shared_ptr

template <class T> class SmartPointer 
{
public:
    SmartPointer(T * ptr) 
    {
        ref = ptr;
        ref_count = (unsigned*)malloc(sizeof(unsigned));
        *ref_count = 1;
    }

    SmartPointer(SmartPointer<T> & sptr) 
    {
        ref = sptr.ref;
        ref_count = sptr.ref_count;
        ++*ref_count;
    }
    
   SmartPointer<T> & operator=(SmartPointer<T> & sptr) 
   {
       if (this != &sptr)
       {
           ref = sptr.ref;
           ref_count = sptr.ref_count;
           ++*ref_count;
        }
        return *this;
   }
   
   ~SmartPointer() 
   {
       --*ref_count;
       if (*ref_count == 0) 
       {
           delete ref;
           free(ref_count);
           ref = NULL;
           ref_count = NULL;
        }
    }

    T getValue() { return *ref; }

protected:
    T * ref;
    unsigned * ref_count;
};