What is 'v' in vtable?

What does v indicate in vtabl开发者_如何学Goe or vptr

The 'v' stands for 'Virtual'.

The vtable is a common method by which virtual function calls are implemented. It contains pointers to a particular class instantiation's versions of any virtual functions that class implements. When you call a virtual function, the compiler will create code that loads it address from the vtable, and branches to that address.