GObject-2.0 ▶ GObject ▶ type_register_fundamental

Registers type_id as the predefined identifier and type_name as the name of a fundamental type. If type_id is already registered, or a type named type_name is already registered, the behaviour is undefined. The type system uses the information contained in the GObject.TypeInfo structure pointed to by info and the GObject.TypeFundamentalInfo structure pointed to by finfo to manage the type and its instances. The value of flags determines additional characteristics of the fundamental type.