Modern C++ Programming Cookbook

How to do it...

To ensure correct declaration of virtual methods both in base and derived classes, but also increase readability, do the following:

• Always use the virtual keyword when declaring virtual functions in derived classes that are supposed to override virtual functions from a base class, and
• Always use the override special identifier after the declarator part of a virtual function declaration or definition.

        class Base         {           virtual void foo() = 0;          virtual void bar() {}           virtual void foobar() = 0;         };        void Base::foobar() {}        class Derived1 : public Base         {           virtual void foo() override = 0;          virtual void bar() override {}          virtual void foobar() override {}         };         class Derived2 : public Derived1         {           virtual void foo() override {}  };  ...