1fda1776e3
Adds the sys_info class and time_zone::get_info(). The code still has a few quirks and has not been optimized for performance yet. The returned sys_info is compared against the output of the zdump tool in the test giving confidence the implementation is correct. Implements parts of: - P0355 Extending <chrono> to Calendars and Time Zones Implements: - LWGXXXX The sys_info range should be affected by save
98 lines
3.3 KiB
C++
98 lines
3.3 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_H
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#define _LIBCPP___CHRONO_TIME_ZONE_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 !defined(_LIBCPP_HAS_NO_INCOMPLETE_TZDB)
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# include <__chrono/duration.h>
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# include <__chrono/sys_info.h>
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# include <__chrono/system_clock.h>
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# include <__compare/strong_order.h>
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# include <__config>
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# include <__memory/unique_ptr.h>
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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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_LIBCPP_BEGIN_NAMESPACE_STD
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# if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM) && \
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!defined(_LIBCPP_HAS_NO_LOCALIZATION)
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namespace chrono {
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class _LIBCPP_AVAILABILITY_TZDB time_zone {
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_LIBCPP_HIDE_FROM_ABI time_zone() = default;
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public:
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class __impl; // public so it can be used by make_unique.
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// The "constructor".
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//
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// The default constructor is private to avoid the constructor from being
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// part of the ABI. Instead use an __ugly_named function as an ABI interface,
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// since that gives us the ability to change it in the future.
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[[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI static time_zone __create(unique_ptr<__impl>&& __p);
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_LIBCPP_EXPORTED_FROM_ABI ~time_zone();
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_LIBCPP_HIDE_FROM_ABI time_zone(time_zone&&) = default;
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_LIBCPP_HIDE_FROM_ABI time_zone& operator=(time_zone&&) = default;
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI string_view name() const noexcept { return __name(); }
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template <class _Duration>
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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI sys_info get_info(const sys_time<_Duration>& __time) const {
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return __get_info(chrono::time_point_cast<seconds>(__time));
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}
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI const __impl& __implementation() const noexcept { return *__impl_; }
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private:
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[[nodiscard]] _LIBCPP_EXPORTED_FROM_ABI string_view __name() const noexcept;
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[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI sys_info __get_info(sys_seconds __time) const;
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unique_ptr<__impl> __impl_;
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};
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_LIBCPP_NODISCARD_EXT _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline bool
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operator==(const time_zone& __x, const time_zone& __y) noexcept {
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return __x.name() == __y.name();
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}
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_LIBCPP_NODISCARD_EXT _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI inline strong_ordering
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operator<=>(const time_zone& __x, const time_zone& __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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# endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM)
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// && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_TZDB)
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#endif // _LIBCPP___CHRONO_TIME_ZONE_H
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