Overriding vfuncs with disabled vfunc API

[Armin Burgmeier <armin arbur net>]

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Hello list,

is it possible somehow (without creating a new GObject on my own) to
override vfuncs when implementing for example a custom Gtk::Container
with disabled vfunc API (GLIBMM_ENABLE_VFUNCS not defined)? The
documentation says the following:

"However, if you really need to override a _vfunc, for instance when
implementing a custom Gtk::TreeModel, you may directly access the
underlying GObject via the gobj() method."

However, I am not sure what I can do with the underlaying GObject in
this case. I can probably use it to get a pointer to the class struct
and register my vfunc there, but this is really hackish because if
another one does the same thing, it will overwrite my vfunc.

Armin
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