAL_ORDER |
| |
| #include <__compare/compare_three_way.h> |
| #include <__compare/ordering.h> |
| #include <__compare/weak_order.h> |
| #include <__config> |
| #include <__utility/forward.h> |
| #include <__utility/priority_tag.h> |
| #include <type_traits> |
| |
| #ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER |
| #pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| // [cmp.alg] |
| namespace __partial_order { |
| 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<2>) |
| noexcept(noexcept(partial_ordering(partial_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))))) |
| -> decltype( partial_ordering(partial_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) |
| { return partial_ordering(partial_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<1>) |
| noexcept(noexcept(partial_ordering(compare_three_way()(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))))) |
| -> decltype( partial_ordering(compare_three_way()(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) |
| { return partial_ordering(compare_three_way()(_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(partial_ordering(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))))) |
| -> decltype( partial_ordering(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u)))) |
| { return partial_ordering(_VSTD::weak_order(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u))); } |
| |
| 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<2>()))) |
| -> decltype( __go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<2>())) |
| { return __go(_VSTD::forward<_Tp>(__t), _VSTD::forward<_Up>(__u), __priority_tag<2>()); } |
| }; |
| } // namespace __partial_order |
| |
| inline namespace __cpo { |
| inline constexpr auto partial_order = __partial_order::__fn{}; |
| } // namespace __cpo |
| |
| #endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CONCEPTS) |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___COMPARE_PARTIAL_ORDER |
