Function timeout

3rdParty/asio/include/asio/basic_socket_streambuf.hpp:594–604

  }

  int timeout() const
  {
    int64_t msec = traits_helper::to_posix_duration(
        traits_helper::subtract(expiry_time_,
          traits_helper::now())).total_milliseconds();
    if (msec > (std::numeric_limits<int>::max)())
      msec = (std::numeric_limits<int>::max)();
    else if (msec < 0)
      msec = 0;
    return static_cast<int>(msec);
  }

  template <typename EndpointSequence>
  void connect_to_endpoints(const EndpointSequence& endpoints)