Thanks for sharing this. I am always fascinated by projects that use C++ for low-level or OS stuff and some how, I've never come across this project.
running on seL4, which is arguably one of the great achievements in verified software, it's so conceptually interesting!
{ A subset of the C++17 language is used in the Zircon tree. This includes both the kernel and userspace code. C++ is mixed with C (and some assembly) in both places. Some C++ language features are avoided or prohibited. Use of the C++ standard library features is very circumspect.}
[0] https://fuchsia.dev/fuchsia-src/development/languages/c-cpp/...
"Raspberry Pi Pico with C++OS: Coroutines and std::execution in Embedded Systems"