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| 3 | -- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000 |
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| 11 | -- purpose. It is provided "as is" without express or implied warranty. |
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| 12 | --> |
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| 13 | <Head> |
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| 14 | <Title>Boost Graph Library: opposite</Title> |
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| 15 | <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" |
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| 16 | ALINK="#ff0000"> |
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| 17 | <IMG SRC="../../../boost.png" |
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| 18 | ALT="C++ Boost" width="277" height="86"> |
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| 19 | |
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| 20 | <BR Clear> |
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| 21 | |
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| 22 | <H1><A NAME="sec:opposite"></A> |
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| 23 | <TT>opposite</TT> |
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| 24 | </H1> |
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| 25 | |
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| 26 | <P> |
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| 27 | <DIV ALIGN="left"> |
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| 28 | <TABLE CELLPADDING=3 border> |
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| 29 | |
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| 30 | <TR><TH ALIGN="LEFT"><B>Complexity:</B></TH> |
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| 31 | <TD ALIGN="LEFT"><i>O(1)</i> |
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| 32 | </TD> |
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| 33 | </TR> |
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| 34 | |
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| 35 | <TR><TH ALIGN="LEFT"><B>Where Defined:</B></TH> |
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| 36 | <TD ALIGN="LEFT"> |
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| 37 | <a href="../../../boost/graph/graph_utility.hpp"><TT>boost/graph/graph_utility.hpp</TT></a> |
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| 38 | </TD> |
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| 39 | |
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| 40 | </TABLE> |
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| 41 | </DIV> |
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| 42 | |
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| 43 | <P> |
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| 44 | <PRE> |
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| 45 | template <class Graph> |
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| 46 | typename graph_traits<Graph>::vertex_descriptor |
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| 47 | opposite(typename graph_traits<Graph>::edge_descriptor e, |
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| 48 | typename graph_traits<Graph>::vertex_descriptor v, |
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| 49 | const Graph& g) |
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| 50 | </pre> |
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| 51 | |
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| 52 | Given an edge and a vertex which must be incident to the edge, this |
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| 53 | function returns the opposite vertex. So if <tt>v</tt> is the source |
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| 54 | vertex, this function returns the target vertex. If <tt>v</tt> is the |
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| 55 | target, then this function returns the source vertex. |
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| 56 | |
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| 57 | <h3>Example</h3> |
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| 58 | |
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| 59 | <pre> |
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| 60 | edge_descriptor e; |
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| 61 | ... |
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| 62 | vertex_descriptor u, v; |
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| 63 | tie(u, v) = incident(e, g); |
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| 64 | assert(v == opposite(e, u, g)); |
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| 65 | assert(u == opposite(e, v, g)); |
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| 66 | </pre> |
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| 67 | |
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| 68 | <br> |
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| 69 | <HR> |
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| 70 | <TABLE> |
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| 71 | <TR valign=top> |
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| 72 | <TD nowrap>Copyright © 2000-2001</TD><TD> |
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| 73 | <A HREF="../../../people/jeremy_siek.htm">Jeremy Siek</A>, |
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| 74 | Indiana University (<A |
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| 75 | HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br> |
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| 76 | <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> |
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| 77 | <A HREF=http://www.osl.iu.edu/~lums>Andrew Lumsdaine</A>, |
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| 78 | Indiana University (<A |
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| 79 | HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>) |
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| 80 | </TD></TR></TABLE> |
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| 81 | |
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| 82 | </BODY> |
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| 83 | </HTML> |
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