swap in c++

gistfile1.txt

/ swap algorithm example
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

class CRectangle {
    int x, y;
  public:
    void set_values (int,int);
    int area () {return (x*y);}
};

void CRectangle::set_values (int a, int b) {
  x = a;
  y = b;
}

void doTheSwap(CRectangle *x, CRectangle * y){
  CRectangle *a = x;
  CRectangle *b = y;
  swap(a, b);
}

int main () {

  CRectangle small, large;
  
  small.set_values(1,1);
  large.set_values(10, 10);
  
  CRectangle *smallptr, *largeptr;

  smallptr = &small;
  largeptr = &large;

  cout << small.area();
  cout << " " << large.area();
  cout << endl;
  
  swap(small, large);
  
  cout << smallptr->area();
  cout << " " << largeptr->area();
  cout << endl;

  return 0;
}