31     using Callback = fu2::unique_function<void(EventBase& source)>;  typedef in sdeventplus::source::EventBase
33     /** @brief Sets the callback
35      *  @param[in] callback - The function executed on event dispatch
37     void set_callback(Callback&& callback);
55      *         reconfigured upon each callback.
60      *  @param[in] callback - The function executed on event dispatch
63               Callback&& callback);
72     /** @brief Returns a reference to the callback executed for this source
74      *  @return A reference to the callback
76     Callback& get_callback();
89     /** @brief A wrapper around the callback that can be called from sd-event
104     EventBase::Callback callback;  member in sdeventplus::source::detail::EventBaseData
107     EventBaseData(const EventBase& base, EventBase::Callback&& callback);
118      *         Executes the callback upon events occurring
121      *  @param[in] callback - The function executed on event dispatch
124     Defer(const Event& event, Callback&& Callback);
131      *         Executes the callback upon events occurring
134      *  @param[in] callback - The function executed on event dispatch
137     Post(const Event& event, Callback&& callback);
144      *         Executes the callback upon events occurring
147      *  @param[in] callback - The function executed on event dispatch
150     Exit(const Event& event, Callback&& callback);