or target.</p>
<p>This operation is not applicable to directed graphs, because the
incoming edges to vertex <tt class="docutils literal"><span class="pre">u</span></tt> are not known.</p>
<hr class="docutils" />
<pre class="literal-block">
void clear_out_edges(vertex_descriptor u, adjacency_list&amp; g);
</pre>
<p>Removes all out-edges from vertex <tt class="docutils literal"><span class="pre">u</span></tt>. The vertex still appears in
the vertex set of the graph.</p>
<p>The affect on descriptor and iterato