112   T* get() const { return value_; }  in get()
113   T* operator->() const { return value_; }
114   T& operator*() const { return *value_; }
120     T* v = value_;  in release()
121     value_ = NULL;  in release()
125   bool operator==(const T* p) const { return value_ == p; }
126   bool operator!=(const T* p) const { return value_ != p; }
129     return value_ == ptr.get();
133     return value_ != ptr.get();
140   T* value_;  variable
144     if (link_.depart()) delete value_;  in depart()  local
148     value_ = ptr;  in capture()
153     value_ = ptr->get();  in copy()
154     if (value_)  in copy()