...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Inherited from basic_socket.
Determine whether the socket is at the out-of-band data mark.
bool at_mark() const;
This function is used to check whether the socket input is currently positioned at the out-of-band data mark.
A bool indicating whether the socket is at the out-of-band data mark.
Thrown on failure.