1 | /* -*- C++ -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library |
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4 | * |
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5 | * Copyright (C) 2003-2008 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | ///\file |
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20 | ///\brief Test cases for Dijkstra algorithm. |
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21 | |
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22 | #include <lemon/concepts/digraph.h> |
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23 | #include <lemon/smart_graph.h> |
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24 | #include <lemon/list_graph.h> |
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25 | #include <lemon/graph_utils.h> |
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26 | #include <lemon/dijkstra.h> |
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27 | #include <lemon/path.h> |
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28 | |
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29 | #include "test_tools.h" |
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30 | |
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31 | using namespace lemon; |
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32 | |
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33 | void checkDijkstraCompile() |
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34 | { |
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35 | typedef int VType; |
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36 | typedef concepts::Digraph Digraph; |
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37 | typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap; |
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38 | typedef Dijkstra<Digraph, LengthMap> DType; |
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39 | |
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40 | Digraph G; |
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41 | Digraph::Node n; |
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42 | Digraph::Arc e; |
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43 | VType l; |
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44 | bool b; |
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45 | DType::DistMap d(G); |
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46 | DType::PredMap p(G); |
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47 | // DType::PredNodeMap pn(G); |
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48 | LengthMap length; |
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49 | |
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50 | DType dijkstra_test(G,length); |
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51 | |
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52 | dijkstra_test.run(n); |
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53 | |
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54 | l = dijkstra_test.dist(n); |
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55 | e = dijkstra_test.predArc(n); |
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56 | n = dijkstra_test.predNode(n); |
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57 | d = dijkstra_test.distMap(); |
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58 | p = dijkstra_test.predMap(); |
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59 | // pn = dijkstra_test.predNodeMap(); |
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60 | b = dijkstra_test.reached(n); |
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61 | |
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62 | Path<Digraph> pp = dijkstra_test.path(n); |
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63 | } |
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64 | |
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65 | void checkDijkstraFunctionCompile() |
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66 | { |
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67 | typedef int VType; |
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68 | typedef concepts::Digraph Digraph; |
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69 | typedef Digraph::Arc Arc; |
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70 | typedef Digraph::Node Node; |
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71 | typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap; |
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72 | |
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73 | Digraph g; |
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74 | dijkstra(g,LengthMap(),Node()).run(); |
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75 | dijkstra(g,LengthMap()).source(Node()).run(); |
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76 | dijkstra(g,LengthMap()) |
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77 | .predMap(concepts::WriteMap<Node,Arc>()) |
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78 | .distMap(concepts::WriteMap<Node,VType>()) |
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79 | .run(Node()); |
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80 | } |
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81 | |
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82 | template <class Digraph> |
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83 | void checkDijkstra() { |
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84 | TEMPLATE_DIGRAPH_TYPEDEFS(Digraph); |
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85 | typedef typename Digraph::template ArcMap<int> LengthMap; |
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86 | |
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87 | Digraph G; |
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88 | Node s, t; |
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89 | LengthMap length(G); |
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90 | PetStruct<Digraph> ps = addPetersen(G, 5); |
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91 | |
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92 | for(int i=0;i<5;i++) { |
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93 | length[ps.outcir[i]]=4; |
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94 | length[ps.incir[i]]=1; |
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95 | length[ps.chords[i]]=10; |
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96 | } |
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97 | s=ps.outer[0]; |
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98 | t=ps.inner[1]; |
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99 | |
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100 | Dijkstra<Digraph, LengthMap> |
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101 | dijkstra_test(G, length); |
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102 | dijkstra_test.run(s); |
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103 | |
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104 | check(dijkstra_test.dist(t)==13,"Dijkstra found a wrong path."); |
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105 | |
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106 | Path<Digraph> p = dijkstra_test.path(t); |
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107 | check(p.length()==4,"getPath() found a wrong path."); |
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108 | check(checkPath(G, p),"path() found a wrong path."); |
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109 | check(pathSource(G, p) == s,"path() found a wrong path."); |
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110 | check(pathTarget(G, p) == t,"path() found a wrong path."); |
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111 | |
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112 | for(ArcIt e(G); e!=INVALID; ++e) { |
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113 | Node u=G.source(e); |
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114 | Node v=G.target(e); |
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115 | check( !dijkstra_test.reached(u) || (dijkstra_test.dist(v) - dijkstra_test.dist(u) <= length[e]), |
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116 | "dist(target)-dist(source)-arc_length= " << dijkstra_test.dist(v) - dijkstra_test.dist(u) - length[e]); |
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117 | } |
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118 | |
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119 | for(NodeIt v(G); v!=INVALID; ++v){ |
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120 | check(dijkstra_test.reached(v),"Each node should be reached."); |
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121 | if ( dijkstra_test.predArc(v)!=INVALID ) { |
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122 | Arc e=dijkstra_test.predArc(v); |
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123 | Node u=G.source(e); |
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124 | check(u==dijkstra_test.predNode(v),"Wrong tree."); |
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125 | check(dijkstra_test.dist(v) - dijkstra_test.dist(u) == length[e], |
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126 | "Wrong distance! Difference: " << std::abs(dijkstra_test.dist(v) - dijkstra_test.dist(u) - length[e])); |
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127 | } |
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128 | } |
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129 | |
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130 | { |
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131 | NullMap<Node,Arc> myPredMap; |
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132 | dijkstra(G,length).predMap(myPredMap).run(s); |
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133 | } |
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134 | } |
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135 | |
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136 | int main() { |
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137 | checkDijkstra<ListDigraph>(); |
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138 | checkDijkstra<SmartDigraph>(); |
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139 | return 0; |
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140 | } |
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