e_size_type</TT>
</TD>
</TR>

</TABLE>

<P>

<H3>Complexity guarantees</H3>

<P>
The <TT>source()</TT>, <TT>target()</TT>, and <TT>out_edges()</TT>
functions must all be constant time. The <tt>out_degree()</tt>
function must be linear in the number of out-edges.

<P>

<H3>See Also</H3>

<a href="./graph_concepts.html">Graph concepts</a>

<H3>Notes</H3>

<a name="1">[1]</a> For undirected graphs, the edge <tt>(u,v)</tt> is
the same as edge <tt>(v,u)</tt>, so without some extra guarantee an
implementation wou