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_;

};