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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:

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

  RefCntr() : rep(0), pcount(0) {}

  RefCntr(X *pp) : rep(pp), pcount(new int(1)) {}

  RefCntr(const RefCntr &r) :rep(r.rep), pcount(r.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) == 0) {delete rep;delete pcount;}}

  int getcnt() const {return *pcount;}

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

};





#endif /*_REFCNTR_H_ */