virtual base classes are special in that they are initialized by the most derived class and not by any intermediate base classes that inherits from the virtual base. Which of the potential multiple initializers would the correct choice for initializing the one base? If the most derived class being constructed does not list it in … Read more
From Wikipedia’s Virtual function … In object-oriented programming, in languages such as C++, and Object Pascal, a virtual function or virtual method is an inheritable and overridable function or method for which dynamic dispatch is facilitated. This concept is an important part of the (runtime) polymorphism portion of object-oriented programming (OOP). In short, a virtual … Read more
“Surely so long as you allocate memory on the heap” – where the memory is allocated has nothing to do with it. It’s all about the semantics. Take, for instance: Derived d; Base* b = &d; d is on the stack (automatic memory), but polymorphism will still work on b. If you don’t have a … Read more
Why can’t I do this and then do : B classb = new B(1,2,3); classb.blah(4); You absolutely can. There’s no problem with that at all, other than the syntactic errors in your code. Here’s a complete example which compiles and runs with no issues. (I’ve fixed the naming convention violation at the same time for … Read more