[Development] Changing qreal to a float

[André Somers]

Op 21-2-2012 9:35, Thiago Macieira schreef:
> On terça-feira, 21 de fevereiro de 2012 08.24.52, Samuel Rødal wrote:
>> Also, I guess we'll want convenience functions "QRectD QRectF::toRectD()
>> const" etc. Can that be done with the typedefs proposed above, or does
>> it require having "QRectD QRectD::toRectD() const" as well?
> With some template magic it can be done.
>
> If you write:
> template<class t>  class QBasicRect;
> typedef QBasicRect<float>  QRectF;
> typedef QBasicRect<double>  QRectD;
>
> Then you can't specialise QBasicRect<float or double>  anymore. You can only use
> the default expansion or partial specialisations that are yet to be written.
> That means it's easier to add an "constexpr inline QRectD toRectD() const;" to
> all classes than to just the float and integer ones.
>
> But someone really motivated can add more magic using QEnableIf.
>
Just wondering: while I think using templates for these classes is a 
good idea in principle, will using such template magic as you are 
suggesting here hurt compilation times, both of Qt itself and Qt 
applications using these classes?

André