One of the few things I was truly amazed by when doing some C++ courses during university. Contrived OOP or extremely cumbersome string manipulation wasn't real

One of the few things I was truly amazed by when doing some C++ courses during university. Contrived OOP or extremely cumbersome string manipulation wasn't really my thing. But being able to have compile time evaluation of pretty complicated functions without using macros or anything was so cool. Actually thought about wanting it yesterday in Go