Final in C++ indicates that the function/class can no longer be overridden in further child classes. This enables devirtualization as the compiler can then know the function pointer will not change, if it can infer the type at compile time.

No. In fact in a few short months post C++11 will have overtaken pre-C++11 as the majority of the 26 year history of standardized C++ (and similar to prior standards, compilers for the fortunate implemented much of the behavior prior to the official publication).