[Qt-interest] [qt4.5-rc1] QVariant(void*) made private

[Jeff Schiller]

Hi J-P,

Thanks for responding!

On 2/15/09, J-P Nurmi <jpnurmi at gmail.com> wrote:
> On Sun, Feb 15, 2009 at 5:33 PM, Jeff Schiller <codedread at gmail.com> wrote:
> > I had the following code which worked fine in Qt 4.5 TP1 and Beta:
> >
> > SomeClass* somePersistentObject = ...;
> > QAction* theAction = ...;
> >
> > theAction->setData(somePersistentObject);
> >
> > However, now that becomes an error in Qt RC1 because QVariant(void*)
> > has been made private.
> >
> > What's the right way to pass an arbitrary pointer into a QVariant?
>
> Actually it was using the implicit QVariant(bool) constructor. The private
> constructor was added to prevent this undesired behavior. You can still use
> QVariant::fromValue().

When I tried this, I received additional compiler errors stating that
my SomeClass was not registered as a metatype.  I'm quite confused
about metatypes, so a simple example would be great!

>
> >
> >
> > Also, what's the reason that mingw was added to the Qt 4.5 release?
> >
> >
>
> Sorry, what do you mean?
>

When deploying an app using the Qt 4.5 Beta, I only needed to include
QtCore4.dll, QtGui4.dll, ... However, when I installed the Qt 4.5 RC1,
launching the app in Windows it complained that the mingw10.dll could
not be found (I included this DLL in my deployment package, but I'm
curious about what's going on).

Thanks again,
Jeff