> Out of curiosity I looked at the code of the Theme Editor which is written
> in C++. And saw, e.g. in the class SkinViewer, that the destructor is
> declared as a non-virtual function. But shouldn't (almost always) destructors
> be declared as virtual functions so that the framework (Qt in this case) can
> correctly destroy custom objects?

The above statement is correct. But it seems also correct that if the destructor is declared as virtual in the base class then it's automatically virtual in all (directly or indirectly) derived classes. So the code in the Theme Editor is OK.

-- 
GMX DSL: Internet-, Telefon- und Handy-Flat ab 19,99 EUR/mtl.  
Bis zu 150 EUR Startguthaben inklusive! http://portal.gmx.net/de/go/dsl