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_TIMESTAMP_PROVIDER_H_
#define FLUTTER_FML_TIME_TIMESTAMP_PROVIDER_H_
 
#include <cstdint>
 
#include "flutter/fml/time/time_point.h"
 
namespace fml {
 
/// Pluggable provider of monotonic timestamps. Invocations of `Now` must return
/// unique values. Any two consecutive invocations must be ordered.
class TimestampProvider {
 public:
  virtual ~TimestampProvider() {};
 
  // Returns the number of ticks elapsed by a monotonic clock since epoch.
  virtual fml::TimePoint Now() = 0;
};
 
}  // namespace fml
 
#endif  // FLUTTER_FML_TIME_TIMESTAMP_PROVIDER_H_