On Fri, May 6, 2016 at 8:35 AM, Tom Isaacson <tom.isaac...@navico.com> wrote:
> I'm moving some Qt4.8.2 code which uses QWeakPointer to Qt5.6. > Simplifying a lot it looks like this: > [snippet ..] > but when I compile under Visual Studio 2013 I get this error: > error C2664: 'QWeakPointer<MyClass>::QWeakPointer(const QSharedPointer<T> > &)' : cannot convert argument 1 from 'MySettings *' to 'const > QWeakPointer<MySettings> &' Is there a recommended method for migrating the use of QWeakPointer into > Qt5? > Yes, by actually using a QSharedPointer for the constructor (as QWeakPointer is a weak reference to a shared pointer). > I tried changing the QWeakPointer to a QPointer but now I'm getting: > error C2440: 'static_cast' : cannot convert from 'QObject *' to MyClass *' > (GeneratedFiles\Debug\moc_MyCode.cpp) > Well you can't have implicit upcasting, so you should manually qobject_cast to the derivied class, but this error doesn't really correspond to your snippet. The pointer you have is referencing MySettings, not MyClass. Kind regards, Konstantin.
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