Registers a private structure for an instantiatable type.
This is a convenience function often needed in class initializers. It returns the class structure of the immediate parent type of the class passed in. Since derived classes hold a reference count on their parent classes as long as they are instantiated, the returned class will always exist.
This function is essentially the same as gobject.type_class.TypeClass.ref_, except that the classes reference count isn't incremented. As a consequence, this function may return null if the class of the type passed in does not currently exist (hasn't been referenced before).
A more efficient version of gobject.type_class.TypeClass.peek which works only for static types.
Increments the reference count of the class structure belonging to type. This function will demand-create the class if it doesn't exist already.
An opaque structure used as the base of all classes.