[ndnSIM] how to add private member variable in class Intererst

[gc199211]

Hi sir :
     I find  out that my last email is incomplete in maillist, so I  finish it  and send again.  
     I am  trying to add  hop information in Interest recently on ndnSIM 2.2. Here is my code.
1). I add a private member variable  which is named hop in ndnSIM/ndn-cxx/src/interest.h 
            private:
                          Name m_name;
                                      ......
                         mutable Block m_wire;
                          int hop;           // a new private member variable                       
                   
2). I increace the value of hop in the nfd::Forwarder::onOutgoingInterest(shared_ptr<pit::Entry> pitEntry, Face& outFace,bool  wantNewNonce),so as to caculate the hop .
  
               int tmpHop=interest->getHop();
               tmpHop++;
               interest->setHop(tmpHop);                 

Here is my problem,It seems that the hop value is always 0 no matter how many nodes it is forwarded.How to solve the problem? I know there is a ns3::ndn::FwHopCountTag a to caculate the hop in ns3::ndn::NetDeviceLinkService ,But I want to caculate the hop value directly in Interest. If it works ,I can add other member variable in Interest  which is quite important for my research.Thank you very much .
                                                                                                                                                                                       
2016-12-20


gc199211 
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