asio::ip::tcp::socket::is_open returns true while connecting asynchronously

[Benjamin Carlyle <ben.carlyle@…>]

I am using boost 1.38.0 on Linux, and am finding that calls to is_open on an ip::tcp::socket return true as soon as async_connect is called and before the handler for the connection is invoked. This is relatively straightforward to work around, but annoying.

boost/asio/detail/reactive_socket_service.hpp line 216:

bool is_open(const implementation_type& impl) const {

return impl.socket_ != invalid_socket;

}

boost/asio/detail/reactive_socket_service.hpp line 182:

impl.socket_ = sock.release(); (an async_connect is still happening at this time)

[chris_kohlhoff]

This is the intended behaviour. The socket has to be open or otherwise you wouldn't be able to cancel the asynchronous connect operation.