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a/src/utils/refcntr.h |
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b/src/utils/refcntr.h |
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#ifndef _REFCNTR_H_
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#ifndef _REFCNTR_H_
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#define _REFCNTR_H_
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#define _REFCNTR_H_
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// See Stroustrup C++ 3rd ed, p. 783
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// See Stroustrup C++ 3rd ed, p. 783
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template <class X> class RefCntr {
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template <class X> class RefCntr {
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X *rep;
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X *rep;
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int *pcount;
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int *pcount;
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public:
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public:
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X * operator->() {return rep;}
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RefCntr()
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: rep(0), pcount(0)
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{}
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RefCntr(X *pp)
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RefCntr() : rep(0), pcount(new int(1)) {}
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: rep(pp), pcount(new int(1))
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RefCntr(X *pp) : rep(pp), pcount(new int(1)) {}
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{}
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RefCntr(const RefCntr &r) :rep(r.rep), pcount(r.pcount) { (*pcount)++;}
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RefCntr& operator=(const RefCntr& r) {
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RefCntr(const RefCntr &r)
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if (rep == r.rep) return *this;
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: rep(r.rep), pcount(r.pcount)
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if (pcount && --(*pcount) == 0) {
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{
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delete rep;
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if (pcount)
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delete pcount;
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(*pcount)++;
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}
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}
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rep = r.rep;
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RefCntr& operator=(const RefCntr& r)
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pcount = r.pcount;
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{
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if (pcount)
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if (rep == r.rep)
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(*pcount)++;
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return *this;
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return *this;
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if (pcount && --(*pcount) == 0) {
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delete rep;
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delete pcount;
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}
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rep = r.rep;
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pcount = r.pcount;
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if (pcount)
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(*pcount)++;
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return *this;
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}
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}
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~RefCntr() {if (--(*pcount) == 0) {delete rep;delete pcount;}}
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~RefCntr()
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{
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if (pcount && --(*pcount) == 0) {
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delete rep;
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delete pcount;
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}
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}
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X *operator->() {return rep;}
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int getcnt() const {return *pcount;}
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int getcnt() const {return pcount ? *pcount : 0;}
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const X * getptr() const {return rep;}
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const X *getptr() const {return rep;}
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};
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};
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#endif /*_REFCNTR_H_ */
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#endif /*_REFCNTR_H_ */
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