COIN-OR::LEMON - Graph Library

source: lemon-0.x/test/dijkstra_test.cc @ 1955:daca31868d70

Last change on this file since 1955:daca31868d70 was 1875:98698b69a902, checked in by Alpar Juttner, 14 years ago

Happy new year to LEMON

File size: 3.8 KB
Line 
1/* -*- C++ -*-
2 * test/dijkstra_test.cc - Part of LEMON, a generic C++ optimization library
3 *
4 * Copyright (C) 2006 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
5 * (Egervary Research Group on Combinatorial Optimization, EGRES).
6 *
7 * Permission to use, modify and distribute this software is granted
8 * provided that this copyright notice appears in all copies. For
9 * precise terms see the accompanying LICENSE file.
10 *
11 * This software is provided "AS IS" with no warranty of any kind,
12 * express or implied, and with no claim as to its suitability for any
13 * purpose.
14 *
15 */
16
17#include "test_tools.h"
18#include <lemon/smart_graph.h>
19#include <lemon/dijkstra.h>
20#include <lemon/path.h>
21#include <lemon/maps.h>
22#include <lemon/concept/graph.h>
23#include <lemon/concept/maps.h>
24using namespace lemon;
25
26const int PET_SIZE =5;
27
28
29void check_Dijkstra_BinHeap_Compile()
30{
31  typedef int VType;
32  typedef concept::StaticGraph Graph;
33
34  typedef Graph::Edge Edge;
35  typedef Graph::Node Node;
36  typedef Graph::EdgeIt EdgeIt;
37  typedef Graph::NodeIt NodeIt;
38  typedef concept::ReadMap<Edge,VType> LengthMap;
39 
40  typedef Dijkstra<Graph, LengthMap> DType;
41 
42  Graph G;
43  Node n;
44  Edge e;
45  VType l;
46  bool b;
47  DType::DistMap d(G);
48  DType::PredMap p(G);
49  //  DType::PredNodeMap pn(G);
50  LengthMap cap;
51
52  DType dijkstra_test(G,cap);
53
54  dijkstra_test.run(n);
55
56  l  = dijkstra_test.dist(n);
57  e  = dijkstra_test.predEdge(n);
58  n  = dijkstra_test.predNode(n);
59  d  = dijkstra_test.distMap();
60  p  = dijkstra_test.predMap();
61  //  pn = dijkstra_test.predNodeMap();
62  b  = dijkstra_test.reached(n);
63
64  DirPath<Graph> pp(G);
65  dijkstra_test.getPath(pp,n);
66}
67
68void check_Dijkstra_Function_Compile()
69{
70  typedef int VType;
71  typedef concept::StaticGraph Graph;
72
73  typedef Graph::Edge Edge;
74  typedef Graph::Node Node;
75  typedef Graph::EdgeIt EdgeIt;
76  typedef Graph::NodeIt NodeIt;
77  typedef concept::ReadMap<Edge,VType> LengthMap;
78   
79  dijkstra(Graph(),LengthMap(),Node()).run();
80  dijkstra(Graph(),LengthMap()).source(Node()).run();
81  dijkstra(Graph(),LengthMap())
82    .predMap(concept::WriteMap<Node,Edge>())
83    .distMap(concept::WriteMap<Node,VType>())
84    .run(Node());
85 
86}
87
88
89int main()
90{
91   
92  typedef SmartGraph Graph;
93
94  typedef Graph::Edge Edge;
95  typedef Graph::Node Node;
96  typedef Graph::EdgeIt EdgeIt;
97  typedef Graph::NodeIt NodeIt;
98  typedef Graph::EdgeMap<int> LengthMap;
99
100  Graph G;
101  Node s, t;
102  LengthMap cap(G);
103  PetStruct<Graph> ps = addPetersen(G,PET_SIZE);
104   
105  for(int i=0;i<PET_SIZE;i++) {
106    cap[ps.outcir[i]]=4;
107    cap[ps.incir[i]]=1;
108    cap[ps.chords[i]]=10;
109  }
110  s=ps.outer[0];
111  t=ps.inner[1];
112 
113  Dijkstra<Graph, LengthMap>
114        dijkstra_test(G, cap);
115  dijkstra_test.run(s);
116 
117  check(dijkstra_test.dist(t)==13,"Dijkstra found a wrong path.");
118
119
120  DirPath<Graph> p(G);
121  check(dijkstra_test.getPath(p,t),"getPath() failed to set the path.");
122  check(p.length()==4,"getPath() found a wrong path.");
123 
124
125  for(EdgeIt e(G); e!=INVALID; ++e) {
126    Node u=G.source(e);
127    Node v=G.target(e);
128    check( !dijkstra_test.reached(u) ||
129           (dijkstra_test.dist(v) - dijkstra_test.dist(u) <= cap[e]),
130           "dist(target)-dist(source)- edge_length= "
131           << dijkstra_test.dist(v) - dijkstra_test.dist(u)
132           - cap[e]);
133  }
134
135  ///\bug This works only for integer lengths
136  for(NodeIt v(G); v!=INVALID; ++v){
137    check(dijkstra_test.reached(v),"Each node should be reached.");
138    if ( dijkstra_test.predEdge(v)!=INVALID ) {
139      Edge e=dijkstra_test.predEdge(v);
140      Node u=G.source(e);
141      check(u==dijkstra_test.predNode(v),"Wrong tree.");
142      check(dijkstra_test.dist(v) - dijkstra_test.dist(u) == cap[e],
143            "Wrong distance! Difference: "
144            << std::abs(dijkstra_test.dist(v) - dijkstra_test.dist(u)
145                            - cap[e]));
146    }
147  }
148
149 
150  {
151    NullMap<Node,Edge> myPredMap;
152    dijkstra(G,cap).predMap(myPredMap).run(s);
153  }
154  return 0;
155}
Note: See TracBrowser for help on using the repository browser.