New API in libsigc++ 2.4

Member sigc::signal_base::block (bool should_block=true) noexcept
Member sigc::signal_base::blocked () const noexcept
Member sigc::signal_base::unblock () noexcept
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1, const T_obj2& _A_obj2, const T_obj3& _A_obj3, const T_obj4& _A_obj4, const T_obj5& _A_obj5)
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1, const T_obj2& _A_obj2, const T_obj3& _A_obj3, const T_obj4& _A_obj4)
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1, const T_obj2& _A_obj2, const T_obj3& _A_obj3, const T_obj4& _A_obj4, const T_obj5& _A_obj5, const T_obj6& _A_obj6)
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1, const T_obj2& _A_obj2, const T_obj3& _A_obj3, const T_obj4& _A_obj4, const T_obj5& _A_obj5, const T_obj6& _A_obj6, const T_obj7& _A_obj7)
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1)
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1, const T_obj2& _A_obj2)
Member sigc::track_obj (const T_functor& _A_func, const T_obj1& _A_obj1, const T_obj2& _A_obj2, const T_obj3& _A_obj3)
Class sigc::track_obj_functor1< T_functor, T_obj1 >
Class sigc::track_obj_functor2< T_functor, T_obj1, T_obj2 >
Class sigc::track_obj_functor3< T_functor, T_obj1, T_obj2, T_obj3 >
Class sigc::track_obj_functor4< T_functor, T_obj1, T_obj2, T_obj3, T_obj4 >
Class sigc::track_obj_functor5< T_functor, T_obj1, T_obj2, T_obj3, T_obj4, T_obj5 >
Class sigc::track_obj_functor6< T_functor, T_obj1, T_obj2, T_obj3, T_obj4, T_obj5, T_obj6 >
Class sigc::track_obj_functor7< T_functor, T_obj1, T_obj2, T_obj3, T_obj4, T_obj5, T_obj6, T_obj7 >
Module track_obj