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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
#ifndef _LIBCPP___CHRONO_TZDB_H
#define _LIBCPP___CHRONO_TZDB_H
#include <version>
// Enable the contents of the header only when libc++ was built with experimental features enabled.
#if !defined(_LIBCPP_HAS_NO_INCOMPLETE_TZDB)
# include <__algorithm/ranges_lower_bound.h>
# include <__chrono/leap_second.h>
# include <__chrono/time_zone.h>
# include <__chrono/time_zone_link.h>
# include <__config>
# include <string>
# include <vector>
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# endif
_LIBCPP_PUSH_MACROS
# include <__undef_macros>
_LIBCPP_BEGIN_NAMESPACE_STD
# if _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM) && \
!defined(_LIBCPP_HAS_NO_LOCALIZATION)
namespace chrono {
struct tzdb {
string version;
vector<time_zone> zones;
vector<time_zone_link> links;
vector<leap_second> leap_seconds;
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI const time_zone* __locate_zone(string_view __name) const {
if (const time_zone* __result = __find_in_zone(__name))
return __result;
if (auto __it = ranges::lower_bound(links, __name, {}, &time_zone_link::name);
__it != links.end() && __it->name() == __name)
if (const time_zone* __result = __find_in_zone(__it->target()))
return __result;
return nullptr;
}
_LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI const time_zone* locate_zone(string_view __name) const {
if (const time_zone* __result = __locate_zone(__name))
return __result;
std::__throw_runtime_error("tzdb: requested time zone not found");
}
_LIBCPP_NODISCARD_EXT _LIBCPP_AVAILABILITY_TZDB _LIBCPP_HIDE_FROM_ABI const time_zone* current_zone() const {
return __current_zone();
}
private:
_LIBCPP_HIDE_FROM_ABI const time_zone* __find_in_zone(string_view __name) const noexcept {
if (auto __it = ranges::lower_bound(zones, __name, {}, &time_zone::name);
__it != zones.end() && __it->name() == __name)
return std::addressof(*__it);
return nullptr;
}
[[nodiscard]] _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI const time_zone* __current_zone() const;
};
} // namespace chrono
# endif // _LIBCPP_STD_VER >= 20 && !defined(_LIBCPP_HAS_NO_TIME_ZONE_DATABASE) && !defined(_LIBCPP_HAS_NO_FILESYSTEM)
// && !defined(_LIBCPP_HAS_NO_LOCALIZATION)
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_TZDB)
#endif // _LIBCPP___CHRONO_TZDB_H
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