diff DEPENDENCIES/generic/include/boost/graph/howard_cycle_ratio.hpp @ 16:2665513ce2d3

Add boost headers

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DEPENDENCIES/generic/include/boost/graph/howard_cycle_ratio.hpp	Tue Aug 05 11:11:38 2014 +0100
@@ -0,0 +1,635 @@
+// Copyright (C) 2006-2009 Dmitry Bufistov and Andrey Parfenov
+
+// Use, modification and distribution is subject to the Boost Software
+// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GRAPH_CYCLE_RATIO_HOWARD_HPP
+#define BOOST_GRAPH_CYCLE_RATIO_HOWARD_HPP
+
+#include <vector>
+#include <list>
+#include <algorithm>
+#include <limits>
+
+#include <boost/bind.hpp>
+#include <boost/type_traits/is_same.hpp>
+#include <boost/type_traits/remove_const.hpp>
+#include <boost/concept_check.hpp>
+#include <boost/pending/queue.hpp>
+#include <boost/property_map/property_map.hpp>
+#include <boost/graph/graph_traits.hpp>
+#include <boost/graph/graph_concepts.hpp>
+#include <boost/concept/assert.hpp>
+
+/** @file howard_cycle_ratio.hpp
+ * @brief The implementation of the maximum/minimum cycle ratio/mean algorithm.
+ * @author Dmitry Bufistov
+ * @author Andrey Parfenov
+ */
+
+namespace boost {
+
+  /**
+   * The mcr_float is like numeric_limits, but only for floating point types
+   * and only defines infinity() and epsilon(). This class is primarily used
+   * to encapsulate a less-precise epsilon than natively supported by the
+   * floating point type.
+   */
+  template <typename Float = double> struct mcr_float {
+    typedef Float value_type;
+
+    static Float infinity()
+    { return std::numeric_limits<value_type>::infinity(); }
+
+    static Float epsilon()
+    { return Float(-0.005); }
+  };
+
+  namespace detail {
+
+    template <typename FloatTraits> struct
+    min_comparator_props {
+      typedef std::greater<typename FloatTraits::value_type> comparator;
+      static const int multiplier = 1;
+    };
+
+    template <typename FloatTraits> struct
+    max_comparator_props {
+      typedef std::less<typename FloatTraits::value_type> comparator;
+      static const int multiplier = -1;
+    };
+
+    template <typename FloatTraits, typename ComparatorProps>
+    struct float_wrapper {
+      typedef typename FloatTraits::value_type value_type;
+      typedef ComparatorProps comparator_props_t;
+      typedef typename ComparatorProps::comparator comparator;
+
+      static value_type infinity()
+      { return FloatTraits::infinity() * ComparatorProps::multiplier; }
+
+      static value_type epsilon()
+      { return FloatTraits::epsilon() * ComparatorProps::multiplier; }
+
+    };
+
+    /*! @class mcr_howard
+     * @brief Calculates optimum (maximum/minimum) cycle ratio of a directed graph.
+     * Uses  Howard's iteration policy algorithm. </br>(It is described in the paper
+     * "Experimental Analysis of the Fastest Optimum Cycle Ratio and Mean Algorithm"
+     * by Ali Dasdan).
+     */
+    template <typename FloatTraits,
+              typename Graph, typename VertexIndexMap,
+              typename EdgeWeight1, typename EdgeWeight2>
+    class mcr_howard
+    {
+    public:
+      typedef typename FloatTraits::value_type float_t;
+      typedef typename FloatTraits::comparator_props_t cmp_props_t;
+      typedef typename FloatTraits::comparator comparator_t;
+      typedef enum{ my_white = 0, my_black } my_color_type;
+      typedef typename graph_traits<Graph>::vertex_descriptor vertex_t;
+      typedef typename graph_traits<Graph>::edge_descriptor edge_t;
+      typedef typename graph_traits<Graph>::vertices_size_type vn_t;
+      typedef std::vector<float_t> vp_t;
+      typedef typename boost::iterator_property_map<
+        typename vp_t::iterator, VertexIndexMap
+      > distance_map_t; //V -> float_t
+
+      typedef typename std::vector<edge_t> ve_t;
+      typedef std::vector<my_color_type> vcol_t;
+      typedef typename ::boost::iterator_property_map<
+        typename ve_t::iterator, VertexIndexMap
+      > policy_t; //Vertex -> Edge
+      typedef typename ::boost::iterator_property_map<
+        typename vcol_t::iterator, VertexIndexMap
+      > color_map_t;
+
+      typedef typename std::list<vertex_t> pinel_t;// The in_edges list of the policy graph
+      typedef typename std::vector<pinel_t> inedges1_t;
+      typedef typename ::boost::iterator_property_map<
+        typename inedges1_t::iterator, VertexIndexMap
+      > inedges_t;
+      typedef typename std::vector<edge_t> critical_cycle_t;
+
+      //Bad  vertex flag. If true, then the vertex is "bad".
+      // Vertex is "bad" if its out_degree is equal to zero.
+      typedef typename boost::iterator_property_map<
+        std::vector<int>::iterator, VertexIndexMap
+      > badv_t;
+
+      /*!
+       * Constructor
+       * \param g = (V, E) - a directed multigraph.
+       * \param vim  Vertex Index Map. Read property Map: V -> [0, num_vertices(g)).
+       * \param ewm  edge weight map. Read property map: E -> R
+       * \param ew2m  edge weight map. Read property map: E -> R+
+       * \param infty A big enough value to guaranty that there exist a cycle with
+       *  better ratio.
+       * \param cmp The compare operator for float_ts.
+       */
+      mcr_howard(const Graph &g, VertexIndexMap vim,
+                  EdgeWeight1 ewm, EdgeWeight2 ew2m) :
+        m_g(g), m_vim(vim), m_ew1m(ewm), m_ew2m(ew2m),
+        m_bound(mcr_bound()),
+        m_cr(m_bound),
+        m_V(num_vertices(m_g)),
+        m_dis(m_V, 0), m_dm(m_dis.begin(), m_vim),
+        m_policyc(m_V), m_policy(m_policyc.begin(), m_vim),
+        m_inelc(m_V), m_inel(m_inelc.begin(), m_vim),
+        m_badvc(m_V, false), m_badv(m_badvc.begin(), m_vim),
+        m_colcv(m_V),
+        m_col_bfs(m_V)
+      { }
+
+      /*!
+       * \return maximum/minimum_{for all cycles C}
+       *         [sum_{e in C} w1(e)] / [sum_{e in C} w2(e)],
+       * or FloatTraits::infinity() if graph has no cycles.
+       */
+      float_t ocr_howard()
+      {
+        construct_policy_graph();
+        int k = 0;
+        float_t mcr = 0;
+        do
+          {
+            mcr = policy_mcr();
+            ++k;
+          }
+        while (try_improve_policy(mcr) && k < 100); //To avoid infinite loop
+
+        const float_t eps_ =  -0.00000001 * cmp_props_t::multiplier;
+        if (m_cmp(mcr, m_bound + eps_))
+          {
+            return FloatTraits::infinity();
+          }
+        else
+          {
+            return  mcr;
+          }
+      }
+      virtual ~mcr_howard() {}
+
+    protected:
+      virtual void store_critical_edge(edge_t, critical_cycle_t &) {}
+      virtual void store_critical_cycle(critical_cycle_t &) {}
+
+    private:
+      /*!
+       * \return lower/upper bound for the maximal/minimal cycle ratio
+       */
+      float_t mcr_bound()
+      {
+        typename  graph_traits<Graph>::vertex_iterator  vi, vie;
+        typename  graph_traits<Graph>::out_edge_iterator  oei, oeie;
+        float_t cz = (std::numeric_limits<float_t>::max)(); //Closest to zero value
+        float_t s = 0;
+        const float_t eps_ = std::numeric_limits<float_t>::epsilon();
+        for (boost::tie(vi, vie) = vertices(m_g); vi != vie; ++vi)
+          {
+            for (boost::tie(oei, oeie) = out_edges(*vi, m_g); oei != oeie; ++oei)
+              {
+                s += std::abs(m_ew1m[*oei]);
+                float_t a = std::abs(m_ew2m[*oei]);
+                if ( a > eps_ && a < cz)
+                {
+                  cz = a;
+                }
+              }
+          }
+        return  cmp_props_t::multiplier * (s / cz);
+      }
+
+
+      /*!
+       *  Constructs an arbitrary policy graph.
+       */
+      void construct_policy_graph()
+      {
+        m_sink = graph_traits<Graph>().null_vertex();
+        typename  graph_traits<Graph>::vertex_iterator  vi, vie;
+        typename  graph_traits<Graph>::out_edge_iterator  oei, oeie;
+        for ( boost::tie(vi, vie) = vertices(m_g); vi != vie; ++vi )
+          {
+            boost::tie(oei, oeie) = out_edges(*vi, m_g);
+            typename graph_traits<Graph>::out_edge_iterator mei =
+              std::max_element(oei, oeie,
+                               boost::bind(m_cmp,
+                                           boost::bind(&EdgeWeight1::operator[], m_ew1m, _1),
+                                           boost::bind(&EdgeWeight1::operator[], m_ew1m, _2)
+                                          )
+                               );
+            if (mei == oeie)
+              {
+                if (m_sink == graph_traits<Graph>().null_vertex())
+                  {
+                    m_sink = *vi;
+                  }
+                m_badv[*vi] = true;
+                m_inel[m_sink].push_back(*vi);
+              }
+            else
+              {
+                m_inel[target(*mei, m_g)].push_back(*vi);
+                m_policy[*vi] = *mei;
+              }
+          }
+      }
+      /*! Sets the distance value for all vertices "v" such that there is
+       * a path from "v" to "sv". It does "inverse" breadth first visit of the policy
+       * graph, starting from the vertex "sv".
+       */
+      void mcr_bfv(vertex_t sv, float_t cr, color_map_t c)
+      {
+        boost::queue<vertex_t> Q;
+        c[sv] = my_black;
+        Q.push(sv);
+        while (!Q.empty())
+          {
+            vertex_t v = Q.top(); Q.pop();
+            for (typename pinel_t::const_iterator itr = m_inel[v].begin();
+                 itr != m_inel[v].end(); ++itr)
+              //For all in_edges of the policy graph
+              {
+                if (*itr != sv)
+                  {
+                    if (m_badv[*itr])
+                      {
+                        m_dm[*itr] = m_dm[v] + m_bound - cr;
+                      }
+                    else
+                      {
+                        m_dm[*itr] = m_dm[v] + m_ew1m[m_policy[*itr]] -
+                          m_ew2m[m_policy[*itr]] * cr;
+                      }
+                    c[*itr] = my_black;
+                    Q.push(*itr);
+                  }
+              }
+          }
+      }
+
+      /*!
+       * \param sv an arbitrary (undiscovered) vertex of the policy graph.
+       * \return a vertex in the policy graph that belongs to a cycle.
+       * Performs a depth first visit until a cycle edge is found.
+       */
+      vertex_t find_cycle_vertex(vertex_t sv)
+      {
+        vertex_t gv = sv;
+        std::fill(m_colcv.begin(), m_colcv.end(), my_white);
+        color_map_t cm(m_colcv.begin(), m_vim);
+        do
+          {
+            cm[gv] = my_black;
+            if (! m_badv[gv])
+              {
+                gv = target(m_policy[gv], m_g);
+              }
+            else
+              {
+                gv = m_sink;
+              }
+          }
+        while (cm[gv] != my_black);
+        return gv;
+      }
+
+      /*!
+       * \param sv - vertex that belongs to a cycle in the policy graph.
+       */
+      float_t cycle_ratio(vertex_t sv)
+      {
+        if (sv == m_sink) return m_bound;
+        std::pair<float_t, float_t> sums_(float_t(0), float_t(0));
+        vertex_t v = sv;
+        critical_cycle_t cc;
+        do
+          {
+            store_critical_edge(m_policy[v], cc);
+            sums_.first += m_ew1m[m_policy[v]];
+            sums_.second += m_ew2m[m_policy[v]];
+            v = target(m_policy[v], m_g);
+          }
+        while (v != sv);
+        float_t cr = sums_.first / sums_.second;
+        if ( m_cmp(m_cr, cr) )
+          {
+            m_cr = cr;
+            store_critical_cycle(cc);
+          }
+        return cr;
+      }
+
+      /*!
+       *  Finds the optimal cycle ratio of the policy graph
+       */
+      float_t policy_mcr()
+      {
+        std::fill(m_col_bfs.begin(), m_col_bfs.end(), my_white);
+        color_map_t vcm_ = color_map_t(m_col_bfs.begin(), m_vim);
+        typename graph_traits<Graph>::vertex_iterator uv_itr, vie;
+        boost::tie(uv_itr, vie) = vertices(m_g);
+        float_t mcr = m_bound;
+        while ( (uv_itr = std::find_if(uv_itr, vie,
+                                       boost::bind(std::equal_to<my_color_type>(),
+                                                   my_white,
+                                                   boost::bind(&color_map_t::operator[], vcm_, _1)
+                                                   )
+                                       )
+                 ) != vie )
+          ///While there are undiscovered vertices
+          {
+            vertex_t gv = find_cycle_vertex(*uv_itr);
+            float_t cr = cycle_ratio(gv) ;
+            mcr_bfv(gv, cr, vcm_);
+            if ( m_cmp(mcr, cr) )  mcr = cr;
+            ++uv_itr;
+          }
+        return mcr;
+      }
+
+      /*!
+       * Changes the edge m_policy[s] to the new_edge.
+       */
+      void improve_policy(vertex_t s, edge_t new_edge)
+      {
+        vertex_t t = target(m_policy[s], m_g);
+        typename property_traits<VertexIndexMap>::value_type ti = m_vim[t];
+        m_inelc[ti].erase( std::find(m_inelc[ti].begin(), m_inelc[ti].end(), s));
+        m_policy[s] = new_edge;
+        t = target(new_edge, m_g);
+        m_inel[t].push_back(s); ///Maintain in_edge list
+      }
+
+      /*!
+       * A negative cycle detector.
+       */
+      bool try_improve_policy(float_t cr)
+      {
+        bool improved = false;
+        typename  graph_traits<Graph>::vertex_iterator  vi, vie;
+        typename  graph_traits<Graph>::out_edge_iterator  oei, oeie;
+        const float_t eps_ =  FloatTraits::epsilon();
+        for (boost::tie(vi, vie) = vertices(m_g); vi != vie; ++vi)
+          {
+            if (!m_badv[*vi])
+              {
+                for (boost::tie(oei, oeie) = out_edges(*vi, m_g); oei != oeie; ++oei)
+                  {
+                    vertex_t t = target(*oei, m_g);
+                    //Current distance from *vi to some vertex
+                    float_t dis_ = m_ew1m[*oei] - m_ew2m[*oei] * cr + m_dm[t];
+                    if ( m_cmp(m_dm[*vi] + eps_, dis_) )
+                      {
+                        improve_policy(*vi, *oei);
+                        m_dm[*vi] = dis_;
+                        improved = true;
+                      }
+                  }
+              }
+            else
+              {
+                float_t dis_ = m_bound - cr + m_dm[m_sink];
+                if ( m_cmp(m_dm[*vi] + eps_, dis_) )
+                  {
+                    m_dm[*vi] = dis_;
+                  }
+              }
+          }
+        return improved;
+      }
+    private:
+      const Graph &m_g;
+      VertexIndexMap m_vim;
+      EdgeWeight1 m_ew1m;
+      EdgeWeight2 m_ew2m;
+      comparator_t m_cmp;
+      float_t m_bound; //> The lower/upper bound to the maximal/minimal cycle ratio
+      float_t m_cr; //>The best cycle ratio that has been found so far
+
+      vn_t m_V; //>The number of the vertices in the graph
+      vp_t m_dis; //>Container for the distance map
+      distance_map_t m_dm; //>Distance map
+
+      ve_t m_policyc; //>Container for the policy graph
+      policy_t m_policy; //>The interface for the policy graph
+
+      inedges1_t m_inelc; //>Container fot in edges list
+      inedges_t m_inel; //>Policy graph, input edges list
+
+      std::vector<int> m_badvc;
+      badv_t m_badv; //Marks "bad" vertices
+
+      vcol_t m_colcv, m_col_bfs; //Color maps
+      vertex_t m_sink; //To convert any graph to "good"
+    };
+
+    /*! \class mcr_howard1
+  * \brief Finds optimum cycle raio and a critical cycle
+     */
+    template <typename FloatTraits,
+              typename Graph, typename VertexIndexMap,
+              typename EdgeWeight1, typename EdgeWeight2>
+    class mcr_howard1  : public
+    mcr_howard<FloatTraits, Graph, VertexIndexMap,
+               EdgeWeight1, EdgeWeight2>
+    {
+    public:
+      typedef mcr_howard<FloatTraits, Graph, VertexIndexMap,
+        EdgeWeight1, EdgeWeight2> inhr_t;
+      mcr_howard1(const Graph &g, VertexIndexMap vim,
+        EdgeWeight1 ewm, EdgeWeight2 ew2m) :
+        inhr_t(g, vim, ewm, ew2m)
+      { }
+
+      void get_critical_cycle(typename inhr_t::critical_cycle_t &cc)
+      { return cc.swap(m_cc); }
+
+    protected:
+      void store_critical_edge(typename inhr_t::edge_t ed,
+        typename inhr_t::critical_cycle_t &cc)
+      { cc.push_back(ed); }
+
+      void store_critical_cycle(typename inhr_t::critical_cycle_t &cc)
+      { m_cc.swap(cc); }
+
+    private:
+      typename inhr_t::critical_cycle_t m_cc; //Critical cycle
+    };
+
+    /*!
+     * \param g a directed multigraph.
+     * \param vim Vertex Index Map. A map V->[0, num_vertices(g))
+     * \param ewm Edge weight1 map.
+     * \param ew2m Edge weight2 map.
+     * \param pcc  pointer to the critical edges list.
+     * \return Optimum cycle ratio of g or FloatTraits::infinity() if g has no cycles.
+     */
+    template <typename FT,
+              typename TG, typename TVIM,
+              typename TEW1, typename TEW2,
+              typename EV>
+    typename FT::value_type
+ optimum_cycle_ratio(const TG &g, TVIM vim, TEW1 ewm, TEW2 ew2m, EV* pcc)
+    {
+      typedef typename graph_traits<TG>::directed_category DirCat;
+      BOOST_STATIC_ASSERT((is_convertible<DirCat*, directed_tag*>::value == true));
+      BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept<TG> ));
+      BOOST_CONCEPT_ASSERT(( VertexListGraphConcept<TG> ));
+      typedef typename graph_traits<TG>::vertex_descriptor Vertex;
+      BOOST_CONCEPT_ASSERT(( ReadablePropertyMapConcept<TVIM, Vertex> ));
+      typedef typename graph_traits<TG>::edge_descriptor Edge;
+      BOOST_CONCEPT_ASSERT(( ReadablePropertyMapConcept<TEW1, Edge> ));
+      BOOST_CONCEPT_ASSERT(( ReadablePropertyMapConcept<TEW2, Edge> ));
+
+      if(pcc == 0) {
+          return detail::mcr_howard<FT,TG, TVIM, TEW1, TEW2>(
+            g, vim, ewm, ew2m
+          ).ocr_howard();
+      }
+
+      detail::mcr_howard1<FT, TG, TVIM, TEW1, TEW2> obj(g, vim, ewm, ew2m);
+      double ocr = obj.ocr_howard();
+      obj.get_critical_cycle(*pcc);
+      return ocr;
+    }
+  } // namespace detail
+
+// Algorithms
+// Maximum Cycle Ratio
+
+template <
+    typename FloatTraits,
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeight1Map,
+    typename EdgeWeight2Map>
+inline typename FloatTraits::value_type
+maximum_cycle_ratio(const Graph &g, VertexIndexMap vim, EdgeWeight1Map ew1m,
+                    EdgeWeight2Map ew2m,
+                    std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0,
+                    FloatTraits = FloatTraits())
+{
+    typedef detail::float_wrapper<
+        FloatTraits, detail::max_comparator_props<FloatTraits>
+    > Traits;
+    return detail::optimum_cycle_ratio<Traits>(g, vim, ew1m, ew2m, pcc);
+}
+
+template <
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeight1Map,
+    typename EdgeWeight2Map>
+inline double
+maximum_cycle_ratio(const Graph &g, VertexIndexMap vim,
+                    EdgeWeight1Map ew1m, EdgeWeight2Map ew2m,
+                    std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0)
+{ return maximum_cycle_ratio(g, vim, ew1m, ew2m, pcc, mcr_float<>()); }
+
+// Minimum Cycle Ratio
+
+template <
+    typename FloatTraits,
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeight1Map,
+    typename EdgeWeight2Map>
+typename FloatTraits::value_type
+minimum_cycle_ratio(const Graph &g, VertexIndexMap vim,
+                    EdgeWeight1Map ew1m, EdgeWeight2Map ew2m,
+                    std::vector<typename graph_traits<Graph>::edge_descriptor> *pcc = 0,
+                    FloatTraits = FloatTraits())
+{
+    typedef detail::float_wrapper<
+        FloatTraits, detail::min_comparator_props<FloatTraits>
+    > Traits;
+    return detail::optimum_cycle_ratio<Traits>(g, vim, ew1m, ew2m, pcc);
+}
+
+template <
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeight1Map,
+    typename EdgeWeight2Map>
+inline double
+minimum_cycle_ratio(const Graph &g, VertexIndexMap vim,
+                    EdgeWeight1Map ew1m, EdgeWeight2Map ew2m,
+                    std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0)
+{ return minimum_cycle_ratio(g, vim, ew1m, ew2m, pcc, mcr_float<>()); }
+
+// Maximum Cycle Mean
+
+template <
+    typename FloatTraits,
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeightMap,
+    typename EdgeIndexMap>
+inline typename FloatTraits::value_type
+maximum_cycle_mean(const Graph &g, VertexIndexMap vim,
+                   EdgeWeightMap ewm, EdgeIndexMap eim,
+                   std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0,
+                   FloatTraits ft = FloatTraits())
+{
+    typedef typename remove_const<
+        typename property_traits<EdgeWeightMap>::value_type
+    >::type Weight;
+    typename std::vector<Weight> ed_w2(boost::num_edges(g), 1);
+    return maximum_cycle_ratio(g, vim, ewm,
+                               make_iterator_property_map(ed_w2.begin(), eim),
+                               pcc, ft);
+}
+
+template <
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeightMap,
+    typename EdgeIndexMap>
+inline double
+maximum_cycle_mean(const Graph& g, VertexIndexMap vim,
+                   EdgeWeightMap ewm, EdgeIndexMap eim,
+                   std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0)
+{ return maximum_cycle_mean(g, vim, ewm, eim, pcc, mcr_float<>()); }
+
+// Minimum Cycle Mean
+
+template <
+    typename FloatTraits,
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeightMap,
+    typename EdgeIndexMap>
+inline typename FloatTraits::value_type
+minimum_cycle_mean(const Graph &g, VertexIndexMap vim,
+                   EdgeWeightMap ewm, EdgeIndexMap eim,
+                   std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0,
+                   FloatTraits ft = FloatTraits())
+{
+    typedef typename remove_const<
+        typename property_traits<EdgeWeightMap>::value_type
+    >::type Weight;
+    typename std::vector<Weight> ed_w2(boost::num_edges(g), 1);
+    return minimum_cycle_ratio(g, vim, ewm,
+                               make_iterator_property_map(ed_w2.begin(), eim),
+                               pcc, ft);
+}
+
+template <
+    typename Graph,
+    typename VertexIndexMap,
+    typename EdgeWeightMap,
+    typename EdgeIndexMap>
+inline double
+minimum_cycle_mean(const Graph &g, VertexIndexMap vim,
+                   EdgeWeightMap ewm, EdgeIndexMap eim,
+                   std::vector<typename graph_traits<Graph>::edge_descriptor>* pcc = 0)
+{ return minimum_cycle_mean(g, vim, ewm, eim, pcc, mcr_float<>()); }
+
+} //namespace boost
+
+#endif