[Digikam-devel] Re: delete does not reset the pointer in GCC (4.6.0)

[Marcel Wiesweg]

> > Right, we are still using too many raw pointers.
> > Qt, C++ stdlib and boost have many things to handle pointers
> > automatically.
> 
> Yes. this one is exactly that we need :
> 
> http://doc.qt.nokia.com/4.7/qpointer.html

QPointer is good for QObject pointers, but works only with them

Where applicable, "value" classes can be built around implicit sharing 
(QSharedDataPointer), like DImageHistory recently. It's some lines extra but 
100% safe to crashes if the class itself checks for 0. Of course, there is 
overhead for the extra allocation, but almost all Qt value classes are built 
around this pattern, beginning with QString or QByteArray.