projects / ceph.git / blame
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1 | <HTML> |
| 2 | <!-- | |
| 3 | Copyright (c) Jeremy Siek, Lie-Quan Lee, and Andrew Lumsdaine 2000 | |
| 4 | ||
| 5 | Distributed under the Boost Software License, Version 1.0. | |
| 6 | (See accompanying file LICENSE_1_0.txt or copy at | |
| 7 | http://www.boost.org/LICENSE_1_0.txt) | |
| 8 | --> | |
| 9 | <Head> | |
| 10 | <Title>Boost Graph Library: Visitor Concepts</Title> | |
| 11 | <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" | |
| 12 | ALINK="#ff0000"> | |
| 13 | <IMG SRC="../../../boost.png" | |
| 14 | ALT="C++ Boost" width="277" height="86"> | |
| 15 | ||
| 16 | <BR Clear> | |
| 17 | ||
| 18 | <H1><A NAME="sec:visitor-concepts"></A> | |
| 19 | Visitor Concepts | |
| 20 | </H1> | |
| 21 | ||
| 22 | <P> | |
| 23 | The visitor concepts plays the same role in BGL as <a | |
| 24 | href="http://www.sgi.com/tech/stl/functors.html">functors</a> | |
| 25 | play in the STL. Functors provide a mechanism for extending an | |
| 26 | algorithm; for customizing what is done at each step of the algorithm. | |
| 27 | Visitors allow the user to insert their own operations at various | |
| 28 | steps within a graph algorithm. Unlike the STL algorithms, graph | |
| 29 | algorithms typically have multiple event points where one may want to | |
| 30 | insert a call-back via a functor. Therefore visitors do not have a | |
| 31 | single <tt>operator()</tt> method like a functor, but instead have | |
| 32 | several methods that correspond to the various event points. Each | |
| 33 | algorithm has a different set of event points, which are described by | |
| 34 | the following visitor concepts: | |
| 35 | ||
| 36 | <ul> | |
| 37 | <li> <a href="./BFSVisitor.html">BFS Visitor</a> | |
| 38 | <li> <a href="./DFSVisitor.html">DFS Visitor</a> | |
| 39 | <li> <a href="./DijkstraVisitor.html">Dijkstra Visitor</a> | |
| 40 | <li> <a href="./BellmanFordVisitor.html">Bellman Ford Visitor</a> | |
| 41 | <li> <a href="./AStarVisitor.html">A* Visitor</a> | |
| 42 | <li> <a href="./EventVisitor.html">Event Visitor</a> | |
| 43 | <li> <a href="./PlanarFaceVisitor.html">Planar Face Visitor</a> | |
| 44 | <li> <a href="./TSPTourVisitor.html">TSP Tour Visitor</a> | |
| 45 | </ul> | |
| 46 | ||
| 47 | ||
| 48 | <br> | |
| 49 | <HR> | |
| 50 | <TABLE> | |
| 51 | <TR valign=top> | |
| 52 | <TD nowrap>Copyright © 2000-2001</TD><TD> | |
| 53 | <A HREF="http://www.boost.org/people/jeremy_siek.htm">Jeremy Siek</A>, | |
| 54 | Indiana University (<A | |
| 55 | HREF="mailto:jsiek@osl.iu.edu">jsiek@osl.iu.edu</A>)<br> | |
| 56 | <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> | |
| 57 | <A HREF="http://www.osl.iu.edu/~lums">Andrew Lumsdaine</A>, | |
| 58 | Indiana University (<A | |
| 59 | HREF="mailto:lums@osl.iu.edu">lums@osl.iu.edu</A>) | |
| 60 | </TD></TR></TABLE> | |
| 61 | ||
| 62 | </BODY> | |
| 63 | </HTML> |