[ndnSIM] Declare ContentStore

[Asim ALHIMSYA]

Dears,
I'm trying to run the following (from ndn-cs-tracer.cpp) :

void CsTracer::Connect()
{
  // // @TODO Do the same with NFD content store...
   Ptr<ContentStore> cs = m_nodePtr->GetObject<ContentStore>();

 cs->TraceConnectWithoutContext("CacheHits",MakeCallback(&CsTracer::CacheHits,
this));

 cs->TraceConnectWithoutContext("CacheMisses",MakeCallback(&CsTracer::CacheMisses,
this));

  Reset();
}

but still getting stuck into the following error
../src/ndnSIM/utils/tracers/ndn-cs-tracer.cpp:203:8: error: ‘ContentStore’
was not declared in this scope

How can I declare ContentStore in ndn2.8

Thanks
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