test/dijkstra_test.cc
author Alpar Juttner <alpar@cs.elte.hu>
Tue, 09 Sep 2008 20:52:45 +0100
changeset 258 0310c8984732
parent 220 a5d8c039f218
child 278 931190050520
permissions -rw-r--r--
Merge
     1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library.
     4  *
     5  * Copyright (C) 2003-2008
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
     8  *
     9  * Permission to use, modify and distribute this software is granted
    10  * provided that this copyright notice appears in all copies. For
    11  * precise terms see the accompanying LICENSE file.
    12  *
    13  * This software is provided "AS IS" with no warranty of any kind,
    14  * express or implied, and with no claim as to its suitability for any
    15  * purpose.
    16  *
    17  */
    18 
    19 #include <lemon/concepts/digraph.h>
    20 #include <lemon/smart_graph.h>
    21 #include <lemon/list_graph.h>
    22 #include <lemon/lgf_reader.h>
    23 
    24 #include <lemon/dijkstra.h>
    25 #include <lemon/path.h>
    26 
    27 #include "graph_test.h"
    28 #include "test_tools.h"
    29 
    30 using namespace lemon;
    31 
    32 char test_lgf[] =
    33   "@nodes\n"
    34   "label\n"
    35   "0\n"
    36   "1\n"
    37   "2\n"
    38   "3\n"
    39   "4\n"
    40   "@arcs\n"
    41   "     label length\n"
    42   "0 1  0     1\n"
    43   "1 2  1     1\n"
    44   "2 3  2     1\n"
    45   "0 3  4     5\n"
    46   "0 3  5     10\n"
    47   "0 3  6     7\n"
    48   "4 2  7     1\n"
    49   "@attributes\n"
    50   "source 0\n"
    51   "target 3\n";
    52 
    53 void checkDijkstraCompile()
    54 {
    55   typedef int VType;
    56   typedef concepts::Digraph Digraph;
    57   typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap;
    58   typedef Dijkstra<Digraph, LengthMap> DType;
    59 
    60   Digraph G;
    61   Digraph::Node n;
    62   Digraph::Arc e;
    63   VType l;
    64   bool b;
    65   DType::DistMap d(G);
    66   DType::PredMap p(G);
    67   //  DType::PredNodeMap pn(G);
    68   LengthMap length;
    69 
    70   DType dijkstra_test(G,length);
    71 
    72   dijkstra_test.run(n);
    73 
    74   l  = dijkstra_test.dist(n);
    75   e  = dijkstra_test.predArc(n);
    76   n  = dijkstra_test.predNode(n);
    77   d  = dijkstra_test.distMap();
    78   p  = dijkstra_test.predMap();
    79   //  pn = dijkstra_test.predNodeMap();
    80   b  = dijkstra_test.reached(n);
    81 
    82   Path<Digraph> pp = dijkstra_test.path(n);
    83 }
    84 
    85 void checkDijkstraFunctionCompile()
    86 {
    87   typedef int VType;
    88   typedef concepts::Digraph Digraph;
    89   typedef Digraph::Arc Arc;
    90   typedef Digraph::Node Node;
    91   typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap;
    92 
    93   Digraph g;
    94   dijkstra(g,LengthMap(),Node()).run();
    95   dijkstra(g,LengthMap()).source(Node()).run();
    96   dijkstra(g,LengthMap())
    97     .predMap(concepts::WriteMap<Node,Arc>())
    98     .distMap(concepts::WriteMap<Node,VType>())
    99     .run(Node());
   100 }
   101 
   102 template <class Digraph>
   103 void checkDijkstra() {
   104   TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
   105   typedef typename Digraph::template ArcMap<int> LengthMap;
   106 
   107   Digraph G;
   108   Node s, t;
   109   LengthMap length(G);
   110 
   111   std::istringstream input(test_lgf);
   112   digraphReader(input, G).
   113     arcMap("length", length).
   114     node("source", s).
   115     node("target", t).
   116     run();
   117 
   118   Dijkstra<Digraph, LengthMap>
   119         dijkstra_test(G, length);
   120   dijkstra_test.run(s);
   121 
   122   check(dijkstra_test.dist(t)==3,"Dijkstra found a wrong path.");
   123 
   124   Path<Digraph> p = dijkstra_test.path(t);
   125   check(p.length()==3,"getPath() found a wrong path.");
   126   check(checkPath(G, p),"path() found a wrong path.");
   127   check(pathSource(G, p) == s,"path() found a wrong path.");
   128   check(pathTarget(G, p) == t,"path() found a wrong path.");
   129 
   130   for(ArcIt e(G); e!=INVALID; ++e) {
   131     Node u=G.source(e);
   132     Node v=G.target(e);
   133     check( !dijkstra_test.reached(u) ||
   134            (dijkstra_test.dist(v) - dijkstra_test.dist(u) <= length[e]),
   135            "dist(target)-dist(source)-arc_length= " <<
   136            dijkstra_test.dist(v) - dijkstra_test.dist(u) - length[e]);
   137   }
   138 
   139   for(NodeIt v(G); v!=INVALID; ++v) {
   140     if (dijkstra_test.reached(v)) {
   141       check(v==s || dijkstra_test.predArc(v)!=INVALID, "Wrong tree.");
   142       if (dijkstra_test.predArc(v)!=INVALID ) {
   143         Arc e=dijkstra_test.predArc(v);
   144         Node u=G.source(e);
   145         check(u==dijkstra_test.predNode(v),"Wrong tree.");
   146         check(dijkstra_test.dist(v) - dijkstra_test.dist(u) == length[e],
   147               "Wrong distance! Difference: " <<
   148               std::abs(dijkstra_test.dist(v)-dijkstra_test.dist(u)-length[e]));
   149       }
   150     }
   151   }
   152 
   153   {
   154     NullMap<Node,Arc> myPredMap;
   155     dijkstra(G,length).predMap(myPredMap).run(s);
   156   }
   157 }
   158 
   159 int main() {
   160   checkDijkstra<ListDigraph>();
   161   checkDijkstra<SmartDigraph>();
   162   return 0;
   163 }