demo/lgf_demo.cc
author Alpar Juttner <alpar@cs.elte.hu>
Sat, 17 May 2008 06:30:02 +0100
changeset 156 e561aa7675de
parent 127 1c9a9e2f7d4d
child 164 00d297da491e
permissions -rw-r--r--
More flexible header names in .lgf + largely improved doc
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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 simple demo program gives an example of how to read and write
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/// a graph and additional maps (on the nodes or the edges) from/to a
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/// stream. 
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///
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/// \include reader_writer_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(int argc, const char *argv[]) {
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  const int n = argc > 1 ? std::atoi(argv[1]) : 20;
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  const int e = argc > 2 ? std::atoi(argv[2]) : static_cast<int>(n * std::log(double(n)));
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  const int m = argc > 3 ? std::atoi(argv[3]) : 100;
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  SmartDigraph digraph;
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  std::stringstream ss;
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  try {
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    typedef SmartDigraph Digraph;
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    typedef Digraph::Node Node;
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    typedef Digraph::Arc Arc;
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    typedef Digraph::ArcIt ArcIt;
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    typedef Digraph::NodeMap<int> PotentialMap;
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    typedef Digraph::ArcMap<int> CapacityMap;
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    typedef Digraph::ArcMap<std::string> NameMap;
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    Digraph digraph;
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    PotentialMap potential(digraph);
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    CapacityMap capacity(digraph);
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    NameMap name(digraph);
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    std::vector<Node> nodes;
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    for (int i = 0; i < n; ++i) {
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      Node node = digraph.addNode();
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      potential[node] = rnd[m];
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      nodes.push_back(node);
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    }
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    std::vector<Arc> arcs;
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    for (int i = 0; i < e; ++i) {
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      int s = rnd[n];
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      int t = rnd[n];
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      int c = rnd[m];
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      Arc arc = digraph.addArc(nodes[s], nodes[t]);
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      capacity[arc] = c;
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      std::ostringstream os;
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      os << "arc \t" << i << std::endl;
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      name[arc] = os.str();
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      arcs.push_back(arc);
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    }
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    DigraphWriter<Digraph>(ss, digraph).
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      nodeMap("potential", potential).
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      arcMap("capacity", capacity).
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      arcMap("name", name).
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      node("source", nodes[0]).
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      node("target", nodes[1]).
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      arc("bottleneck", arcs[e / 2]).
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      attribute("creator", "lemon library").
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      run();
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  } catch (DataFormatError& error) {
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    std::cerr << error.what() << std::endl;
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  }
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  try {
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    typedef SmartDigraph Digraph;
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    typedef Digraph::Node Node;
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    typedef Digraph::Arc Arc;
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    typedef Digraph::ArcIt ArcIt;
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    typedef Digraph::NodeMap<int> LabelMap;
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    typedef Digraph::NodeMap<int> PotentialMap;
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    typedef Digraph::ArcMap<int> CapacityMap;
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    typedef Digraph::ArcMap<std::string> NameMap;
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    Digraph digraph;
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    LabelMap label(digraph);
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    PotentialMap potential(digraph);
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    CapacityMap capacity(digraph);
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    NameMap name(digraph);
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    Node s, t;
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    Arc a;
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    std::string creator;
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    for (int i = 0; i < n; ++i) {
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      Node node = digraph.addNode();
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      label[node] = i;
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    }
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    DigraphReader<Digraph>(ss, digraph).
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      useNodes(label).
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      nodeMap("potential", potential).
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      arcMap("capacity", capacity).
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      arcMap("name", name).
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      node("source", s).
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      node("target", t).
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      arc("bottleneck", a).
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      attribute("creator", creator).
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      run();
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    DigraphWriter<Digraph>(std::cout, digraph).
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      nodeMap("potential", potential).
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      arcMap("capacity", capacity).
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      arcMap("name", name).
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      node("source", s).
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      node("target", t).
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      arc("bottleneck", a).
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      attribute("creator", creator).
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      run();
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  } catch (DataFormatError& error) {
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    std::cerr << error.what() << std::endl;
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  }
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  return 0;
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}