That's also in line with my memory of it.

We still don't have all of the interesting C++ features in freestanding mode. It's still a fairly unknown component of libc++ and libstdc++. I've only been playing with it recently because I was curious about how many of the c++17 and newer compile time features I could get to work in avr-g++.

And the answer is ... not much.

I've been spoiled by Rust's "core" crate.