787     class Callback : public Clearable<Callback>  class in ot::Dns::Multicast::Core
790         Callback(void) { Clear(); }  in Callback()  function in ot::Dns::Multicast::Core::Callback
791         Callback(RequestId aRequestId, RegisterCallback aCallback);
954         void  Register(const Key &aKey, const Callback &aCallback);
979         void SetCallback(const Callback &aCallback);
1020         Callback   mCallback;
1021         Callback   mKeyCallback;
1043         void  Register(const Host &aHost, const Callback &aCallback);
1044         void  Register(const Key &aKey, const Callback &aCallback);
1101         void  Register(const Service &aService, const Callback &aCallback);
1102         void  Register(const Key &aKey, const Callback &aCallback);