demo/hello_world.cc
author deba
Tue, 31 Oct 2006 14:27:58 +0000
changeset 2282 9d7b12f83daa
parent 2195 f47faf6913ab
child 2391 14a343be7a5a
permissions -rw-r--r--
Bug fixes
     1 /* -*- C++ -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library
     4  *
     5  * Copyright (C) 2003-2006
     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 ///\ingroup demos
    20 ///\file
    21 ///\brief LEMON style "Hello World!" program
    22 ///
    23 /// This program is intended to be a "Hello World!" program that shows
    24 /// the very basic notions of the LEMON library: \ref graphs "graphs" and
    25 /// \ref maps-page "maps". Click on the links to read more about these.
    26 ///
    27 /// \include hello_lemon.cc
    28 
    29 #include <iostream>
    30 #include <lemon/list_graph.h>
    31 
    32 using namespace lemon;
    33 
    34 typedef ListGraph::Node  Node;
    35 typedef ListGraph::Edge  Edge;
    36 
    37 
    38 int main()
    39 {
    40   // Declare the graph itself and a NodeMap, witch will store the characters
    41   // assigned to the nodes
    42   ListGraph  graph;
    43   ListGraph::NodeMap<char>  char_map(graph);
    44 
    45   // Add nodes
    46   Node  new_node = graph.addNode();
    47   char_map[new_node] = 'H';
    48 
    49   // Store the start node
    50   Node  start_node = new_node;
    51 
    52   Node  from_node = new_node;
    53   new_node = graph.addNode();
    54   char_map[new_node] = 'e';
    55 
    56   // Here we add the first edge...
    57   graph.addEdge( from_node, new_node );
    58 
    59   // ... and we add some more nodes and edges to the graph
    60   from_node = new_node;
    61   new_node = graph.addNode();
    62   char_map[new_node] = 'l';
    63   graph.addEdge( from_node, new_node );
    64 
    65   from_node = new_node;
    66   new_node = graph.addNode();
    67   char_map[new_node] = 'l';
    68   graph.addEdge( from_node, new_node );
    69 
    70   from_node = new_node;
    71   new_node = graph.addNode();
    72   char_map[new_node] = 'o';
    73   graph.addEdge( from_node, new_node );
    74 
    75   from_node = new_node;
    76   new_node = graph.addNode();
    77   char_map[new_node] = ' ';
    78   graph.addEdge( from_node, new_node );
    79 
    80   from_node = new_node;
    81   new_node = graph.addNode();
    82   char_map[new_node] = 'W';
    83   graph.addEdge( from_node, new_node );
    84 
    85   from_node = new_node;
    86   new_node = graph.addNode();
    87   char_map[new_node] = 'o';
    88   graph.addEdge( from_node, new_node );
    89 
    90   from_node = new_node;
    91   new_node = graph.addNode();
    92   char_map[new_node] = 'r';
    93   graph.addEdge( from_node, new_node );
    94 
    95   from_node = new_node;
    96   new_node = graph.addNode();
    97   char_map[new_node] = 'l';
    98   graph.addEdge( from_node, new_node );
    99 
   100   from_node = new_node;
   101   new_node = graph.addNode();
   102   char_map[new_node] = 'd';
   103   graph.addEdge( from_node, new_node );
   104 
   105   from_node = new_node;
   106   new_node = graph.addNode();
   107   char_map[new_node] = '\n';
   108   graph.addEdge( from_node, new_node );
   109 
   110 
   111   // iterating
   112   Node  current_node = start_node;
   113   while( current_node != INVALID )
   114   {
   115     std::cout << char_map[current_node] << std::flush;
   116 
   117     ListGraph::OutEdgeIt  edge(graph, current_node);
   118     if( edge != INVALID )
   119       current_node = graph.target( edge );
   120     else
   121       current_node = INVALID;
   122   }
   123   
   124   return 0;
   125 }