63 }

    64 

    65 //

    66 // Copy constructor for CsmaCdNetDevice.

    67 //

    68 // We use the underlying NetDevice copy constructor to get the base class

    69 // copied.  These just remain as is (e.g. you get the same name, the same

    70 // MAC address).  If you need to fix them up, YOU, the copier need to do 

    71 // that.

    72 // 

    73 // The things we need to be careful of are the channel, the queue and the

    74 // trace callback.  If the channel pointer is non-zero, we copy the pointer 

    75 // and add a reference.  If the queue is non-zero, we copy it using the queue

    76 // assignment operator.  We don't mess with the trace -- we just reset it.

    77 // We're assuming that the tracing will be set up after the topology creation

    78 // phase and this won't actually matter.

    79 //

    80 

    81 CsmaCdNetDevice::CsmaCdNetDevice (const CsmaCdNetDevice& nd)

    82   : NetDevice(nd), m_bps (nd.m_bps)

    83 {

    84   NS_DEBUG ("CsmaCdNetDevice::CsmaCdNetDevice (" << &nd << ")");

    85 

    86   m_txMachineState = READY;

    87   m_tInterframeGap = nd.m_tInterframeGap;

    88   m_backoff = nd.m_backoff;

    89   m_channel = nd.m_channel; 

    90   m_queue = 0;

    91   m_pktType = nd.m_pktType;

    92   m_sendEnable = nd.m_sendEnable;

    93   m_receiveEnable = nd.m_receiveEnable;

    94     

    95   if (nd.m_queue)

    96     {

    97       m_queue = nd.m_queue;

    98     }

    99