[Qt-interest] QPointer usage

[Patric]

Ah, yes... 
That's a problem. 

Thank you Prashanth
  ----- Original Message ----- 
  From: Prashanth Udupa 
  To: Patric ; qt-interest at trolltech.com 
  Sent: Sunday, August 30, 2009 3:18 PM
  Subject: Re: [Qt-interest] QPointer usage


  Hi,


  As the documentation says QPointer can only be used with subclasses of QObject, which QString is not.


  HTH.


  / Prashanth





------------------------------------------------------------------------------
  From: Patric <userqt at gmail.com>
  To: qt-interest at trolltech.com
  Sent: Sunday, August 30, 2009 4:35:54 PM
  Subject: [Qt-interest] QPointer usage


  Hello, 
  I'm trying to assign a normal pointer to QPointer instance. But there is an error 

  c:/Qt/2009.03/qt/include/QtCore/../../src/corelib/kernel/qpointer.h: In member function `QPointer<T>& QPointer<T>::operator=(T*) [with T = QString]': 
  main.cpp:16: instantiated from here

  c:/Qt/2009.03/qt/include/QtCore/../../src/corelib/kernel/qpointer.h:68: error: comparison between distinct pointer types `QObject*' and `QString*' lacks a cast

  c:/Qt/2009.03/qt/include/QtCore/../../src/corelib/kernel/qpointer.h:68: error: no matching function for call to `QMetaObject::changeGuard(QObject**, QString*&)'

  c:/Qt/2009.03/qt/include/QtCore/../../src/corelib/kernel/qobjectdefs.h:340: note: candidates are: static void QMetaObject::changeGuard(QObject**, QObject*)



  Here is the code 



  QString *string = new QString();

  QPointer<QString> pointer;

  pointer = string;





  Why it's not working ? 



  Regards, 

  Patric


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20090830/28b360b8/attachment.html