message: change to reference variable
diff: @@ -311,7 +311,7 @@ int KeypointDetector::AddExtraCandidatesForBoxes(
  return num_keypoints_added;
  }
  - Keypoint curr_keypoint = keypoints[num_keypoints_added++];
  + Keypoint &curr_keypoint = keypoints[num_keypoints_added++];
  curr_keypoint.pos_ = Point2f(
  box.left_ + box.GetWidth() * (i + 0.5f) / kNumToAddAsCandidates,
  box.top_ + box.GetHeight() * (j + 0.5f) / kNumToAddAsCandidates);
  