18   class ObservedPtr {
20     ObservedPtr() : m_pObservable(nullptr) {}  in ObservedPtr()  function
21     explicit ObservedPtr(T* pObservable) : m_pObservable(pObservable) {  in ObservedPtr()  function
25     ObservedPtr(const ObservedPtr& that) : ObservedPtr(that.Get()) {}  in ObservedPtr()  function
26     ~ObservedPtr() {  in ~ObservedPtr()
41     ObservedPtr& operator=(const ObservedPtr& that) {
45     bool operator==(const ObservedPtr& that) const {
48     bool operator!=(const ObservedPtr& that) const { return !(*this == that); }
61   void AddObservedPtr(ObservedPtr* pObservedPtr) {  in AddObservedPtr()
65   void RemoveObservedPtr(ObservedPtr* pObservedPtr) {  in RemoveObservedPtr()
80   std::set<ObservedPtr*> m_ObservedPtrs;