115 lines
4.5 KiB
C++
115 lines
4.5 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_ECCENTRICITY_HPP
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#define BOOST_GRAPH_ECCENTRICITY_HPP
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#include <boost/next_prior.hpp>
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#include <boost/config.hpp>
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#include <boost/graph/detail/geodesic.hpp>
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#include <boost/concept/assert.hpp>
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namespace boost
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{
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template <typename Graph,
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typename DistanceMap,
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typename Combinator>
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inline typename property_traits<DistanceMap>::value_type
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eccentricity(const Graph& g, DistanceMap dist, Combinator combine)
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{
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BOOST_CONCEPT_ASSERT(( GraphConcept<Graph> ));
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typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
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BOOST_CONCEPT_ASSERT(( ReadablePropertyMapConcept<DistanceMap,Vertex> ));
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typedef typename property_traits<DistanceMap>::value_type Distance;
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return detail::combine_distances(g, dist, combine, Distance(0));
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}
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template <typename Graph, typename DistanceMap>
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inline typename property_traits<DistanceMap>::value_type
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eccentricity(const Graph& g, DistanceMap dist)
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{
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BOOST_CONCEPT_ASSERT(( GraphConcept<Graph> ));
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typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
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BOOST_CONCEPT_ASSERT(( ReadablePropertyMapConcept<DistanceMap,Vertex> ));
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typedef typename property_traits<DistanceMap>::value_type Distance;
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return eccentricity(g, dist, detail::maximize<Distance>());
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}
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template <typename Graph, typename DistanceMatrix, typename EccentricityMap>
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inline std::pair<typename property_traits<EccentricityMap>::value_type,
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typename property_traits<EccentricityMap>::value_type>
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all_eccentricities(const Graph& g, const DistanceMatrix& dist, EccentricityMap ecc)
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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(( ReadablePropertyMapConcept<DistanceMatrix,Vertex> ));
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typedef typename property_traits<DistanceMatrix>::value_type DistanceMap;
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BOOST_CONCEPT_ASSERT(( WritablePropertyMapConcept<EccentricityMap,Vertex> ));
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typedef typename property_traits<EccentricityMap>::value_type Eccentricity;
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BOOST_USING_STD_MIN();
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BOOST_USING_STD_MAX();
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Eccentricity
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r = numeric_values<Eccentricity>::infinity(),
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d = numeric_values<Eccentricity>::zero();
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VertexIterator i, end;
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boost::tie(i, end) = vertices(g);
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for(boost::tie(i, end) = vertices(g); i != end; ++i) {
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DistanceMap dm = get(dist, *i);
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Eccentricity e = eccentricity(g, dm);
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put(ecc, *i, e);
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// track the radius and diameter at the same time
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r = min BOOST_PREVENT_MACRO_SUBSTITUTION (r, e);
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d = max BOOST_PREVENT_MACRO_SUBSTITUTION (d, e);
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}
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return std::make_pair(r, d);
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}
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template <typename Graph, typename EccentricityMap>
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inline std::pair<typename property_traits<EccentricityMap>::value_type,
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typename property_traits<EccentricityMap>::value_type>
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radius_and_diameter(const Graph& g, EccentricityMap ecc)
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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(( ReadablePropertyMapConcept<EccentricityMap, Vertex> ));
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typedef typename property_traits<EccentricityMap>::value_type Eccentricity;
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BOOST_USING_STD_MIN();
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BOOST_USING_STD_MAX();
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VertexIterator i, end;
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boost::tie(i, end) = vertices(g);
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Eccentricity radius = get(ecc, *i);
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Eccentricity diameter = get(ecc, *i);
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for(i = boost::next(i); i != end; ++i) {
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Eccentricity cur = get(ecc, *i);
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radius = min BOOST_PREVENT_MACRO_SUBSTITUTION (radius, cur);
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diameter = max BOOST_PREVENT_MACRO_SUBSTITUTION (diameter, cur);
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}
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return std::make_pair(radius, diameter);
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}
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template <typename Graph, typename EccentricityMap>
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inline typename property_traits<EccentricityMap>::value_type
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radius(const Graph& g, EccentricityMap ecc)
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{ return radius_and_diameter(g, ecc).first; }
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template <typename Graph, typename EccentricityMap>
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inline typename property_traits<EccentricityMap>::value_type
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diameter(const Graph& g, EccentricityMap ecc)
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{ return radius_and_diameter(g, ecc).second; }
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} /* namespace boost */
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#endif
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