[Development] QList

[Marc Mutz]

On Thursday 25 May 2017 18:40:46 Christoph Feck wrote:
> If you only return a view to the container, then if the container is 
> modified, the return value is no longer valid. Returning a full 
> container (referenced, with copy-on-write semantics) will not have this 
> problem.

If you return a vector of QRects from QRegion, then modify the QRegion, the 
rectangles you have a no longer valid, either. Yes, the program will not 
crash, nor will Valgrind complain. But it will use outdated information.

If you use the QRegion::begin/end(), and you do the same mistake, you get a 
crash or valgrind complains.

So what you said is that you'd rather have the API hide your mistakes from you 
than to point them out to you.

Interesting approach. I wish you luck persuing it.

Thanks,
Marc
(seriously considering installing Gnome now)

-- 
Marc Mutz <marc.mutz at kdab.com> | Senior Software Engineer
KDAB (Deutschland) GmbH & Co.KG, a KDAB Group Company
Tel: +49-30-521325470
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