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7f69a399df
These member types were deprecated in C++17 by P0174R2 and removed in C++20 by P0619R4, but the changes in `<variant>` seem missing. Drive-by: Replace one `_NOEXCEPT` with `noexcept` as the `hash` specialization is C++17-and-later only.
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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___VARIANT_MONOSTATE_H
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#define _LIBCPP___VARIANT_MONOSTATE_H
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#include <__compare/ordering.h>
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#include <__config>
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#include <__cstddef/size_t.h>
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#include <__functional/hash.h>
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#if !defined(_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 >= 17
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struct _LIBCPP_TEMPLATE_VIS monostate {};
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator==(monostate, monostate) noexcept { return true; }
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# if _LIBCPP_STD_VER >= 20
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_LIBCPP_HIDE_FROM_ABI inline constexpr strong_ordering operator<=>(monostate, monostate) noexcept {
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return strong_ordering::equal;
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}
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# else // _LIBCPP_STD_VER >= 20
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator!=(monostate, monostate) noexcept { return false; }
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator<(monostate, monostate) noexcept { return false; }
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator>(monostate, monostate) noexcept { return false; }
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator<=(monostate, monostate) noexcept { return true; }
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_LIBCPP_HIDE_FROM_ABI inline constexpr bool operator>=(monostate, monostate) noexcept { return true; }
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# endif // _LIBCPP_STD_VER >= 20
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template <>
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struct _LIBCPP_TEMPLATE_VIS hash<monostate> {
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# if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_BINDER_TYPEDEFS)
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using argument_type _LIBCPP_DEPRECATED_IN_CXX17 = monostate;
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using result_type _LIBCPP_DEPRECATED_IN_CXX17 = size_t;
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# endif
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inline _LIBCPP_HIDE_FROM_ABI size_t operator()(const monostate&) const noexcept {
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return 66740831; // return a fundamentally attractive random value.
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}
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};
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#endif // _LIBCPP_STD_VER >= 17
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___VARIANT_MONOSTATE_H
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