[panstromek]

> There must be a really good reason for this, such as Rust doesn’t interop well with C++

Yea, I'd bet it's that. Ideally, you'd want to stop writing C++ and continue with Rust on all new code, but Rust has stricter semantics, so the interop is somewhat "easy" in one direction, but very hairy in the other direction.

This means that in practice, you want to start porting from leaf components and slowly grow closer to the root, which stays in C++ for quite some time and just calls into Rust through C API (or something close to it).

If you're curious about the topic, there's a interop library called Zngur (https://hkalbasi.github.io/zngur/), which is built on this assumption. They have a pretty good explanation of the concrete problems on the homepage.