I guess by OS programming I assumed they meant the kernel. Fuchsia is hardly an established OS at the moment so I don't really compare against it, and for Windows, MS's documentation has repeatedly discouraged C++. I'm sure some use C++ in the kernel anyway but I'm not under the impression it's generally accepted.

All the examples I gave, except for Fuchsia, are examples of C++ in production for kernel code.

Windows has been slowly moving into C++ since Windows 8, as Microsoft considers C++ the future of systems programming in Windows.

https://docs.microsoft.com/en-us/cpp/build/reference/kernel-...

https://www.reddit.com/r/cpp/comments/4oruo1/windows_10_code...

Wow that's good to hear, thanks. (I wasn't familiar with the other OSes so that's why I didn't comment on them.)

Here is some information for you, or anyone else, to look into then.

https://os.mbed.com/docs/mbed-os/v5.11/apis/drivers.html

https://developer.apple.com/library/archive/documentation/De...

https://genode.org/documentation/genode-foundations-18-05.pd...

https://www.haiku-os.org/docs/api/

https://source.android.com/devices/architecture

https://source.android.com/devices/architecture/hidl-cpp/ind...

https://www.amazon.com/Symbian-OS-Internals-Real-time-Progra...