Added boost header

test/external/boost/graph/floyd_warshall_shortest.hpp

@@ -0,0 +1,255 @@
+// Copyright 2002 Rensselaer Polytechnic Institute
+
+// Distributed under 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)
+
+//  Authors: Lauren Foutz
+//           Scott Hill
+
+/*
+  This file implements the functions
+
+  template <class VertexListGraph, class DistanceMatrix, 
+    class P, class T, class R>
+  bool floyd_warshall_initialized_all_pairs_shortest_paths(
+    const VertexListGraph& g, DistanceMatrix& d, 
+    const bgl_named_params<P, T, R>& params)
+
+  AND
+
+  template <class VertexAndEdgeListGraph, class DistanceMatrix, 
+    class P, class T, class R>
+  bool floyd_warshall_all_pairs_shortest_paths(
+    const VertexAndEdgeListGraph& g, DistanceMatrix& d, 
+    const bgl_named_params<P, T, R>& params)
+*/
+
+
+#ifndef BOOST_GRAPH_FLOYD_WARSHALL_HPP
+#define BOOST_GRAPH_FLOYD_WARSHALL_HPP
+
+#include <boost/property_map/property_map.hpp>
+#include <boost/graph/graph_traits.hpp>
+#include <boost/graph/named_function_params.hpp>
+#include <boost/graph/graph_concepts.hpp>
+#include <boost/graph/relax.hpp>
+
+namespace boost
+{
+  namespace detail {
+    template<typename T, typename BinaryPredicate>
+    T min_with_compare(const T& x, const T& y, const BinaryPredicate& compare)
+    {
+      if (compare(x, y)) return x; 
+      else return y;
+    }
+
+    template<typename VertexListGraph, typename DistanceMatrix, 
+      typename BinaryPredicate, typename BinaryFunction,
+      typename Infinity, typename Zero>
+    bool floyd_warshall_dispatch(const VertexListGraph& g, 
+      DistanceMatrix& d, const BinaryPredicate &compare, 
+      const BinaryFunction &combine, const Infinity& inf, 
+      const Zero& zero)
+    {
+      typename graph_traits<VertexListGraph>::vertex_iterator 
+        i, lasti, j, lastj, k, lastk;
+    
+      
+      for (boost::tie(k, lastk) = vertices(g); k != lastk; k++)
+        for (boost::tie(i, lasti) = vertices(g); i != lasti; i++)
+          if(d[*i][*k] != inf)
+            for (boost::tie(j, lastj) = vertices(g); j != lastj; j++)
+              if(d[*k][*j] != inf)
+                d[*i][*j] = 
+                  detail::min_with_compare(d[*i][*j], 
+                                           combine(d[*i][*k], d[*k][*j]),
+                                           compare);
+      
+      
+      for (boost::tie(i, lasti) = vertices(g); i != lasti; i++)
+        if (compare(d[*i][*i], zero))
+          return false;
+      return true;
+    }
+  }
+
+  template <typename VertexListGraph, typename DistanceMatrix, 
+    typename BinaryPredicate, typename BinaryFunction,
+    typename Infinity, typename Zero>
+  bool floyd_warshall_initialized_all_pairs_shortest_paths(
+    const VertexListGraph& g, DistanceMatrix& d, 
+    const BinaryPredicate& compare, 
+    const BinaryFunction& combine, const Infinity& inf, 
+    const Zero& zero)
+  {
+    function_requires<VertexListGraphConcept<VertexListGraph> >();
+  
+    return detail::floyd_warshall_dispatch(g, d, compare, combine, 
+    inf, zero);
+  }
+  
+
+  
+  template <typename VertexAndEdgeListGraph, typename DistanceMatrix, 
+    typename WeightMap, typename BinaryPredicate, 
+    typename BinaryFunction, typename Infinity, typename Zero>
+  bool floyd_warshall_all_pairs_shortest_paths(
+    const VertexAndEdgeListGraph& g, 
+    DistanceMatrix& d, const WeightMap& w, 
+    const BinaryPredicate& compare, const BinaryFunction& combine, 
+    const Infinity& inf, const Zero& zero)
+  {
+    function_requires<VertexListGraphConcept<VertexAndEdgeListGraph> >();
+    function_requires<EdgeListGraphConcept<VertexAndEdgeListGraph> >();
+    function_requires<IncidenceGraphConcept<VertexAndEdgeListGraph> >();
+  
+    typename graph_traits<VertexAndEdgeListGraph>::vertex_iterator 
+      firstv, lastv, firstv2, lastv2;
+    typename graph_traits<VertexAndEdgeListGraph>::edge_iterator first, last;
+  
+    
+    for(boost::tie(firstv, lastv) = vertices(g); firstv != lastv; firstv++)
+      for(boost::tie(firstv2, lastv2) = vertices(g); firstv2 != lastv2; firstv2++)
+        d[*firstv][*firstv2] = inf;
+    
+    
+    for(boost::tie(firstv, lastv) = vertices(g); firstv != lastv; firstv++)
+      d[*firstv][*firstv] = zero;
+    
+    
+    for(boost::tie(first, last) = edges(g); first != last; first++)
+    {
+      if (d[source(*first, g)][target(*first, g)] != inf) {
+        d[source(*first, g)][target(*first, g)] = 
+          detail::min_with_compare(
+            get(w, *first), 
+            d[source(*first, g)][target(*first, g)],
+            compare);
+      } else 
+        d[source(*first, g)][target(*first, g)] = get(w, *first);
+    }
+    
+    bool is_undirected = is_same<typename 
+      graph_traits<VertexAndEdgeListGraph>::directed_category, 
+      undirected_tag>::value;
+    if (is_undirected)
+    {
+      for(boost::tie(first, last) = edges(g); first != last; first++)
+      {
+        if (d[target(*first, g)][source(*first, g)] != inf)
+          d[target(*first, g)][source(*first, g)] = 
+            detail::min_with_compare(
+              get(w, *first), 
+              d[target(*first, g)][source(*first, g)],
+              compare);
+        else 
+          d[target(*first, g)][source(*first, g)] = get(w, *first);
+      }
+    }
+    
+  
+    return detail::floyd_warshall_dispatch(g, d, compare, combine, 
+      inf, zero);
+  }
+  
+
+  namespace detail {        
+    template <class VertexListGraph, class DistanceMatrix, 
+      class WeightMap, class P, class T, class R>
+    bool floyd_warshall_init_dispatch(const VertexListGraph& g, 
+      DistanceMatrix& d, WeightMap /*w*/, 
+      const bgl_named_params<P, T, R>& params)
+    {
+      typedef typename property_traits<WeightMap>::value_type WM;
+      WM inf =
+        choose_param(get_param(params, distance_inf_t()), 
+          std::numeric_limits<WM>::max BOOST_PREVENT_MACRO_SUBSTITUTION());
+    
+      return floyd_warshall_initialized_all_pairs_shortest_paths(g, d,
+        choose_param(get_param(params, distance_compare_t()), 
+          std::less<WM>()),
+        choose_param(get_param(params, distance_combine_t()), 
+          closed_plus<WM>(inf)),
+        inf,
+        choose_param(get_param(params, distance_zero_t()), 
+          WM()));
+    }
+    
+
+    
+    template <class VertexAndEdgeListGraph, class DistanceMatrix, 
+      class WeightMap, class P, class T, class R>
+    bool floyd_warshall_noninit_dispatch(const VertexAndEdgeListGraph& g, 
+      DistanceMatrix& d, WeightMap w, 
+      const bgl_named_params<P, T, R>& params)
+    {
+      typedef typename property_traits<WeightMap>::value_type WM;
+    
+      WM inf =
+        choose_param(get_param(params, distance_inf_t()), 
+          std::numeric_limits<WM>::max BOOST_PREVENT_MACRO_SUBSTITUTION());
+      return floyd_warshall_all_pairs_shortest_paths(g, d, w,
+        choose_param(get_param(params, distance_compare_t()), 
+          std::less<WM>()),
+        choose_param(get_param(params, distance_combine_t()), 
+          closed_plus<WM>(inf)),
+        inf,
+        choose_param(get_param(params, distance_zero_t()), 
+          WM()));
+    }
+    
+
+  }   // namespace detail
+
+  
+  
+  template <class VertexListGraph, class DistanceMatrix, class P, 
+    class T, class R>
+  bool floyd_warshall_initialized_all_pairs_shortest_paths(
+    const VertexListGraph& g, DistanceMatrix& d, 
+    const bgl_named_params<P, T, R>& params)
+  {
+    return detail::floyd_warshall_init_dispatch(g, d, 
+      choose_const_pmap(get_param(params, edge_weight), g, edge_weight), 
+      params);
+  }
+  
+  template <class VertexListGraph, class DistanceMatrix>
+  bool floyd_warshall_initialized_all_pairs_shortest_paths(
+    const VertexListGraph& g, DistanceMatrix& d)
+  {
+    bgl_named_params<int,int> params(0);
+    return detail::floyd_warshall_init_dispatch(g, d,
+      get(edge_weight, g), params);
+  }
+  
+
+  
+  
+  template <class VertexAndEdgeListGraph, class DistanceMatrix, 
+    class P, class T, class R>
+  bool floyd_warshall_all_pairs_shortest_paths(
+    const VertexAndEdgeListGraph& g, DistanceMatrix& d, 
+    const bgl_named_params<P, T, R>& params)
+  {
+    return detail::floyd_warshall_noninit_dispatch(g, d, 
+      choose_const_pmap(get_param(params, edge_weight), g, edge_weight), 
+      params);
+  }
+  
+  template <class VertexAndEdgeListGraph, class DistanceMatrix>
+  bool floyd_warshall_all_pairs_shortest_paths(
+    const VertexAndEdgeListGraph& g, DistanceMatrix& d)
+  {
+    bgl_named_params<int,int> params(0);
+    return detail::floyd_warshall_noninit_dispatch(g, d,
+      get(edge_weight, g), params);
+  }
+  
+
+} // namespace boost
+
+#endif
+