ystem operations, from 
    Beman Dawes.</li>
    <li><a href="format/index.html">format</a> - Type-safe 'printf-like' format 
    operations, from Samuel Krempp.</li>
    <li><a href="function/index.html">function</a> - Function object wrappers
      for deferred calls or callbacks, from Doug Gregor.</li>
    <li><a href="functional/index.html">functional</a> - Enhanced
        function object adaptors, from Mark Rodgers.</li>
    <li><a href="graph/doc/table_of_contents.html">graph</a> -
        Generic g