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
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/* -*- C++ -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library
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 *
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 * Copyright (C) 2003-2006
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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///\ingroup demos
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///\file
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///\brief LEMON style "Hello World!" program
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///
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/// This program is intended to be a "Hello World!" program that shows
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/// the very basic notions of the LEMON library: \ref graphs "graphs" and
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/// \ref maps-page "maps". Click on the links to read more about these.
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///
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/// \include hello_lemon.cc
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#include <iostream>
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#include <lemon/list_graph.h>
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using namespace lemon;
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typedef ListGraph::Node  Node;
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typedef ListGraph::Edge  Edge;
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int main()
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{
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  // Declare the graph itself and a NodeMap, witch will store the characters
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  // assigned to the nodes
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  ListGraph  graph;
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  ListGraph::NodeMap<char>  char_map(graph);
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  // Add nodes
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  Node  new_node = graph.addNode();
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  char_map[new_node] = 'H';
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  // Store the start node
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  Node  start_node = new_node;
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  Node  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'e';
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  // Here we add the first edge...
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  graph.addEdge( from_node, new_node );
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  // ... and we add some more nodes and edges to the graph
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'l';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'l';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'o';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = ' ';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'W';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'o';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'r';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'l';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = 'd';
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  graph.addEdge( from_node, new_node );
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  from_node = new_node;
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  new_node = graph.addNode();
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  char_map[new_node] = '\n';
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  graph.addEdge( from_node, new_node );
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  // iterating
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  Node  current_node = start_node;
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  while( current_node != INVALID )
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  {
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    std::cout << char_map[current_node] << std::flush;
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    ListGraph::OutEdgeIt  edge(graph, current_node);
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    if( edge != INVALID )
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      current_node = graph.target( edge );
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    else
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      current_node = INVALID;
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  }
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  return 0;
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}