...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
(Deprecated: Use range overload.) Establishes a socket connection by trying each endpoint in a sequence.
template< typename Protocol, typename Executor, typename Iterator, typename ConnectCondition> Iterator connect( basic_socket< Protocol, Executor > & s, Iterator begin, ConnectCondition connect_condition, boost::system::error_code & ec, constraint_t< !is_endpoint_sequence< Iterator >::value > = 0, constraint_t< is_connect_condition< ConnectCondition, Iterator >::value > = 0);
This function attempts to connect a socket to one of a sequence of endpoints.
It does this by repeated calls to the socket's connect
member function, once for each endpoint in the sequence, until a connection
is successfully established.
The socket to be connected. If the socket is already open, it will be closed.
An iterator pointing to the start of a sequence of endpoints.
A function object that is called prior to each connection attempt. The signature of the function object must be:
bool connect_condition( const boost::system::error_code& ec, const typename Protocol::endpoint& next);
The ec
parameter
contains the result from the most recent connect operation. Before
the first connection attempt, ec
is always set to indicate success. The next
parameter is the next endpoint to be tried. The function object should
return true if the next endpoint should be tried, and false if it
should be skipped.
Set to indicate what error occurred, if any. If the sequence is empty,
set to boost::asio::error::not_found
. Otherwise, contains
the error from the last connection attempt.
On success, an iterator denoting the successfully connected endpoint. Otherwise, the end iterator.
This overload assumes that a default constructed object of type Iterator
represents the end of the sequence.
This is a valid assumption for iterator types such as boost::asio::ip::tcp::resolver::iterator
.