Symbiotic differentiation using recursion for c++.

[dutch]

I'm pretty sure the exponentiation operator (if defined, since we don't actually have one in C++) would usually be right-associative. See second paragraph here: https://en.wikipedia.org/wiki/Operator_associativity#Examples

My main point was that it is easy to handle it by just scanning in reverse.
(see lounge)

[Duthomhas]

Ah, yes, good point. +1