reading ZMQ_FD

gistfile1.cpp

#include <zmq.hpp>
#include <assert.h>

int main(int argc, char* argv[]) 
{
  zmq::context_t context(1);
  
  // setup xreq and get fd
  zmq::socket_t xreq(context, ZMQ_XREQ);
  xreq.bind("tcp://127.0.0.1:13333");
  size_t opt_size;
  int xreq_fd = -1;
  xreq.getsockopt(ZMQ_FD, &xreq_fd, &opt_size);
  assert(xreq_fd > 0);
}