1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
//=======================================================================
// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#include <boost/config.hpp>
#include <assert.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/depth_first_search.hpp>
#include <boost/graph/visitors.hpp>
/*
This calculates the discover finishing time.
Sample Output
Tree edge: 0 --> 2
Tree edge: 2 --> 1
Back edge: 1 --> 1
Tree edge: 1 --> 3
Back edge: 3 --> 1
Tree edge: 3 --> 4
Back edge: 4 --> 0
Back edge: 4 --> 1
Forward or cross edge: 2 --> 3
1 10
3 8
2 9
4 7
5 6
*/
using namespace boost;
using namespace std;
template <class VisitorList>
struct edge_categorizer : public dfs_visitor<VisitorList> {
typedef dfs_visitor<VisitorList> Base;
edge_categorizer(const VisitorList& v = null_visitor()) : Base(v) { }
template <class Edge, class Graph>
void tree_edge(Edge e, Graph& G) {
cout << "Tree edge: " << source(e, G) <<
" --> " << target(e, G) << endl;
Base::tree_edge(e, G);
}
template <class Edge, class Graph>
void back_edge(Edge e, Graph& G) {
cout << "Back edge: " << source(e, G)
<< " --> " << target(e, G) << endl;
Base::back_edge(e, G);
}
template <class Edge, class Graph>
void forward_or_cross_edge(Edge e, Graph& G) {
cout << "Forward or cross edge: " << source(e, G)
<< " --> " << target(e, G) << endl;
Base::forward_or_cross_edge(e, G);
}
};
template <class VisitorList>
edge_categorizer<VisitorList>
categorize_edges(const VisitorList& v) {
return edge_categorizer<VisitorList>(v);
}
int
main(int , char* [])
{
using namespace boost;
typedef adjacency_list<> Graph;
Graph G(5);
add_edge(0, 2, G);
add_edge(1, 1, G);
add_edge(1, 3, G);
add_edge(2, 1, G);
add_edge(2, 3, G);
add_edge(3, 1, G);
add_edge(3, 4, G);
add_edge(4, 0, G);
add_edge(4, 1, G);
typedef graph_traits<Graph>::vertex_descriptor Vertex;
typedef graph_traits<Graph>::vertices_size_type size_type;
std::vector<size_type> d(num_vertices(G));
std::vector<size_type> f(num_vertices(G));
int t = 0;
depth_first_search(G, visitor(categorize_edges(
make_pair(stamp_times(&d[0], t, on_discover_vertex()),
stamp_times(&f[0], t, on_finish_vertex())))));
std::vector<size_type>::iterator i, j;
for (i = d.begin(), j = f.begin(); i != d.end(); ++i, ++j)
cout << *i << " " << *j << endl;
return 0;
}
|
