> However, even with C APIs, all these things end up with something like "fancy OOP" (after all, even Gtk is a C Api). That's because GUI widgets seem to be one

> However, even with C APIs, all these things end up with something like "fancy OOP" (after all, even Gtk is a C Api). That's because GUI widgets seem to be one of the few places really well suited to OO ideas like inheritance and non-trivial getter-setters. How much of the GObject system is there for the benefit of Gtk and C developers and how much is there for interop with other languages and gui builders though? Programming against the C API it seems to be very much not OOP, you're always casting to a base class to call methods on that level, it doesn't appear that the OO system is used much internally.