[ndnSIM] getting PIT size?

[Narges Mehran]

Hello everyone,

I want to get the PIT size at the moment, although I know that it isn't
needed to allocate PIT size in NFD. When I run the following code, I get
this error, any help?

Ptr<ns3::ndn::nfd::Pit> pit = (*node)->GetObject<ns3::ndn::nfd::Pit>();
cout <<  pit->size() << "\t";

 ./ns3/ptr.h:710:7:  error: ‘class nfd::Pit’ has no member named ‘Ref’
 m_ptr->Ref ();
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