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<!--
-- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
--
-- Distributed under the Boost Software License, Version 1.0.
-- (See accompanying file LICENSE_1_0.txt or copy at
-- http://www.boost.org/LICENSE_1_0.txt)
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<Head>
<Title>Boost Graph Library: incident</Title>
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
ALINK="#ff0000">
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<H1><A NAME="sec:incident"></A>
<TT>incident</TT>
</H1>
<P>
<DIV ALIGN="left">
<TABLE CELLPADDING=3 border>
<TR><TH ALIGN="LEFT"><B>Complexity:</B></TH>
<TD ALIGN="LEFT"><i>O(1)</i>
</TD>
</TR>
<TR><TH ALIGN="LEFT"><B>Where Defined:</B></TH>
<TD ALIGN="LEFT">
<a href="../../../boost/graph/graph_utility.hpp"><TT>boost/graph/graph_utility.hpp</TT></a>
</TD>
</TABLE>
</DIV>
<P>
<PRE>
template <class Graph>
std::pair<typename graph_traits<Graph>::vertex_descriptor,
typename graph_traits<Graph>::vertex_descriptor>
incident(typename graph_traits<Graph>::edge_descriptor e, Graph& g)
</pre>
This function takes and edge descriptor and returns the pair of
vertices that are <i>incident</i> to the edge. For directed graphs,
the <tt>first</tt> vertex is the source and the <tt>second</tt> vertex
is the target. This function is equivalent to the expression
<tt>std::make_pair(source(e, g), target(e, g))</tt>.
<h3>Example</h3>
<pre>
edge_descriptor e;
vertex_descriptor u, v;
...
tie(u, v) = incident(e, g);
</pre>
<br>
<HR>
<TABLE>
<TR valign=top>
<TD nowrap>Copyright © 2000-2001</TD><TD>
<A HREF="../../../people/jeremy_siek.htm">Jeremy Siek</A>,
Indiana University (<A
HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
<A HREF="../../../people/liequan_lee.htm">Lie-Quan Lee</A>, Indiana University (<A HREF="mailto:llee@cs.indiana.edu">llee@cs.indiana.edu</A>)<br>
<A HREF=http://www.osl.iu.edu/~lums>Andrew Lumsdaine</A>,
Indiana University (<A
HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
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