ues of different value types, from Kevlin Henney.</li>
    <li><a href="utility/compressed_pair.htm">compressed_pair</a>
        - Empty member optimization, from John Maddock, Howard
        Hinnant, et al.</li>
    <li><a href="tuple/doc/tuple_users_guide.html">tuple</a> - Ease definition of functions returning multiple values, and more,
    from Jaakko Järvi.</li>
    <li><a href="variant/index.html">variant</a> - Safe, generic, stack-based
    discriminated union container, from Eric Friedman and Itay 