I was going to link the same article! I think the interesting part is the similarity between haskell and clojure. Essetially programming to very small classes/

I was going to link the same article! I think the interesting part is the similarity between haskell and clojure. Essetially programming to very small classes/protocols. The linked article is cool, because i think the java approach would generalize to the OP's C++ solution, and be able to eliminate that gross dynamic cast.