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Friday, May 30, 2008

C++ Object Slicing

 May 30, 2008     CPP     No comments   

What is object slicing?
  • Object slicing is a concept where additional attributes of a derived class object is sliced to form a base class object.
  • Object slicing doesn't occur when pointers or references to objects are passed as function arguments since both the pointers are of the same size.
  • Object slicing will be noticed when pass by value is done for a derived class object for a function accepting base class object.
  • Object slicing could be prevented by making the base class function pure virtual there by

EXAMPLE: Demonstrate the concept of object slicing

#include <iostream>

using namespace std;



class Base {

int data1;

int data2;

public:

Base(int a, int b) {

data1 = a;

data2 = b;

}



virtual void display() {

cout << "I am Base class" << endl;

}

};



class Derived : public Base {

int data3;

public:

Derived(int a, int b, int c) : Base(a, b) {

data3 = c;

}



void display() {

cout << "I am Derived class" << endl;

}

};



void somefunc ( Base obj )

{

obj.display();

}



int main()

{

Base b(10, 20);

Derived d(100, 200, 300);



somefunc(b);

somefunc(d);

}



OUTPUT:

I am Base class

I am Base class

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