Under gcc:
Qt Code: 
  1. #include <QtGui>
  2. #include <QtCore>
  3.  
  4. class test
  5. {
  6. public:
  7.     test()
  8.     :   list( QList<QGraphicsLineItem>() )
  9.     {   }
  10.  
  11. private:
  12.     QList<QGraphicsLineItem> list;
  13. };
  14.  
  15. int main(int argc, char *argv[])
  16. {
  17.     QApplication app(argc, argv);
  18.  
  19.     test t;
  20.  
  21.     return app.exec();
  22. }
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returns:
Qt Code: 
  1. In file included from ..\Qt\include/QtCore/qlist.h:1,
  2.                  from ..\Qt\include/QtCore/../../src/corelib/kernel/qobject.h:50,
  3.                  from ..\Qt\include/QtCore/qobject.h:1,
  4.                  from ..\Qt\include/QtCore/../../src/corelib/io/qiodevice.h:46,
  5.                  from ..\Qt\include/QtCore/qiodevice.h:1,
  6.                  from ..\Qt\include/QtCore/../../src/corelib/xml/qxmlstream.h:45,
  7.                  from ..\Qt\include/QtCore/qxmlstream.h:1,
  8.                  from ..\Qt\include/QtCore/QtCore:3,
  9.                  from ..\Qt\include\QtGui/QtGui:3,
  10.                  from main.cpp:1:
  11. ..\Qt\include/QtGui/../../src/gui/graphicsview/qgraphicsitem.h: In member function 'void QList<T>::node_copy(QList<T>::Node*, QList<T>::Node*, QList<T>::Node*) [with T = QGraphicsLineItem]':
  12. ..\Qt\include/QtCore/../../src/corelib/tools/qlist.h:606:   instantiated from 'void QList<T>::detach_helper() [with T = QGraphicsLineItem]'
  13. ..\Qt\include/QtCore/../../src/corelib/tools/qlist.h:114:   instantiated from 'QList<T>::QList(const QList<T>&) [with T = QGraphicsLineItem]'
  14. main.cpp:8:   instantiated from here
  15. ..\Qt\include/QtGui/../../src/gui/graphicsview/qgraphicsitem.h:865: error: 'QGraphicsLineItem::QGraphicsLineItem(const QGraphicsLineItem&)' is private
  16. ..\Qt\include/QtCore/../../src/corelib/tools/qlist.h:370: error: within this context
  17. ..\Qt\include/QtGui/../../src/gui/graphicsview/qgraphicsitem.h:865: error: 'QGraphicsLineItem::QGraphicsLineItem(const QGraphicsLineItem&)' is private
  18. ..\Qt\include/QtCore/../../src/corelib/tools/qlist.h:383: error: within this context
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Doing the same thing, but replacing QGraphicsLineItem with int or anything else works... I'm at a loss