the gobject.Closure to which the marshaller belongs
ignored
2
a gobject.Value array holding the instance and the enumeration parameter
the invocation hint given as the last argument to Closure.invoke
additional data specified when registering the marshaller
A marshaller for a gobject.CClosure with a callback of type void (*callback) (gpointer instance, gint arg1, gpointer user_data) where the gint parameter denotes an enumeration type..