[Kget] Refactor transferhandler & transfergrouphandler?

[Carsten Pfeiffer]

Am Mittwoch, 13. August 2008 schrieb Lukas Appelhans:

> > I thought you would dynamic_cast for TransferGroupHandler instead of the
> > base Handler class? AFAIK there is no problem to
> > dynamic_cast<TransferGroupHandler*>(someHandlerPtr)
>
> that won't work afaik, dynamic_cast can only cast downwards...

If the hierarchy looks like this:

                -----------------------
                | TransferHandlerBase |
                -----------------------
                   A               A
                   |               |
         -----------------   ----------------------
         |TransferHandler|   |TransferHandlerGroup|
         -----------------   ----------------------

then the following works just fine:

TransferHandlerBase *handler = getSomeHandler();// returns one of the two
TransferHandlerGroup *group = dynamic_cast<TransferHandlerGroup*>(handler);

group will be 0 if handler is not of type TransferHandlerGroup *.
group will be a valid pointer if handler is of type TransferHandlerGroup *.

Cheers,
Carsten
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