multithreading - Basic Threads using C++ -

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• start thread member function 4 answers

i trying create simple thread using c++. getting error: error 14 error c2276: '&' : illegal operation on bound member function expression

this code:

void peercommunication(peerdata &peerdata, std::string infohash) {     peer peer(peerdata.getip(), peerdata.getport(), infohash);     peer.createconnection();     peer.haspeace(0);     peer.recievepeace(0, 4056211 + 291);  }  tcppeers(orderedmap<std::string, unsigned short> peers, std::string infohash, bencoding bencoder) {     std::vector<std::thread> threads;     //std::thread ttt[num_threads];     //std::thread t1(task1, "hello");     (std::size_t = 0; < peers.getsize(); i++)     {         peerdata pd(peers.getkeybyindex(i), peers.getvaluebyindex(i));         std::thread t(&peercommunication, pd, infohash);         threads.push_back(t);     }      (std::size_t = 0; < peers.getsize(); i++)     {         threads.at(i).join();     }     ...   } 

i have tried remove reference: std::thread t(peercommunication, pd, infohash); , still doesn't works.

when (remove refernce) error is: error 4 error c3867: 'tcppeers::peercommunication': function call missing argument list; use '&tcppeers::peercommunication' create pointer member

you need return peercommunication() function.

i suspect want little more this:

for (std::size_t = 0; < peers.getsize(); i++) {     peerdata pd(peers.getkeybyindex(i), peers.getvaluebyindex(i));      // use emplace std::thread non-copyable     // pass pointer member functions     // use std::ref pass references     threads.emplace_back(&tcppeers::peercommunication, this, std::ref(pd), infohash); }  (std::size_t = 0; < peers.getsize(); i++) {     threads.at(i).join(); }