myclass::Look
{
}
myclass::mov()
{
sub = nh_.subscribe<sensor_msgs::LaserScan>("/scan", 100, boost::bind(&myclass::Look, this, _1));

    while(ros::ok()) {

        cmd_VelPublisher.publish(cmd_velMsg);

        ros::Duration(0.1).sleep();
        ros::spinOnce();
        rate.sleep();
}