Tracing a private attribute

[Amin Dorostanian]

Hi all,

I am trying to trace an atrribute inside YansWifiModel but I can not cast my own object type to ns3 model. Any help would be appreciated.

This is my code:

class MyYansWifiPhy : public YansWifiPhy

{

public:

  static TypeId GetTypeId (void)

  {

    static TypeId tid = TypeId ("MyYansWifiPhy")

      .SetParent<ns3::YansWifiPhy> ()

      .AddConstructor<MyYansWifiPhy> ()

      .AddTraceSource ("ChannelWidth",

                       "Trace channel width.",

                       MakeTraceSourceAccessor (&MyYansWifiPhy::m_channelWidth),

                       "ns3::TracedValueCallback::uint32_t")

    ;

    return tid;

  }

  MyYansWifiPhy () {}

  TracedValue<uint32_t> m_channelWidth;

};

void

ChannelWidthTrace (uint32_t oldValue, uint32_t newValue)

{

  std::cout << "Traced Channel Width " << oldValue << " to " << newValue << std::endl;

}

 And here I want to get my object:

   ObjectPtrContainerValue phy_list ;

    my_channel->GetAttribute("PhyList",phy_list);

    // * First Path

    ns3::Ptr<ns3::Object> tmp_phy_0 = phy_list.Get(0);

    Ptr<MyYansWifiPhy> phy_0 = tmp_phy_0->GetObject<MyYansWifiPhy>();

Thanks in advance,

Amin

[Konstantinos]

Hi Amin,

The problem is here 

ns3::Ptr<ns3::Object> tmp_phy_0 = phy_list.Get(0);

Ptr<MyYansWifiPhy> phy_0 = tmp_phy_0->GetObject<MyYansWifiPhy>();

In order to GetObject() A from a class B, you have to have A aggregated to B. 

And that's not the case in you.

What you actually want is a DynamicCast of the Object you get from the phy_list to a MyYansWifiPhy object. 

Regards,

K.

[Amin Dorostanian]

Dear Konstantinos,

Thanks for your answer, could you please help me with writing this down casting?  
I tried to solve this with dynamic_cast but it returned 0x0 pointer. 

Thanks in advance,