C Virtual Keyword In Derived Classes

The virtual keyword is not necessary in the derived class. Name parameter type list but not the return type cv qualifiers ref qualifiers then this function in the class derived is also virtual whether or not the keyword virtual is used in its.

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Virtual functions are used to achieve runtime polymorphism.

C virtual keyword in derived classes. A virtual function is a member function which is declared within a base class and is re defined overriden by a derived class. Any class type whether declared with class key class or struct may be declared as derived from one or more base classes which in turn may be derived from their own base classes forming an inheritance hierarchy. Followed by a comma separated list of one or.

2 if a virtual member function vf is declared in a class base and in a class derived derived directly or indirectly from base a member function vf with the same name parameter type list 8 3 5 cv qualification and ref. Rules of virtual keyword in c. When you refer to a derived class object using a pointer or a reference to the base class you can call a virtual function for that object and execute the derived class s version of the function.

Advantages of virtual keyword in c. The virtual keyword in c use in the function declaration. If a class is derived from a class having a virtual function then the function definition can be redefined in the derived class.

Virtual functions in derived classes in c once a member function is declared as a virtual function in a base class it becomes virtual in every class derived from that base class. Here s the supporting documentation from the c draft standard n3337 emphasis mine. If some member function vf is declared as virtual in a class base and some class derived which is derived directly or indirectly from base has a declaration for member function with the same.

The list of base classes is provided in the base clause of the class declaration syntax the base clause consists of the character. In other words it is not necessary to use the keyword virtual in the derived class while declaring redefined versions of the virtual base class function.

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