[Qt5-feedback] Real 64 Bit support ?

[André Pönitz]

On Thursday 12 May 2011 16:58:23 ext Andre Somers wrote:
> Op Do, 12 mei, 2011 4:39 pm, schreef André Pönitz:
> > On Thursday 12 May 2011 16:09:33 ext Andre Somers wrote:
> >> > [And yes, the proposed change breaks sources, albeit in a minor way.
> >> > Introducing the second template argument would trigger a change to
> >> > three lines in the Creator source code (forward declarations of
> >> QList)]
> >> Does it really? If you have a default for the second parameter that is
> >> equal to the current value, I don't think there is a source
> >> incompatibility introduced?
> >
> > You cannot redeclare with different number of parameters
> > and you cannot even have two declaration with giving (even
> > the same!) default parameter twice.
> >
> > Andre'
> >
> Perhaps I misunderstand you. Cannot you do this?
> 
> template <class T, class IndexType = int> class QList {}?

The "user code" in question is:

// Foo.h

template <typename T> class QList;
void bla(const QList<int> &list); 

// Foo.cpp

#include "Foo.h"
#include <QList>


That does not compile with

   template <class T, class IndexType = int> class QList {}

and the only practical solution would be to drop the forward
declaration and use  #include <QList> in Foo.h .

It's not a big change, but it _is_ a change.

Andre'