an extra call to the copy constructor of each type.
        </p>
<p>
          The following code snippet shows the relation between a bimap and standard
          maps.
        </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top">
<p>
            You have to used references to views, and not directly views 