gobject:type-fundamental (gtype)

gtype -- a valid g:type-t type ID

The fundamental g:type-t type ID of the gtype argument.

The fundamental type which is the ancestor of the gtype argument. Fundamental types are types that serve as ultimate bases for the derived types, thus they are the roots of distinct inheritance hierarchies.

(g:type-fundamental "GSimpleAction") => #<GTYPE :name "GObject" :id 80>
(g:type-fundamental "GAction") => #<GTYPE :name "GInterface" :id 8>
(g:type-fundamental "GBytes") => #<GTYPE :name "GBoxed" :id 72>