| 1 | <HTML> |
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| 2 | <!-- |
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| 3 | -- Copyright (c) 2004 Kris Beevers |
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| 4 | -- |
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| 5 | -- Distributed under the Boost Software License, Version 1.0. |
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| 6 | -- (See accompanying file LICENSE_1_0.txt or copy at |
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| 7 | -- http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | --> |
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| 9 | <Head> |
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| 10 | <Title>Boost Graph Library: astar_heuristic</Title> |
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| 11 | <BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" |
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| 12 | ALINK="#ff0000"> |
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| 13 | <IMG SRC="../../../boost.png" |
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| 14 | ALT="C++ Boost" width="277" height="86"> |
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| 15 | |
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| 16 | <BR Clear> |
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| 17 | |
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| 18 | <H1> |
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| 19 | <pre> |
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| 20 | astar_heuristic<Graph, CostType> |
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| 21 | </pre> |
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| 22 | </H1> |
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| 23 | |
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| 24 | This class is a default implementation of the <a |
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| 25 | href="./AStarHeuristic.html">AStarHeuristic</a> concept. It |
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| 26 | implements a "zero" heuristic -- a heuristic function that returns a |
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| 27 | cost of zero regardless of the vertex it is passed. |
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| 28 | |
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| 29 | <h3>Model of</h3> |
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| 30 | |
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| 31 | <a href="./AStarHeuristic.html">AStarHeuristic</a> |
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| 32 | |
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| 33 | <H3>Template Parameters</H3> |
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| 34 | |
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| 35 | <P> |
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| 36 | <TABLE border> |
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| 37 | <TR> |
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| 38 | <th>Parameter</th><th>Description</th><th>Default</th> |
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| 39 | </tr> |
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| 40 | |
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| 41 | <TR><TD><TT>Graph</TT></TD> |
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| 42 | <TD> |
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| 43 | The type of the graph being searched. |
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| 44 | </TD> |
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| 45 | <TD></TD> |
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| 46 | </TR> |
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| 47 | |
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| 48 | <TR><TD><TT>CostType</TT></TD> |
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| 49 | <TD> |
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| 50 | A type that can be used with the <tt>compare</tt> and |
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| 51 | <tt>combine</tt> functions passed to A*. Typically an integer or |
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| 52 | floating point type. |
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| 53 | </TD> |
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| 54 | <TD></TD> |
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| 55 | </TR> |
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| 56 | |
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| 57 | </table> |
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| 58 | |
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| 59 | <H3>Where Defined</H3> |
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| 60 | |
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| 61 | <P> |
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| 62 | <a href="../../../boost/graph/astar_search.hpp"> |
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| 63 | <TT>boost/graph/astar_search.hpp</TT></a> |
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| 64 | |
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| 65 | <h3>Member Functions</h3> |
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| 66 | |
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| 67 | This class implements the single member function required by <a |
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| 68 | href="./AStarHeuristic.html">AStarHeuristic</a>: |
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| 69 | |
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| 70 | <table border> |
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| 71 | <tr> |
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| 72 | <th>Function</th><th>Description</th> |
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| 73 | </tr> |
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| 74 | |
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| 75 | <tr><td><tt> |
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| 76 | CostType operator()(graph_traits<Graph>::vertex_descriptor u); |
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| 77 | </tt></td><td> |
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| 78 | Called for the target of every out edge of a vertex being examined. |
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| 79 | Returns the cost, estimated by the heuristic, from vertex <tt>u</tt> |
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| 80 | to a goal. |
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| 81 | </td></tr> |
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| 82 | |
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| 83 | </table> |
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| 84 | |
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| 85 | <br> |
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| 86 | <HR> |
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| 87 | <TABLE> |
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| 88 | <TR valign=top> |
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| 89 | <TD nowrap>Copyright © 2004</TD><TD> |
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| 90 | <A HREF="http://www.cs.rpi.edu/~beevek/">Kristopher Beevers</A>, |
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| 91 | Rensselaer Polytechnic Institute (<A |
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| 92 | HREF="mailto:beevek@cs.rpi.edu">beevek@cs.rpi.edu</A>) |
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| 93 | </TD></TR></TABLE> |
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| 94 | |
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| 95 | </BODY> |
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| 96 | </HTML> |
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