goingware writes: In my particular case, I had two class heirarchies. At the top of one class heirarchy was an abstract object editor, and subclasses were particular kinds of object editors. In the other class heirarchy the base was a drawing tool, and the subclasses were particular tools. In my case, only particular subclasses from one heirarchy were meant to operate on particular subclasses in another heirarchy, and I think there you can argue that RTTI is needed.

I assume you mean dynamic_cast and family. You may be surprised to read what Vlissides has to say about that topic, being a direct result of his work on Unidraw. It's a pitty such excellent work hasn't become more popular.