| 1 | // Copyright (c) Jeremy Siek 2001, Marc Wintermantel 2002 |
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| 2 | // |
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| 3 | // Distributed under the Boost Software License, Version 1.0. (See |
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| 4 | // accompanying file LICENSE_1_0.txt or copy at |
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| 5 | // http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | |
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| 7 | #ifndef BOOST_GRAPH_BANDWIDTH_HPP |
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| 8 | #define BOOST_GRAPH_BANDWIDTH_HPP |
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| 9 | |
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| 10 | #include <algorithm> // for std::min and std::max |
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| 11 | #include <boost/config.hpp> |
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| 12 | #include <boost/graph/graph_traits.hpp> |
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| 13 | #include <boost/detail/numeric_traits.hpp> |
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| 14 | |
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| 15 | namespace boost { |
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| 16 | |
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| 17 | template <typename Graph, typename VertexIndexMap> |
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| 18 | typename graph_traits<Graph>::vertices_size_type |
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| 19 | ith_bandwidth(typename graph_traits<Graph>::vertex_descriptor i, |
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| 20 | const Graph& g, |
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| 21 | VertexIndexMap index) |
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| 22 | { |
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| 23 | BOOST_USING_STD_MAX(); |
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| 24 | typedef typename graph_traits<Graph>::vertices_size_type size_type; |
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| 25 | size_type b = 0; |
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| 26 | typename graph_traits<Graph>::out_edge_iterator e, end; |
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| 27 | for (tie(e, end) = out_edges(i, g); e != end; ++e) { |
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| 28 | int f_i = get(index, i); |
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| 29 | int f_j = get(index, target(*e, g)); |
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| 30 | using namespace std; // to call abs() unqualified |
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| 31 | if(f_i > f_j) |
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| 32 | b = max BOOST_PREVENT_MACRO_SUBSTITUTION (b, size_type(f_i - f_j)); |
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| 33 | } |
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| 34 | return b; |
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| 35 | } |
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| 36 | |
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| 37 | template <typename Graph> |
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| 38 | typename graph_traits<Graph>::vertices_size_type |
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| 39 | ith_bandwidth(typename graph_traits<Graph>::vertex_descriptor i, |
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| 40 | const Graph& g) |
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| 41 | { |
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| 42 | return ith_bandwidth(i, g, get(vertex_index, g)); |
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| 43 | } |
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| 44 | |
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| 45 | template <typename Graph, typename VertexIndexMap> |
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| 46 | typename graph_traits<Graph>::vertices_size_type |
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| 47 | bandwidth(const Graph& g, VertexIndexMap index) |
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| 48 | { |
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| 49 | BOOST_USING_STD_MAX(); |
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| 50 | typename graph_traits<Graph>::vertices_size_type b = 0; |
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| 51 | typename graph_traits<Graph>::vertex_iterator i, end; |
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| 52 | for (tie(i, end) = vertices(g); i != end; ++i) |
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| 53 | b = max BOOST_PREVENT_MACRO_SUBSTITUTION (b, ith_bandwidth(*i, g, index)); |
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| 54 | return b; |
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| 55 | } |
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| 56 | |
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| 57 | template <typename Graph> |
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| 58 | typename graph_traits<Graph>::vertices_size_type |
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| 59 | bandwidth(const Graph& g) |
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| 60 | { |
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| 61 | return bandwidth(g, get(vertex_index, g)); |
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| 62 | } |
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| 63 | |
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| 64 | template <typename Graph, typename VertexIndexMap> |
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| 65 | typename graph_traits<Graph>::vertices_size_type |
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| 66 | edgesum(const Graph& g, VertexIndexMap index_map) |
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| 67 | { |
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| 68 | typedef typename graph_traits<Graph>::vertices_size_type size_type; |
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| 69 | typedef typename detail::numeric_traits<size_type>::difference_type diff_t; |
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| 70 | size_type sum = 0; |
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| 71 | typename graph_traits<Graph>::edge_iterator i, end; |
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| 72 | for (tie(i, end) = edges(g); i != end; ++i) { |
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| 73 | diff_t f_u = get(index_map, source(*i, g)); |
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| 74 | diff_t f_v = get(index_map, target(*i, g)); |
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| 75 | using namespace std; // to call abs() unqualified |
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| 76 | sum += abs(f_u - f_v); |
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| 77 | } |
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| 78 | return sum; |
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| 79 | } |
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| 80 | |
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| 81 | } // namespace boost |
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| 82 | |
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| 83 | #endif // BOOST_GRAPH_BANDWIDTH_HPP |
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