Increments the reference count for the interface type g_type, and returns the default interface vtable for the type.
If the type is not currently in use, then the default vtable for the type will be created and initialized by calling the base interface
init and default vtable init functions for the type (the base_init and class_init members of
TypeInfo). Calling default_interface_ref is useful when you
want to make sure that signals and properties for an interface have been installed.
| g_type |
an interface type |
|
the default vtable for the interface; call |