Can we override a function that is not a function of a class
Overview
In object-oriented programming, we have class, and class has two things member functions or data members.
Function Overriding
Function Overriding is defined as redefining the base class function in a derived class with the same name, parameters, and return type.
In function overriding, the overridden function in the parent class is referred to as the overriding function. The overriding function in the child class is referred to as the overriding function.
Overriding a function that is not a member function of the class
If the function is not a member function of the class, we cannot access that function with the help of class objects.
Note: Only the functions that the derived class inherited from the base class can be overridden.
Let’s understand this concept with the help of a scenario.
If the base class has a public member function, say, myfunc, then we can override the member function myfunc in the’ derived’ class.
But if the base class has a private member function, say, myfunc1, then the derived class cannot override the member function myfunc1.
Example
#include <iostream>using namespace std;class base{private:void myfun1(){cout<<" Parent class private member function "<<endl;}public:void myfun(){cout<<"Parent class public member function"<<endl;}};class derived: public base{public:void myfun(){cout<<"Child class public member function"<<endl;}};int main() {derived dri;// create drived class objectdri.myfun();return 0;}
Explanation
-
Line 3 : We create
baseclass. -
Line 6: We create
privatemember functionmyfunc1. -
Line 12: We create
publicmember functionmyfunc. -
Line 18: We create
drivedclass and inherit it with the base class. -
Line 21: We create
publicmember functionmyfuncand overridden it. -
Lines 29 and 30: We create a
derivedclass object and call itmyfunc.
