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- // (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
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