Look to the following code, please:

class Node
{
private:
    double x, y;
public:
    Node (double xx, double yy): x(xx), y(yy){}
};

int main()
{
  Node *n1 = new Node(1,1);
  Node *n2 = n1;

  delete n2; 
  n2 = NULL;

  if (n1 != NULL) //Bad test
  {
     delete n1;   //throw an exception
  }
}

There are two pointers n1, n2 pointed to the same object. I would like to detect whether n2 was deleted using n1 pointer test. But this test results in exception.

Is there any way how to determine whether the object was deleted (or was not deleted) using n1 pointer ? Thanks for your help.