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Establishes a connection by trying each endpoint in a sequence asynchronously.
template< class EndpointSequence, class RangeConnectHandler = net::default_completion_token_t<executor_type>> DEDUCED async_connect( EndpointSequence const& endpoints, RangeConnectHandler&& handler = net::default_completion_token_t< executor_type >{});
            This function attempts to connect the stream to one of a sequence of
            endpoints by trying each endpoint until a connection is successfully
            established. The underlying socket is automatically opened if needed.
            An automatically opened socket is not returned to the closed state upon
            failure. The algorithm, known as a composed asynchronous operation,
            is implemented in terms of calls to the underlying socket's async_connect function. If the timeout
            timer expires while the operation is outstanding, the current connection
            attempt will be canceled and the completion handler will be invoked with
            the error timeout.
          
| Name | Description | 
|---|---|
| 
                       | A sequence of endpoints. This this object must meet the requirements of EndpointSequence. | 
| 
                       | The completion handler to invoke when the operation completes. The implementation takes ownership of the handler by performing a decay-copy. The equivalent function signature of the handler must be: void handler( // Result of operation. if the sequence is empty, set to // net::error::not_found. Otherwise, contains the // error from the last connection attempt. error_code const& error, // On success, the successfully connected endpoint. // Otherwise, a default-constructed endpoint. typename Protocol::endpoint const& endpoint ); 
                      Regardless of whether the asynchronous operation completes
                      immediately or not, the handler will not be invoked from within
                      this function. Invocation of the handler will be performed
                      in a manner equivalent to using  |