Dynamic casting to ns3::Ptr<ns3::PointToPointNetDevice> failing.

[Anil Jangam]

HI,

I am trying to perform this dynamic casting but it is failing with the following error. I am not sure what is the error here?

ns3::Ptr<ns3::PointToPointNetDevice> netDevice_0 = dynamic_cast<ns3::Ptr<ns3::PointToPointNetDevice>>(node->GetDevice(0    ));

Compile error:

error: cannot dynamic_cast ‘ns3::Node::GetDevice(uint32_t) const(0u)’ (of type ‘class ns3::Ptr<ns3::NetDevice>’) to type ‘class ns3::Ptr<ns3::PointToPointNetDevice>’ (target is not pointer or reference)
   ns3::Ptr<ns3::PointToPointNetDevice> netDevice_0 = dynamic_cast<ns3::Ptr<ns3::PointToPointNetDevice>>(node->GetDevice(0));

The GetDevice() returns the type:  Ptr<NetDevice> GetDevice (uint32_t index) const; So guess I am doing the type casting according to the target data type. Is it something to do with the ns3::Ptr<T>? Also, the target type is of type ns3::Ptr<T> so I am not sure why the error message is saying hat target is not pointer or reference.

Can someone please help me understand why is this and possibly fix this?

Regards,
/anil.

[Tommaso Pecorella]

hI,

dynamic cast doesn't work on pointers... or better, it could, but Ptr is different: it's a template.

Usually you use DynamicCast, and on instances, not on their Ptr.

Hope this helps,

T.

[Anil Jangam]

Hi Tommaso,

Thanks for reply. I changed it as below and it worked.

ns3::PointToPointNetDevice *netDevice_0 = dynamic_cast<ns3::PointToPointNetDevice*>(&(*(node->GetDevice(0))));

But do you think if there is a better way of writing it? This looks very untidy.

/anil

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[Tommaso Pecorella]

Hi,

yes, the paint is that you shouldn't really be working with pointers to NetDevices. Or better, the need for a dynamic cast of NetDevice pointers have never been really foreseen.

Question is: are you sure you need it ?

Cheers,

T.