chaos-pp

It actually would! There are a handful of base-10 arbitrary precision arithmetic implementations in the preprocessor[1], and modern continuation-passing style macro metaprogramming[2] makes it straightforward to write a function like factorial once you get the syntax and semantics down. Libraries like Boost.Preprocessor can’t be taken as an example of “cutting edge” preprocessor metaprogramming. It set a very low bar, and IMO has stifled a lot of developer creativity. [1] https://github.com/rofl0r/chaos-pp/tree/master/chaos/preproc... [2] https://github.com/rofl0r/order-pp/blob/master/example/fibon...

Yes. https://github.com/rofl0r/chaos-pp

> It it technically possible in that C macros are supposedly Turing complete It isn't Turing complete, because it will always terminate, but you can make the execution time (number of execution steps) arbitrary large exponential in respect to the number of source lines. There are a few libraries that implement that. https://github.com/rofl0r/chaos-pp: Quite high level implementation, that supports arbitrary precision decimal base arithmetic. https://github.com/camel-cdr/boline: Mine implements 8/16/32/64 bit arithmetic, and low level control flow. You can very often get away with using unary numbers and/or constant expressions to work around the limitations without needing a library. Got any problem in mind? I've got some time on my hands to problem solve.

That (define macros, include file that uses them) is fairly vanilla usage of the C preprocessor. Abuse is something like this: https://github.com/rofl0r/chaos-pp and https://github.com/rofl0r/order-pp