#include "BagOp.h"

using namespace std;

int main(void)
{
  Bag b1(5);
  b1.add(10);
  b1.add(150);
  Bag b2;
  b2 = b1;  // use overload =, like saying b2.operator=(b1)

  Bag & b1alias = b1;
  b1alias = b1;    // self assignment - need to be careful

  b2.add(20);
  b2.add(40);
  b2 += b1;

  // prevent this:  (b2 += b1) = Bag(10);
  // don't let return of += be an lvalue

  int n1, n2, n3;
  n1 = n2 = n3 = 10;

  Bag b3(5);
  b3.add(1);
  b3.add(2);
  b3.add(3);

  cout << b3[0] << endl;

  b3[0] = 1000;

  const Bag b4(b2);
  cout << b4[2] << endl;
  //  b4[2] = 13;   compiler error - b4 has read only access
}