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I wasn't planning on that, no. Is there a good reason to do so?

LOL, here is my C++ implementation of the same concept: https://github.com/os12/calc

I love that you include the BNF-ish grammar. Grammars are so straight-forward to read, I wish my eyes didn't glaze over during those times I've tried to sit down and create one.

What's wrong with Python? Do you find the calculator too slow?