this pointer: Part (B)

2. To return reference to the calling object

/* Reference to the calling object can be returned */ Test& Test::func () {    // Some processing    return *this; }

When a reference to a local object is returned, the returned reference can be used to chain function calls on a single object.

#include<iostream>   class Test { private:   int x;   int y; public:   Test(int x = 0, int y = 0) { this->x = x; this->y = y; }   Test &setX(int a) { x = a; return *this; }   Test &setY(int b) { y = b; return *this; }   void print() { cout << "x = " << x << " y = " << y << endl; } };   int main() {   Test obj1(5, 5);     // Chained function calls.  All calls modify the same object   // as the same object is returned by reference   obj1.setX(10).setY(20);     obj1.print();   return 0; }