#### basic_datagram_socket::at_mark

Determine whether the socket is at the out-of-band data mark.

    bool at_mark() const;
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    bool at_mark(
        asio::error_code & ec) const;
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| Copyright © 2003-2018 Christopher M. Kohlhoff Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)