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+// 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
+//
+// http://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/time/internal/cctz/include/cctz/civil_time.h"
+#include "absl/time/internal/cctz/include/cctz/time_zone.h"
+
+namespace absl {
+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<sys_seconds>& tp) const = 0;
+ virtual time_zone::civil_lookup MakeTime(
+ const civil_second& cs) const = 0;
+
+ virtual std::string Description() const = 0;
+ virtual bool NextTransition(time_point<sys_seconds>* tp) const = 0;
+ virtual bool PrevTransition(time_point<sys_seconds>* tp) const = 0;
+
+ protected:
+ TimeZoneIf() {}
+};
+
+// Convert between time_point<sys_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<sys_seconds>& tp) {
+ return (tp - std::chrono::time_point_cast<sys_seconds>(
+ std::chrono::system_clock::from_time_t(0)))
+ .count();
+}
+inline time_point<sys_seconds> FromUnixSeconds(std::int_fast64_t t) {
+ return std::chrono::time_point_cast<sys_seconds>(
+ std::chrono::system_clock::from_time_t(0)) +
+ sys_seconds(t);
+}
+
+} // namespace cctz
+} // namespace time_internal
+} // namespace absl
+
+#endif // ABSL_TIME_INTERNAL_CCTZ_TIME_ZONE_IF_H_