I believe your parent is referring to the Core Guidelines and the Guideline Support Library.
Apple also demoed their XCode integration at WWDC 2019, on the talk about Objective-C, C and C++ support.
https://developer.apple.com/videos/play/wwdc2019/409/
However here is the clang talk I was referring to.
https://www.youtube.com/watch?v=VynWyOIb6Bk