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#ifndef _REFCNTR_H_

#define _REFCNTR_H_



// See Stroustrup C++ 3rd ed, p. 783

template <class X> class RefCntr {

    X   *rep;

    int *pcount;

public:

    RefCntr() 

        : rep(0), pcount(0) 

    {}

    explicit RefCntr(X *pp) 

        : rep(pp), pcount(new int(1)) 

    {}

    RefCntr(const RefCntr &r) 

        : rep(r.rep), pcount(r.pcount) 

    { 

        if (pcount)

            (*pcount)++;

    }

    RefCntr& operator=(const RefCntr& r) 

    {

        if (rep == r.rep) 

            return *this;

        if (pcount && --(*pcount) == 0) {

            delete rep;

            delete pcount;

        }

        rep = r.rep;

        pcount = r.pcount;

        if (pcount)

            (*pcount)++;

        return  *this;

    }

    void release()

    {

        if (pcount && --(*pcount) == 0) {

            delete rep;

            delete pcount;

        }

        rep = 0;

        pcount = 0;

    }

    ~RefCntr() 

    {

        release();

    }

    X *operator->() {return rep;}

    X *getptr() const {return rep;}

    const X *getconstptr() const {return rep;}

    int getcnt() const {return pcount ? *pcount : 0;}

    bool isNull() const {return rep == 0;}

    bool isNotNull() const {return rep != 0;}

};





#endif /*_REFCNTR_H_ */