Macros in C, and template metaprogramming in C++? Some crazy people are writing their software entirely as C++ metaprograms and using the compiler to execute it

Macros in C, and template metaprogramming in C++? Some crazy people are writing their software entirely as C++ metaprograms and using the compiler to execute it. Presumably, the compiler's output is a very short `main` function that just prints the constant value that the compiler calculated. There was an example of this on HN a while ago, where a guy wrote a Game of Life implementation entirely with C++ templates (https://news.ycombinator.com/item?id=8597443 https://news.ycombinator.com/item?id=8597443). Successive generations were nested templates. Compile times became prohibitive after a few generations. The whole thing started to read sort of like Haskell.