the #GClosure to which the marshaller belongs
a #GValue which can store the returned #gboolean
2
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.