C++ this Pointer

C++ has a keyword called this, which is used to represent the address of object. An object can access its own address through this pointer. When a member function is called, this pointer is automatically passed to the member function. The this pointer is implicit arguments to all member functions. But the this pointer is not implicit argument to friend function, because friend function is not member function. 

Examples of this pointer in c++

#include<iostream>

using namespace std;

class Example

{

public:

    int a, b;

public:

    void setValue(int a, int b)

    {

        this->a = a;

        this->b = b;

    }

    void swapping()

    {

        Example temp;

        temp.a = this->a;

        this->a = this->b;

        this->b = temp.a;

    }

    void showValue()

    {

        cout<<"a = "<<this->a<<"\nb = "<<this->b;

    }

};

int main()

{

    Example obj;

    obj.setValue(5, 8);

    obj.swapping();

    obj.showValue();

    return 0;

}

OUTPUT:

a = 8

b = 5

The this pointer can be used when both local variable name and member arguments name are same.