69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
// (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
|