alpar@906: /* -*- C++ -*-
alpar@906:  *
alpar@1956:  * This file is a part of LEMON, a generic C++ optimization library
alpar@1956:  *
alpar@2553:  * Copyright (C) 2003-2008
alpar@1956:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
alpar@1359:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
alpar@906:  *
alpar@906:  * Permission to use, modify and distribute this software is granted
alpar@906:  * provided that this copyright notice appears in all copies. For
alpar@906:  * precise terms see the accompanying LICENSE file.
alpar@906:  *
alpar@906:  * This software is provided "AS IS" with no warranty of any kind,
alpar@906:  * express or implied, and with no claim as to its suitability for any
alpar@906:  * purpose.
alpar@906:  *
alpar@906:  */
alpar@906: 
alpar@921: #ifndef LEMON_DIJKSTRA_H
alpar@921: #define LEMON_DIJKSTRA_H
alpar@255: 
deba@2376: ///\ingroup shortest_path
alpar@255: ///\file
alpar@255: ///\brief Dijkstra algorithm.
alpar@1283: ///
alpar@255: 
alpar@953: #include <lemon/list_graph.h>
alpar@921: #include <lemon/bin_heap.h>
deba@2335: #include <lemon/bits/path_dump.h>
deba@1993: #include <lemon/bits/invalid.h>
alpar@1119: #include <lemon/error.h>
alpar@1119: #include <lemon/maps.h>
alpar@255: 
deba@2335: 
alpar@921: namespace lemon {
jacint@385: 
deba@2537:   /// \brief Default OperationTraits for the Dijkstra algorithm class.
deba@2537:   ///  
deba@2537:   /// It defines all computational operations and constants which are
deba@2537:   /// used in the Dijkstra algorithm.
deba@2537:   template <typename Value>
deba@2537:   struct DijkstraDefaultOperationTraits {
deba@2537:     /// \brief Gives back the zero value of the type.
deba@2537:     static Value zero() {
deba@2537:       return static_cast<Value>(0);
deba@2537:     }
deba@2537:     /// \brief Gives back the sum of the given two elements.
deba@2537:     static Value plus(const Value& left, const Value& right) {
deba@2537:       return left + right;
deba@2537:     }
deba@2537:     /// \brief Gives back true only if the first value less than the second.
deba@2537:     static bool less(const Value& left, const Value& right) {
deba@2537:       return left < right;
deba@2537:     }
deba@2537:   };
deba@2537: 
deba@2537:   /// \brief Widest path OperationTraits for the Dijkstra algorithm class.
deba@2537:   ///  
deba@2537:   /// It defines all computational operations and constants which are
deba@2537:   /// used in the Dijkstra algorithm for widest path computation.
deba@2537:   template <typename Value>
deba@2537:   struct DijkstraWidestPathOperationTraits {
deba@2537:     /// \brief Gives back the maximum value of the type.
deba@2537:     static Value zero() {
deba@2537:       return std::numeric_limits<Value>::max();
deba@2537:     }
deba@2538:     /// \brief Gives back the minimum of the given two elements.
deba@2537:     static Value plus(const Value& left, const Value& right) {
deba@2537:       return std::min(left, right);
deba@2537:     }
deba@2537:     /// \brief Gives back true only if the first value less than the second.
deba@2537:     static bool less(const Value& left, const Value& right) {
deba@2537:       return left < right;
deba@2537:     }
deba@2537:   };
alpar@1151:   
alpar@954:   ///Default traits class of Dijkstra class.
alpar@954: 
alpar@954:   ///Default traits class of Dijkstra class.
alpar@954:   ///\param GR Graph type.
alpar@954:   ///\param LM Type of length map.
alpar@953:   template<class GR, class LM>
alpar@953:   struct DijkstraDefaultTraits
alpar@953:   {
alpar@954:     ///The graph type the algorithm runs on. 
alpar@953:     typedef GR Graph;
alpar@953:     ///The type of the map that stores the edge lengths.
alpar@953: 
hegyi@1124:     ///The type of the map that stores the edge lengths.
alpar@2260:     ///It must meet the \ref concepts::ReadMap "ReadMap" concept.
alpar@953:     typedef LM LengthMap;
alpar@954:     //The type of the length of the edges.
alpar@987:     typedef typename LM::Value Value;
deba@2537:     /// Operation traits for Dijkstra algorithm.
deba@2537: 
deba@2537:     /// It defines the used operation by the algorithm.
deba@2537:     /// \see DijkstraDefaultOperationTraits
deba@2537:     typedef DijkstraDefaultOperationTraits<Value> OperationTraits;
deba@1721:     /// The cross reference type used by heap.
deba@1721: 
deba@2537: 
deba@1721:     /// The cross reference type used by heap.
deba@1721:     /// Usually it is \c Graph::NodeMap<int>.
deba@1721:     typedef typename Graph::template NodeMap<int> HeapCrossRef;
deba@1721:     ///Instantiates a HeapCrossRef.
deba@1721: 
deba@2537:     ///This function instantiates a \c HeapCrossRef. 
deba@1721:     /// \param G is the graph, to which we would like to define the 
deba@1721:     /// HeapCrossRef.
deba@1721:     static HeapCrossRef *createHeapCrossRef(const GR &G) 
deba@1721:     {
deba@1721:       return new HeapCrossRef(G);
deba@1721:     }
deba@1721:     
alpar@954:     ///The heap type used by Dijkstra algorithm.
alpar@967: 
alpar@967:     ///The heap type used by Dijkstra algorithm.
alpar@967:     ///
alpar@967:     ///\sa BinHeap
alpar@967:     ///\sa Dijkstra
mqrelly@2263:     typedef BinHeap<typename LM::Value, HeapCrossRef, std::less<Value> > Heap;
alpar@953: 
deba@1721:     static Heap *createHeap(HeapCrossRef& R) 
deba@1721:     {
deba@1721:       return new Heap(R);
deba@1721:     }
deba@1721: 
alpar@953:     ///\brief The type of the map that stores the last
alpar@953:     ///edges of the shortest paths.
alpar@953:     /// 
hegyi@1124:     ///The type of the map that stores the last
hegyi@1124:     ///edges of the shortest paths.
alpar@2260:     ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
alpar@953:     ///
alpar@954:     typedef typename Graph::template NodeMap<typename GR::Edge> PredMap;
alpar@954:     ///Instantiates a PredMap.
alpar@953:  
deba@2537:     ///This function instantiates a \c PredMap. 
hegyi@1123:     ///\param G is the graph, to which we would like to define the PredMap.
alpar@1119:     ///\todo The graph alone may be insufficient for the initialization
alpar@954:     static PredMap *createPredMap(const GR &G) 
alpar@953:     {
alpar@953:       return new PredMap(G);
alpar@953:     }
alpar@1119: 
alpar@1218:     ///The type of the map that stores whether a nodes is processed.
alpar@1119:  
alpar@1218:     ///The type of the map that stores whether a nodes is processed.
alpar@2260:     ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
alpar@1119:     ///By default it is a NullMap.
alpar@1218:     ///\todo If it is set to a real map,
alpar@1218:     ///Dijkstra::processed() should read this.
alpar@1119:     ///\todo named parameter to set this type, function to read and write.
alpar@1218:     typedef NullMap<typename Graph::Node,bool> ProcessedMap;
alpar@1218:     ///Instantiates a ProcessedMap.
alpar@1119:  
deba@2537:     ///This function instantiates a \c ProcessedMap. 
alpar@1536:     ///\param g is the graph, to which
deba@2537:     ///we would like to define the \c ProcessedMap
alpar@1536: #ifdef DOXYGEN
alpar@1536:     static ProcessedMap *createProcessedMap(const GR &g)
alpar@1536: #else
alpar@1366:     static ProcessedMap *createProcessedMap(const GR &)
alpar@1536: #endif
alpar@1119:     {
alpar@1218:       return new ProcessedMap();
alpar@1119:     }
alpar@953:     ///The type of the map that stores the dists of the nodes.
alpar@953:  
hegyi@1124:     ///The type of the map that stores the dists of the nodes.
alpar@2260:     ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
alpar@953:     ///
alpar@987:     typedef typename Graph::template NodeMap<typename LM::Value> DistMap;
alpar@954:     ///Instantiates a DistMap.
alpar@953:  
hegyi@1123:     ///This function instantiates a \ref DistMap. 
hegyi@1123:     ///\param G is the graph, to which we would like to define the \ref DistMap
alpar@954:     static DistMap *createDistMap(const GR &G)
alpar@953:     {
alpar@953:       return new DistMap(G);
alpar@953:     }
alpar@953:   };
alpar@953:   
alpar@255:   ///%Dijkstra algorithm class.
alpar@1125:   
deba@2376:   /// \ingroup shortest_path
alpar@255:   ///This class provides an efficient implementation of %Dijkstra algorithm.
alpar@255:   ///The edge lengths are passed to the algorithm using a
alpar@2260:   ///\ref concepts::ReadMap "ReadMap",
alpar@255:   ///so it is easy to change it to any kind of length.
alpar@255:   ///
alpar@880:   ///The type of the length is determined by the
alpar@2260:   ///\ref concepts::ReadMap::Value "Value" of the length map.
alpar@255:   ///
alpar@255:   ///It is also possible to change the underlying priority heap.
alpar@255:   ///
alpar@1218:   ///\param GR The graph type the algorithm runs on. The default value
alpar@1218:   ///is \ref ListGraph. The value of GR is not used directly by
alpar@1218:   ///Dijkstra, it is only passed to \ref DijkstraDefaultTraits.
alpar@1218:   ///\param LM This read-only EdgeMap determines the lengths of the
alpar@1218:   ///edges. It is read once for each edge, so the map may involve in
alpar@1218:   ///relatively time consuming process to compute the edge length if
alpar@1218:   ///it is necessary. The default map type is \ref
alpar@2260:   ///concepts::Graph::EdgeMap "Graph::EdgeMap<int>".  The value
alpar@1218:   ///of LM is not used directly by Dijkstra, it is only passed to \ref
alpar@1218:   ///DijkstraDefaultTraits.  \param TR Traits class to set
alpar@1218:   ///various data types used by the algorithm.  The default traits
alpar@1218:   ///class is \ref DijkstraDefaultTraits
alpar@1218:   ///"DijkstraDefaultTraits<GR,LM>".  See \ref
alpar@1218:   ///DijkstraDefaultTraits for the documentation of a Dijkstra traits
alpar@1218:   ///class.
alpar@456:   ///
alpar@689:   ///\author Jacint Szabo and Alpar Juttner
alpar@584: 
alpar@255: #ifdef DOXYGEN
deba@2537:   template <typename GR, typename LM, typename TR>
alpar@255: #else
alpar@953:   template <typename GR=ListGraph,
alpar@584: 	    typename LM=typename GR::template EdgeMap<int>,
alpar@953: 	    typename TR=DijkstraDefaultTraits<GR,LM> >
alpar@255: #endif
alpar@1116:   class Dijkstra {
alpar@255:   public:
alpar@1125:     /**
alpar@1125:      * \brief \ref Exception for uninitialized parameters.
alpar@1125:      *
alpar@1125:      * This error represents problems in the initialization
alpar@1125:      * of the parameters of the algorithms.
alpar@1125:      */
alpar@1125:     class UninitializedParameter : public lemon::UninitializedParameter {
alpar@1125:     public:
alpar@2151:       virtual const char* what() const throw() {
alpar@1218: 	return "lemon::Dijkstra::UninitializedParameter";
alpar@1125:       }
alpar@1125:     };
alpar@1119: 
alpar@953:     typedef TR Traits;
alpar@584:     ///The type of the underlying graph.
alpar@954:     typedef typename TR::Graph Graph;
alpar@911:     ///\e
alpar@255:     typedef typename Graph::Node Node;
alpar@911:     ///\e
alpar@255:     typedef typename Graph::NodeIt NodeIt;
alpar@911:     ///\e
alpar@255:     typedef typename Graph::Edge Edge;
alpar@911:     ///\e
alpar@255:     typedef typename Graph::OutEdgeIt OutEdgeIt;
alpar@255:     
alpar@584:     ///The type of the length of the edges.
alpar@987:     typedef typename TR::LengthMap::Value Value;
alpar@693:     ///The type of the map that stores the edge lengths.
alpar@954:     typedef typename TR::LengthMap LengthMap;
alpar@693:     ///\brief The type of the map that stores the last
alpar@584:     ///edges of the shortest paths.
alpar@953:     typedef typename TR::PredMap PredMap;
alpar@1218:     ///The type of the map indicating if a node is processed.
alpar@1218:     typedef typename TR::ProcessedMap ProcessedMap;
alpar@693:     ///The type of the map that stores the dists of the nodes.
alpar@953:     typedef typename TR::DistMap DistMap;
deba@1721:     ///The cross reference type used for the current heap.
deba@1721:     typedef typename TR::HeapCrossRef HeapCrossRef;
alpar@953:     ///The heap type used by the dijkstra algorithm.
alpar@953:     typedef typename TR::Heap Heap;
deba@2537:     ///The operation traits.
deba@2537:     typedef typename TR::OperationTraits OperationTraits;
alpar@255:   private:
alpar@802:     /// Pointer to the underlying graph.
alpar@688:     const Graph *G;
alpar@802:     /// Pointer to the length map
alpar@954:     const LengthMap *length;
alpar@802:     ///Pointer to the map of predecessors edges.
alpar@1119:     PredMap *_pred;
alpar@1119:     ///Indicates if \ref _pred is locally allocated (\c true) or not.
alpar@1119:     bool local_pred;
alpar@802:     ///Pointer to the map of distances.
alpar@1130:     DistMap *_dist;
alpar@1130:     ///Indicates if \ref _dist is locally allocated (\c true) or not.
alpar@1130:     bool local_dist;
alpar@1218:     ///Pointer to the map of processed status of the nodes.
alpar@1218:     ProcessedMap *_processed;
alpar@1218:     ///Indicates if \ref _processed is locally allocated (\c true) or not.
alpar@1218:     bool local_processed;
deba@1721:     ///Pointer to the heap cross references.
deba@1721:     HeapCrossRef *_heap_cross_ref;
deba@1721:     ///Indicates if \ref _heap_cross_ref is locally allocated (\c true) or not.
deba@1721:     bool local_heap_cross_ref;
deba@1721:     ///Pointer to the heap.
deba@1721:     Heap *_heap;
deba@1721:     ///Indicates if \ref _heap is locally allocated (\c true) or not.
deba@1721:     bool local_heap;
alpar@688: 
alpar@1128:     ///Creates the maps if necessary.
alpar@688:     
alpar@688:     ///\todo Better memory allocation (instead of new).
alpar@1128:     void create_maps() 
alpar@688:     {
alpar@1119:       if(!_pred) {
alpar@1119: 	local_pred = true;
alpar@1119: 	_pred = Traits::createPredMap(*G);
alpar@688:       }
alpar@1130:       if(!_dist) {
alpar@1130: 	local_dist = true;
alpar@1130: 	_dist = Traits::createDistMap(*G);
alpar@688:       }
alpar@1218:       if(!_processed) {
alpar@1218: 	local_processed = true;
alpar@1218: 	_processed = Traits::createProcessedMap(*G);
alpar@1119:       }
deba@1721:       if (!_heap_cross_ref) {
deba@1721: 	local_heap_cross_ref = true;
deba@1721: 	_heap_cross_ref = Traits::createHeapCrossRef(*G);
deba@1721:       }
deba@1721:       if (!_heap) {
deba@1721: 	local_heap = true;
deba@1721: 	_heap = Traits::createHeap(*_heap_cross_ref);
deba@1721:       }
alpar@688:     }
alpar@255:     
alpar@255:   public :
deba@1710: 
deba@1710:     typedef Dijkstra Create;
alpar@1116:  
alpar@1128:     ///\name Named template parameters
alpar@1128: 
alpar@1128:     ///@{
alpar@1128: 
alpar@953:     template <class T>
alpar@1116:     struct DefPredMapTraits : public Traits {
alpar@953:       typedef T PredMap;
klao@2010:       static PredMap *createPredMap(const Graph &)
alpar@953:       {
alpar@1126: 	throw UninitializedParameter();
alpar@953:       }
alpar@953:     };
alpar@954:     ///\ref named-templ-param "Named parameter" for setting PredMap type
alpar@954: 
alpar@954:     ///\ref named-templ-param "Named parameter" for setting PredMap type
alpar@1043:     ///
alpar@953:     template <class T>
deba@1709:     struct DefPredMap 
deba@1709:       : public Dijkstra< Graph,	LengthMap, DefPredMapTraits<T> > {
deba@1709:       typedef Dijkstra< Graph,	LengthMap, DefPredMapTraits<T> > Create;
deba@1709:     };
alpar@953:     
alpar@953:     template <class T>
alpar@1116:     struct DefDistMapTraits : public Traits {
alpar@953:       typedef T DistMap;
klao@2010:       static DistMap *createDistMap(const Graph &)
alpar@953:       {
alpar@1126: 	throw UninitializedParameter();
alpar@953:       }
alpar@953:     };
alpar@954:     ///\ref named-templ-param "Named parameter" for setting DistMap type
alpar@954: 
alpar@954:     ///\ref named-templ-param "Named parameter" for setting DistMap type
alpar@1043:     ///
alpar@953:     template <class T>
deba@1709:     struct DefDistMap 
deba@1709:       : public Dijkstra< Graph, LengthMap, DefDistMapTraits<T> > { 
deba@1709:       typedef Dijkstra< Graph, LengthMap, DefDistMapTraits<T> > Create;
deba@1709:     };
alpar@953:     
alpar@1128:     template <class T>
alpar@1218:     struct DefProcessedMapTraits : public Traits {
alpar@1218:       typedef T ProcessedMap;
alpar@1218:       static ProcessedMap *createProcessedMap(const Graph &G) 
alpar@1128:       {
alpar@1128: 	throw UninitializedParameter();
alpar@1128:       }
alpar@1128:     };
alpar@1218:     ///\ref named-templ-param "Named parameter" for setting ProcessedMap type
alpar@1128: 
alpar@1218:     ///\ref named-templ-param "Named parameter" for setting ProcessedMap type
alpar@1128:     ///
alpar@1128:     template <class T>
deba@1709:     struct DefProcessedMap 
deba@1709:       : public Dijkstra< Graph,	LengthMap, DefProcessedMapTraits<T> > { 
deba@1709:       typedef Dijkstra< Graph,	LengthMap, DefProcessedMapTraits<T> > Create;
deba@1709:     };
alpar@1128:     
alpar@1218:     struct DefGraphProcessedMapTraits : public Traits {
alpar@1218:       typedef typename Graph::template NodeMap<bool> ProcessedMap;
alpar@1218:       static ProcessedMap *createProcessedMap(const Graph &G) 
alpar@1128:       {
alpar@1218: 	return new ProcessedMap(G);
alpar@1128:       }
alpar@1128:     };
alpar@1128:     ///\brief \ref named-templ-param "Named parameter"
alpar@1218:     ///for setting the ProcessedMap type to be Graph::NodeMap<bool>.
alpar@1128:     ///
alpar@1128:     ///\ref named-templ-param "Named parameter"
alpar@1218:     ///for setting the ProcessedMap type to be Graph::NodeMap<bool>.
alpar@1128:     ///If you don't set it explicitely, it will be automatically allocated.
alpar@1128:     template <class T>
deba@1709:     struct DefProcessedMapToBeDefaultMap 
deba@1709:       : public Dijkstra< Graph, LengthMap, DefGraphProcessedMapTraits> {
deba@1709:       typedef Dijkstra< Graph, LengthMap, DefGraphProcessedMapTraits> Create;
deba@1709:     };
deba@1721: 
deba@1721:     template <class H, class CR>
deba@1721:     struct DefHeapTraits : public Traits {
deba@1721:       typedef CR HeapCrossRef;
deba@1721:       typedef H Heap;
deba@1741:       static HeapCrossRef *createHeapCrossRef(const Graph &) {
deba@1741: 	throw UninitializedParameter();
deba@1721:       }
deba@1741:       static Heap *createHeap(HeapCrossRef &) 
deba@1721:       {
deba@1741: 	throw UninitializedParameter();
deba@1721:       }
deba@1721:     };
deba@2230:     ///\brief \ref named-templ-param "Named parameter" for setting
deba@2230:     ///heap and cross reference type
deba@2230:     ///
deba@1721:     ///\ref named-templ-param "Named parameter" for setting heap and cross 
deba@1721:     ///reference type
deba@1721:     ///
deba@1721:     template <class H, class CR = typename Graph::template NodeMap<int> >
deba@1721:     struct DefHeap
deba@1721:       : public Dijkstra< Graph,	LengthMap, DefHeapTraits<H, CR> > { 
deba@1721:       typedef Dijkstra< Graph,	LengthMap, DefHeapTraits<H, CR> > Create;
deba@1721:     };
deba@1741: 
deba@1741:     template <class H, class CR>
deba@1741:     struct DefStandardHeapTraits : public Traits {
deba@1741:       typedef CR HeapCrossRef;
deba@1741:       typedef H Heap;
deba@1741:       static HeapCrossRef *createHeapCrossRef(const Graph &G) {
deba@1741: 	return new HeapCrossRef(G);
deba@1741:       }
deba@1741:       static Heap *createHeap(HeapCrossRef &R) 
deba@1741:       {
deba@1741: 	return new Heap(R);
deba@1741:       }
deba@1741:     };
deba@2230:     ///\brief \ref named-templ-param "Named parameter" for setting
deba@2230:     ///heap and cross reference type with automatic allocation
deba@2230:     ///
deba@1741:     ///\ref named-templ-param "Named parameter" for setting heap and cross 
deba@1741:     ///reference type. It can allocate the heap and the cross reference 
deba@1741:     ///object if the cross reference's constructor waits for the graph as 
deba@1741:     ///parameter and the heap's constructor waits for the cross reference.
deba@1741:     template <class H, class CR = typename Graph::template NodeMap<int> >
deba@1741:     struct DefStandardHeap
deba@1741:       : public Dijkstra< Graph,	LengthMap, DefStandardHeapTraits<H, CR> > { 
deba@1741:       typedef Dijkstra< Graph,	LengthMap, DefStandardHeapTraits<H, CR> > 
deba@1741:       Create;
deba@1741:     };
deba@2537: 
deba@2537:     template <class T>
deba@2537:     struct DefOperationTraitsTraits : public Traits {
deba@2537:       typedef T OperationTraits;
deba@2537:     };
deba@2537:     
deba@2537:     /// \brief \ref named-templ-param "Named parameter" for setting 
deba@2537:     /// OperationTraits type
deba@2537:     ///
deba@2537:     /// \ref named-templ-param "Named parameter" for setting OperationTraits
deba@2537:     /// type
deba@2537:     template <class T>
deba@2537:     struct DefOperationTraits
deba@2537:       : public Dijkstra<Graph, LengthMap, DefOperationTraitsTraits<T> > {
deba@2537:       typedef Dijkstra<Graph, LengthMap, DefOperationTraitsTraits<T> >
deba@2537:       Create;
deba@2537:     };
alpar@1128:     
alpar@1128:     ///@}
alpar@1128: 
alpar@1128: 
deba@1710:   protected:
deba@1710: 
deba@1710:     Dijkstra() {}
deba@1710: 
alpar@1128:   public:      
alpar@1128:     
alpar@802:     ///Constructor.
alpar@255:     
alpar@802:     ///\param _G the graph the algorithm will run on.
alpar@802:     ///\param _length the length map used by the algorithm.
alpar@954:     Dijkstra(const Graph& _G, const LengthMap& _length) :
alpar@688:       G(&_G), length(&_length),
alpar@1119:       _pred(NULL), local_pred(false),
alpar@1130:       _dist(NULL), local_dist(false),
alpar@1218:       _processed(NULL), local_processed(false),
deba@1721:       _heap_cross_ref(NULL), local_heap_cross_ref(false),
deba@1721:       _heap(NULL), local_heap(false)
alpar@688:     { }
alpar@688:     
alpar@802:     ///Destructor.
alpar@688:     ~Dijkstra() 
alpar@688:     {
alpar@1119:       if(local_pred) delete _pred;
alpar@1130:       if(local_dist) delete _dist;
alpar@1218:       if(local_processed) delete _processed;
deba@1721:       if(local_heap_cross_ref) delete _heap_cross_ref;
deba@1721:       if(local_heap) delete _heap;
alpar@688:     }
alpar@688: 
alpar@688:     ///Sets the length map.
alpar@688: 
alpar@688:     ///Sets the length map.
alpar@688:     ///\return <tt> (*this) </tt>
alpar@1116:     Dijkstra &lengthMap(const LengthMap &m) 
alpar@688:     {
alpar@688:       length = &m;
alpar@688:       return *this;
alpar@688:     }
alpar@688: 
alpar@688:     ///Sets the map storing the predecessor edges.
alpar@688: 
alpar@688:     ///Sets the map storing the predecessor edges.
alpar@688:     ///If you don't use this function before calling \ref run(),
alpar@688:     ///it will allocate one. The destuctor deallocates this
alpar@688:     ///automatically allocated map, of course.
alpar@688:     ///\return <tt> (*this) </tt>
alpar@1116:     Dijkstra &predMap(PredMap &m) 
alpar@688:     {
alpar@1119:       if(local_pred) {
alpar@1119: 	delete _pred;
alpar@1119: 	local_pred=false;
alpar@688:       }
alpar@1119:       _pred = &m;
alpar@688:       return *this;
alpar@688:     }
alpar@688: 
alpar@688:     ///Sets the map storing the distances calculated by the algorithm.
alpar@688: 
alpar@688:     ///Sets the map storing the distances calculated by the algorithm.
alpar@688:     ///If you don't use this function before calling \ref run(),
alpar@688:     ///it will allocate one. The destuctor deallocates this
alpar@688:     ///automatically allocated map, of course.
alpar@688:     ///\return <tt> (*this) </tt>
alpar@1116:     Dijkstra &distMap(DistMap &m) 
alpar@688:     {
alpar@1130:       if(local_dist) {
alpar@1130: 	delete _dist;
alpar@1130: 	local_dist=false;
alpar@688:       }
alpar@1130:       _dist = &m;
alpar@688:       return *this;
alpar@688:     }
alpar@694: 
deba@1741:     ///Sets the heap and the cross reference used by algorithm.
deba@1741: 
deba@1741:     ///Sets the heap and the cross reference used by algorithm.
deba@1741:     ///If you don't use this function before calling \ref run(),
deba@1741:     ///it will allocate one. The destuctor deallocates this
deba@1981:     ///automatically allocated heap and cross reference, of course.
deba@1741:     ///\return <tt> (*this) </tt>
deba@2386:     Dijkstra &heap(Heap& hp, HeapCrossRef &cr)
deba@1741:     {
deba@1741:       if(local_heap_cross_ref) {
deba@1741: 	delete _heap_cross_ref;
deba@1741: 	local_heap_cross_ref=false;
deba@1741:       }
deba@2386:       _heap_cross_ref = &cr;
deba@1741:       if(local_heap) {
deba@1741: 	delete _heap;
deba@1741: 	local_heap=false;
deba@1741:       }
deba@2386:       _heap = &hp;
deba@1741:       return *this;
deba@1741:     }
deba@1741: 
alpar@1130:   private:
alpar@1130:     void finalizeNodeData(Node v,Value dst)
alpar@1130:     {
alpar@1218:       _processed->set(v,true);
alpar@1130:       _dist->set(v, dst);
alpar@1130:     }
alpar@1130: 
alpar@1130:   public:
alpar@2354: 
alpar@2354:     typedef PredMapPath<Graph, PredMap> Path;
alpar@2354: 
alpar@1218:     ///\name Execution control
alpar@1128:     ///The simplest way to execute the algorithm is to use
alpar@1156:     ///one of the member functions called \c run(...).
alpar@1128:     ///\n
alpar@1218:     ///If you need more control on the execution,
alpar@1128:     ///first you must call \ref init(), then you can add several source nodes
alpar@1218:     ///with \ref addSource().
alpar@1218:     ///Finally \ref start() will perform the actual path
alpar@1128:     ///computation.
alpar@1128: 
alpar@1128:     ///@{
alpar@1128: 
alpar@1128:     ///Initializes the internal data structures.
alpar@1128: 
alpar@1128:     ///Initializes the internal data structures.
alpar@1128:     ///
alpar@1128:     void init()
alpar@1128:     {
alpar@1128:       create_maps();
deba@1721:       _heap->clear();
alpar@774:       for ( NodeIt u(*G) ; u!=INVALID ; ++u ) {
alpar@1119: 	_pred->set(u,INVALID);
alpar@1218: 	_processed->set(u,false);
deba@1721: 	_heap_cross_ref->set(u,Heap::PRE_HEAP);
alpar@694:       }
alpar@1128:     }
alpar@1128:     
alpar@1128:     ///Adds a new source node.
alpar@1128: 
alpar@1155:     ///Adds a new source node to the priority heap.
alpar@1128:     ///
alpar@1128:     ///The optional second parameter is the initial distance of the node.
alpar@1128:     ///
alpar@1155:     ///It checks if the node has already been added to the heap and
deba@1988:     ///it is pushed to the heap only if either it was not in the heap
deba@1988:     ///or the shortest path found till then is shorter than \c dst.
deba@2537:     void addSource(Node s,Value dst=OperationTraits::zero())
alpar@1128:     {
deba@1721:       if(_heap->state(s) != Heap::IN_HEAP) {
deba@1721: 	_heap->push(s,dst);
deba@2537:       } else if(OperationTraits::less((*_heap)[s], dst)) {
deba@1988: 	_heap->set(s,dst);
alpar@1155: 	_pred->set(s,INVALID);
alpar@1155:       }
alpar@1128:     }
alpar@1128:     
alpar@1155:     ///Processes the next node in the priority heap
alpar@1155: 
alpar@1155:     ///Processes the next node in the priority heap.
alpar@1155:     ///
alpar@1516:     ///\return The processed node.
alpar@1516:     ///
alpar@1155:     ///\warning The priority heap must not be empty!
alpar@1516:     Node processNextNode()
alpar@1128:     {
deba@1721:       Node v=_heap->top(); 
deba@1721:       Value oldvalue=_heap->prio();
deba@1721:       _heap->pop();
alpar@1130:       finalizeNodeData(v,oldvalue);
alpar@694:       
alpar@1128:       for(OutEdgeIt e(*G,v); e!=INVALID; ++e) {
alpar@1128: 	Node w=G->target(e); 
deba@1721: 	switch(_heap->state(w)) {
alpar@1128: 	case Heap::PRE_HEAP:
deba@2537: 	  _heap->push(w,OperationTraits::plus(oldvalue, (*length)[e])); 
alpar@1128: 	  _pred->set(w,e);
alpar@1128: 	  break;
alpar@1128: 	case Heap::IN_HEAP:
deba@2537: 	  {
deba@2537: 	    Value newvalue = OperationTraits::plus(oldvalue, (*length)[e]);
deba@2537: 	    if ( OperationTraits::less(newvalue, (*_heap)[w]) ) {
deba@2537: 	      _heap->decrease(w, newvalue); 
deba@2537: 	      _pred->set(w,e);
deba@2537: 	    }
alpar@694: 	  }
alpar@1128: 	  break;
alpar@1128: 	case Heap::POST_HEAP:
alpar@1128: 	  break;
alpar@694: 	}
alpar@694:       }
alpar@1516:       return v;
alpar@694:     }
alpar@1128: 
alpar@1665:     ///Next node to be processed.
alpar@1665:     
alpar@1665:     ///Next node to be processed.
alpar@1665:     ///
alpar@1665:     ///\return The next node to be processed or INVALID if the priority heap
alpar@1665:     /// is empty.
deba@1694:     Node nextNode()
alpar@1665:     { 
deba@2439:       return !_heap->empty()?_heap->top():INVALID;
alpar@1665:     }
alpar@1665:  
alpar@1218:     ///\brief Returns \c false if there are nodes
alpar@1218:     ///to be processed in the priority heap
alpar@1155:     ///
alpar@1218:     ///Returns \c false if there are nodes
alpar@1218:     ///to be processed in the priority heap
deba@1721:     bool emptyQueue() { return _heap->empty(); }
alpar@1155:     ///Returns the number of the nodes to be processed in the priority heap
alpar@1155: 
alpar@1155:     ///Returns the number of the nodes to be processed in the priority heap
alpar@1155:     ///
deba@1721:     int queueSize() { return _heap->size(); }
alpar@1155:     
alpar@1130:     ///Executes the algorithm.
alpar@1128: 
alpar@1130:     ///Executes the algorithm.
alpar@1128:     ///
alpar@1130:     ///\pre init() must be called and at least one node should be added
alpar@1130:     ///with addSource() before using this function.
alpar@1128:     ///
alpar@1128:     ///This method runs the %Dijkstra algorithm from the root node(s)
alpar@1128:     ///in order to
alpar@1128:     ///compute the
alpar@1128:     ///shortest path to each node. The algorithm computes
alpar@1128:     ///- The shortest path tree.
alpar@1128:     ///- The distance of each node from the root(s).
alpar@1128:     ///
alpar@1128:     void start()
alpar@1128:     {
deba@1721:       while ( !_heap->empty() ) processNextNode();
alpar@1128:     }
alpar@255:     
alpar@1130:     ///Executes the algorithm until \c dest is reached.
alpar@1128: 
alpar@1130:     ///Executes the algorithm until \c dest is reached.
alpar@1128:     ///
alpar@1130:     ///\pre init() must be called and at least one node should be added
alpar@1130:     ///with addSource() before using this function.
alpar@1128:     ///
alpar@1128:     ///This method runs the %Dijkstra algorithm from the root node(s)
alpar@1128:     ///in order to
alpar@1128:     ///compute the
alpar@1128:     ///shortest path to \c dest. The algorithm computes
alpar@1128:     ///- The shortest path to \c  dest.
alpar@1128:     ///- The distance of \c dest from the root(s).
alpar@1128:     ///
alpar@1128:     void start(Node dest)
alpar@1128:     {
deba@1721:       while ( !_heap->empty() && _heap->top()!=dest ) processNextNode();
deba@1721:       if ( !_heap->empty() ) finalizeNodeData(_heap->top(),_heap->prio());
alpar@1130:     }
alpar@1130:     
alpar@1130:     ///Executes the algorithm until a condition is met.
alpar@1130: 
alpar@1130:     ///Executes the algorithm until a condition is met.
alpar@1130:     ///
alpar@1130:     ///\pre init() must be called and at least one node should be added
alpar@1130:     ///with addSource() before using this function.
alpar@1130:     ///
alpar@1130:     ///\param nm must be a bool (or convertible) node map. The algorithm
deba@2443:     ///will stop when it reaches a node \c v with <tt>nm[v]</tt> true.
deba@2439:     ///
kpeter@2476:     ///\return The reached node \c v with <tt>nm[v]</tt> true or
deba@2439:     ///\c INVALID if no such node was found.
deba@1345:     template<class NodeBoolMap>
deba@2439:     Node start(const NodeBoolMap &nm)
alpar@1130:     {
deba@1721:       while ( !_heap->empty() && !nm[_heap->top()] ) processNextNode();
deba@2439:       if ( _heap->empty() ) return INVALID;
deba@2439:       finalizeNodeData(_heap->top(),_heap->prio());
deba@2439:       return _heap->top();
alpar@1128:     }
alpar@1128:     
alpar@1128:     ///Runs %Dijkstra algorithm from node \c s.
alpar@1128:     
alpar@1128:     ///This method runs the %Dijkstra algorithm from a root node \c s
alpar@1128:     ///in order to
alpar@1128:     ///compute the
alpar@1128:     ///shortest path to each node. The algorithm computes
alpar@1128:     ///- The shortest path tree.
alpar@1128:     ///- The distance of each node from the root.
alpar@1128:     ///
alpar@1128:     ///\note d.run(s) is just a shortcut of the following code.
alpar@1128:     ///\code
alpar@1128:     ///  d.init();
alpar@1128:     ///  d.addSource(s);
alpar@1128:     ///  d.start();
alpar@1128:     ///\endcode
alpar@1128:     void run(Node s) {
alpar@1128:       init();
alpar@1128:       addSource(s);
alpar@1128:       start();
alpar@1128:     }
alpar@1128:     
alpar@1130:     ///Finds the shortest path between \c s and \c t.
alpar@1130:     
alpar@1130:     ///Finds the shortest path between \c s and \c t.
alpar@1130:     ///
alpar@1130:     ///\return The length of the shortest s---t path if there exists one,
alpar@1130:     ///0 otherwise.
alpar@1130:     ///\note Apart from the return value, d.run(s) is
alpar@1130:     ///just a shortcut of the following code.
alpar@1130:     ///\code
alpar@1130:     ///  d.init();
alpar@1130:     ///  d.addSource(s);
alpar@1130:     ///  d.start(t);
alpar@1130:     ///\endcode
alpar@1130:     Value run(Node s,Node t) {
alpar@1130:       init();
alpar@1130:       addSource(s);
alpar@1130:       start(t);
deba@2537:       return (*_pred)[t]==INVALID?OperationTraits::zero():(*_dist)[t];
alpar@1130:     }
alpar@1130:     
alpar@1128:     ///@}
alpar@1128: 
alpar@1128:     ///\name Query Functions
alpar@1128:     ///The result of the %Dijkstra algorithm can be obtained using these
alpar@1128:     ///functions.\n
alpar@1128:     ///Before the use of these functions,
alpar@1128:     ///either run() or start() must be called.
alpar@1128:     
alpar@1128:     ///@{
alpar@1128: 
deba@2335:     ///Gives back the shortest path.
alpar@1283:     
deba@2335:     ///Gives back the shortest path.
deba@2335:     ///\pre The \c t should be reachable from the source.
deba@2335:     Path path(Node t) 
alpar@1283:     {
deba@2335:       return Path(*G, *_pred, t);
alpar@1283:     }
deba@2335: 
jacint@385:     ///The distance of a node from the root.
alpar@255: 
jacint@385:     ///Returns the distance of a node from the root.
alpar@255:     ///\pre \ref run() must be called before using this function.
jacint@385:     ///\warning If node \c v in unreachable from the root the return value
alpar@255:     ///of this funcion is undefined.
alpar@1130:     Value dist(Node v) const { return (*_dist)[v]; }
jacint@373: 
deba@2358:     ///The current distance of a node from the root.
deba@2358: 
deba@2358:     ///Returns the current distance of a node from the root.
deba@2358:     ///It may be decreased in the following processes.
deba@2358:     ///\pre \c node should be reached but not processed
deba@2358:     Value currentDist(Node v) const { return (*_heap)[v]; }
deba@2358: 
alpar@584:     ///Returns the 'previous edge' of the shortest path tree.
alpar@255: 
alpar@584:     ///For a node \c v it returns the 'previous edge' of the shortest path tree,
alpar@785:     ///i.e. it returns the last edge of a shortest path from the root to \c
alpar@688:     ///v. It is \ref INVALID
alpar@688:     ///if \c v is unreachable from the root or if \c v=s. The
jacint@385:     ///shortest path tree used here is equal to the shortest path tree used in
alpar@1631:     ///\ref predNode().  \pre \ref run() must be called before using
jacint@385:     ///this function.
deba@1763:     Edge predEdge(Node v) const { return (*_pred)[v]; }
jacint@373: 
alpar@584:     ///Returns the 'previous node' of the shortest path tree.
alpar@255: 
alpar@584:     ///For a node \c v it returns the 'previous node' of the shortest path tree,
jacint@385:     ///i.e. it returns the last but one node from a shortest path from the
jacint@385:     ///root to \c /v. It is INVALID if \c v is unreachable from the root or if
jacint@385:     ///\c v=s. The shortest path tree used here is equal to the shortest path
deba@1763:     ///tree used in \ref predEdge().  \pre \ref run() must be called before
jacint@385:     ///using this function.
alpar@1130:     Node predNode(Node v) const { return (*_pred)[v]==INVALID ? INVALID:
alpar@1130: 				  G->source((*_pred)[v]); }
alpar@255:     
alpar@255:     ///Returns a reference to the NodeMap of distances.
alpar@255: 
jacint@385:     ///Returns a reference to the NodeMap of distances. \pre \ref run() must
jacint@385:     ///be called before using this function.
alpar@1130:     const DistMap &distMap() const { return *_dist;}
jacint@385:  
alpar@255:     ///Returns a reference to the shortest path tree map.
alpar@255: 
alpar@255:     ///Returns a reference to the NodeMap of the edges of the
alpar@255:     ///shortest path tree.
alpar@255:     ///\pre \ref run() must be called before using this function.
alpar@1119:     const PredMap &predMap() const { return *_pred;}
jacint@385:  
jacint@385:     ///Checks if a node is reachable from the root.
alpar@255: 
jacint@385:     ///Returns \c true if \c v is reachable from the root.
alpar@1218:     ///\warning The source nodes are inditated as unreached.
alpar@255:     ///\pre \ref run() must be called before using this function.
jacint@385:     ///
deba@1721:     bool reached(Node v) { return (*_heap_cross_ref)[v] != Heap::PRE_HEAP; }
alpar@1734: 
alpar@1734:     ///Checks if a node is processed.
alpar@1734: 
alpar@1734:     ///Returns \c true if \c v is processed, i.e. the shortest
alpar@1734:     ///path to \c v has already found.
alpar@1734:     ///\pre \ref run() must be called before using this function.
alpar@1734:     ///
alpar@1734:     bool processed(Node v) { return (*_heap_cross_ref)[v] == Heap::POST_HEAP; }
alpar@255:     
alpar@1128:     ///@}
alpar@255:   };
alpar@953: 
alpar@1218: 
alpar@1218: 
alpar@1218: 
alpar@1218:  
alpar@1218:   ///Default traits class of Dijkstra function.
alpar@1218: 
alpar@1218:   ///Default traits class of Dijkstra function.
alpar@1218:   ///\param GR Graph type.
alpar@1218:   ///\param LM Type of length map.
alpar@1218:   template<class GR, class LM>
alpar@1218:   struct DijkstraWizardDefaultTraits
alpar@1218:   {
alpar@1218:     ///The graph type the algorithm runs on. 
alpar@1218:     typedef GR Graph;
alpar@1218:     ///The type of the map that stores the edge lengths.
alpar@1218: 
alpar@1218:     ///The type of the map that stores the edge lengths.
alpar@2260:     ///It must meet the \ref concepts::ReadMap "ReadMap" concept.
alpar@1218:     typedef LM LengthMap;
alpar@1218:     //The type of the length of the edges.
alpar@1218:     typedef typename LM::Value Value;
deba@2537:     /// Operation traits for Dijkstra algorithm.
deba@2537: 
deba@2537:     /// It defines the used operation by the algorithm.
deba@2537:     /// \see DijkstraDefaultOperationTraits
deba@2537:     typedef DijkstraDefaultOperationTraits<Value> OperationTraits;
alpar@1218:     ///The heap type used by Dijkstra algorithm.
alpar@1218: 
deba@1721:     /// The cross reference type used by heap.
deba@1721: 
deba@1721:     /// The cross reference type used by heap.
deba@1721:     /// Usually it is \c Graph::NodeMap<int>.
deba@1721:     typedef typename Graph::template NodeMap<int> HeapCrossRef;
deba@1721:     ///Instantiates a HeapCrossRef.
deba@1721: 
deba@1721:     ///This function instantiates a \ref HeapCrossRef. 
deba@1721:     /// \param G is the graph, to which we would like to define the 
deba@1721:     /// HeapCrossRef.
deba@1721:     /// \todo The graph alone may be insufficient for the initialization
deba@1721:     static HeapCrossRef *createHeapCrossRef(const GR &G) 
deba@1721:     {
deba@1721:       return new HeapCrossRef(G);
deba@1721:     }
deba@1721:     
deba@1721:     ///The heap type used by Dijkstra algorithm.
deba@1721: 
alpar@1218:     ///The heap type used by Dijkstra algorithm.
alpar@1218:     ///
alpar@1218:     ///\sa BinHeap
alpar@1218:     ///\sa Dijkstra
mqrelly@2263:     typedef BinHeap<typename LM::Value, typename GR::template NodeMap<int>,
alpar@1218: 		    std::less<Value> > Heap;
alpar@1218: 
deba@1721:     static Heap *createHeap(HeapCrossRef& R) 
deba@1721:     {
deba@1721:       return new Heap(R);
deba@1721:     }
deba@1721: 
alpar@1218:     ///\brief The type of the map that stores the last
alpar@1218:     ///edges of the shortest paths.
alpar@1218:     /// 
alpar@1218:     ///The type of the map that stores the last
alpar@1218:     ///edges of the shortest paths.
alpar@2260:     ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
alpar@1218:     ///
alpar@1218:     typedef NullMap <typename GR::Node,typename GR::Edge> PredMap;
alpar@1218:     ///Instantiates a PredMap.
alpar@1218:  
alpar@1218:     ///This function instantiates a \ref PredMap. 
alpar@1536:     ///\param g is the graph, to which we would like to define the PredMap.
alpar@1218:     ///\todo The graph alone may be insufficient for the initialization
alpar@1536: #ifdef DOXYGEN
alpar@1536:     static PredMap *createPredMap(const GR &g) 
alpar@1536: #else
alpar@1367:     static PredMap *createPredMap(const GR &) 
alpar@1536: #endif
alpar@1218:     {
alpar@1218:       return new PredMap();
alpar@1218:     }
alpar@1218:     ///The type of the map that stores whether a nodes is processed.
alpar@1218:  
alpar@1218:     ///The type of the map that stores whether a nodes is processed.
alpar@2260:     ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
alpar@1218:     ///By default it is a NullMap.
alpar@1218:     ///\todo If it is set to a real map,
alpar@1218:     ///Dijkstra::processed() should read this.
alpar@1218:     ///\todo named parameter to set this type, function to read and write.
alpar@1218:     typedef NullMap<typename Graph::Node,bool> ProcessedMap;
alpar@1218:     ///Instantiates a ProcessedMap.
alpar@1218:  
alpar@1218:     ///This function instantiates a \ref ProcessedMap. 
alpar@1536:     ///\param g is the graph, to which
alpar@1218:     ///we would like to define the \ref ProcessedMap
alpar@1536: #ifdef DOXYGEN
alpar@1536:     static ProcessedMap *createProcessedMap(const GR &g)
alpar@1536: #else
alpar@1367:     static ProcessedMap *createProcessedMap(const GR &)
alpar@1536: #endif
alpar@1218:     {
alpar@1218:       return new ProcessedMap();
alpar@1218:     }
alpar@1218:     ///The type of the map that stores the dists of the nodes.
alpar@1218:  
alpar@1218:     ///The type of the map that stores the dists of the nodes.
alpar@2260:     ///It must meet the \ref concepts::WriteMap "WriteMap" concept.
alpar@1218:     ///
alpar@1218:     typedef NullMap<typename Graph::Node,typename LM::Value> DistMap;
alpar@1218:     ///Instantiates a DistMap.
alpar@1218:  
alpar@1218:     ///This function instantiates a \ref DistMap. 
alpar@1536:     ///\param g is the graph, to which we would like to define the \ref DistMap
alpar@1536: #ifdef DOXYGEN
alpar@1536:     static DistMap *createDistMap(const GR &g)
alpar@1536: #else
alpar@1367:     static DistMap *createDistMap(const GR &)
alpar@1536: #endif
alpar@1218:     {
alpar@1218:       return new DistMap();
alpar@1218:     }
alpar@1218:   };
alpar@1218:   
hegyi@1123:   /// Default traits used by \ref DijkstraWizard
hegyi@1123: 
alpar@1151:   /// To make it easier to use Dijkstra algorithm
alpar@1151:   ///we have created a wizard class.
alpar@1151:   /// This \ref DijkstraWizard class needs default traits,
alpar@1151:   ///as well as the \ref Dijkstra class.
hegyi@1123:   /// The \ref DijkstraWizardBase is a class to be the default traits of the
hegyi@1123:   /// \ref DijkstraWizard class.
alpar@1220:   /// \todo More named parameters are required...
alpar@1116:   template<class GR,class LM>
alpar@1218:   class DijkstraWizardBase : public DijkstraWizardDefaultTraits<GR,LM>
alpar@1116:   {
alpar@1116: 
alpar@1218:     typedef DijkstraWizardDefaultTraits<GR,LM> Base;
alpar@1116:   protected:
alpar@1201:     /// Type of the nodes in the graph.
alpar@1201:     typedef typename Base::Graph::Node Node;
alpar@1201: 
alpar@1116:     /// Pointer to the underlying graph.
alpar@1116:     void *_g;
alpar@1116:     /// Pointer to the length map
alpar@1116:     void *_length;
alpar@1116:     ///Pointer to the map of predecessors edges.
alpar@1116:     void *_pred;
alpar@1116:     ///Pointer to the map of distances.
alpar@1116:     void *_dist;
alpar@1116:     ///Pointer to the source node.
alpar@1201:     Node _source;
alpar@1116: 
alpar@1116:     public:
hegyi@1123:     /// Constructor.
hegyi@1123:     
hegyi@1123:     /// This constructor does not require parameters, therefore it initiates
hegyi@1123:     /// all of the attributes to default values (0, INVALID).
alpar@1218:     DijkstraWizardBase() : _g(0), _length(0), _pred(0),
alpar@1218: 			   _dist(0), _source(INVALID) {}
alpar@1116: 
hegyi@1123:     /// Constructor.
hegyi@1123:     
alpar@1156:     /// This constructor requires some parameters,
alpar@1156:     /// listed in the parameters list.
hegyi@1123:     /// Others are initiated to 0.
hegyi@1123:     /// \param g is the initial value of  \ref _g
hegyi@1123:     /// \param l is the initial value of  \ref _length
hegyi@1123:     /// \param s is the initial value of  \ref _source
alpar@1116:     DijkstraWizardBase(const GR &g,const LM &l, Node s=INVALID) :
deba@2386:       _g(reinterpret_cast<void*>(const_cast<GR*>(&g))), 
deba@2386:       _length(reinterpret_cast<void*>(const_cast<LM*>(&l))), 
deba@2386:       _pred(0), _dist(0), _source(s) {}
alpar@1116: 
alpar@1116:   };
alpar@1116:   
alpar@1229:   /// A class to make the usage of Dijkstra algorithm easier
alpar@953: 
hegyi@1123:   /// This class is created to make it easier to use Dijkstra algorithm.
hegyi@1123:   /// It uses the functions and features of the plain \ref Dijkstra,
alpar@1151:   /// but it is much simpler to use it.
alpar@953:   ///
hegyi@1123:   /// Simplicity means that the way to change the types defined
hegyi@1123:   /// in the traits class is based on functions that returns the new class
alpar@1151:   /// and not on templatable built-in classes.
alpar@1151:   /// When using the plain \ref Dijkstra
alpar@1151:   /// the new class with the modified type comes from
alpar@1151:   /// the original class by using the ::
alpar@1151:   /// operator. In the case of \ref DijkstraWizard only
alpar@1151:   /// a function have to be called and it will
hegyi@1123:   /// return the needed class.
hegyi@1123:   ///
hegyi@1123:   /// It does not have own \ref run method. When its \ref run method is called
deba@1721:   /// it initiates a plain \ref Dijkstra class, and calls the \ref 
deba@1721:   /// Dijkstra::run method of it.
alpar@953:   template<class TR>
alpar@1116:   class DijkstraWizard : public TR
alpar@953:   {
alpar@1116:     typedef TR Base;
alpar@953: 
hegyi@1123:     ///The type of the underlying graph.
alpar@953:     typedef typename TR::Graph Graph;
alpar@1119:     //\e
alpar@953:     typedef typename Graph::Node Node;
alpar@1119:     //\e
alpar@953:     typedef typename Graph::NodeIt NodeIt;
alpar@1119:     //\e
alpar@953:     typedef typename Graph::Edge Edge;
alpar@1119:     //\e
alpar@953:     typedef typename Graph::OutEdgeIt OutEdgeIt;
alpar@953:     
hegyi@1123:     ///The type of the map that stores the edge lengths.
alpar@953:     typedef typename TR::LengthMap LengthMap;
hegyi@1123:     ///The type of the length of the edges.
alpar@987:     typedef typename LengthMap::Value Value;
hegyi@1123:     ///\brief The type of the map that stores the last
hegyi@1123:     ///edges of the shortest paths.
alpar@953:     typedef typename TR::PredMap PredMap;
hegyi@1123:     ///The type of the map that stores the dists of the nodes.
alpar@953:     typedef typename TR::DistMap DistMap;
hegyi@1123:     ///The heap type used by the dijkstra algorithm.
alpar@953:     typedef typename TR::Heap Heap;
deba@2269:   public:
hegyi@1123:     /// Constructor.
alpar@1116:     DijkstraWizard() : TR() {}
alpar@953: 
hegyi@1123:     /// Constructor that requires parameters.
hegyi@1124: 
hegyi@1124:     /// Constructor that requires parameters.
hegyi@1123:     /// These parameters will be the default values for the traits class.
alpar@1116:     DijkstraWizard(const Graph &g,const LengthMap &l, Node s=INVALID) :
alpar@1116:       TR(g,l,s) {}
alpar@953: 
hegyi@1123:     ///Copy constructor
alpar@1116:     DijkstraWizard(const TR &b) : TR(b) {}
alpar@953: 
alpar@1116:     ~DijkstraWizard() {}
alpar@1116: 
hegyi@1123:     ///Runs Dijkstra algorithm from a given node.
hegyi@1123:     
hegyi@1123:     ///Runs Dijkstra algorithm from a given node.
hegyi@1123:     ///The node can be given by the \ref source function.
alpar@1116:     void run()
alpar@953:     {
alpar@1201:       if(Base::_source==INVALID) throw UninitializedParameter();
deba@1193:       Dijkstra<Graph,LengthMap,TR> 
deba@2386: 	dij(*reinterpret_cast<const Graph*>(Base::_g),
deba@2386:             *reinterpret_cast<const LengthMap*>(Base::_length));
deba@2386:       if(Base::_pred) dij.predMap(*reinterpret_cast<PredMap*>(Base::_pred));
deba@2386:       if(Base::_dist) dij.distMap(*reinterpret_cast<DistMap*>(Base::_dist));
deba@1345:       dij.run(Base::_source);
alpar@1116:     }
alpar@1116: 
hegyi@1124:     ///Runs Dijkstra algorithm from the given node.
hegyi@1123: 
hegyi@1124:     ///Runs Dijkstra algorithm from the given node.
hegyi@1123:     ///\param s is the given source.
alpar@1116:     void run(Node s)
alpar@1116:     {
alpar@1201:       Base::_source=s;
alpar@1116:       run();
alpar@953:     }
alpar@953: 
alpar@953:     template<class T>
alpar@1116:     struct DefPredMapBase : public Base {
alpar@1116:       typedef T PredMap;
alpar@1367:       static PredMap *createPredMap(const Graph &) { return 0; };
alpar@1236:       DefPredMapBase(const TR &b) : TR(b) {}
alpar@1116:     };
alpar@953:     
alpar@1156:     ///\brief \ref named-templ-param "Named parameter"
alpar@1156:     ///function for setting PredMap type
alpar@1156:     ///
alpar@1156:     /// \ref named-templ-param "Named parameter"
alpar@1156:     ///function for setting PredMap type
hegyi@1124:     ///
alpar@953:     template<class T>
alpar@1116:     DijkstraWizard<DefPredMapBase<T> > predMap(const T &t) 
alpar@953:     {
deba@2386:       Base::_pred=reinterpret_cast<void*>(const_cast<T*>(&t));
alpar@1116:       return DijkstraWizard<DefPredMapBase<T> >(*this);
alpar@953:     }
alpar@953:     
alpar@1116:     template<class T>
alpar@1116:     struct DefDistMapBase : public Base {
alpar@1116:       typedef T DistMap;
alpar@1367:       static DistMap *createDistMap(const Graph &) { return 0; };
alpar@1236:       DefDistMapBase(const TR &b) : TR(b) {}
alpar@1116:     };
alpar@953:     
alpar@1156:     ///\brief \ref named-templ-param "Named parameter"
alpar@1156:     ///function for setting DistMap type
alpar@1156:     ///
alpar@1156:     /// \ref named-templ-param "Named parameter"
alpar@1156:     ///function for setting DistMap type
hegyi@1124:     ///
alpar@953:     template<class T>
alpar@1116:     DijkstraWizard<DefDistMapBase<T> > distMap(const T &t) 
alpar@953:     {
deba@2386:       Base::_dist=reinterpret_cast<void*>(const_cast<T*>(&t));
alpar@1116:       return DijkstraWizard<DefDistMapBase<T> >(*this);
alpar@953:     }
alpar@1117:     
hegyi@1123:     /// Sets the source node, from which the Dijkstra algorithm runs.
hegyi@1123: 
hegyi@1123:     /// Sets the source node, from which the Dijkstra algorithm runs.
hegyi@1123:     /// \param s is the source node.
alpar@1117:     DijkstraWizard<TR> &source(Node s) 
alpar@953:     {
alpar@1201:       Base::_source=s;
alpar@953:       return *this;
alpar@953:     }
alpar@953:     
alpar@953:   };
alpar@255:   
alpar@1218:   ///Function type interface for Dijkstra algorithm.
alpar@953: 
deba@2376:   /// \ingroup shortest_path
alpar@1218:   ///Function type interface for Dijkstra algorithm.
alpar@953:   ///
alpar@1218:   ///This function also has several
alpar@1218:   ///\ref named-templ-func-param "named parameters",
alpar@1218:   ///they are declared as the members of class \ref DijkstraWizard.
alpar@1218:   ///The following
alpar@1218:   ///example shows how to use these parameters.
alpar@1218:   ///\code
alpar@1218:   ///  dijkstra(g,length,source).predMap(preds).run();
alpar@1218:   ///\endcode
alpar@1218:   ///\warning Don't forget to put the \ref DijkstraWizard::run() "run()"
alpar@1218:   ///to the end of the parameter list.
alpar@1218:   ///\sa DijkstraWizard
alpar@1218:   ///\sa Dijkstra
alpar@953:   template<class GR, class LM>
alpar@1116:   DijkstraWizard<DijkstraWizardBase<GR,LM> >
alpar@1116:   dijkstra(const GR &g,const LM &l,typename GR::Node s=INVALID)
alpar@953:   {
alpar@1116:     return DijkstraWizard<DijkstraWizardBase<GR,LM> >(g,l,s);
alpar@953:   }
alpar@953: 
alpar@921: } //END OF NAMESPACE LEMON
alpar@255: 
alpar@255: #endif