test/bfs_test.cc
author Peter Kovacs <kpeter@inf.elte.hu>
Sat, 18 Oct 2008 13:15:00 +0200
changeset 336 052cecabcb71
parent 222 f9a18c21dba8
child 278 931190050520
permissions -rw-r--r--
Fixes and improvements related to GridGraph
     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/bfs.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   "5\n"
    40   "@arcs\n"
    41   "     label\n"
    42   "0 1  0\n"
    43   "1 2  1\n"
    44   "2 3  2\n"
    45   "3 4  3\n"
    46   "0 3  4\n"
    47   "0 3  5\n"
    48   "5 2  6\n"
    49   "@attributes\n"
    50   "source 0\n"
    51   "target 4\n";
    52 
    53 void checkBfsCompile()
    54 {
    55   typedef concepts::Digraph Digraph;
    56   typedef Bfs<Digraph> BType;
    57 
    58   Digraph G;
    59   Digraph::Node n;
    60   Digraph::Arc e;
    61   int l;
    62   bool b;
    63   BType::DistMap d(G);
    64   BType::PredMap p(G);
    65   //  BType::PredNodeMap pn(G);
    66 
    67   BType bfs_test(G);
    68 
    69   bfs_test.run(n);
    70 
    71   l  = bfs_test.dist(n);
    72   e  = bfs_test.predArc(n);
    73   n  = bfs_test.predNode(n);
    74   d  = bfs_test.distMap();
    75 
    76   p  = bfs_test.predMap();
    77   //  pn = bfs_test.predNodeMap();
    78   b  = bfs_test.reached(n);
    79 
    80   Path<Digraph> pp = bfs_test.path(n);
    81 }
    82 
    83 void checkBfsFunctionCompile()
    84 {
    85   typedef int VType;
    86   typedef concepts::Digraph Digraph;
    87   typedef Digraph::Arc Arc;
    88   typedef Digraph::Node Node;
    89 
    90   Digraph g;
    91   bfs(g,Node()).run();
    92   bfs(g).source(Node()).run();
    93   bfs(g)
    94     .predMap(concepts::WriteMap<Node,Arc>())
    95     .distMap(concepts::WriteMap<Node,VType>())
    96     .reachedMap(concepts::ReadWriteMap<Node,bool>())
    97     .processedMap(concepts::WriteMap<Node,bool>())
    98     .run(Node());
    99 }
   100 
   101 template <class Digraph>
   102 void checkBfs() {
   103   TEMPLATE_DIGRAPH_TYPEDEFS(Digraph);
   104 
   105   Digraph G;
   106   Node s, t;
   107 
   108   std::istringstream input(test_lgf);
   109   digraphReader(input, G).
   110     node("source", s).
   111     node("target", t).
   112     run();
   113 
   114   Bfs<Digraph> bfs_test(G);
   115   bfs_test.run(s);
   116 
   117   check(bfs_test.dist(t)==2,"Bfs found a wrong path." << bfs_test.dist(t));
   118 
   119   Path<Digraph> p = bfs_test.path(t);
   120   check(p.length()==2,"path() found a wrong path.");
   121   check(checkPath(G, p),"path() found a wrong path.");
   122   check(pathSource(G, p) == s,"path() found a wrong path.");
   123   check(pathTarget(G, p) == t,"path() found a wrong path.");
   124 
   125 
   126   for(ArcIt a(G); a!=INVALID; ++a) {
   127     Node u=G.source(a);
   128     Node v=G.target(a);
   129     check( !bfs_test.reached(u) ||
   130            (bfs_test.dist(v) <= bfs_test.dist(u)+1),
   131            "Wrong output." << G.id(v) << ' ' << G.id(u));
   132   }
   133 
   134   for(NodeIt v(G); v!=INVALID; ++v) {
   135     if (bfs_test.reached(v)) {
   136       check(v==s || bfs_test.predArc(v)!=INVALID, "Wrong tree.");
   137       if (bfs_test.predArc(v)!=INVALID ) {
   138         Arc a=bfs_test.predArc(v);
   139         Node u=G.source(a);
   140         check(u==bfs_test.predNode(v),"Wrong tree.");
   141         check(bfs_test.dist(v) - bfs_test.dist(u) == 1,
   142               "Wrong distance. Difference: "
   143               << std::abs(bfs_test.dist(v) - bfs_test.dist(u)
   144                           - 1));
   145       }
   146     }
   147   }
   148 }
   149 
   150 int main()
   151 {
   152   checkBfs<ListDigraph>();
   153   checkBfs<SmartDigraph>();
   154   return 0;
   155 }