| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_ |
| #define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_ |
| |
| #include <chrono> |
| #include <cstdint> |
| #include <memory> |
| #include <string> |
| |
| #include "absl/base/config.h" |
| #include "absl/time/internal/cctz/include/cctz/civil_time.h" |
| #include "absl/time/internal/cctz/include/cctz/time_zone.h" |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| namespace time_internal { |
| namespace cctz { |
| |
| // A simple interface used to hide time-zone complexities from time_zone::Impl. |
| // Subclasses implement the functions for civil-time conversions in the zone. |
| class TimeZoneIf { |
| public: |
| // A factory function for TimeZoneIf implementations. |
| static std::unique_ptr<TimeZoneIf> Load(const std::string& name); |
| |
| virtual ~TimeZoneIf(); |
| |
| virtual time_zone::absolute_lookup BreakTime( |
| const time_point<seconds>& tp) const = 0; |
| virtual time_zone::civil_lookup MakeTime(const civil_second& cs) const = 0; |
| |
| virtual bool NextTransition(const time_point<seconds>& tp, |
| time_zone::civil_transition* trans) const = 0; |
| virtual bool PrevTransition(const time_point<seconds>& tp, |
| time_zone::civil_transition* trans) const = 0; |
| |
| virtual std::string Version() const = 0; |
| virtual std::string Description() const = 0; |
| |
| protected: |
| TimeZoneIf() {} |
| }; |
| |
| // Convert between time_point<seconds> and a count of seconds since the |
| // Unix epoch. We assume that the std::chrono::system_clock and the |
| // Unix clock are second aligned, but not that they share an epoch. |
| inline std::int_fast64_t ToUnixSeconds(const time_point<seconds>& tp) { |
| return (tp - std::chrono::time_point_cast<seconds>( |
| std::chrono::system_clock::from_time_t(0))) |
| .count(); |
| } |
| inline time_point<seconds> FromUnixSeconds(std::int_fast64_t t) { |
| return std::chrono::time_point_cast<seconds>( |
| std::chrono::system_clock::from_time_t(0)) + |
| seconds(t); |
| } |
| |
| } // namespace cctz |
| } // namespace time_internal |
| ABSL_NAMESPACE_END |
| } // namespace absl |
| |
| #endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_ |