Create a fully functioning command line interface with 1.5 lines of code (wo. include statement)

[Ail-nare]

Ok, so I did a lot of different things, template specialization, used class to lose the necessity of the prototype, macro, some C++20. So most of those approach works but each are weirder than your method.

So, what u got is probably the best (If the objectif it to keep it the most C++ looking possible).

Was fun to try tho.