it absolutely is. I do a lot of embedded programming, and tmp is used heavily in libraries to offload as much as possible to compile time.

Compile time code generation can be done in many ways.

Again, templates are not a feature that is part of the close-to-the-metal part of C++.

What exactly does template metaprogramming in C++ allow you to do that you could not do in Rust? In the context of performance critical code?

Besides, Rust has generics and macros. The latter are arguable as powerful (if almost as cumbersome to debug) as C++ templates.

See also https://news.ycombinator.com/item?id=16283956