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List:       koffice-devel
Subject:    C++ help, please...
From:       Thomas Zander <zander () kde ! org>
Date:       2006-05-29 21:28:04
Message-ID: 200605292328.04851.zander () kde ! org
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I've been trying to fix this problem for too long; I must be missing 
something obvious.

In Flake I have an interface for a canvas; the KoCanvasBase class.
I have another class, with a KoCanvasView::setCanvas() method that will 
use the canvas in two ways; as a widget and it will talk to the object 
via the above interface.

In KWord I have a KWCanvas which implements both:
class KWCanvas : public QWidget, public KoCanvasBase

I instantiate it and then pass it to the setCanvas call.  (done in the 
KWGUI class) Obviously I need to downcast it either to QWidget or to 
KoCanvasBase.

In the setCanvas method I then do a dynamic_cast.
Problem is that if I downcast to a KoCanvasBase the dynamic cast to a 
QWidget fails.
Same problem; if I downcast to a QWidget the dynamic cast to a 
KoCanvasBase gives me a nullpointer.

Anyone can restore the sanity by telling me WTF is going on? Or better; 
fix the sources in koffice svn ;)
-- 
Thomas Zander

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