[Interest] dynamic_cast failing

[Nikos Chantziaras]

On 11/04/15 18:08, René J.V. Bertin wrote:
> Hi,
>
> I have an issue with some KDE4 code (built against Qt 4.8.6) where a
> dynamic_cast fails on OS X but not on Linux (be it with gcc or clang
> 3.5).

You might be hitting some undefined behavior. Do your classes have 
virtual functions? If not, dynamic_cast can fail, as it's only supposed 
to work with polymorphic classes.

To ensure your classes are polymorphic, give them virtual destructors 
(even if they are empty.)