110 lines
3.5 KiB
Plaintext
110 lines
3.5 KiB
Plaintext
// Copyright (C) 2005-2006 The Trustees of Indiana University.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Authors: Jeremiah Willcock
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// Douglas Gregor
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// Andrew Lumsdaine
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// Two bit per color property map
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#ifndef BOOST_TWO_BIT_COLOR_MAP_HPP
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#define BOOST_TWO_BIT_COLOR_MAP_HPP
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#include <boost/property_map/property_map.hpp>
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#include <boost/graph/properties.hpp>
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#include <boost/shared_array.hpp>
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#include <boost/config.hpp>
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#include <boost/assert.hpp>
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#include <algorithm>
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#include <limits>
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namespace boost {
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enum two_bit_color_type {
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two_bit_white = 0,
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two_bit_gray = 1,
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two_bit_green = 2,
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two_bit_black = 3
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};
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template <>
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struct color_traits<two_bit_color_type>
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{
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static two_bit_color_type white() { return two_bit_white; }
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static two_bit_color_type gray() { return two_bit_gray; }
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static two_bit_color_type green() { return two_bit_green; }
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static two_bit_color_type black() { return two_bit_black; }
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};
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template<typename IndexMap = identity_property_map>
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struct two_bit_color_map
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{
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std::size_t n;
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IndexMap index;
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shared_array<unsigned char> data;
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BOOST_STATIC_CONSTANT(int, bits_per_char = std::numeric_limits<unsigned char>::digits);
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BOOST_STATIC_CONSTANT(int, elements_per_char = bits_per_char / 2);
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typedef typename property_traits<IndexMap>::key_type key_type;
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typedef two_bit_color_type value_type;
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typedef void reference;
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typedef read_write_property_map_tag category;
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explicit two_bit_color_map(std::size_t n, const IndexMap& index = IndexMap())
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: n(n), index(index), data(new unsigned char[(n + elements_per_char - 1) / elements_per_char])
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{
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// Fill to white
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std::fill(data.get(), data.get() + (n + elements_per_char - 1) / elements_per_char, 0);
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}
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};
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template<typename IndexMap>
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inline two_bit_color_type
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get(const two_bit_color_map<IndexMap>& pm,
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typename property_traits<IndexMap>::key_type key)
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{
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BOOST_STATIC_CONSTANT(int, elements_per_char = two_bit_color_map<IndexMap>::elements_per_char);
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typename property_traits<IndexMap>::value_type i = get(pm.index, key);
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BOOST_ASSERT ((std::size_t)i < pm.n);
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std::size_t byte_num = i / elements_per_char;
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std::size_t bit_position = ((i % elements_per_char) * 2);
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return two_bit_color_type((pm.data.get()[byte_num] >> bit_position) & 3);
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}
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template<typename IndexMap>
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inline void
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put(const two_bit_color_map<IndexMap>& pm,
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typename property_traits<IndexMap>::key_type key,
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two_bit_color_type value)
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{
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BOOST_STATIC_CONSTANT(int, elements_per_char = two_bit_color_map<IndexMap>::elements_per_char);
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typename property_traits<IndexMap>::value_type i = get(pm.index, key);
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BOOST_ASSERT ((std::size_t)i < pm.n);
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BOOST_ASSERT (value >= 0 && value < 4);
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std::size_t byte_num = i / elements_per_char;
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std::size_t bit_position = ((i % elements_per_char) * 2);
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pm.data.get()[byte_num] =
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(unsigned char)
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((pm.data.get()[byte_num] & ~(3 << bit_position))
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| (value << bit_position));
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}
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template<typename IndexMap>
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inline two_bit_color_map<IndexMap>
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make_two_bit_color_map(std::size_t n, const IndexMap& index_map)
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{
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return two_bit_color_map<IndexMap>(n, index_map);
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}
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} // end namespace boost
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#endif // BOOST_TWO_BIT_COLOR_MAP_HPP
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#ifdef BOOST_GRAPH_USE_MPI
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# include <boost/graph/distributed/two_bit_color_map.hpp>
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#endif
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