#include <iostream>
#include <vector>
using namespace std;
//Use pointers to avoid a copy


class student
{
	public:
	 int id  ;
	 student( int idP )
	  {
		  id = idP ;
		  cout << "Constructor called for  ;" << id << endl ;
	  }
	 student( const student& obj1 )
	  {
		  id = obj1.id ;
		  cout << "Copy Constructor called for  ;" << id << endl ;
	  }

	 ~student(  )
	  {
		  cout << "Destructor called for  ;" << id << endl ;
	  }

};



int main()
{

   // create a vector to store int
   vector<student*> vec;
   int i1;
   //student studentObj( 1 ) ;
   student* ptr ;
   ptr = new student( 1 ) ;

   // display the original size of vec
   cout << "vector size = " << vec.size() << endl;

   // push 5 values into the vector
   vec.push_back( ptr );


   // display extended size of vec
   cout << "extended vector size = " << vec.size() << endl;

   // access 5 values from the vector
      cout << "value of vec [" << 0 << "] = " << vec[0]->id << endl;


   // use iterator to access the values
   delete ptr ;

   //Using the vector after the object has been deleted.
   cout << "value of vec [" << 0 << "] = " << vec[0]->id << endl;

   return 0;
}