[Qt-interest] QWizardPage::wizard() overprotected?

[Scott Aron Bloom]

Since your deriving from WizardPage anyway.. why not just overload
wizard() and make it public?

That said, why do you need access to  the wizard outside of the
WizardPage?

Scott

> -----Original Message-----
> From: qt-interest-bounces at trolltech.com [mailto:qt-interest-
> bounces at trolltech.com] On Behalf Of Niels Dekker - no return address
> Sent: Thursday, December 11, 2008 1:01 AM
> To: qt-interest at trolltech.com
> Subject: [Qt-interest] QWizardPage::wizard() overprotected?
> 
> When implementing a wizard, I got a compile error, trying to call a
protected
> member function, QWizardPage::wizard(). Which should just get me a
pointer
> back from any wizard page to the wizard itself.  Why isn't it public?
> 
> Anyway, I was so lucky to find a trick to get access to a protected
function,
> in a standard compliant and platform independent way. In an article by
> Alexander Nasonov, Overload (ACCU), December 2005:
> http://accu.org/index.php/journals/296  Hereby I'd like to share my
getWizard
> function with you:
> 
>   /// Returns the wizard associated with the specified page.
>   QWizard* getWizard(const QWizardPage& page)
>   {
>     struct BreakProtection: QWizardPage
>     {
>       static QWizard* getWizard(const QWizardPage& page)
>       {
>         QWizard* (QWizardPage::*memberFunction)() const =
>           &BreakProtection::wizard;
>         return (page.*memberFunction)();
>       }
>     };
>     // Calls the protected wizard() member function.
>     return BreakProtection::getWizard(page);
>   }
> 
> Please don't tell anyone  ;-)
> 
> Kind regards,
> 
>   Niels
> 
> --
> I need to make mistakes just to learn who I am
> And I don't wanna be so damn protected
>   - Britney Spears, Overprotected
> 
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