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https://github.com/knome/metabrainfuck/blob/master/bf.cpp

It's not too bad :)

As a code golfer, this is beyond satisfying. Doing things in a few bytes is nice, yes, but doing them in a way no reasonable mortal ever would is even better.

There is the lisp meme “mom can we have defmacro? No we have defmacro at home”

The post is actually about template metaprogramming. 'template macroprogramming' isn't really a thing.

Yes, the purpose of C++ templates (not macros, macros are C preprocessor) is to implement generic classes and functions, not to implement arbitrary computation, and (iirc) it was only discovered after their publication that they are in fact Turing-complete.

C++ templates can also take other C++ templates (the template itself, not just an instantiation), enum values and I think in C++23 maybe even structs but I need to check

C++20 added the ability to take class instances as non-type parameters but the rules around the types of classes that can be used in this way are pretty restrictive (for good reason).