The gEventFun class creates an object which contains all the needed information to link a callback function to an event. The gEventFun object will hold all of the callback function information, including the callback function, a short description of what the callback function does, and a list of all preprocessing functions that must be called.
Objects can be created by calls of the form
the callback function
a short description of what the callback function does
a list of preprocessing functions that must be called before the callback function (this can be NULL)
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