[foonathan]

Post author here. To be fair, we specifically don't use std::ranges because of that "N Pythagorean triple" problem. We have our own custom library that is vastly superior to std::ranges. See e.g. here for context: https://www.youtube.com/watch?v=l7ntC-Y1syY

I was recently appointed co-chair for the std::ranges group and I'm trying to bring some of the improvements to C++.