Added boost header

test/external/boost/graph/neighbor_bfs.hpp

@@ -0,0 +1,322 @@
+//
+//=======================================================================
+// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
+// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
+//
+// 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)
+//=======================================================================
+//
+#ifndef BOOST_GRAPH_NEIGHBOR_BREADTH_FIRST_SEARCH_HPP
+#define BOOST_GRAPH_NEIGHBOR_BREADTH_FIRST_SEARCH_HPP
+
+/*
+  Neighbor Breadth First Search
+  Like BFS, but traverses in-edges as well as out-edges.
+  (for directed graphs only. use normal BFS for undirected graphs)
+*/
+#include <boost/config.hpp>
+#include <boost/ref.hpp>
+#include <vector>
+#include <boost/pending/queue.hpp>
+#include <boost/graph/graph_traits.hpp>
+#include <boost/graph/graph_concepts.hpp>
+#include <boost/graph/visitors.hpp>
+#include <boost/graph/named_function_params.hpp>
+
+namespace boost {
+
+  template <class Visitor, class Graph>
+  struct NeighborBFSVisitorConcept {
+    void constraints() {
+      function_requires< CopyConstructibleConcept<Visitor> >();
+      vis.initialize_vertex(u, g);
+      vis.discover_vertex(u, g);
+      vis.examine_vertex(u, g);
+      vis.examine_out_edge(e, g);
+      vis.examine_in_edge(e, g);
+      vis.tree_out_edge(e, g);
+      vis.tree_in_edge(e, g);
+      vis.non_tree_out_edge(e, g);
+      vis.non_tree_in_edge(e, g);
+      vis.gray_target(e, g);
+      vis.black_target(e, g);
+      vis.gray_source(e, g);
+      vis.black_source(e, g);
+      vis.finish_vertex(u, g);
+    }
+    Visitor vis;
+    Graph g;
+    typename graph_traits<Graph>::vertex_descriptor u;
+    typename graph_traits<Graph>::edge_descriptor e;
+  };
+
+  template <class Visitors = null_visitor>
+  class neighbor_bfs_visitor {
+  public:
+    neighbor_bfs_visitor(Visitors vis = Visitors()) : m_vis(vis) { }
+
+    template <class Vertex, class Graph>
+    void initialize_vertex(Vertex u, Graph& g) {
+      invoke_visitors(m_vis, u, g, on_initialize_vertex());      
+    }
+    template <class Vertex, class Graph>
+    void discover_vertex(Vertex u, Graph& g) {
+      invoke_visitors(m_vis, u, g, on_discover_vertex());      
+    }
+    template <class Vertex, class Graph>
+    void examine_vertex(Vertex u, Graph& g) {
+      invoke_visitors(m_vis, u, g, on_examine_vertex());
+    }
+    template <class Edge, class Graph>
+    void examine_out_edge(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_examine_edge());
+    }
+    template <class Edge, class Graph>
+    void tree_out_edge(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_tree_edge());      
+    }
+    template <class Edge, class Graph>
+    void non_tree_out_edge(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_non_tree_edge());
+    }
+    template <class Edge, class Graph>
+    void gray_target(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_gray_target());
+    }
+    template <class Edge, class Graph>
+    void black_target(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_black_target());
+    }
+    template <class Edge, class Graph>
+    void examine_in_edge(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_examine_edge());
+    }
+    template <class Edge, class Graph>
+    void tree_in_edge(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_tree_edge());      
+    }
+    template <class Edge, class Graph>
+    void non_tree_in_edge(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_non_tree_edge());
+    }
+    template <class Edge, class Graph>
+    void gray_source(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_gray_target());
+    }
+    template <class Edge, class Graph>
+    void black_source(Edge e, Graph& g) {
+      invoke_visitors(m_vis, e, g, on_black_target());
+    }
+    template <class Vertex, class Graph>
+    void finish_vertex(Vertex u, Graph& g) {
+      invoke_visitors(m_vis, u, g, on_finish_vertex());      
+    }
+  protected:
+    Visitors m_vis;
+  };
+
+  template <class Visitors>
+  neighbor_bfs_visitor<Visitors>
+  make_neighbor_bfs_visitor(Visitors vis) {
+    return neighbor_bfs_visitor<Visitors>(vis);
+  }
+
+  namespace detail {
+
+    template <class BidirectionalGraph, class Buffer, class BFSVisitor, 
+              class ColorMap>
+    void neighbor_bfs_impl
+      (const BidirectionalGraph& g, 
+       typename graph_traits<BidirectionalGraph>::vertex_descriptor s, 
+       Buffer& Q, BFSVisitor vis, ColorMap color)
+
+    {
+      function_requires< BidirectionalGraphConcept<BidirectionalGraph> >();
+      typedef graph_traits<BidirectionalGraph> GTraits;
+      typedef typename GTraits::vertex_descriptor Vertex;
+      typedef typename GTraits::edge_descriptor Edge;
+      function_requires< 
+        NeighborBFSVisitorConcept<BFSVisitor, BidirectionalGraph> >();
+      function_requires< ReadWritePropertyMapConcept<ColorMap, Vertex> >();
+      typedef typename property_traits<ColorMap>::value_type ColorValue;
+      typedef color_traits<ColorValue> Color;
+      
+      put(color, s, Color::gray());
+      vis.discover_vertex(s, g);
+      Q.push(s);
+      while (! Q.empty()) {
+        Vertex u = Q.top();
+        Q.pop(); // pop before push to avoid problem if Q is priority_queue.
+        vis.examine_vertex(u, g);
+
+        typename GTraits::out_edge_iterator ei, ei_end;
+        for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) {
+          Edge e = *ei;
+          vis.examine_out_edge(e, g);
+          Vertex v = target(e, g);
+          ColorValue v_color = get(color, v);
+          if (v_color == Color::white()) {
+            vis.tree_out_edge(e, g);
+            put(color, v, Color::gray());
+            vis.discover_vertex(v, g);
+            Q.push(v);
+          } else {
+            vis.non_tree_out_edge(e, g);
+            if (v_color == Color::gray())
+              vis.gray_target(e, g);
+            else
+              vis.black_target(e, g);
+          }
+        } // for out-edges
+
+        typename GTraits::in_edge_iterator in_ei, in_ei_end;
+        for (boost::tie(in_ei, in_ei_end) = in_edges(u, g); 
+             in_ei != in_ei_end; ++in_ei) {
+          Edge e = *in_ei;
+          vis.examine_in_edge(e, g);
+          Vertex v = source(e, g);
+          ColorValue v_color = get(color, v);
+          if (v_color == Color::white()) {
+            vis.tree_in_edge(e, g);
+            put(color, v, Color::gray());
+            vis.discover_vertex(v, g);
+            Q.push(v);
+          } else {
+            vis.non_tree_in_edge(e, g);
+            if (v_color == Color::gray())
+              vis.gray_source(e, g);
+            else
+              vis.black_source(e, g);
+          }
+        } // for in-edges
+
+        put(color, u, Color::black());
+        vis.finish_vertex(u, g);
+      } // while
+    }
+
+    
+    template <class VertexListGraph, class ColorMap, class BFSVisitor,
+      class P, class T, class R>
+    void neighbor_bfs_helper
+      (VertexListGraph& g,
+       typename graph_traits<VertexListGraph>::vertex_descriptor s,
+       ColorMap color, 
+       BFSVisitor vis,
+       const bgl_named_params<P, T, R>& params)
+    {
+      typedef graph_traits<VertexListGraph> Traits;
+      // Buffer default
+      typedef typename Traits::vertex_descriptor Vertex;
+      typedef boost::queue<Vertex> queue_t;
+      queue_t Q;
+      // Initialization
+      typedef typename property_traits<ColorMap>::value_type ColorValue;
+      typedef color_traits<ColorValue> Color;
+      typename boost::graph_traits<VertexListGraph>::vertex_iterator i, i_end;
+      for (boost::tie(i, i_end) = vertices(g); i != i_end; ++i) {
+        put(color, *i, Color::white());
+        vis.initialize_vertex(*i, g);
+      }
+      neighbor_bfs_impl
+        (g, s, 
+         choose_param(get_param(params, buffer_param_t()), boost::ref(Q)).get(),
+         vis, color);
+    }
+
+    //-------------------------------------------------------------------------
+    // Choose between default color and color parameters. Using
+    // function dispatching so that we don't require vertex index if
+    // the color default is not being used.
+
+    template <class ColorMap>
+    struct neighbor_bfs_dispatch {
+      template <class VertexListGraph, class P, class T, class R>
+      static void apply
+      (VertexListGraph& g,
+       typename graph_traits<VertexListGraph>::vertex_descriptor s,
+       const bgl_named_params<P, T, R>& params,
+       ColorMap color)
+      {
+        neighbor_bfs_helper
+          (g, s, color,
+           choose_param(get_param(params, graph_visitor),
+                        make_neighbor_bfs_visitor(null_visitor())),
+           params);
+      }
+    };
+
+    template <>
+    struct neighbor_bfs_dispatch<detail::error_property_not_found> {
+      template <class VertexListGraph, class P, class T, class R>
+      static void apply
+      (VertexListGraph& g,
+       typename graph_traits<VertexListGraph>::vertex_descriptor s,
+       const bgl_named_params<P, T, R>& params,
+       detail::error_property_not_found)
+      {
+        std::vector<default_color_type> color_vec(num_vertices(g));
+        null_visitor null_vis;
+        
+        neighbor_bfs_helper
+          (g, s, 
+           make_iterator_property_map
+           (color_vec.begin(), 
+            choose_const_pmap(get_param(params, vertex_index), 
+                              g, vertex_index), color_vec[0]),
+           choose_param(get_param(params, graph_visitor),
+                        make_neighbor_bfs_visitor(null_vis)),
+           params);
+      }
+    };
+
+  } // namespace detail
+
+
+  // Named Parameter Variant
+  template <class VertexListGraph, class P, class T, class R>
+  void neighbor_breadth_first_search
+    (const VertexListGraph& g,
+     typename graph_traits<VertexListGraph>::vertex_descriptor s,
+     const bgl_named_params<P, T, R>& params)
+  {
+    // The graph is passed by *const* reference so that graph adaptors
+    // (temporaries) can be passed into this function. However, the
+    // graph is not really const since we may write to property maps
+    // of the graph.
+    VertexListGraph& ng = const_cast<VertexListGraph&>(g);
+    typedef typename property_value< bgl_named_params<P,T,R>, 
+      vertex_color_t>::type C;
+    detail::neighbor_bfs_dispatch<C>::apply(ng, s, params, 
+                                            get_param(params, vertex_color));
+  }
+
+
+  // This version does not initialize colors, user has to.
+
+  template <class IncidenceGraph, class P, class T, class R>
+  void neighbor_breadth_first_visit
+    (IncidenceGraph& g,
+     typename graph_traits<IncidenceGraph>::vertex_descriptor s,
+     const bgl_named_params<P, T, R>& params)
+  {
+    typedef graph_traits<IncidenceGraph> Traits;
+    // Buffer default
+    typedef boost::queue<typename Traits::vertex_descriptor> queue_t;
+    queue_t Q;
+
+    detail::neighbor_bfs_impl
+      (g, s,
+       choose_param(get_param(params, buffer_param_t()), boost::ref(Q)).get(),
+       choose_param(get_param(params, graph_visitor),
+                    make_neighbor_bfs_visitor(null_visitor())),
+       choose_pmap(get_param(params, vertex_color), g, vertex_color)
+       );
+  }
+
+} // namespace boost
+
+#endif // BOOST_GRAPH_NEIGHBOR_BREADTH_FIRST_SEARCH_HPP
+