28   std::function<bool()> callback;  member
31   IOEvent(IOEventLoop* loop, const std::function<bool()>& callback)  in IOEvent()
32       : loop(loop), e(nullptr), timeout({}), callback(callback), enabled(false) {  in IOEvent()
97   if (!e->callback()) {  in EventCallbackFn()
113                                      const std::function<bool()>& callback) {  in AddReadEvent()  argument
117   return AddEvent(fd, EV_READ | EV_PERSIST, nullptr, callback);  in AddReadEvent()
121                                       const std::function<bool()>& callback) {  in AddWriteEvent()  argument
125   return AddEvent(fd, EV_WRITE | EV_PERSIST, nullptr, callback);  in AddWriteEvent()
129                                  const std::function<bool()>& callback) {  in AddSignalEvent()  argument
130   return AddEvent(sig, EV_SIGNAL | EV_PERSIST, nullptr, callback) != nullptr;  in AddSignalEvent()
134                                   const std::function<bool()>& callback) {  in AddSignalEvents()  argument
136     if (!AddSignalEvent(sig, callback)) {  in AddSignalEvents()
143 IOEventRef IOEventLoop::AddPeriodicEvent(timeval duration, const std::function<bool()>& callback) {  in AddPeriodicEvent()  argument
144   return AddEvent(-1, EV_PERSIST, &duration, callback);  in AddPeriodicEvent()
148                                  const std::function<bool()>& callback) {  in AddEvent()  argument
152   std::unique_ptr<IOEvent> e(new IOEvent(this, callback));  in AddEvent()