public NavigationOccupancyGrid()
 {
     header = new StandardHeader();
     info   = new NavigationMapMetaData();
     data   = null;
 }
 public SensorCompressedImage()
 {
     header = new StandardHeader();
     format = "";
     data   = new byte[0];
 }
 public GeometryPoseStamped()
 {
     header = new StandardHeader();
     pose   = new GeometryPose();
 }
 public GeometryPoseWithCovarianceStamped()
 {
     header = new StandardHeader();
     pose   = new GeometryPoseWithCovariance();
 }
 public SensorJoy()
 {
     header  = new StandardHeader();
     axes    = new float[0];
     buttons = new int[0];
 }