libsigc++  3.6.0
New API in libsigc++ 3.4
Member sigc::track_object (const T_functor& func, const T_obj1& obj1, const T_objs&...objs)
Class sigc::trackable_signal< T_return(T_arg...)>
Class sigc::trackable_signal< T_return(T_arg...)>::accumulated< T_accumulator >
Class sigc::trackable_signal_with_accumulator< T_return, T_accumulator, T_arg >