af7882601a
- 9136c06dfa8dbfdde0a427ad3509e34763d607a6 Fix string_view_test and str_cat_test build under MSVC de... by Derek Mauro <dmauro@google.com> - a463820f9441888f4368aa87328599e3209f9b07 Removes constexpr optional<T>::operator->(). This was don... by Abseil Team <absl-team@google.com> - 3bf78a7f126daafff329f7815d507422f1ca378d Remove dependencies on external CCTZ project. by Shaindel Schwartz <shaindel@google.com> - a4ae574a11b1ddf6e88459af3d638cf79aea7ecd Internal change by Jon Cohen <cohenjon@google.com> GitOrigin-RevId: fd5f3d7077270ffc5ea74cdb9e18bbae3b9b46aa Change-Id: I6ab8ab99863716fe9b2745a12ef285f7a6da6d1e
97 lines
3.6 KiB
C++
97 lines
3.6 KiB
C++
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
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#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
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#include <memory>
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#include <string>
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#include "absl/time/internal/cctz/include/cctz/civil_time.h"
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#include "absl/time/internal/cctz/include/cctz/time_zone.h"
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#include "time_zone_if.h"
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#include "time_zone_info.h"
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namespace absl {
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namespace time_internal {
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namespace cctz {
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// time_zone::Impl is the internal object referenced by a cctz::time_zone.
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class time_zone::Impl {
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public:
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// The UTC time zone. Also used for other time zones that fail to load.
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static time_zone UTC();
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// Load a named time zone. Returns false if the name is invalid, or if
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// some other kind of error occurs. Note that loading "UTC" never fails.
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static bool LoadTimeZone(const std::string& name, time_zone* tz);
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// Dereferences the time_zone to obtain its Impl.
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static const time_zone::Impl& get(const time_zone& tz);
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// Clears the map of cached time zones. Primarily for use in benchmarks
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// that gauge the performance of loading/parsing the time-zone data.
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static void ClearTimeZoneMapTestOnly();
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// The primary key is the time-zone ID (e.g., "America/New_York").
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const std::string& name() const { return name_; }
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// Breaks a time_point down to civil-time components in this time zone.
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time_zone::absolute_lookup BreakTime(
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const time_point<sys_seconds>& tp) const {
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return zone_->BreakTime(tp);
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}
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// Converts the civil-time components in this time zone into a time_point.
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// That is, the opposite of BreakTime(). The requested civil time may be
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// ambiguous or illegal due to a change of UTC offset.
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time_zone::civil_lookup MakeTime(const civil_second& cs) const {
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return zone_->MakeTime(cs);
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}
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// Returns an implementation-specific description of this time zone.
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std::string Description() const { return zone_->Description(); }
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// Finds the time of the next/previous offset change in this time zone.
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//
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// By definition, NextTransition(&tp) returns false when tp has its
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// maximum value, and PrevTransition(&tp) returns false when tp has its
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// mimimum value. If the zone has no transitions, the result will also
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// be false no matter what the argument.
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//
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// Otherwise, when tp has its mimimum value, NextTransition(&tp) returns
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// true and sets tp to the first recorded transition. Chains of calls
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// to NextTransition()/PrevTransition() will eventually return false,
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// but it is unspecified exactly when NextTransition(&tp) jumps to false,
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// or what time is set by PrevTransition(&tp) for a very distant tp.
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bool NextTransition(time_point<sys_seconds>* tp) const {
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return zone_->NextTransition(tp);
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}
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bool PrevTransition(time_point<sys_seconds>* tp) const {
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return zone_->PrevTransition(tp);
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}
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private:
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explicit Impl(const std::string& name);
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static const Impl* UTCImpl();
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const std::string name_;
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std::unique_ptr<TimeZoneIf> zone_;
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};
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} // namespace cctz
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} // namespace time_internal
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} // namespace absl
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#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IMPL_H_
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