demo/lgf_demo.cc
author Alpar Juttner <alpar@cs.elte.hu>
Wed, 18 Jun 2008 13:07:18 +0100
changeset 181 e34570db81ea
parent 143 c3b45bb643b0
child 191 abc5b9d0c67e
child 192 7bf5f97d574f
permissions -rw-r--r--
Doc improvements in LgfContents
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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) 2003-2008
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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 Demonstrating graph input and output
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///
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/// This program gives an example of how to load a directed graph from
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/// an \ref lgf-format "LGF" file with the \ref lemon::DigraphReader
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/// "DigraphReader" class.
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///
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/// The \c "digraph.lgf" file:
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/// \include digraph.lgf
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///
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/// And the program which reads it:
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/// \include lgf_demo.cc
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#include <iostream>
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#include <lemon/smart_graph.h>
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#include <lemon/lgf_reader.h>
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#include <lemon/lgf_writer.h>
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#include <lemon/random.h>
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using namespace lemon;
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int main() {
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  SmartDigraph g;
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  SmartDigraph::ArcMap<int> cap(g);
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  SmartDigraph::Node s, t;
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  digraphReader("digraph.lgf", g). // read the directeg graph into g
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    arcMap("capacity", cap).       // read the 'capacity' arc map into cap
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    node("source", s).             // read 'source' node to s
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    node("target", t).             // read 'target' node to t
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    run();
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  std::cout << "Digraph read from 'digraph.lgf'" << std::endl;
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  std::cout << "Number of nodes: " << countNodes(g) << std::endl;
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  std::cout << "Number of arcs: " << countArcs(g) << std::endl;
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  std::cout << "We can write it to the standard output:" << std::endl;
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  digraphWriter(std::cout, g).     // write g to the standard output
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    arcMap("capacity", cap).       // write cap into 'capacity'
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    node("source", s).             // write s to 'source'
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    node("target", t).             // write t to 'target'
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    run();
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  return 0;
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}