Ok, thanks for trying to help! I'll take a look at the generated code for
something in gtkmm and see if it's any different with regard to ObjectBase
initialization.
On Fri, May 1, 2020 at 3:44 PM Daniel Boles via gtkmm-list <
gtkmm-list@gnome.org> wrote:
>
>
> On Fri, 1 May 2020, 23:40 Josh Bialkowski, <josh.bialkow...@gmail.com>
> wrote:
>
>> It looks like it does, I'm pretty sure this happens in the
>> `panzoomarea_class_.init()` call:
>> ~~~
>> PanZoomArea::PanZoomArea()
>> : // Mark this class as non-derived to allow C++ vfuncs to be
>> skipped.
>> Glib::ObjectBase(nullptr),
>> Gtk::DrawingArea(Glib::ConstructParams(panzoomarea_class_.init()))
>> {}
>>
>
>
> iirc for Builder to work with derived widgets, ObjectBase() needs called
> with a type name or id. but not sure it explains dynamic_cast failing, so
> i'll defer to someone more experienced now!
>
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