text: // 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.
  
  #include "time_zone_if.h"
  #include "time_zone_info.h"
  #include "time_zone_libc.h"
  
  namespace absl {
  inline namespace lts_2018_06_20 {
  namespace time_internal {
  namespace cctz {
  
  std::unique_ptr<TimeZoneIf> TimeZoneIf::Load(const std::string& name) {
    // Support "libc:localtime" and "libc:*" to access the legacy
    // localtime and UTC support respectively from the C library.
    if (name.compare(0, 5, "libc:") == 0) {
      return std::unique_ptr<TimeZoneIf>(new TimeZoneLibC(name.substr(5)));
    }
  
    // Otherwise use the "zoneinfo" implementation by default.
    std::unique_ptr<TimeZoneInfo> tz(new TimeZoneInfo);
    if (!tz->Load(name)) tz.reset();
    return std::unique_ptr<TimeZoneIf>(tz.release());
  }
  
  // Defined out-of-line to avoid emitting a weak vtable in all TUs.
  TimeZoneIf::~TimeZoneIf() {}
  
  }  // namespace cctz
  }  // namespace time_internal
  }  // inline namespace lts_2018_06_20
  }  // namespace absl
  