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