| // (C) Copyright 2007-2009 Andrew Sutton |
| // |
| // Use, modification and distribution are subject to the |
| // Boost Software License, Version 1.0 (See accompanying file |
| // LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_GRAPH_ECCENTRICITY_HPP |
| #define BOOST_GRAPH_ECCENTRICITY_HPP |
| |
| #include <boost/utility.hpp> |
| #include <boost/config.hpp> |
| #include <boost/graph/detail/geodesic.hpp> |
| |
| namespace boost |
| { |
| template <typename Graph, |
| typename DistanceMap, |
| typename Combinator> |
| inline typename property_traits<DistanceMap>::value_type |
| eccentricity(const Graph& g, DistanceMap dist, Combinator combine) |
| { |
| function_requires< GraphConcept<Graph> >(); |
| typedef typename graph_traits<Graph>::vertex_descriptor Vertex; |
| function_requires< ReadablePropertyMapConcept<DistanceMap,Vertex> >(); |
| typedef typename property_traits<DistanceMap>::value_type Distance; |
| |
| return detail::combine_distances(g, dist, combine, Distance(0)); |
| } |
| |
| template <typename Graph, typename DistanceMap> |
| inline typename property_traits<DistanceMap>::value_type |
| eccentricity(const Graph& g, DistanceMap dist) |
| { |
| function_requires< GraphConcept<Graph> >(); |
| typedef typename graph_traits<Graph>::vertex_descriptor Vertex; |
| function_requires< ReadablePropertyMapConcept<DistanceMap,Vertex> >(); |
| typedef typename property_traits<DistanceMap>::value_type Distance; |
| |
| return eccentricity(g, dist, detail::maximize<Distance>()); |
| } |
| |
| template <typename Graph, typename DistanceMatrix, typename EccentricityMap> |
| inline std::pair<typename property_traits<EccentricityMap>::value_type, |
| typename property_traits<EccentricityMap>::value_type> |
| all_eccentricities(const Graph& g, const DistanceMatrix& dist, EccentricityMap ecc) |
| { |
| function_requires< VertexListGraphConcept<Graph> >(); |
| typedef typename graph_traits<Graph>::vertex_descriptor Vertex; |
| typedef typename graph_traits<Graph>::vertex_iterator VertexIterator; |
| function_requires< ReadablePropertyMapConcept<DistanceMatrix,Vertex> >(); |
| typedef typename property_traits<DistanceMatrix>::value_type DistanceMap; |
| function_requires< WritablePropertyMapConcept<EccentricityMap,Vertex> >(); |
| typedef typename property_traits<EccentricityMap>::value_type Eccentricity; |
| BOOST_USING_STD_MIN(); |
| BOOST_USING_STD_MAX(); |
| |
| Eccentricity |
| r = numeric_values<Eccentricity>::infinity(), |
| d = numeric_values<Eccentricity>::zero(); |
| VertexIterator i, end; |
| boost::tie(i, end) = vertices(g); |
| for(boost::tie(i, end) = vertices(g); i != end; ++i) { |
| DistanceMap dm = get(dist, *i); |
| Eccentricity e = eccentricity(g, dm); |
| put(ecc, *i, e); |
| |
| // track the radius and diameter at the same time |
| r = min BOOST_PREVENT_MACRO_SUBSTITUTION (r, e); |
| d = max BOOST_PREVENT_MACRO_SUBSTITUTION (d, e); |
| } |
| return std::make_pair(r, d); |
| } |
| |
| template <typename Graph, typename EccentricityMap> |
| inline std::pair<typename property_traits<EccentricityMap>::value_type, |
| typename property_traits<EccentricityMap>::value_type> |
| radius_and_diameter(const Graph& g, EccentricityMap ecc) |
| { |
| function_requires< VertexListGraphConcept<Graph> >(); |
| typedef typename graph_traits<Graph>::vertex_descriptor Vertex; |
| typedef typename graph_traits<Graph>::vertex_iterator VertexIterator; |
| function_requires< ReadablePropertyMapConcept<EccentricityMap, Vertex> >(); |
| typedef typename property_traits<EccentricityMap>::value_type Eccentricity; |
| BOOST_USING_STD_MIN(); |
| BOOST_USING_STD_MAX(); |
| |
| VertexIterator i, end; |
| boost::tie(i, end) = vertices(g); |
| Eccentricity radius = get(ecc, *i); |
| Eccentricity diameter = get(ecc, *i); |
| for(i = boost::next(i); i != end; ++i) { |
| Eccentricity cur = get(ecc, *i); |
| radius = min BOOST_PREVENT_MACRO_SUBSTITUTION (radius, cur); |
| diameter = max BOOST_PREVENT_MACRO_SUBSTITUTION (diameter, cur); |
| } |
| return std::make_pair(radius, diameter); |
| } |
| |
| |
| template <typename Graph, typename EccentricityMap> |
| inline typename property_traits<EccentricityMap>::value_type |
| radius(const Graph& g, EccentricityMap ecc) |
| { return radius_and_diameter(g, ecc).first; } |
| |
| |
| template <typename Graph, typename EccentricityMap> |
| inline typename property_traits<EccentricityMap>::value_type |
| diameter(const Graph& g, EccentricityMap ecc) |
| { return radius_and_diameter(g, ecc).second; } |
| |
| } /* namespace boost */ |
| |
| #endif |