CallBackID Node1 CallBackID - p_obj + CallBackID() + CallBackID() + set() + name() + objName() + offset() + ptr() + operator==() + operator<() Node2 std::string Node2->Node1 -m_objName -m_name Node3 std::basic_string< char > Node3->Node2 Node4 long Node4->Node1 -m_offset