9 RefCount() : nref(0) {}
12 int nrefs() const { return nref; }
23 class A : public RefCount {
42 RefA(A* a) : p(a) { if (p) p->reference(); }
43 RefA(const RefA& a) : p(a.p) { if (p) p->reference(); }
46 A* operator->() { return p; }
48 RefA& operator=(const RefA& a) {
56 RefA& operator=(A* a) {
70 AccRefA(A* ap) : a(ap) {}
71 AccRefA(const RefA& ar) : a(ar) {}
74 operator RefA&() { return a; }
75 RefA& result() { return a; }