the gobject.Closure to which the marshaller belongs
ignored
2
a gobject.Value array holding the instance and the glib.Variant* parameter
the invocation hint given as the last argument to Closure.invoke
additional data specified when registering the marshaller
2.26
A marshaller for a gobject.CClosure with a callback of type void (*callback) (gpointer instance, GVariant *arg1, gpointer user_data).