oy contributed the
    code which supports the new usage idiom while allowing the library remain
    backward-compatible.</p>
    <hr>

    <p>Revised: 7 Aug 2008</p>

    <p>Copyright &copy; Beman Dawes, David Abrahams, 1999-2001.</p>
    <p>Copyright &copy; Daniel Frey, 2002-2009.</p>
    <p>Use, modification, and distribution is subject to the Boost Software
    License, Version 1.0. (See accompanying file
    <a href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or copy at
    <a href="http://www.boost.or