third_party/boost/include/boost/graph/depth_first_search.hpp - webm/webmlive - Git at Google

 //=======================================================================
 // Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
 // Copyright 2003 Bruce Barr
 // 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)
 //=======================================================================

 // Nonrecursive implementation of depth_first_visit_impl submitted by
 // Bruce Barr, schmoost <at> yahoo.com, May/June 2003.
 #ifndef BOOST_GRAPH_RECURSIVE_DFS_HPP
 #define BOOST_GRAPH_RECURSIVE_DFS_HPP

 #include <boost/config.hpp>
 #include <boost/graph/graph_traits.hpp>
 #include <boost/graph/graph_concepts.hpp>
 #include <boost/graph/properties.hpp>
 #include <boost/graph/visitors.hpp>
 #include <boost/graph/named_function_params.hpp>
 #include <boost/ref.hpp>
 #include <boost/implicit_cast.hpp>

 #include <vector>
 #include <utility>

 namespace boost {

   template <class Visitor, class Graph>
   class DFSVisitorConcept {
   public:
     void constraints() {
       function_requires< CopyConstructibleConcept<Visitor> >();
       vis.initialize_vertex(u, g);
       vis.start_vertex(u, g);
       vis.discover_vertex(u, g);
       vis.examine_edge(e, g);
       vis.tree_edge(e, g);
       vis.back_edge(e, g);
       vis.forward_or_cross_edge(e, g);
       vis.finish_vertex(u, g);
     }
   private:
     Visitor vis;
     Graph g;
     typename graph_traits<Graph>::vertex_descriptor u;
     typename graph_traits<Graph>::edge_descriptor e;
   };

   namespace detail {

     struct nontruth2 {
       template<class T, class T2>
       bool operator()(const T&, const T2&) const { return false; }
     };


 // Define BOOST_RECURSIVE_DFS to use older, recursive version.
 // It is retained for a while in order to perform performance
 // comparison.
 #ifndef BOOST_RECURSIVE_DFS

     // If the vertex u and the iterators ei and ei_end are thought of as the
     // context of the algorithm, each push and pop from the stack could
     // be thought of as a context shift.
     // Each pass through "while (ei != ei_end)" may refer to the out-edges of
     // an entirely different vertex, because the context of the algorithm
     // shifts every time a white adjacent vertex is discovered.
     // The corresponding context shift back from the adjacent vertex occurs
     // after all of its out-edges have been examined.
     //
     // See http://lists.boost.org/MailArchives/boost/msg48752.php for FAQ.

     template <class IncidenceGraph, class DFSVisitor, class ColorMap,
             class TerminatorFunc>
     void depth_first_visit_impl
       (const IncidenceGraph& g,
        typename graph_traits<IncidenceGraph>::vertex_descriptor u,
        DFSVisitor& vis,
        ColorMap color, TerminatorFunc func = TerminatorFunc())
     {
       function_requires<IncidenceGraphConcept<IncidenceGraph> >();
       function_requires<DFSVisitorConcept<DFSVisitor, IncidenceGraph> >();
       typedef typename graph_traits<IncidenceGraph>::vertex_descriptor Vertex;
       function_requires< ReadWritePropertyMapConcept<ColorMap, Vertex> >();
       typedef typename property_traits<ColorMap>::value_type ColorValue;
       function_requires< ColorValueConcept<ColorValue> >();
       typedef color_traits<ColorValue> Color;
       typedef typename graph_traits<IncidenceGraph>::out_edge_iterator Iter;
       typedef std::pair<Vertex, std::pair<Iter, Iter> > VertexInfo;

       Iter ei, ei_end;
       std::vector<VertexInfo> stack;

       // Possible optimization for vector
       //stack.reserve(num_vertices(g));

       typedef typename unwrap_reference<TerminatorFunc>::type TF;

       put(color, u, Color::gray());
       vis.discover_vertex(u, g);
       boost::tie(ei, ei_end) = out_edges(u, g);
       // Variable is needed to workaround a borland bug.
       TF& fn = static_cast<TF&>(func);
       if (fn(u, g)) {
           // If this vertex terminates the search, we push empty range
           stack.push_back(std::make_pair(u, std::make_pair(ei_end, ei_end)));
       } else {
           stack.push_back(std::make_pair(u, std::make_pair(ei, ei_end)));
       }
       while (!stack.empty()) {
         VertexInfo& back = stack.back();
         u = back.first;
         boost::tie(ei, ei_end) = back.second;
         stack.pop_back();
         while (ei != ei_end) {
           Vertex v = target(*ei, g);
           vis.examine_edge(*ei, g);
           ColorValue v_color = get(color, v);
           if (v_color == Color::white()) {
             vis.tree_edge(*ei, g);
             stack.push_back(std::make_pair(u, std::make_pair(++ei, ei_end)));
             u = v;
             put(color, u, Color::gray());
             vis.discover_vertex(u, g);
             boost::tie(ei, ei_end) = out_edges(u, g);
             if (fn(u, g)) {
                 ei = ei_end;
             }
           } else if (v_color == Color::gray()) {
             vis.back_edge(*ei, g);
             ++ei;
           } else {
             vis.forward_or_cross_edge(*ei, g);
             ++ei;
           }
         }
         put(color, u, Color::black());
         vis.finish_vertex(u, g);
       }
     }

 #else // BOOST_RECURSIVE_DFS is defined

     template <class IncidenceGraph, class DFSVisitor, class ColorMap,
               class TerminatorFunc>
     void depth_first_visit_impl
       (const IncidenceGraph& g,
        typename graph_traits<IncidenceGraph>::vertex_descriptor u,
        DFSVisitor& vis,  // pass-by-reference here, important!
        ColorMap color, TerminatorFunc func)
     {
       function_requires<IncidenceGraphConcept<IncidenceGraph> >();
       function_requires<DFSVisitorConcept<DFSVisitor, IncidenceGraph> >();
       typedef typename graph_traits<IncidenceGraph>::vertex_descriptor Vertex;
       function_requires< ReadWritePropertyMapConcept<ColorMap, Vertex> >();
       typedef typename property_traits<ColorMap>::value_type ColorValue;
       function_requires< ColorValueConcept<ColorValue> >();
       typedef color_traits<ColorValue> Color;
       typename graph_traits<IncidenceGraph>::out_edge_iterator ei, ei_end;

       put(color, u, Color::gray());          vis.discover_vertex(u, g);

       typedef typename unwrap_reference<TerminatorFunc>::type TF;
       // Variable is needed to workaround a borland bug.
       TF& fn = static_cast<TF&>(func);
       if (!fn(u, g))
         for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) {
           Vertex v = target(*ei, g);           vis.examine_edge(*ei, g);
           ColorValue v_color = get(color, v);
           if (v_color == Color::white()) {     vis.tree_edge(*ei, g);
           depth_first_visit_impl(g, v, vis, color, func);
           } else if (v_color == Color::gray()) vis.back_edge(*ei, g);
           else                                 vis.forward_or_cross_edge(*ei, g);
         }
       put(color, u, Color::black());         vis.finish_vertex(u, g);
     }

 #endif

   } // namespace detail

   template <class VertexListGraph, class DFSVisitor, class ColorMap>
   void
   depth_first_search(const VertexListGraph& g, DFSVisitor vis, ColorMap color,
                      typename graph_traits<VertexListGraph>::vertex_descriptor start_vertex)
   {
     typedef typename graph_traits<VertexListGraph>::vertex_descriptor Vertex;
     function_requires<DFSVisitorConcept<DFSVisitor, VertexListGraph> >();
     typedef typename property_traits<ColorMap>::value_type ColorValue;
     typedef color_traits<ColorValue> Color;

     typename graph_traits<VertexListGraph>::vertex_iterator ui, ui_end;
     for (boost::tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) {
       Vertex u = implicit_cast<Vertex>(*ui);
       put(color, u, Color::white()); vis.initialize_vertex(u, g);
     }

     if (start_vertex != implicit_cast<Vertex>(*vertices(g).first)){ vis.start_vertex(start_vertex, g);
       detail::depth_first_visit_impl(g, start_vertex, vis, color,
                                      detail::nontruth2());
     }

     for (boost::tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) {
       Vertex u = implicit_cast<Vertex>(*ui);
       ColorValue u_color = get(color, u);
       if (u_color == Color::white()) {       vis.start_vertex(u, g);
         detail::depth_first_visit_impl(g, u, vis, color, detail::nontruth2());
       }
     }
   }

   template <class VertexListGraph, class DFSVisitor, class ColorMap>
   void
   depth_first_search(const VertexListGraph& g, DFSVisitor vis, ColorMap color)
   {
     typedef typename boost::graph_traits<VertexListGraph>::vertex_iterator vi;
     std::pair<vi, vi> verts = vertices(g);
     if (verts.first == verts.second)
       return;

     depth_first_search(g, vis, color, *verts.first);
   }

   template <class Visitors = null_visitor>
   class dfs_visitor {
   public:
     dfs_visitor() { }
     dfs_visitor(Visitors vis) : m_vis(vis) { }

     template <class Vertex, class Graph>
     void initialize_vertex(Vertex u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_initialize_vertex());
     }
     template <class Vertex, class Graph>
     void start_vertex(Vertex u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_start_vertex());
     }
     template <class Vertex, class Graph>
     void discover_vertex(Vertex u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_discover_vertex());
     }
     template <class Edge, class Graph>
     void examine_edge(Edge u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_examine_edge());
     }
     template <class Edge, class Graph>
     void tree_edge(Edge u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_tree_edge());
     }
     template <class Edge, class Graph>
     void back_edge(Edge u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_back_edge());
     }
     template <class Edge, class Graph>
     void forward_or_cross_edge(Edge u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_forward_or_cross_edge());
     }
     template <class Vertex, class Graph>
     void finish_vertex(Vertex u, const Graph& g) {
       invoke_visitors(m_vis, u, g, ::boost::on_finish_vertex());
     }

     BOOST_GRAPH_EVENT_STUB(on_initialize_vertex,dfs)
     BOOST_GRAPH_EVENT_STUB(on_start_vertex,dfs)
     BOOST_GRAPH_EVENT_STUB(on_discover_vertex,dfs)
     BOOST_GRAPH_EVENT_STUB(on_examine_edge,dfs)
     BOOST_GRAPH_EVENT_STUB(on_tree_edge,dfs)
     BOOST_GRAPH_EVENT_STUB(on_back_edge,dfs)
     BOOST_GRAPH_EVENT_STUB(on_forward_or_cross_edge,dfs)
     BOOST_GRAPH_EVENT_STUB(on_finish_vertex,dfs)

   protected:
     Visitors m_vis;
   };
   template <class Visitors>
   dfs_visitor<Visitors>
   make_dfs_visitor(Visitors vis) {
     return dfs_visitor<Visitors>(vis);
   }
   typedef dfs_visitor<> default_dfs_visitor;

   // Named Parameter Variant
   template <class VertexListGraph, class P, class T, class R>
   void
   depth_first_search(const VertexListGraph& g,
                      const bgl_named_params<P, T, R>& params)
   {
     typedef typename boost::graph_traits<VertexListGraph>::vertex_iterator vi;
     std::pair<vi, vi> verts = vertices(g);
     if (verts.first == verts.second)
       return;
     using namespace boost::graph::keywords;
     typedef bgl_named_params<P, T, R> params_type;
     BOOST_GRAPH_DECLARE_CONVERTED_PARAMETERS(params_type, params)
     depth_first_search
       (g,
        arg_pack[_visitor | make_dfs_visitor(null_visitor())],
        boost::detail::make_color_map_from_arg_pack(g, arg_pack),
        arg_pack[_root_vertex | *vertices(g).first]
       );
   }

   template <class IncidenceGraph, class DFSVisitor, class ColorMap>
   void depth_first_visit
     (const IncidenceGraph& g,
      typename graph_traits<IncidenceGraph>::vertex_descriptor u,
      DFSVisitor vis, ColorMap color)
   {
     vis.start_vertex(u, g);
     detail::depth_first_visit_impl(g, u, vis, color, detail::nontruth2());
   }

   template <class IncidenceGraph, class DFSVisitor, class ColorMap,
             class TerminatorFunc>
   void depth_first_visit
     (const IncidenceGraph& g,
      typename graph_traits<IncidenceGraph>::vertex_descriptor u,
      DFSVisitor vis, ColorMap color, TerminatorFunc func = TerminatorFunc())
   {
     vis.start_vertex(u, g);
     detail::depth_first_visit_impl(g, u, vis, color, func);
   }
 } // namespace boost

 #ifdef BOOST_GRAPH_USE_MPI
 #  include <boost/graph/distributed/depth_first_search.hpp>
 #endif

 #endif
	//=======================================================================
	// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
	// Copyright 2003 Bruce Barr
	// 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)
	//=======================================================================

	// Nonrecursive implementation of depth_first_visit_impl submitted by
	// Bruce Barr, schmoost <at> yahoo.com, May/June 2003.
	#ifndef BOOST_GRAPH_RECURSIVE_DFS_HPP
	#define BOOST_GRAPH_RECURSIVE_DFS_HPP

	#include <boost/config.hpp>
	#include <boost/graph/graph_traits.hpp>
	#include <boost/graph/graph_concepts.hpp>
	#include <boost/graph/properties.hpp>
	#include <boost/graph/visitors.hpp>
	#include <boost/graph/named_function_params.hpp>
	#include <boost/ref.hpp>
	#include <boost/implicit_cast.hpp>

	#include <vector>
	#include <utility>

	namespace boost {

	template <class Visitor, class Graph>
	class DFSVisitorConcept {
	public:
	void constraints() {
	function_requires< CopyConstructibleConcept<Visitor> >();
	vis.initialize_vertex(u, g);
	vis.start_vertex(u, g);
	vis.discover_vertex(u, g);
	vis.examine_edge(e, g);
	vis.tree_edge(e, g);
	vis.back_edge(e, g);
	vis.forward_or_cross_edge(e, g);
	vis.finish_vertex(u, g);
	}
	private:
	Visitor vis;
	Graph g;
	typename graph_traits<Graph>::vertex_descriptor u;
	typename graph_traits<Graph>::edge_descriptor e;
	};

	namespace detail {

	struct nontruth2 {
	template<class T, class T2>
	bool operator()(const T&, const T2&) const { return false; }
	};


	// Define BOOST_RECURSIVE_DFS to use older, recursive version.
	// It is retained for a while in order to perform performance
	// comparison.
	#ifndef BOOST_RECURSIVE_DFS

	// If the vertex u and the iterators ei and ei_end are thought of as the
	// context of the algorithm, each push and pop from the stack could
	// be thought of as a context shift.
	// Each pass through "while (ei != ei_end)" may refer to the out-edges of
	// an entirely different vertex, because the context of the algorithm
	// shifts every time a white adjacent vertex is discovered.
	// The corresponding context shift back from the adjacent vertex occurs
	// after all of its out-edges have been examined.
	//
	// See http://lists.boost.org/MailArchives/boost/msg48752.php for FAQ.

	template <class IncidenceGraph, class DFSVisitor, class ColorMap,
	class TerminatorFunc>
	void depth_first_visit_impl
	(const IncidenceGraph& g,
	typename graph_traits<IncidenceGraph>::vertex_descriptor u,
	DFSVisitor& vis,
	ColorMap color, TerminatorFunc func = TerminatorFunc())
	{
	function_requires<IncidenceGraphConcept<IncidenceGraph> >();
	function_requires<DFSVisitorConcept<DFSVisitor, IncidenceGraph> >();
	typedef typename graph_traits<IncidenceGraph>::vertex_descriptor Vertex;
	function_requires< ReadWritePropertyMapConcept<ColorMap, Vertex> >();
	typedef typename property_traits<ColorMap>::value_type ColorValue;
	function_requires< ColorValueConcept<ColorValue> >();
	typedef color_traits<ColorValue> Color;
	typedef typename graph_traits<IncidenceGraph>::out_edge_iterator Iter;
	typedef std::pair<Vertex, std::pair<Iter, Iter> > VertexInfo;

	Iter ei, ei_end;
	std::vector<VertexInfo> stack;

	// Possible optimization for vector
	//stack.reserve(num_vertices(g));

	typedef typename unwrap_reference<TerminatorFunc>::type TF;

	put(color, u, Color::gray());
	vis.discover_vertex(u, g);
	boost::tie(ei, ei_end) = out_edges(u, g);
	// Variable is needed to workaround a borland bug.
	TF& fn = static_cast<TF&>(func);
	if (fn(u, g)) {
	// If this vertex terminates the search, we push empty range
	stack.push_back(std::make_pair(u, std::make_pair(ei_end, ei_end)));
	} else {
	stack.push_back(std::make_pair(u, std::make_pair(ei, ei_end)));
	}
	while (!stack.empty()) {
	VertexInfo& back = stack.back();
	u = back.first;
	boost::tie(ei, ei_end) = back.second;
	stack.pop_back();
	while (ei != ei_end) {
	Vertex v = target(*ei, g);
	vis.examine_edge(*ei, g);
	ColorValue v_color = get(color, v);
	if (v_color == Color::white()) {
	vis.tree_edge(*ei, g);
	stack.push_back(std::make_pair(u, std::make_pair(++ei, ei_end)));
	u = v;
	put(color, u, Color::gray());
	vis.discover_vertex(u, g);
	boost::tie(ei, ei_end) = out_edges(u, g);
	if (fn(u, g)) {
	ei = ei_end;
	}
	} else if (v_color == Color::gray()) {
	vis.back_edge(*ei, g);
	++ei;
	} else {
	vis.forward_or_cross_edge(*ei, g);
	++ei;
	}
	}
	put(color, u, Color::black());
	vis.finish_vertex(u, g);
	}
	}

	#else // BOOST_RECURSIVE_DFS is defined

	template <class IncidenceGraph, class DFSVisitor, class ColorMap,
	class TerminatorFunc>
	void depth_first_visit_impl
	(const IncidenceGraph& g,
	typename graph_traits<IncidenceGraph>::vertex_descriptor u,
	DFSVisitor& vis, // pass-by-reference here, important!
	ColorMap color, TerminatorFunc func)
	{
	function_requires<IncidenceGraphConcept<IncidenceGraph> >();
	function_requires<DFSVisitorConcept<DFSVisitor, IncidenceGraph> >();
	typedef typename graph_traits<IncidenceGraph>::vertex_descriptor Vertex;
	function_requires< ReadWritePropertyMapConcept<ColorMap, Vertex> >();
	typedef typename property_traits<ColorMap>::value_type ColorValue;
	function_requires< ColorValueConcept<ColorValue> >();
	typedef color_traits<ColorValue> Color;
	typename graph_traits<IncidenceGraph>::out_edge_iterator ei, ei_end;

	put(color, u, Color::gray()); vis.discover_vertex(u, g);

	typedef typename unwrap_reference<TerminatorFunc>::type TF;
	// Variable is needed to workaround a borland bug.
	TF& fn = static_cast<TF&>(func);
	if (!fn(u, g))
	for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) {
	Vertex v = target(ei, g); vis.examine_edge(ei, g);
	ColorValue v_color = get(color, v);
	if (v_color == Color::white()) { vis.tree_edge(*ei, g);
	depth_first_visit_impl(g, v, vis, color, func);
	} else if (v_color == Color::gray()) vis.back_edge(*ei, g);
	else vis.forward_or_cross_edge(*ei, g);
	}
	put(color, u, Color::black()); vis.finish_vertex(u, g);
	}

	#endif

	} // namespace detail

	template <class VertexListGraph, class DFSVisitor, class ColorMap>
	void
	depth_first_search(const VertexListGraph& g, DFSVisitor vis, ColorMap color,
	typename graph_traits<VertexListGraph>::vertex_descriptor start_vertex)
	{
	typedef typename graph_traits<VertexListGraph>::vertex_descriptor Vertex;
	function_requires<DFSVisitorConcept<DFSVisitor, VertexListGraph> >();
	typedef typename property_traits<ColorMap>::value_type ColorValue;
	typedef color_traits<ColorValue> Color;

	typename graph_traits<VertexListGraph>::vertex_iterator ui, ui_end;
	for (boost::tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) {
	Vertex u = implicit_cast<Vertex>(*ui);
	put(color, u, Color::white()); vis.initialize_vertex(u, g);
	}

	if (start_vertex != implicit_cast<Vertex>(*vertices(g).first)){ vis.start_vertex(start_vertex, g);
	detail::depth_first_visit_impl(g, start_vertex, vis, color,
	detail::nontruth2());
	}

	for (boost::tie(ui, ui_end) = vertices(g); ui != ui_end; ++ui) {
	Vertex u = implicit_cast<Vertex>(*ui);
	ColorValue u_color = get(color, u);
	if (u_color == Color::white()) { vis.start_vertex(u, g);
	detail::depth_first_visit_impl(g, u, vis, color, detail::nontruth2());
	}
	}
	}

	template <class VertexListGraph, class DFSVisitor, class ColorMap>
	void
	depth_first_search(const VertexListGraph& g, DFSVisitor vis, ColorMap color)
	{
	typedef typename boost::graph_traits<VertexListGraph>::vertex_iterator vi;
	std::pair<vi, vi> verts = vertices(g);
	if (verts.first == verts.second)
	return;

	depth_first_search(g, vis, color, *verts.first);
	}

	template <class Visitors = null_visitor>
	class dfs_visitor {
	public:
	dfs_visitor() { }
	dfs_visitor(Visitors vis) : m_vis(vis) { }

	template <class Vertex, class Graph>
	void initialize_vertex(Vertex u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_initialize_vertex());
	}
	template <class Vertex, class Graph>
	void start_vertex(Vertex u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_start_vertex());
	}
	template <class Vertex, class Graph>
	void discover_vertex(Vertex u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_discover_vertex());
	}
	template <class Edge, class Graph>
	void examine_edge(Edge u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_examine_edge());
	}
	template <class Edge, class Graph>
	void tree_edge(Edge u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_tree_edge());
	}
	template <class Edge, class Graph>
	void back_edge(Edge u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_back_edge());
	}
	template <class Edge, class Graph>
	void forward_or_cross_edge(Edge u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_forward_or_cross_edge());
	}
	template <class Vertex, class Graph>
	void finish_vertex(Vertex u, const Graph& g) {
	invoke_visitors(m_vis, u, g, ::boost::on_finish_vertex());
	}

	BOOST_GRAPH_EVENT_STUB(on_initialize_vertex,dfs)
	BOOST_GRAPH_EVENT_STUB(on_start_vertex,dfs)
	BOOST_GRAPH_EVENT_STUB(on_discover_vertex,dfs)
	BOOST_GRAPH_EVENT_STUB(on_examine_edge,dfs)
	BOOST_GRAPH_EVENT_STUB(on_tree_edge,dfs)
	BOOST_GRAPH_EVENT_STUB(on_back_edge,dfs)
	BOOST_GRAPH_EVENT_STUB(on_forward_or_cross_edge,dfs)
	BOOST_GRAPH_EVENT_STUB(on_finish_vertex,dfs)

	protected:
	Visitors m_vis;
	};
	template <class Visitors>
	dfs_visitor<Visitors>
	make_dfs_visitor(Visitors vis) {
	return dfs_visitor<Visitors>(vis);
	}
	typedef dfs_visitor<> default_dfs_visitor;

	// Named Parameter Variant
	template <class VertexListGraph, class P, class T, class R>
	void
	depth_first_search(const VertexListGraph& g,
	const bgl_named_params<P, T, R>& params)
	{
	typedef typename boost::graph_traits<VertexListGraph>::vertex_iterator vi;
	std::pair<vi, vi> verts = vertices(g);
	if (verts.first == verts.second)
	return;
	using namespace boost::graph::keywords;
	typedef bgl_named_params<P, T, R> params_type;
	BOOST_GRAPH_DECLARE_CONVERTED_PARAMETERS(params_type, params)
	depth_first_search
	(g,
	arg_pack[_visitor \| make_dfs_visitor(null_visitor())],
	boost::detail::make_color_map_from_arg_pack(g, arg_pack),
	arg_pack[_root_vertex \| *vertices(g).first]
	);
	}

	template <class IncidenceGraph, class DFSVisitor, class ColorMap>
	void depth_first_visit
	(const IncidenceGraph& g,
	typename graph_traits<IncidenceGraph>::vertex_descriptor u,
	DFSVisitor vis, ColorMap color)
	{
	vis.start_vertex(u, g);
	detail::depth_first_visit_impl(g, u, vis, color, detail::nontruth2());
	}

	template <class IncidenceGraph, class DFSVisitor, class ColorMap,
	class TerminatorFunc>
	void depth_first_visit
	(const IncidenceGraph& g,
	typename graph_traits<IncidenceGraph>::vertex_descriptor u,
	DFSVisitor vis, ColorMap color, TerminatorFunc func = TerminatorFunc())
	{
	vis.start_vertex(u, g);
	detail::depth_first_visit_impl(g, u, vis, color, func);
	}
	} // namespace boost

	#ifdef BOOST_GRAPH_USE_MPI
	# include <boost/graph/distributed/depth_first_search.hpp>
	#endif

	#endif