on_90_with_holes_concept&gt;(polygon_45_with_holes_object)</font><br />
      <font face="Courier New">view_as&lt;polygon_45_concept&gt;(polygon_45_with_holes_object)</font></p>
      <p>The return value of <font face="Courier New">view_as&lt;&gt;()</font>
can be passed into any interface that expects an object of the
conceptual type specified in its template parameter. </p>
      <h2>Functions</h2>
      <table id="table1" border="1" width="100%">
        <tbody>
          <tr>
            <td width="586">