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- Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000
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- <Head>
- <Title>Boost Graph Library: Visitor Concepts</Title>
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- <BR Clear>
- <H1><A NAME="sec:visitor-concepts"></A>
- Visitor Concepts
- </H1>
- <P>
- The visitor concepts plays the same role in BGL as <a
- href="http://www.boost.org/sgi/stl/functors.html">functors</a>
- play in the STL. Functors provide a mechanism for extending an
- algorithm; for customizing what is done at each step of the algorithm.
- Visitors allow the user to insert their own operations at various
- steps within a graph algorithm. Unlike the STL algorithms, graph
- algorithms typically have multiple event points where one may want to
- insert a call-back via a functor. Therefore visitors do not have a
- single <tt>operator()</tt> method like a functor, but instead have
- several methods that correspond to the various event points. Each
- algorithm has a different set of event points, which are described by
- the following visitor concepts:
- <ul>
- <li> <a href="./BFSVisitor.html">BFS Visitor</a>
- <li> <a href="./DFSVisitor.html">DFS Visitor</a>
- <li> <a href="./DijkstraVisitor.html">Dijkstra Visitor</a>
- <li> <a href="./BellmanFordVisitor.html">Bellman Ford Visitor</a>
- <li> <a href="./AStarVisitor.html">A* Visitor</a>
- <li> <a href="./EventVisitor.html">Event Visitor</a>
- <li> <a href="./PlanarFaceVisitor.html">Planar Face Visitor</a>
- <li> <a href="./TSPTourVisitor.html">TSP Tour Visitor</a>
- </ul>
- <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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