This class is integrated into the openframeworks events system. When a resize event happens we record window size information inside an object of the class. Used to send event messages. In the new openFrameworks release we can find a very illustrative example about how to use events in openFrameworks.
If you have any doubt about the usage of this module you can ask in the forum.
If you want to contribute better documentation or start documenting this section you can do so here
If you find anything wrong with this docs you can report any error by opening an issue