chrono_timestamp_provider.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef FLUTTER_FML_TIME_CHRONO_TIMESTAMP_PROVIDER_H_
#define FLUTTER_FML_TIME_CHRONO_TIMESTAMP_PROVIDER_H_
 
#include "flutter/fml/time/timestamp_provider.h"
 
#include "flutter/fml/macros.h"
#include "flutter/fml/time/time_point.h"
 
namespace fml {
 
/// TimestampProvider implementation that is backed by std::chrono::steady_clock
/// meant to be used only in tests for `fml`. Other components needing the
/// current time ticks since epoch should instantiate their own time stamp
/// provider backed by Dart clock.
class ChronoTimestampProvider : TimestampProvider {
 public:
  static ChronoTimestampProvider& Instance() {
    static ChronoTimestampProvider instance;
    return instance;
  }
 
  ~ChronoTimestampProvider() override;
 
  fml::TimePoint Now() override;
 
 private:
  ChronoTimestampProvider();
 
  FML_DISALLOW_COPY_AND_ASSIGN(ChronoTimestampProvider);
};
 
fml::TimePoint ChronoTicksSinceEpoch();
 
}  // namespace fml
 
#endif  // FLUTTER_FML_TIME_CHRONO_TIMESTAMP_PROVIDER_H_