COIN-OR::LEMON - Graph Library

source: lemon-1.2/demo/lgf_demo.cc @ 192:7bf5f97d574f

Last change on this file since 192:7bf5f97d574f was 192:7bf5f97d574f, checked in by Peter Kovacs <kpeter@…>, 12 years ago

Doc improvements in LGF related files

File size: 2.0 KB
Line 
1/* -*- C++ -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library
4 *
5 * Copyright (C) 2003-2008
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
12 *
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
15 * purpose.
16 *
17 */
18
19///\ingroup demos
20///\file
21///\brief Demonstrating graph input and output
22///
23/// This program gives an example of how to load a directed graph from
24/// an \ref lgf-format "LGF" file with the \ref lemon::DigraphReader
25/// "DigraphReader" class.
26///
27/// The \c "digraph.lgf" file:
28/// \include digraph.lgf
29///
30/// And the program which reads it:
31/// \include lgf_demo.cc
32
33#include <iostream>
34#include <lemon/smart_graph.h>
35#include <lemon/lgf_reader.h>
36#include <lemon/lgf_writer.h>
37
38using namespace lemon;
39
40int main() {
41  SmartDigraph g;
42  SmartDigraph::ArcMap<int> cap(g);
43  SmartDigraph::Node s, t;
44
45  digraphReader("digraph.lgf", g). // read the directed graph into g
46    arcMap("capacity", cap).       // read the 'capacity' arc map into cap
47    node("source", s).             // read 'source' node to s
48    node("target", t).             // read 'target' node to t
49    run();
50
51  std::cout << "A digraph is read from 'digraph.lgf'." << std::endl;
52  std::cout << "Number of nodes: " << countNodes(g) << std::endl;
53  std::cout << "Number of arcs: " << countArcs(g) << std::endl;
54
55  std::cout << "We can write it to the standard output:" << std::endl;
56
57  digraphWriter(std::cout, g).     // write g to the standard output
58    arcMap("capacity", cap).       // write cap into 'capacity'
59    node("source", s).             // write s to 'source'
60    node("target", t).             // write t to 'target'
61    run();
62
63  return 0;
64}
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