Function main

example/cpp11/invocation/prioritised_handlers.cpp:169–202

};

int main()
{
  boost::asio::io_context io_context;

  handler_priority_queue pri_queue;

  // Post a completion handler to be run immediately.
  boost::asio::post(io_context, pri_queue.wrap(0, low_priority_handler()));

  // Start an asynchronous accept that will complete immediately.
  tcp::endpoint endpoint(boost::asio::ip::address_v4::loopback(), 0);
  tcp::acceptor acceptor(io_context, endpoint);
  tcp::socket server_socket(io_context);
  acceptor.async_accept(pri_queue.wrap(100, high_priority_handler));
  tcp::socket client_socket(io_context);
  client_socket.connect(acceptor.local_endpoint());

  // Set a deadline timer to expire immediately.
  boost::asio::steady_timer timer(io_context);
  timer.expires_at(boost::asio::steady_timer::clock_type::time_point::min());
  timer.async_wait(pri_queue.wrap(42, middle_priority_handler));

  while (io_context.run_one())
  {
    // The custom invocation hook adds the handlers to the priority queue
    // rather than executing them from within the poll_one() call.
    while (io_context.poll_one())
      ;

    pri_queue.execute_all();
  }

  return 0;
}