80 lines
2.1 KiB
HTML
80 lines
2.1 KiB
HTML
<HTML>
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<!--
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Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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-->
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<Head>
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<Title>Boost Graph Library: opposite</Title>
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<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
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ALINK="#ff0000">
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<IMG SRC="../../../boost.png"
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ALT="C++ Boost" width="277" height="86">
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<BR Clear>
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<H1><A NAME="sec:opposite"></A>
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<TT>opposite</TT>
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</H1>
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<P>
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<DIV ALIGN="left">
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<TABLE CELLPADDING=3 border>
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<TR><TH ALIGN="LEFT"><B>Complexity:</B></TH>
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<TD ALIGN="LEFT"><i>O(1)</i>
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</TD>
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</TR>
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<TR><TH ALIGN="LEFT"><B>Where Defined:</B></TH>
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<TD ALIGN="LEFT">
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<a href="../../../boost/graph/graph_utility.hpp"><TT>boost/graph/graph_utility.hpp</TT></a>
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</TD>
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</TABLE>
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</DIV>
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<P>
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<PRE>
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template <class Graph>
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typename graph_traits<Graph>::vertex_descriptor
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opposite(typename graph_traits<Graph>::edge_descriptor e,
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typename graph_traits<Graph>::vertex_descriptor v,
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const Graph& g)
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</pre>
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Given an edge and a vertex which must be incident to the edge, this
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function returns the opposite vertex. So if <tt>v</tt> is the source
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vertex, this function returns the target vertex. If <tt>v</tt> is the
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target, then this function returns the source vertex.
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<h3>Example</h3>
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<pre>
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edge_descriptor e;
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...
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vertex_descriptor u, v;
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boost::tie(u, v) = incident(e, g);
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assert(v == opposite(e, u, g));
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assert(u == opposite(e, v, g));
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</pre>
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<br>
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<HR>
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<TABLE>
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<TR valign=top>
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<TD nowrap>Copyright © 2000-2001</TD><TD>
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<A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>,
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Indiana University (<A
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HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br>
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<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>
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<A HREF="https://homes.cs.washington.edu/~al75">Andrew Lumsdaine</A>,
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Indiana University (<A
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HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>)
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</TD></TR></TABLE>
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</BODY>
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</HTML>
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