the GClosure to which the marshaller belongs
a GValue which can store the returned gboolean
a GValue array holding instance and arg1
the invocation hint given as the last argument to g_closure_invoke()
additional data specified when registering the marshaller
A marshaller for a GCClosure with a callback of type gboolean (*callback) (gpointer instance, gint arg1, gpointer user_data) where the gint parameter denotes a flags type.