I'd like to derive a class from Gtk::TextBuffer and/or Gtk::TextTag. The problem is to get an instance of any of these classes one uses the static member function create that returns a pointer wrapped in Glib::RefPtr. This makes me uncertain if it is possible to derive from these classes in the first place, and if it is possible what should be the best approach to implement a corresponding create function for my class that would return a pointer of the base class type (so it might be used wherever the base is expected).
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