Abseil Common Libraries (C++) (grcp 依赖)
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72 lines
2.6 KiB
72 lines
2.6 KiB
// 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<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 bool NextTransition(const time_point<seconds>& tp, |
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time_zone::civil_transition* trans) const = 0; |
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virtual bool PrevTransition(const time_point<seconds>& tp, |
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time_zone::civil_transition* trans) const = 0; |
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virtual std::string Version() const = 0; |
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virtual std::string Description() const = 0; |
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protected: |
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TimeZoneIf() {} |
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}; |
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// Convert between time_point<seconds> and a count of seconds since the |
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// 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<seconds>& tp) { |
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return (tp - std::chrono::time_point_cast<seconds>( |
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std::chrono::system_clock::from_time_t(0))).count(); |
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} |
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inline time_point<seconds> FromUnixSeconds(std::int_fast64_t t) { |
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return std::chrono::time_point_cast<seconds>( |
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std::chrono::system_clock::from_time_t(0)) + 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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