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Message: [QUOTE="Ulrich Eckhardt, post: 4176971"] The only thing I haven't found yet is how to check the type of I'd say you really didn't. Anyhow, there are three ways to check the type: 1. As mentioned, use which(). 2. Use boost::get<T>. If T is a reference type or a pointer type, you will get feedback whether it fits similarly to dynamic_cast. 3. Use a visitor. The visitor pattern allows you to supply a functor and the according function there is called. Maybe. ;) You should be able to find all docs online at Boost's, including details to the above three variants. Uli [/QUOTE]