[Qt-interest] What is the use of QWeakPointer

[Thiago Macieira]

Em Sexta-feira 09 Abril 2010, às 12:02:02, Dan Milburn escreveu:
> QWeakPointer<MyObject> weakPointer = ...
> MyObject *o = weakPointer.data();
> if( o )
> {
>     // Do something with o
> }
> 
> Obviously this would cause problems in a multi-threaded environment, but 
> then I don't think QWeakPointer is suitable for that.

The "proper" way is:

QSharedPointer<MyObject> sp = weakPointer;
if ( sp ) {
    // do something with the shared pointer
    // and it won't get deleted
}

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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