> > Where "sphere" is a pointer to an existing Sphere? > > "typeid" replaces getCLassIndex? > Ah, no... it must be the class "Sphere" itself obviously? > Is there really nothing like classIndex now? Just curious. There still is getClassIndex(), but it is more complicated and possibly slower: you need to get index of sphere first, remember it somewhere etc. typeid is standard operator, which accepts type or object. Therefore you can test if(typeid(*b->shape)==typeid(Sphere)); the disadvantage is that (unlike dynamic_cast), it will be false for Shapes derived from Sphere, which is not so much concern, I think; getClassIndex() would fail there, too.
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