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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)
- -->
- <Head>
- <Title>Boost Graph Library: opposite</Title>
- <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
- ALINK="#ff0000">
- <IMG SRC="../../../boost.png"
- ALT="C++ Boost" width="277" height="86">
- <BR Clear>
- <H1><A NAME="sec:opposite"></A>
- <TT>opposite</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>
- typename graph_traits<Graph>::vertex_descriptor
- opposite(typename graph_traits<Graph>::edge_descriptor e,
- typename graph_traits<Graph>::vertex_descriptor v,
- const Graph& g)
- </pre>
- Given an edge and a vertex which must be incident to the edge, this
- function returns the opposite vertex. So if <tt>v</tt> is the source
- vertex, this function returns the target vertex. If <tt>v</tt> is the
- target, then this function returns the source vertex.
- <h3>Example</h3>
- <pre>
- edge_descriptor e;
- ...
- vertex_descriptor u, v;
- boost::tie(u, v) = incident(e, g);
- assert(v == opposite(e, u, g));
- assert(u == opposite(e, v, g));
- </pre>
- <br>
- <HR>
- <TABLE>
- <TR valign=top>
- <TD nowrap>Copyright © 2000-2001</TD><TD>
- <A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>,
- Indiana University (<A
- HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
- <A HREF="http://www.boost.org/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="https://homes.cs.washington.edu/~al75">Andrew Lumsdaine</A>,
- Indiana University (<A
- HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
- </TD></TR></TABLE>
- </BODY>
- </HTML>
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