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
|
// (C) Copyright 2007-2009 Andrew Sutton
//
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0 (See accompanying file
// LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GRAPH_MATRIX_PROPERTY_MAP_HPP
#define BOOST_GRAPH_MATRIX_PROPERTY_MAP_HPP
#include <boost/graph/property_maps/container_property_map.hpp>
namespace boost
{
// This property map is built specifically for property maps over
// matrices. Like the basic property map over a container, this builds
// the property abstraction over a matrix (usually a vector of vectors)
// and returns property maps over the nested containers.
template <typename Graph, typename Key, typename Matrix>
struct matrix_property_map
: boost::put_get_helper<
container_property_map<Graph, Key, typename Matrix::value_type>,
matrix_property_map<Graph, Key, Matrix> >
{
// abstract the indexing keys
typedef typename detail::choose_indexer<Graph, Key>::indexer_type indexer_type;
// aliases for the nested container and its corresponding map
typedef typename Matrix::value_type container_type;
typedef container_property_map<Graph, Key, container_type> map_type;
typedef Key key_type;
// This property map doesn't really provide access to nested containers,
// but returns property maps over them. Since property maps are all
// copy-constructible (or should be anyways), we never return references.
// As such, this property is only readable, but not writable. Curiously,
// the inner property map is actually an lvalue pmap.
typedef map_type value_type;
typedef map_type reference;
typedef readable_property_map_tag category;
matrix_property_map()
: m_matrix(0), m_graph(0)
{ }
matrix_property_map(Matrix& m, const Graph& g)
: m_matrix(&m), m_graph(const_cast<Graph*>(&g))
{ }
matrix_property_map(const matrix_property_map& x)
: m_matrix(x.m_matrix), m_graph(x.m_graph)
{ }
inline reference operator [](key_type k) const
{
typedef typename indexer_type::value_type Index;
Index x = indexer_type::index(k, *m_graph);
return map_type((*m_matrix)[x], *m_graph);
}
private:
mutable Matrix* m_matrix;
mutable Graph* m_graph;
};
}
#endif
|
