havior is not desired, you may need to position the scanner 
      yourself. The <a href="numerics.html#scanner_save">example in the numerics 
      chapter</a> illustrates how the scanner position can be saved and later 
      restored.</td>
  </tr>
</table>
<p>Where <tt>p</tt> is the parser we want to use, and <tt>first</tt>/<tt>last</tt> 
  are the iterator pairs referring to the input. We just create a scanner given 
  the iterators. The scanner type we will use here uses the default <tt>scanner_policie