ad2fbea797
This has the benefit of consistent placement for these macros (outside the namespace, not inside it). This, in turn, makes it more obvious that the condition applies to the entire namespace scope. Compile times are also reduced a bit, since the compiler doesn't have to open a namespace just to close it again. This is enforced with a clang-tidy check. As a drive-by this also fixes a few macro comments.
79 lines
2.6 KiB
C++
79 lines
2.6 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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// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
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#ifndef _LIBCPP___CHRONO_TIME_ZONE_LINK_H
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#define _LIBCPP___CHRONO_TIME_ZONE_LINK_H
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#include <version>
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// Enable the contents of the header only when libc++ was built with experimental features enabled.
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#if _LIBCPP_HAS_EXPERIMENTAL_TZDB
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# include <__compare/strong_order.h>
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# include <__config>
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# include <__utility/private_constructor_tag.h>
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# include <string>
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# include <string_view>
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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_PUSH_MACROS
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# include <__undef_macros>
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# if _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
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_LIBCPP_BEGIN_NAMESPACE_STD
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namespace chrono {
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class time_zone_link {
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public:
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[[nodiscard]]
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_LIBCPP_HIDE_FROM_ABI explicit time_zone_link(__private_constructor_tag, string_view __name, string_view __target)
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: __name_{__name}, __target_{__target} {}
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_LIBCPP_HIDE_FROM_ABI time_zone_link(time_zone_link&&) = default;
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_LIBCPP_HIDE_FROM_ABI time_zone_link& operator=(time_zone_link&&) = default;
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI string_view name() const noexcept { return __name_; }
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI string_view target() const noexcept { return __target_; }
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private:
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string __name_;
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// TODO TZDB instead of the name we can store the pointer to a zone. These
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// pointers are immutable. This makes it possible to directly return a
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// pointer in the time_zone in the 'locate_zone' function.
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string __target_;
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};
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[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline bool
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operator==(const time_zone_link& __x, const time_zone_link& __y) noexcept {
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return __x.name() == __y.name();
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}
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[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline strong_ordering
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operator<=>(const time_zone_link& __x, const time_zone_link& __y) noexcept {
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return __x.name() <=> __y.name();
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}
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} // namespace chrono
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_LIBCPP_END_NAMESPACE_STD
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# endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM &&
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// _LIBCPP_HAS_LOCALIZATION
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB
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#endif // _LIBCPP___CHRONO_TIME_ZONE_LINK_H
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