Anyone know of a simple c++ library that can do boolean operations? Or if there is some website that has code to copy/paste? I see there might be a couple options but curious if anyone has one they use.

You may have misunderstood, by simple I meant a small library that I can provide simple inputs and get outputs, not including and entire game engine worth of code just to use some mesh booleans. I haven't had time to implement the code but these were the ones I found:

https://web.archive.org/web/20110720075903/http://www.complex-a5.ru/polyboolean/comp.html