gobject:type-is-interface (gtype)

gtype -- a g:type-t type ID

True if gtype is an interface type.

Checks if gtype is an interface type. An interface type provides a pure API, the implementation of which is provided by another type, which is then said to conform to the interface. GLib interfaces are somewhat analogous to Java interfaces and C++ classes containing only pure virtual functions, with the difference that GType interfaces are not derivable.

(g:type-is-interface "GAction") => T
(g:type-is-interface (g:gtype "GAction")) => T
(g:type-is-interface "GSimpleAction") => NIL