Trk::AlSymMatBase Node1 Trk::AlSymMatBase # m_matrix_type + ~AlSymMatBase() + operator[]() + operator[]() + nrow() + ncol() + size() + matrix_type() + reSize() + elemr() + elemc() and 14 more... # AlSymMatBase() # AlSymMatBase() # AlSymMatBase() # operator=() Node2 std::map< indices, double > + keys + elements Node2->Node1 #m_ptr_map Node3 long Node3->Node1 #m_size #m_nele