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.
98 lines
3 KiB
C++
98 lines
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_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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# 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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_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
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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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_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
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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_TZDB_H
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