e policies. This scanner_policies 
  class is then used to parameterize the scanner:</p>
<pre>
    <code><span class=keyword>template </span><span class=special>&lt;
        </span><span class=keyword>typename </span><span class=identifier>IteratorT </span><span class=special>= </span><span class=keyword>char </span><span class=keyword>const</span><span class=special>*,
        </span><span class=keyword>typename </span><span class=identifier>PoliciesT </span><span class=special>= </span><span class=identif