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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_ZONED_TIME_H
#define _LIBCPP___CHRONO_ZONED_TIME_H
#include <version>
// Enable the contents of the header only when libc++ was built with experimental features enabled.
#if _LIBCPP_HAS_EXPERIMENTAL_TZDB
# include <__chrono/calendar.h>
# include <__chrono/duration.h>
# include <__chrono/sys_info.h>
# include <__chrono/system_clock.h>
# include <__chrono/time_zone.h>
# include <__chrono/tzdb_list.h>
# include <__concepts/constructible.h>
# include <__config>
# include <__type_traits/common_type.h>
# include <__type_traits/conditional.h>
# include <__type_traits/remove_cvref.h>
# include <__utility/declval.h>
# include <__utility/move.h>
# include <string_view>
# 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 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM && _LIBCPP_HAS_LOCALIZATION
namespace chrono {
template <class>
struct zoned_traits {};
template <>
struct zoned_traits<const time_zone*> {
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI static const time_zone* default_zone() { return chrono::locate_zone("UTC"); }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI static const time_zone* locate_zone(string_view __name) {
return chrono::locate_zone(__name);
}
};
template <class _Duration, class _TimeZonePtr = const time_zone*>
class zoned_time {
// [time.zone.zonedtime.ctor]/2
static_assert(__is_duration_v<_Duration>,
"the program is ill-formed since _Duration is not a specialization of std::chrono::duration");
// The wording uses the constraints like
// constructible_from<zoned_time, decltype(__traits::locate_zone(string_view{}))>
// Using these constraints in the code causes the compiler to give an
// error that the constraint depends on itself. To avoid that issue use
// the fact it is possible to create this object from a _TimeZonePtr.
using __traits _LIBCPP_NODEBUG = zoned_traits<_TimeZonePtr>;
public:
using duration = common_type_t<_Duration, seconds>;
_LIBCPP_HIDE_FROM_ABI zoned_time()
requires requires { __traits::default_zone(); }
: __zone_{__traits::default_zone()}, __tp_{} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(const zoned_time&) = default;
_LIBCPP_HIDE_FROM_ABI zoned_time& operator=(const zoned_time&) = default;
_LIBCPP_HIDE_FROM_ABI zoned_time(const sys_time<_Duration>& __tp)
requires requires { __traits::default_zone(); }
: __zone_{__traits::default_zone()}, __tp_{__tp} {}
_LIBCPP_HIDE_FROM_ABI explicit zoned_time(_TimeZonePtr __zone) : __zone_{std::move(__zone)}, __tp_{} {}
_LIBCPP_HIDE_FROM_ABI explicit zoned_time(string_view __name)
requires(requires { __traits::locate_zone(string_view{}); } &&
constructible_from<_TimeZonePtr, decltype(__traits::locate_zone(string_view{}))>)
: __zone_{__traits::locate_zone(__name)}, __tp_{} {}
template <class _Duration2>
_LIBCPP_HIDE_FROM_ABI zoned_time(const zoned_time<_Duration2, _TimeZonePtr>& __zt)
requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>>
: __zone_{__zt.get_time_zone()}, __tp_{__zt.get_sys_time()} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(_TimeZonePtr __zone, const sys_time<_Duration>& __tp)
: __zone_{std::move(__zone)}, __tp_{__tp} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(string_view __name, const sys_time<_Duration>& __tp)
requires requires { _TimeZonePtr{__traits::locate_zone(string_view{})}; }
: zoned_time{__traits::locate_zone(__name), __tp} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(_TimeZonePtr __zone, const local_time<_Duration>& __tp)
requires(is_convertible_v<decltype(std::declval<_TimeZonePtr&>() -> to_sys(local_time<_Duration>{})),
sys_time<duration>>)
: __zone_{std::move(__zone)}, __tp_{__zone_->to_sys(__tp)} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(string_view __name, const local_time<_Duration>& __tp)
requires(requires {
_TimeZonePtr{__traits::locate_zone(string_view{})};
} && is_convertible_v<decltype(std::declval<_TimeZonePtr&>() -> to_sys(local_time<_Duration>{})),
sys_time<duration>>)
: zoned_time{__traits::locate_zone(__name), __tp} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(_TimeZonePtr __zone, const local_time<_Duration>& __tp, choose __c)
requires(is_convertible_v<
decltype(std::declval<_TimeZonePtr&>() -> to_sys(local_time<_Duration>{}, choose::earliest)),
sys_time<duration>>)
: __zone_{std::move(__zone)}, __tp_{__zone_->to_sys(__tp, __c)} {}
_LIBCPP_HIDE_FROM_ABI zoned_time(string_view __name, const local_time<_Duration>& __tp, choose __c)
requires(requires {
_TimeZonePtr{__traits::locate_zone(string_view{})};
} && is_convertible_v<decltype(std::declval<_TimeZonePtr&>() -> to_sys(local_time<_Duration>{}, choose::earliest)),
sys_time<duration>>)
: zoned_time{__traits::locate_zone(__name), __tp, __c} {}
template <class _Duration2, class _TimeZonePtr2>
_LIBCPP_HIDE_FROM_ABI zoned_time(_TimeZonePtr __zone, const zoned_time<_Duration2, _TimeZonePtr2>& __zt)
requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>>
: __zone_{std::move(__zone)}, __tp_{__zt.get_sys_time()} {}
// per wording choose has no effect
template <class _Duration2, class _TimeZonePtr2>
_LIBCPP_HIDE_FROM_ABI zoned_time(_TimeZonePtr __zone, const zoned_time<_Duration2, _TimeZonePtr2>& __zt, choose)
requires is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>>
: __zone_{std::move(__zone)}, __tp_{__zt.get_sys_time()} {}
template <class _Duration2, class _TimeZonePtr2>
_LIBCPP_HIDE_FROM_ABI zoned_time(string_view __name, const zoned_time<_Duration2, _TimeZonePtr2>& __zt)
requires(requires {
_TimeZonePtr{__traits::locate_zone(string_view{})};
} && is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>>)
: zoned_time{__traits::locate_zone(__name), __zt} {}
template <class _Duration2, class _TimeZonePtr2>
_LIBCPP_HIDE_FROM_ABI zoned_time(string_view __name, const zoned_time<_Duration2, _TimeZonePtr2>& __zt, choose __c)
requires(requires {
_TimeZonePtr{__traits::locate_zone(string_view{})};
} && is_convertible_v<sys_time<_Duration2>, sys_time<_Duration>>)
: zoned_time{__traits::locate_zone(__name), __zt, __c} {}
_LIBCPP_HIDE_FROM_ABI zoned_time& operator=(const sys_time<_Duration>& __tp) {
__tp_ = __tp;
return *this;
}
_LIBCPP_HIDE_FROM_ABI zoned_time& operator=(const local_time<_Duration>& __tp) {
// TODO TZDB This seems wrong.
// Assigning a non-existent or ambiguous time will throw and not satisfy
// the post condition. This seems quite odd; I constructed an object with
// choose::earliest and that choice is not respected.
// what did LEWG do with this.
// MSVC STL and libstdc++ behave the same
__tp_ = __zone_->to_sys(__tp);
return *this;
}
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI operator sys_time<duration>() const { return get_sys_time(); }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI explicit operator local_time<duration>() const { return get_local_time(); }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI _TimeZonePtr get_time_zone() const { return __zone_; }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI local_time<duration> get_local_time() const { return __zone_->to_local(__tp_); }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI sys_time<duration> get_sys_time() const { return __tp_; }
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI sys_info get_info() const { return __zone_->get_info(__tp_); }
private:
_TimeZonePtr __zone_;
sys_time<duration> __tp_;
};
zoned_time() -> zoned_time<seconds>;
template <class _Duration>
zoned_time(sys_time<_Duration>) -> zoned_time<common_type_t<_Duration, seconds>>;
template <class _TimeZonePtrOrName>
using __time_zone_representation _LIBCPP_NODEBUG =
conditional_t<is_convertible_v<_TimeZonePtrOrName, string_view>,
const time_zone*,
remove_cvref_t<_TimeZonePtrOrName>>;
template <class _TimeZonePtrOrName>
zoned_time(_TimeZonePtrOrName&&) -> zoned_time<seconds, __time_zone_representation<_TimeZonePtrOrName>>;
template <class _TimeZonePtrOrName, class _Duration>
zoned_time(_TimeZonePtrOrName&&, sys_time<_Duration>)
-> zoned_time<common_type_t<_Duration, seconds>, __time_zone_representation<_TimeZonePtrOrName>>;
template <class _TimeZonePtrOrName, class _Duration>
zoned_time(_TimeZonePtrOrName&&, local_time<_Duration>, choose = choose::earliest)
-> zoned_time<common_type_t<_Duration, seconds>, __time_zone_representation<_TimeZonePtrOrName>>;
template <class _Duration, class _TimeZonePtrOrName, class _TimeZonePtr2>
zoned_time(_TimeZonePtrOrName&&, zoned_time<_Duration, _TimeZonePtr2>, choose = choose::earliest)
-> zoned_time<common_type_t<_Duration, seconds>, __time_zone_representation<_TimeZonePtrOrName>>;
using zoned_seconds = zoned_time<seconds>;
template <class _Duration1, class _Duration2, class _TimeZonePtr>
_LIBCPP_HIDE_FROM_ABI bool
operator==(const zoned_time<_Duration1, _TimeZonePtr>& __lhs, const zoned_time<_Duration2, _TimeZonePtr>& __rhs) {
return __lhs.get_time_zone() == __rhs.get_time_zone() && __lhs.get_sys_time() == __rhs.get_sys_time();
}
} // namespace chrono
# endif // _LIBCPP_STD_VER >= 20 && _LIBCPP_HAS_TIME_ZONE_DATABASE && _LIBCPP_HAS_FILESYSTEM &&
// _LIBCPP_HAS_LOCALIZATION
_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS
#endif // _LIBCPP_HAS_EXPERIMENTAL_TZDB
#endif // _LIBCPP___CHRONO_ZONED_TIME_H
|
