// Another simple example of shared_ptr (not directly related to the previous examples). 

#include <memory>
#include <iostream>
#include <string>
#include "point.h"

using namespace std;

int f(){
  shared_ptr<Point> pp1{new Point{1,2}},
                    pp2{new Point{3,4}},
                    pp3;

  cout << *pp1 << endl;    // (1,2)
  cout << *pp2 << endl;    // (3,4)

  pp1.reset();             // empty pp1 - delete underlying point (1,2) from the heap.

  pp3 = pp2;               // both pp3 and pp2 refer to (3,4).
  pp3->displace(1,1);      // displace point pointed to by pp3

  cout << *pp2 << endl;    // (4,5) - Point pointed to by pp2 has moved!

  cout << "Exit f" << endl;  
                           // Delete the other point (3,4) from the heap.
                           // Thus both points have disappeared from the heap at this time.
}

int main(){
  f();
  cout << "After f()" << endl;
  // All points on the heap have been released at this point.
}