Re: [boost] asio async_connect handler socket

From: Christopher Kohlhoff (chris_at_[hidden])
Date: 2005-12-11 15:13:55

Hi,

--- christopher baus <christopher_at_[hidden]> wrote:
> I'm currently trying to port an app from libevent to asio to
> test out the library.  I have a quick question.  Why doesn't
> the basic_stream_socket::async_connect handler pass a pointer
> to the socket? Is it assumed that the handler is a stateful
> functor and keeps a pointer to the socket?

The intention is that you use boost::bind to create the
appropriate function object:

void connect_handler(const boost::asio::error& error,
  boost::asio::stream_socket* socket)
{
  if (!error)
  {
    s->async_read_some(...);
  }
}

int main()
{
  boost::asio::stream_socket* socket = ...;
  ...
  socket->async_connect(endpoint,
      boost::bind(connect_handler, _1, socket)
  ...

  // Or if you don't want to remember the index of the
  // arguments:
  // socket->async_connect(endpoint,
  //     boost::bind(connect_handler,
  //       boost::asio::placeholders::error, socket));
}

Cheers,
Chris