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/* -*- mode: C++; indent-tabs-mode: nil; -*-
*
* This file is a part of LEMON, a generic C++ optimization library.
*
* Copyright (C) 2003-2009
* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
* (Egervary Research Group on Combinatorial Optimization, EGRES).
*
* Permission to use, modify and distribute this software is granted
* provided that this copyright notice appears in all copies. For
* precise terms see the accompanying LICENSE file.
*
* This software is provided "AS IS" with no warranty of any kind,
* express or implied, and with no claim as to its suitability for any
* purpose.
*
*/
///\ingroup demos
///\file
///\brief Demonstrating graph input and output
///
/// This program gives an example of how to read and write a digraph
/// and additional maps from/to a stream or a file using the
/// \ref lgf-format "LGF" format.
///
/// The \c "digraph.lgf" file:
/// \include digraph.lgf
///
/// And the program which reads it and prints the digraph to the
/// standard output:
/// \include lgf_demo.cc
#include <iostream>
#include <lemon/smart_graph.h>
#include <lemon/lgf_reader.h>
#include <lemon/lgf_writer.h>
using namespace lemon;
int main() {
SmartDigraph g;
SmartDigraph::ArcMap<int> cap(g);
SmartDigraph::Node s, t;
try {
digraphReader(g, "digraph.lgf"). // read the directed graph into g
arcMap("capacity", cap). // read the 'capacity' arc map into cap
node("source", s). // read 'source' node to s
node("target", t). // read 'target' node to t
run();
} catch (Exception& error) { // check if there was any error
std::cerr << "Error: " << error.what() << std::endl;
return -1;
}
std::cout << "A digraph is read from 'digraph.lgf'." << std::endl;
std::cout << "Number of nodes: " << countNodes(g) << std::endl;
std::cout << "Number of arcs: " << countArcs(g) << std::endl;
std::cout << "We can write it to the standard output:" << std::endl;
digraphWriter(g). // write g to the standard output
arcMap("capacity", cap). // write cap into 'capacity'
node("source", s). // write s to 'source'
node("target", t). // write t to 'target'
run();
return 0;
}
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