nctions</h3>



<hr>
<pre>
subgraph(vertices_size_type n, const GraphProperty&amp; p = GraphProperty())
</pre>
    Creates the root graph object with <tt>n</tt> vertices and zero edges.

<hr>
<pre>
subgraph&lt;Graph&gt;& create_subgraph();
</pre>
    Creates an empty subgraph object whose parent is <i>this</i>
    graph.

<hr>
<pre>
template &lt;typename VertexIterator&gt;
subgraph&lt;Graph&gt;&amp;
create_subgraph(VertexIterator first, VertexIterator last)
</pre>
    Creates a subgraph object with the spec