He seems to be talking about some specific type of C++ programming. Starting in the mid-2000s, C++ started feeling like a different language at each company I

He seems to be talking about some specific type of C++ programming. Starting in the mid-2000s, C++ started feeling like a different language at each company I worked at. Different libraries allowed, c-style versus STL coding, even completely different ideas about how classes should be written. I looked at some recent language proposals and didn't even understand what the code was doing. Saying "I know C++" is too vague and almost certainly incorrect.