Check out this deep learning stuff people talk about. Torch is written in C++ using plenty CUDA (which is arguably a dialect of C++), and deals with all the resource management and hardware interfacing. People use python then interfacing with it.

I don’t particular like how torch is designed and written, but that’s a different story. TensorFlow is c++ as well, in case you wondered.

But maybe that all does not match your requirements for system programming? Try Haiku, at least back when it was BeOS I really liked that the whole OS was written in C++. I have a colleague who wrote some microcontroller code in C++ because he likes it so much and I don’t think there’s anything wrong with that either.