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