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		QList<QGraphicsItem*>::iterator it = m_scene->items().begin();
		bool _b = false;
		for (; it != m_scene->items().end(); ++it) {
			_b = !_b;
			QGraphicsItem* _item = *it;
			Chip* _chip = dynamic_cast<Chip*>(_item);
//			Chip* _chip = static_cast<Chip*>(_item);
			if(_b)
				_chip->changeColor();
			else
				_chip->restoreColor();
		}

void Chip::changeColor()
{
	m_even = true;
}

void Chip::changeColor()
{
	m_even = true;
}

class CustomItem : public QGraphicsItem
 {
    ...
    [b]enum { Type = UserType + 1 };[/b]

    [b]int [/b]type() const
    {
        // Enable the use of qgraphicsitem_cast with this item.
        return Type;
    }
    ...
 };

undefined reference to vtable

QGraphicsItem* _item = *it;
Chip* _chip = qobject_cast<Chip*>(_item);

		QList<QGraphicsItem*> _all;
		_all = m_scene->items();
		foreach (QGraphicsItem *item, _all) {
			Chip* _chip = qgraphicsitem_cast<Chip*>(item);
			if (_chip){
				_chip->changeColor();
			}
		}

QList<QGraphicsItem*> theList = m_scene->items();
QList<QGraphicsItem*>::iterator it = theList.begin();