Other than HaikuOS, I can't think of any other real-world kernel written in C++....

aidenn0 · on March 14, 2018

While the kernel is C, I believe that most of the windows OS is written in C++.

oscargrouch · on March 14, 2018

The new Zircon kernel now from Google fuchsia is being coded in C++ with some C interface for user program.

Giving the great design it have and the leverage of Google on mobile phones, it will probably get a massive deployment in the future.

saagarjha · on March 14, 2018

XNU is basically all C, with a bit of C++ for IOKit if I remember correctly.