d332d88b91
This implements the loading of the tzdata.zi file and store its contents in the tzdb struct. This adds all required members except: - the leap seconds, - the locate_zone, and - current_zone. The class time_zone is incomplete and only contains the parts needed for storing the parsed data. The class time_zone_link is fully implemented including its non-member functions. Implements parts of: - P0355 Extending <chrono> to Calendars and Time Zones - P1614 The Mothership has Landed Implements: - P1982 Rename link to time_zone_link
80 lines
2.6 KiB
C++
80 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 !defined(_LIBCPP_HAS_NO_INCOMPLETE_TZDB)
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# include <__compare/strong_order.h>
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# include <__config>
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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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_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 time_zone_link {
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public:
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struct __constructor_tag;
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_LIBCPP_NODISCARD_EXT
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_LIBCPP_HIDE_FROM_ABI explicit time_zone_link(__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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_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI string_view name() const noexcept { return __name_; }
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_LIBCPP_NODISCARD_EXT _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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_LIBCPP_NODISCARD_EXT _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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_LIBCPP_NODISCARD_EXT _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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# endif //_LIBCPP_STD_VER >= 20
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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_LINK_H
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