[Interest] QVector / std::vector and memory alignment

[Philippe]

Good to know. It would be nice to have this mentionned in the official documentation.

Sometimes there are discussions about what is best QVector vs
std::vector, and here we have a good "plus" for QVector.

Philippe

On Thu, 29 Dec 2016 01:26:33 -0200
Thiago Macieira <thiago.macieira at intel.com> wrote:

> Em quarta-feira, 28 de dezembro de 2016, às 17:34:37 BRST, Philippe escreveu:
> > Given an aligned type such as:
> > 
> > struct alignas(2048) foo
> > {
> >     char t[55];
> > };
> > 
> > I was pleasantly surprised that QVector<foo> provides aligned data (see my
> > example further, using Qt 5.8 RC) I could not see this officially
> > mentionned in the Qt documentation. Yet, this is obviously very useful.
> > Hence, is it a documentation omission, or "an implementation detail we
> > can't rely on" ?
> 
> Yes. It's intentional and works properly for all Qt containers, save 
> QLinkedList (because it uses "new") and QVarLengthArray (because you should 
> revise your code instead).
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
> 
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