[Development] Changing container privates again

[Olivier Goffart]

On Saturday 09 June 2012 19:19:41 Thiago Macieira wrote:
> On sábado, 9 de junho de 2012 19.15.09, Olivier Goffart wrote:
> > I suggest re-ordering the offset in order to avoid padding.
> 
> It doesn't help.
> 
> > struct Q_CORE_EXPORT QArrayData
> > {
> > 
> >     QtPrivate::RefCount ref;
> >     uint flags;
> >     qptrdiff offset; // in bytes from beginning of header
> >     int size;       // ### move to the main class body?
> >     // 4 byte tail padding on 64 bits
> > 
> > };
> > // size is 16 / 24 bytes (but really 20 bytes as we could use the tail
> > padding to put the payload already)
> > 
> > 
> > struct QArrayAllocatedData : public QArrayData
> > {
> > 
> >     uint alloc;
> > 
> > };
> > // size is 20 / 24 bytes  (the tail padding bytes are used)
> 
> The size here is 20 / 32 bytes. The tail padding bytes are not used.

Ah right...   I tought that when inheriting, the padding was used. I was 
mistaken.

Then, one can put back 'alloc' in QArrayData