1 | /* -*- C++ -*- |
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2 | * |
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3 | * This file is a part of LEMON, a generic C++ optimization library |
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4 | * |
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5 | * Copyright (C) 2003-2008 |
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6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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8 | * |
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9 | * Permission to use, modify and distribute this software is granted |
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10 | * provided that this copyright notice appears in all copies. For |
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11 | * precise terms see the accompanying LICENSE file. |
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12 | * |
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13 | * This software is provided "AS IS" with no warranty of any kind, |
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14 | * express or implied, and with no claim as to its suitability for any |
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15 | * purpose. |
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16 | * |
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17 | */ |
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18 | |
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19 | ///\ingroup demos |
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20 | ///\file |
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21 | ///\brief Demonstrating graph input and output |
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22 | /// |
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23 | /// This program gives an example of how to load a directed graph from |
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24 | /// an \ref lgf-format "LGF" file with the \ref lemon::DigraphReader |
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25 | /// "DigraphReader" class. |
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26 | /// |
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27 | /// The \c "digraph.lgf" file: |
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28 | /// \include digraph.lgf |
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29 | /// |
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30 | /// And the program which reads it: |
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31 | /// \include lgf_demo.cc |
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32 | |
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33 | #include <iostream> |
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34 | #include <lemon/smart_graph.h> |
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35 | #include <lemon/lgf_reader.h> |
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36 | #include <lemon/lgf_writer.h> |
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37 | |
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38 | using namespace lemon; |
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39 | |
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40 | int main() { |
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41 | SmartDigraph g; |
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42 | SmartDigraph::ArcMap<int> cap(g); |
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43 | SmartDigraph::Node s, t; |
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44 | |
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45 | digraphReader("digraph.lgf", g). // read the directed graph into g |
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46 | arcMap("capacity", cap). // read the 'capacity' arc map into cap |
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47 | node("source", s). // read 'source' node to s |
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48 | node("target", t). // read 'target' node to t |
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49 | run(); |
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50 | |
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51 | std::cout << "A digraph is read from 'digraph.lgf'." << std::endl; |
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52 | std::cout << "Number of nodes: " << countNodes(g) << std::endl; |
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53 | std::cout << "Number of arcs: " << countArcs(g) << std::endl; |
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54 | |
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55 | std::cout << "We can write it to the standard output:" << std::endl; |
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56 | |
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57 | digraphWriter(std::cout, g). // write g to the standard output |
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58 | arcMap("capacity", cap). // write cap into 'capacity' |
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59 | node("source", s). // write s to 'source' |
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60 | node("target", t). // write t to 'target' |
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61 | run(); |
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62 | |
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63 | return 0; |
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64 | } |
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