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Do you use any kind of library or typical design pattern for your FSM implementation? When I've used them, I typically always go back to very C-like code (enum for the states, a state variable, and a big switch statement inside a loop).

We don't represent automata as a code, that leads to compiler errors etc., we represent them as graphs, just as data.

Inside the code we use: state --> int set of states --> sorted / unique'd array of int's input symbol --> int output symbol --> int transition function is abstracted out behind an interface and implemented differently based on whether automaton is read-only or changeable and based on the state etc.

I'm going to have to think about that a bit. Maybe I'm missing the point, but it sounds like an interpreter. Thanks for posting the code. This feels like something I need to understand.

Thanks - will dive in and start checking things out.

What is lean C++?

I think he just means efficient C++ programming.

#define WIN32_LEAN_AND_MEAN

Maybe ?