x.html">rational</a> - A rational
        number class, from Paul Moore.</li>

    <li><a href="bind/ref.html">ref</a> - A utility library for
    passing references to generic functions, from Jaako J&auml;rvi,
    Peter Dimov, Doug Gregor, and Dave Abrahams.</li>

    <li><a href="regex/index.html">regex</a> - Regular expression
        library, from John Maddock.</li>
    <li><a href="signals/index.html">signals</a> - managed signals &amp;
         slots callback implementation, from Doug Gregor.</li>
   