[Development] Upgrading the sources to C++11 keywords (Q_NULLPTR, etc.)

[Thiago Macieira]

On Monday 02 February 2015 14:29:21 Matthew Woehlke wrote:
> >  * Q_DECL_EQ_DEFAULT - really discouraged
> > 
> >
> > I can't think of any case where you could use this and let the code still 
> > compile in C++98, so don't use it
> 
> I'd actually like to see this used where possible and sensible, as the
> compiler may be able to optimize better (or it can make POD types that
> otherwise wouldn't be POD).
> 
> You can use it like:
> 
>   class QFoo { QFoo(const QFoo&) Q_DECL_EQ_DEFAULT; }
>   #if // '= default' not supported
>   QFoo::QFoo(const QFoo& other) { ... }
>   #endif
> 
> ...that is, provide a definition conditional on Q_DECL_EQ_DEFAULT
> expanding to empty. (This will also make it easy to rip out the old code
> if/when C++11 becomes a requirement for Qt.)

This class is better written as:

class QFoo
{
    // implicit copy constructor is fine
};

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center