Hi,

The strangest thing...

I'm filling QListWidgetItems with a template type T* p_Object (i've added the Q_DECLARE_METATYPE() macro to the candidate classes for T). Amazingly, it works fine, i was pleasantly surprised: after storing T* as a Qt::UserRole, i immediately read back the data to check, and there are no problems.

But... reading the data back in a later pass (using the same ItemToObject() function), it fails. The QVariant seems ok (has the same id number) but the qVariantValue<T*> "cast" fails. I'm not changing anything in the QListWidgetItems inbetween passes...

Any idea's?

Kind Regards,
Daniel Dekkers

Qt Code: 
  1. template <class T>
  2. void
  3. c_ListViewController<T>::SetItemData(QListWidgetItem* p_Item, T* p_Object)
  4. {
  5. 	p_Item->setData(Qt::DisplayRole, QString::fromStdWString(p_Object->Name()));
  6.  
  7. 	QVariant l_Data;
  8. 	l_Data.setValue(p_Object);
  9. 	p_Item->setData(Qt::UserRole, l_Data);
  10.  
  11. 	// Check...
  12. 	T* l_ReadBackObject = GetItemData(p_Item);
  13. 	if (p_Object!=l_ReadBackObject) 
  14. 	{
  15. 		c_MessageDialog* l_MessageDialog = new c_MessageDialog(this, "Something wrong..."); l_MessageDialog->exec();
  16. 	}
  17. }
  18.  
  19. // =============================================================================
  20.  
  21. template <class T>
  22. T*
  23. c_ListViewController<T>::GetItemData(QListWidgetItem* p_Item) const
  24. {
  25. 	T* l_ReadBackObject = NULL;
  26. 	QVariant l_ReadBackData = p_Item->data(Qt::UserRole);
  27. 	l_ReadBackObject = qVariantValue<T*>(l_ReadBackData);
  28. 	return l_ReadBackObject;
  29. }
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