[Qt-interest] What is the use of QWeakPointer

[Matthias Pospiech]

I was trying to use QWeakPointer, but I do not see how to use it as a 
replacement for c++ pointers.

First I can not contruct it with a QThread based class:

checkPositionThread(new PiezoJenaControllerCheckPositionThread(this, this))

with

class PiezoJenaControllerCheckPositionThread : public QThread
{
    Q_OBJECT
...

gives the error:
1>.\include\matthias\PiezoJena\PiezoJenaController.cpp(28) : error 
C2664: 'QWeakPointer<T>::QWeakPointer(const QWeakPointer<T> &)': 
Konvertierung des Parameters 1 von 
'PiezoJenaControllerCheckPositionThread *' in 'const QWeakPointer<T> &' 
nicht möglich
1>        with
1>        [
1>            T=PiezoJenaControllerCheckPositionThread
1>        ]
1>        Ursache: Konvertierung von 
'PiezoJenaControllerCheckPositionThread *' in 'const QWeakPointer<T>' 
nicht möglich
1>        with
1>        [
1>            T=PiezoJenaControllerCheckPositionThread
1>        ]
1>        Quelltyp konnte von keinem Konstruktor angenommen werden, oder 
die Überladungsauflösung des Konstruktors ist mehrdeutig

And further it has not -> Operator so that I can not access the pointer 
as if it was a normal pointer. This especially is a point that I do not 
understand.
How shall I use a pointer class if I can not use the pointer in the way 
pointers are accessed normaly?

Basically I have now switched back to c/c++ pointers until I understand 
how this smart pointer or any other smart pointer is supposed to be used.
Maybe anyone can help me out with further information or an basic example?

Matthias