timer.h

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/******************************************************************************
 * Copyright 2018 The Apollo Authors. 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.
 *****************************************************************************/
#pragma once
 
#include <sys/time.h>
 
namespace apollo {
namespace perception {
namespace camera {
 
class Timer {
 public:
  Timer() { Tic(); }
  void Tic() { gettimeofday(&start_tv_, nullptr); }
  uint64_t Toc() {
    struct timeval end_tv;
    gettimeofday(&end_tv, nullptr);
    uint64_t elapsed = (end_tv.tv_sec - start_tv_.tv_sec) * 1000000 +
                       (end_tv.tv_usec - start_tv_.tv_usec);
    Tic();
    return elapsed;
  }
 
 protected:
  struct timeval start_tv_;
};
 
}  // namespace camera
}  // namespace perception
}  // namespace apollo