test/dijkstra_test.cc
author Alpar Juttner <alpar@cs.elte.hu>
Sat, 27 Sep 2008 14:04:27 +0200
changeset 284 a16cc721259e
parent 228 b6732e0d38c5
child 286 da414906fe21
permissions -rw-r--r--
Make chg-len.py independent from the global Mercurial config files
     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 #include <lemon/dijkstra.h>
    24 #include <lemon/path.h>
    25 
    26 #include "graph_test.h"
    27 #include "test_tools.h"
    28 
    29 using namespace lemon;
    30 
    31 char test_lgf[] =
    32   "@nodes\n"
    33   "label\n"
    34   "0\n"
    35   "1\n"
    36   "2\n"
    37   "3\n"
    38   "4\n"
    39   "@arcs\n"
    40   "     label length\n"
    41   "0 1  0     1\n"
    42   "1 2  1     1\n"
    43   "2 3  2     1\n"
    44   "0 3  4     5\n"
    45   "0 3  5     10\n"
    46   "0 3  6     7\n"
    47   "4 2  7     1\n"
    48   "@attributes\n"
    49   "source 0\n"
    50   "target 3\n";
    51 
    52 void checkDijkstraCompile()
    53 {
    54   typedef int VType;
    55   typedef concepts::Digraph Digraph;
    56   typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap;
    57   typedef Dijkstra<Digraph, LengthMap> DType;
    58 
    59   Digraph G;
    60   Digraph::Node n;
    61   Digraph::Arc e;
    62   VType l;
    63   bool b;
    64   DType::DistMap d(G);
    65   DType::PredMap p(G);
    66   LengthMap length;
    67 
    68   DType dijkstra_test(G,length);
    69 
    70   dijkstra_test.run(n);
    71 
    72   l  = dijkstra_test.dist(n);
    73   e  = dijkstra_test.predArc(n);
    74   n  = dijkstra_test.predNode(n);
    75   d  = dijkstra_test.distMap();
    76   p  = dijkstra_test.predMap();
    77   b  = dijkstra_test.reached(n);
    78 
    79   Path<Digraph> pp = dijkstra_test.path(n);
    80 }
    81 
    82 void checkDijkstraFunctionCompile()
    83 {
    84   typedef int VType;
    85   typedef concepts::Digraph Digraph;
    86   typedef Digraph::Arc Arc;
    87   typedef Digraph::Node Node;
    88   typedef concepts::ReadMap<Digraph::Arc,VType> LengthMap;
    89 
    90   Digraph g;
    91   bool b;
    92   dijkstra(g,LengthMap()).run(Node());
    93   b=dijkstra(g,LengthMap()).run(Node(),Node());
    94   dijkstra(g,LengthMap())
    95     .predMap(concepts::ReadWriteMap<Node,Arc>())
    96     .distMap(concepts::ReadWriteMap<Node,VType>())
    97     .processedMap(concepts::WriteMap<Node,bool>())
    98     .run(Node());
    99   b=dijkstra(g,LengthMap())
   100     .predMap(concepts::ReadWriteMap<Node,Arc>())
   101     .distMap(concepts::ReadWriteMap<Node,VType>())
   102     .processedMap(concepts::WriteMap<Node,bool>())
   103     .path(concepts::Path<Digraph>())
   104     .dist(VType())
   105     .run(Node(),Node());
   106 }
   107 
   108 template <class Digraph>
   109 void checkDijkstra() {
   110   TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
   111   typedef typename Digraph::template ArcMap<int> LengthMap;
   112 
   113   Digraph G;
   114   Node s, t;
   115   LengthMap length(G);
   116 
   117   std::istringstream input(test_lgf);
   118   digraphReader(input, G).
   119     arcMap("length", length).
   120     node("source", s).
   121     node("target", t).
   122     run();
   123 
   124   Dijkstra<Digraph, LengthMap>
   125         dijkstra_test(G, length);
   126   dijkstra_test.run(s);
   127 
   128   check(dijkstra_test.dist(t)==3,"Dijkstra found a wrong path.");
   129 
   130   Path<Digraph> p = dijkstra_test.path(t);
   131   check(p.length()==3,"path() found a wrong path.");
   132   check(checkPath(G, p),"path() found a wrong path.");
   133   check(pathSource(G, p) == s,"path() found a wrong path.");
   134   check(pathTarget(G, p) == t,"path() found a wrong path.");
   135 
   136   for(ArcIt e(G); e!=INVALID; ++e) {
   137     Node u=G.source(e);
   138     Node v=G.target(e);
   139     check( !dijkstra_test.reached(u) ||
   140            (dijkstra_test.dist(v) - dijkstra_test.dist(u) <= length[e]),
   141            "Wrong output. dist(target)-dist(source)-arc_length=" <<
   142            dijkstra_test.dist(v) - dijkstra_test.dist(u) - length[e]);
   143   }
   144 
   145   for(NodeIt v(G); v!=INVALID; ++v) {
   146     if (dijkstra_test.reached(v)) {
   147       check(v==s || dijkstra_test.predArc(v)!=INVALID, "Wrong tree.");
   148       if (dijkstra_test.predArc(v)!=INVALID ) {
   149         Arc e=dijkstra_test.predArc(v);
   150         Node u=G.source(e);
   151         check(u==dijkstra_test.predNode(v),"Wrong tree.");
   152         check(dijkstra_test.dist(v) - dijkstra_test.dist(u) == length[e],
   153               "Wrong distance! Difference: " <<
   154               std::abs(dijkstra_test.dist(v)-dijkstra_test.dist(u)-length[e]));
   155       }
   156     }
   157   }
   158 
   159   {
   160     NullMap<Node,Arc> myPredMap;
   161     dijkstra(G,length).predMap(myPredMap).run(s);
   162   }
   163 }
   164 
   165 int main() {
   166   checkDijkstra<ListDigraph>();
   167   checkDijkstra<SmartDigraph>();
   168   return 0;
   169 }