Defining a class in the GObject framework is complex, requiring large amounts of boilerplate code, such as manual definitions of type casting macros and obscure type registration incantations. Also, since a C structure cannot have access modifiers like “public”, “protected”, or “private”, workarounds must be used to provide encapsulation. One approach is to include a pointer to the private data — conventionally called codice_43 — in the instance structure. The "private structure" can be declared in the public header file, but defined only in the implementation file, with the effect that the private data is opaque to users, but transparent to the implementor. If the private structure is registered with GType, it will be automatically allocated by the object system. Indeed, it is not even necessary to include the codice_43 pointer, if one is willing to use the incantation codice_45 every time the private data is needed.