[b6936d]: src / utils / refcntr.h History

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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) 

    {}

    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;

    }

    ~RefCntr() 

    {

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

	    delete rep; 

	    delete pcount; 

	}

    }

    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;}

};





#endif /*_REFCNTR_H_ */