[Qt-interest] Problem with qSort and QObjects

[Thiago Macieira]

Em Domingo 14. Fevereiro 2010, às 16.37.42, Florian VICHOT escreveu:
> Sorry just realised I didn't really answer your second question.
> 
> > 1) What I need to do to get the QObject version working? qSort docs
> > say that the items need to implement operator<(), but clearly that is
> > not enough.
> 
> BTW, using QObject by value is a bad idea. I gave the fix to make it
> work, but it's not a good idea in most cases. If you copy QObject using
> the methods I gave you, it won't copy along signal/slot connections,
> etc, since QObject(const QObject& o) is not called.

The proper solution to this problem is to not use QObject at all.

I see nothing in Carl's Account class that requires a QObject. There are no 
signals, no slots, no properties, it doesn't require the parent-child 
ownership tree.

If you look at it, you notice that it only makes sense to copy the object 
*because* it doesn't require those things. Because if it did require them, the 
copying would shear the information -- and that's why QObject-derived classes 
cannot be copied.

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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