[ndnSIM] ndnsim FIB add nexthop and delete

[费小罗]

hi all
now i  want to add a nexthop in FIB and set a timer to delete it
automatically, during simulating. but there are some problems
1)i get the specific node and add a nexthop ,and in the structure i defined
another attribution to show the nexthop node id. Is this effective? and can
it have some side effect ?

void Entry::addNextHop(Face& face, uint64_t cost,std::string nexthopmac) {
auto it = this->findNextHop(face); if (it == m_nextHops.end()) {
m_nextHops.emplace_back(face); it = std::prev(m_nextHops.end()); }
it->setNextHopMac(nexthopmac); it->setCost(cost); this->sortNextHops(); }

2）i also want to set a timer to delete nexthop, i do like following in
forwarder.cpp onIncomingData function. i run  sudo ./waf , there is no
error ,but when i run scenarios it shutdown suddenly. Is this because i
have done some work in 1)

nfd::scheduler::schedule(time::seconds(1),[&]{thisNode->GetObject<ns3::ndn::L3Protocol>()->getForwarder()->getFib().removeNextHop(*(fibEntry_bool.f
  irst),inFace);});
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