...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Determine whether the socket is at the out-of-band data mark.
bool at_mark( boost::system::error_code & ec) const;
This function is used to check whether the socket input is currently positioned at the out-of-band data mark.
Set to indicate what error occurred, if any.
A bool indicating whether the socket is at the out-of-band data mark.