Callback for integer message

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Hello Folks,

i am just leanring roscpp and i want to re-write the Simple Publisher and Subscriber) Tutorial with an integer instead of a string. So how have i to write the callback function?

void chatterCallback(const std_msgs::UInt16 msg)
{
     ROS_INFO("I heard: [%d]", msg->data);}
}

But catkin_make says:

error: ‘UInt16’ was not declared in this scope

Have i missed some additional headers so std_msgs/UInt16 message isn't declared yet?

The same problem also appears also for ros::Publisher chatter_pub = n.advertise<UInt16>("test", 5);.

Someone has a hint for me?