>
                    </p>
                  </td>
<td>
                    <p>
                      The number of valid bytes in <code class="computeroutput"><span class="identifier">buffer</span></code>.
                    </p>
                  </td>
</tr>
</tbody>
</table></div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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