71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
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// 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_IF_H_
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#define ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_
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#include <chrono>
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#include <cstdint>
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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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namespace absl {
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namespace time_internal {
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namespace cctz {
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// A simple interface used to hide time-zone complexities from time_zone::Impl.
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// Subclasses implement the functions for civil-time conversions in the zone.
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class TimeZoneIf {
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public:
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// A factory function for TimeZoneIf implementations.
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static std::unique_ptr<TimeZoneIf> Load(const std::string& name);
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virtual ~TimeZoneIf();
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virtual time_zone::absolute_lookup BreakTime(
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const time_point<sys_seconds>& tp) const = 0;
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virtual time_zone::civil_lookup MakeTime(
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const civil_second& cs) const = 0;
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virtual std::string Description() const = 0;
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virtual bool NextTransition(time_point<sys_seconds>* tp) const = 0;
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virtual bool PrevTransition(time_point<sys_seconds>* tp) const = 0;
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protected:
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TimeZoneIf() {}
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};
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// Convert between time_point<sys_seconds> and a count of seconds since
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// the Unix epoch. We assume that the std::chrono::system_clock and the
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// Unix clock are second aligned, but not that they share an epoch.
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inline std::int_fast64_t ToUnixSeconds(const time_point<sys_seconds>& tp) {
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return (tp - std::chrono::time_point_cast<sys_seconds>(
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std::chrono::system_clock::from_time_t(0)))
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.count();
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}
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inline time_point<sys_seconds> FromUnixSeconds(std::int_fast64_t t) {
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return std::chrono::time_point_cast<sys_seconds>(
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std::chrono::system_clock::from_time_t(0)) +
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sys_seconds(t);
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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_IF_H_
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