dels <a
href="./BidirectionalGraph.html">BidirectionalGraph</a>.<br>
Return type: <TT>void</TT>
</TD>
</TR>


<tr>
<TD><a name="sec:add-vertex"><TT>add_vertex(g)</TT></a></TD>
<TD>
Add a new vertex to the graph. The <TT>vertex_descriptor</TT> for the
new vertex is returned.<br>
Return type: <TT>vertex_descriptor</TT>
</TD>
</TR>


<tr>
<TD><TT>clear_vertex(u,&nbsp;g)</TT></TD>
<TD>
Remove all edges to and from vertex <tt>u</tt> from the graph.<br>
Return type: <TT>void</TT><br>
Precondition: <tt>u</tt> is a