vertex</tt></td>
<td>in</td>
<td><tt class="docutils literal">graph</tt>'s vertex descriptor
type.</td>
<td><tt class="docutils literal"><span class="pre">*vertices(graph).first</span></tt></td>
</tr>
<tr><td><tt class="docutils literal">index_map</tt></td>
<td>in</td>
<td>Model of <a class="reference external" href="../../../property_map/doc/ReadablePropertyMap.html"><span class="concept">Readable Property Map</span></a>
with key type := <tt class="docutils literal">graph</tt>'s
vertex descriptor and value