I did a code that uses custom literals to allow indexing arrays with ordinals (1st, 2nd, 3rd), all at compile time. Additionally _st works only with 1, _nd only with 2, _rd only with 3. Zero and negative numbers are also not supported and fail compilation.
https://github.com/serpent7776/bits/blob/master/th.cpp/th.cpp
1 point
The point of your question seems to be “never try things a for fun”
Curmudgeonry sucks all the joy out of anything.
3 points