On Thursday, 23 May 2013 19:04:53 CEST, Constantin Makshin wrote: > There's also qgraphicsitem_cast made specifically for casting to classes > derived from QGraphicsItem.
It is also of very limited value in real world because it does not support inheritance -- it can only cast to the exact type of the item in question. Suppose you have a hierarchy -- C derives from B which derives from A. A dynamic_cast of a C to all of B and A will succeed, but a qgraphicsitem_cast will return a null pointer when casting a C* into either B* or C*, only succeeding when casting to A*. Depending on what you're looking for, being able to fully utilize the inheritance tree might or might not be important for you. (Actually, the bits above are a little bit simplified; the casting is performed based on the target class' Type member, so in cases where you e.g. derive from a QGraphicsItemText but forget to provide your own Type value, a cast to QGraphicsItemText will succeed. Of course, you cannot distinguish between a QGraphicsItemText and your own class via qgraphicsitem_cast in this situation.) Cheers, Jan -- Trojitá, a fast Qt IMAP e-mail client -- http://trojita.flaska.net/ _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
