derek.holloway
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78 lines
3.1 KiB
C++
78 lines
3.1 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___COMPARE_PARTIAL_ORDER
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#define _LIBCPP___COMPARE_PARTIAL_ORDER
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#include <__compare/compare_three_way.h>
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#include <__compare/ordering.h>
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#include <__compare/weak_order.h>
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#include <__config>
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#include <__type_traits/decay.h>
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#include <__type_traits/is_same.h>
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#include <__utility/forward.h>
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#include <__utility/priority_tag.h>
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#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER >= 20
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// [cmp.alg]
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namespace __partial_order {
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void partial_order() = delete;
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struct __fn {
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// NOLINTBEGIN(libcpp-robust-against-adl) partial_order should use ADL, but only here
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template <class _Tp, class _Up>
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requires is_same_v<decay_t<_Tp>, decay_t<_Up>>
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __go(_Tp&& __t, _Up&& __u, __priority_tag<2>) noexcept(
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noexcept(partial_ordering(partial_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))))
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-> decltype(partial_ordering(partial_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) {
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return partial_ordering(partial_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)));
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}
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// NOLINTEND(libcpp-robust-against-adl)
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template <class _Tp, class _Up>
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requires is_same_v<decay_t<_Tp>, decay_t<_Up>>
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __go(_Tp&& __t, _Up&& __u, __priority_tag<1>) noexcept(
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noexcept(partial_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u)))))
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-> decltype(partial_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) {
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return partial_ordering(compare_three_way()(std::forward<_Tp>(__t), std::forward<_Up>(__u)));
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}
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template <class _Tp, class _Up>
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requires is_same_v<decay_t<_Tp>, decay_t<_Up>>
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_LIBCPP_HIDE_FROM_ABI static constexpr auto __go(_Tp&& __t, _Up&& __u, __priority_tag<0>) noexcept(
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noexcept(partial_ordering(std::weak_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))))
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-> decltype(partial_ordering(std::weak_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)))) {
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return partial_ordering(std::weak_order(std::forward<_Tp>(__t), std::forward<_Up>(__u)));
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}
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template <class _Tp, class _Up>
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_LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Tp&& __t, _Up&& __u) const
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noexcept(noexcept(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>())))
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-> decltype(__go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>())) {
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return __go(std::forward<_Tp>(__t), std::forward<_Up>(__u), __priority_tag<2>());
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}
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};
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} // namespace __partial_order
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inline namespace __cpo {
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inline constexpr auto partial_order = __partial_order::__fn{};
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} // namespace __cpo
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___COMPARE_PARTIAL_ORDER
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