[Development] Meaning of Q_PRIMITIVE_TYPE?

[Olivier Goffart]

On Friday 30 March 2012 15:35:40 Thiago Macieira wrote:
> On sexta-feira, 30 de março de 2012 18.41.46, Olivier Goffart wrote:
> > On Friday 30 March 2012 12:23:59 Thiago Macieira wrote:
> > > Use of QVarLengthArray should *only* be done with primitive types, the
> > > fixes applied to it during Qt 4.x lifetime notwithstanding. So the user
> > > must know that before he uses that class. If he's not sure, use QVector.
> > 
> > That is wrong.  QVarLenghtArray can be use with every types.
> 
> That statement ^^^
> 
> > > Also, QVarLengthArray should zero-initialise, but it doesn't.
> > 
> > It is documented not to.
> 
> And this statement ^^^
> 
> Are in contradiction. If it doesn't zero-initialise, then it doesn't
> initialise. Then using it for non-PODs is dangerous.
> 
> If it supports any type, then it must initialise them all.


It initialize the types that are not marked as Q_PRIMITIVE_TYPE.
The documentation even says that it is only primitive types that are not 
initialized

> 
> > But yes, it probably should.  (we can add a Qt::Uninitialized overload if
> > we need it)
> 
> I'd rather we removed support for non-primitives. The class wasn't designed
> for that.

It was designed for that, and works well.