#include <iostream>
#include <vector>
using namespace std;

// Consider an actual class.
class Obj {
   static int i, j;
	
public:
   void f() const { cout << i++ << endl; }
   void g() const { cout << j++ << endl; }
};

// Static member definitions:
int Obj::i = 10;
int Obj::j = 12;

// Implement a container for the above class
class ObjContainer {
   vector<Obj*> a;
public:
   void add(Obj* obj) { 
      a.push_back(obj);  // call vector's standard method.
   }
   friend class SmartPointer;
};

// implement smart pointer to access member of Obj class.
class SmartPointer {
   ObjContainer oc;
   int index;
public:
   SmartPointer(ObjContainer& objc) { 
      oc = objc;
      index = 0;
   }
	
   // Return value indicates end of list:
   bool operator++() // Prefix version { 
      if(index >= oc.a.size()) return false;
      if(oc.a[++index] == 0) return false;
      return true;
   }
	
   bool operator++(int) // Postfix version { 
      return operator++();
   }
	
   // overload operator->
   Obj* operator->() const  {
      if(!oc.a[index]) {
         cout << "Zero value";
         return (Obj*)0;
      }
      return oc.a[index];
   }
};

int main() {
   const int sz = 10;
   Obj o[sz];
   ObjContainer oc;
	
   for(int i = 0; i < sz; i++) {
      oc.add(&o[i]);
   }
	
   SmartPointer sp(oc); // Create an iterator
   do {
      sp->f(); // smart pointer call
      sp->g();
   } while(sp++);
   return 0;
}