" height="48" align="right" border="0"></a></td>
  </tr>
</table>
<br>
<table border="0">
  <tr>
    <td width="10"></td>
    <td width="30"><a href="../index.html"><img src="theme/u_arr.gif" border="0"></a></td>
    <td width="30"><a href="grammar.html"><img src="theme/l_arr.gif" border="0"></a></td>
    <td width="30"><a href="semantic_actions.html"><img src="theme/r_arr.gif" border="0"></a></td>
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</table>
<p>Spirit is implemented using expression templates. This is a very powerful technique.
  Alo