lwtDev::ISource Node1 lwtDev::ISource + ~ISource() + at() + matrix_at() Node2 lwtDev::DummySource - m_sizes - m_matrix_sizes + DummySource() + at() + matrix_at() Node1->Node2 Node3 lwtDev::VectorSource - m_inputs - m_matrix_inputs + VectorSource() + at() + matrix_at() Node1->Node3