examples_from_lect3: shared_ptr.h

#ifndef _SHAREDPTR_H_
#define _SHAREDPTR_H_

#include "GaussNumber.h"
#define NULL 0

class Storage {

private:
        GaussNumber *p_obj;
        int count;

public:
        Storage(GaussNumber *p_obj);
        ~Storage();
        void increaseCount();
        void decreaseCount();
        GaussNumber *ptr() const;
        bool isNull() const;

};


class shared_ptr {

private:
        Storage *storage;

public:
        shared_ptr();
        shared_ptr(GaussNumber *p_obj);
        shared_ptr(const shared_ptr &sptr);
        ~shared_ptr();
        const shared_ptr &operator=(const shared_ptr &sptr);
        GaussNumber &operator*() const;
        GaussNumber *operator->() const;
        GaussNumber *ptr() const;
        bool isNull() const;

};

#endif