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    <td class="table_title" colspan="10"> class scanner </td>
  </tr>
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  <tr> 
    <td class="table_cells"><code><span class=identifier>value_t</span></code></td>
    <td class="table_cells">typedef: The value type of the scanner's iterator</td>
  </tr>
  <td class="table_cells"><code><span class=identifier>ref_t</span></code></td>
  <td class="table_cells">typedef: The reference type of the scanner's iterator</td>
  </tr>
  <td class="table_cells"><code><span class