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_;
};