Clearing a QSharedPointer pointed by QSharedPointer and QWeakPointer.

prinzkm

In the following code,

int *pI = new int(9);//memory allocated
QSharedPointer<int> pI1(pI);//shared pointer pointing to pI
QWeakPointer<int> pI2 = pI1;//weak pointer pointing to pI
pI1.clear();

qDebug()<<*pI; //prints 9 - no segmentation fault

qDebug()<<pI2.isNull(); // evaluates to true
qDebug()<<pI1.isNull(); //evaluates to true

why I am able to dereference *pI.Won't shared pointer delete it from heap after pI1.clear()?

sierdzio

It may be deleted, but the data is still there. You're accessing "dead" memory.