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132 lines
4.2 KiB
C++
132 lines
4.2 KiB
C++
// (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_DEGREE_CENTRALITY_HPP
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#define BOOST_GRAPH_DEGREE_CENTRALITY_HPP
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#include <boost/graph/graph_concepts.hpp>
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#include <boost/concept/assert.hpp>
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namespace boost {
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template <typename Graph>
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struct degree_centrality_measure
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{
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typedef typename graph_traits<Graph>::degree_size_type degree_type;
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typedef typename graph_traits<Graph>::vertex_descriptor vertex_type;
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};
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template <typename Graph>
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struct influence_measure
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: public degree_centrality_measure<Graph>
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{
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typedef degree_centrality_measure<Graph> base_type;
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typedef typename base_type::degree_type degree_type;
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typedef typename base_type::vertex_type vertex_type;
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inline degree_type operator ()(vertex_type v, const Graph& g)
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{
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BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept<Graph> ));
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return out_degree(v, g);
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}
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};
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template <typename Graph>
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inline influence_measure<Graph>
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measure_influence(const Graph&)
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{ return influence_measure<Graph>(); }
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template <typename Graph>
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struct prestige_measure
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: public degree_centrality_measure<Graph>
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{
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typedef degree_centrality_measure<Graph> base_type;
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typedef typename base_type::degree_type degree_type;
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typedef typename base_type::vertex_type vertex_type;
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inline degree_type operator ()(vertex_type v, const Graph& g)
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{
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BOOST_CONCEPT_ASSERT(( BidirectionalGraphConcept<Graph> ));
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return in_degree(v, g);
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}
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};
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template <typename Graph>
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inline prestige_measure<Graph>
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measure_prestige(const Graph&)
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{ return prestige_measure<Graph>(); }
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template <typename Graph, typename Vertex, typename Measure>
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inline typename Measure::degree_type
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degree_centrality(const Graph& g, Vertex v, Measure measure)
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{
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BOOST_CONCEPT_ASSERT(( DegreeMeasureConcept<Measure, Graph> ));
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return measure(v, g);
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}
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template <typename Graph, typename Vertex>
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inline typename graph_traits<Graph>::degree_size_type
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degree_centrality(const Graph& g, Vertex v)
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{
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return degree_centrality(g, v, measure_influence(g));
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}
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// These are alias functions, intended to provide a more expressive interface.
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template <typename Graph, typename Vertex>
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inline typename graph_traits<Graph>::degree_size_type
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influence(const Graph& g, Vertex v)
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{ return degree_centrality(g, v, measure_influence(g)); }
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template <typename Graph, typename Vertex>
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inline typename graph_traits<Graph>::degree_size_type
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prestige(const Graph& g, Vertex v)
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{ return degree_centrality(g, v, measure_prestige(g)); }
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template <typename Graph, typename CentralityMap, typename Measure>
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inline void
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all_degree_centralities(const Graph& g, CentralityMap cent, Measure measure)
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{
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BOOST_CONCEPT_ASSERT(( VertexListGraphConcept<Graph> ));
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typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
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typedef typename graph_traits<Graph>::vertex_iterator VertexIterator;
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BOOST_CONCEPT_ASSERT(( WritablePropertyMapConcept<CentralityMap,Vertex> ));
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typedef typename property_traits<CentralityMap>::value_type Centrality;
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VertexIterator i, end;
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for(boost::tie(i, end) = vertices(g); i != end; ++i) {
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Centrality c = degree_centrality(g, *i, measure);
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put(cent, *i, c);
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}
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}
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template <typename Graph, typename CentralityMap>
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inline void all_degree_centralities(const Graph& g, CentralityMap cent)
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{ all_degree_centralities(g, cent, measure_influence(g)); }
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// More helper functions for computing influence and prestige.
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// I hate the names of these functions, but influence and prestige
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// don't pluralize too well.
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template <typename Graph, typename CentralityMap>
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inline void all_influence_values(const Graph& g, CentralityMap cent)
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{ all_degree_centralities(g, cent, measure_influence(g)); }
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template <typename Graph, typename CentralityMap>
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inline void all_prestige_values(const Graph& g, CentralityMap cent)
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{ all_degree_centralities(g, cent, measure_prestige(g)); }
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} /* namespace boost */
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#endif
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