task_queue_id.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_TASK_QUEUE_ID_H_
#define FLUTTER_FML_TASK_QUEUE_ID_H_
 
#include "flutter/fml/logging.h"
 
namespace fml {
 
/**
 * `MessageLoopTaskQueues` task dispatcher's internal task queue identifier.
 */
class TaskQueueId {
 public:
  /// This constant indicates whether a task queue has been subsumed by a task
  /// runner.
  static const size_t kUnmerged;
 
  /// This constant indicates an invalid task queue. Used in embedder
  /// supplied task runners not associated with a task queue.
  static const size_t kInvalid;
 
  /// Intializes a task queue with the given value as it's ID.
  explicit TaskQueueId(size_t value) : value_(value) {}
 
  static TaskQueueId Invalid() { return TaskQueueId(kInvalid); }
 
  operator size_t() const {  // NOLINT(google-explicit-constructor)
    return value_;
  }
 
  bool is_valid() const { return value_ != kInvalid; }
 
 private:
  size_t value_ = kUnmerged;
};
 
}  // namespace fml
 
#endif  // FLUTTER_FML_TASK_QUEUE_ID_H_