[mikeash]

I believe the correct terminology for C++ would be "member function", and specifically "non-virtual member function" for the ones that actually work with NULL. I also wouldn't be surprised if using a non-virtual member function with NULL is actually undefined behavior that just happens to work with popular compilers, although I'm too lazy to look up the standard to see.

"Class method" is usually used to refer to methods that class objects have themselves, as opposed to an "instance method", which is a method that instances of a class possess. C++ doesn't have class objects or class methods.