g-type-is-derived (gtype)

gtype -- a g-type ID

True if gtype is a dervied type.

Checks if gtype is derived or in object oriented terminology inherited from another type. This holds true for all non-fundamental types.

(g-type-is-derived "gboolean") => NIL
(g-type-is-derived "GObject") => NIL
(g-type-is-derived "GtkWidget") => T