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156ab87500
See: * https://discourse.llvm.org/t/rfc-freezing-c-03-headers-in-libc/77319 * https://discourse.llvm.org/t/rfc-project-hand-in-hand-llvm-libc-libc-code-sharing/77701 We're dropping support for C++03 for Zig due to the first change; it would be insane to ship 1018 duplicate header files just for this outdated use case. As a result of the second change, I had to bring in a subset of the headers from llvm-libc since libc++ now depends on these. Hopefully we can continue to get away with not copying the entirety of llvm-libc.
96 lines
2.9 KiB
C++
Vendored
96 lines
2.9 KiB
C++
Vendored
// -*- 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_TZDB_H
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#define _LIBCPP___CHRONO_TZDB_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 <__algorithm/ranges_lower_bound.h>
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# include <__chrono/leap_second.h>
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# include <__chrono/time_zone.h>
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# include <__chrono/time_zone_link.h>
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# include <__config>
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# include <__memory/addressof.h>
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# include <__vector/vector.h>
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# include <stdexcept>
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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 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
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namespace chrono {
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struct tzdb {
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string version;
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vector<time_zone> zones;
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vector<time_zone_link> links;
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vector<leap_second> leap_seconds;
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI const time_zone* __locate_zone(string_view __name) const {
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if (const time_zone* __result = __find_in_zone(__name))
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return __result;
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if (auto __it = ranges::lower_bound(links, __name, {}, &time_zone_link::name);
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__it != links.end() && __it->name() == __name)
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if (const time_zone* __result = __find_in_zone(__it->target()))
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return __result;
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return nullptr;
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}
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[[nodiscard]] _LIBCPP_HIDE_FROM_ABI const time_zone* locate_zone(string_view __name) const {
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if (const time_zone* __result = __locate_zone(__name))
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return __result;
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std::__throw_runtime_error("tzdb: requested time zone not found");
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}
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[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI const time_zone* current_zone() const {
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return __current_zone();
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}
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private:
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_LIBCPP_HIDE_FROM_ABI const time_zone* __find_in_zone(string_view __name) const noexcept {
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if (auto __it = ranges::lower_bound(zones, __name, {}, &time_zone::name);
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__it != zones.end() && __it->name() == __name)
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return std::addressof(*__it);
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return nullptr;
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}
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[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI const time_zone* __current_zone() const;
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};
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} // namespace chrono
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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_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB
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#endif // _LIBCPP___CHRONO_TZDB_H
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