...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Gets the non-blocking mode of the acceptor.
bool non_blocking() const;
true if the acceptor's synchronous
operations will fail with
if they are unable to perform the requested operation immediately. If
false, synchronous operations
will block until complete.
The non-blocking mode has no effect on the behaviour of asynchronous
operations. Asynchronous operations will never fail with the error