CCI_chapter 13C++

13.9Write a smart pointer (smart_ptr) class

?

template<class T>class SmartPoint{

 public:

    SmartPoint(T *ref){

        ref_ = ref;

        count_ = (unsigned int *)malloc(sizeof(unsigned int ));

        *count_ = 1;

    }

    SmartPoint(SmartPoint<T> &sptr){

        ref_ = sptr.ref_;

        count_ = sptr.count_;

        ++(*count_);

    }

    SmartPoint<T>& operator =(SmartPoint<T> &sptr)

    {  

        if(this != sptr){

            ref_ = sptr.ref_;

            count_ = sptr.count_;

            ++(*count_);

        }

        return *this;

    }

    ~SmartPoint()

    {

        --(*count_);

        if(*count_ == 0)

         {

            delete ref_;

            free(count_);

            ref_ = NULL;

            count_ = NULL;

         }

         

    }

    T getValue(){

        rturn *ref_;

    }

 private:

    T* ref_;

    unsigned int *count_;

};