lemon-0.x: src/work/marci/graph_wrapper.h@22ce98f7d0f1

     1 // -*- c++ -*-

     2 #ifndef HUGO_GRAPH_WRAPPER_H

     3 #define HUGO_GRAPH_WRAPPER_H

     5 ///\ingroup gwrappers

     6 ///\file

     7 ///\brief Several graph wrappers.

     8 ///

     9 ///This file contains several useful graph wrapper functions.

    10 ///

    11 ///\author Marton Makai

    13 #include <invalid.h>

    14 //#include <iter_map.h>

    16 namespace hugo {

    18   // Graph wrappers

    20   /// \addtogroup gwrappers

    21   /// A main parts of HUGOlib are the different graph structures,

    22   /// generic graph algorithms, graph concepts which couple these, and

    23   /// graph wrappers. While the previous ones are more or less clear, the

    24   /// latter notion needs further explanation.

    25   /// Graph wrappers are graph classes which serve for considering graph

    26   /// structures in different ways. A short example makes the notion much

    27   /// clearer.

    28   /// Suppose that we have an instance \c g of a directed graph

    29   /// type say \c ListGraph and an algorithm

    30   /// \code template<typename Graph> int algorithm(const Graph&); \endcode

    31   /// is needed to run on the reversely oriented graph.

    32   /// It may be expensive (in time or in memory usage) to copy

    33   /// \c g with the reverse orientation.

    34   /// Thus, a wrapper class

    35   /// \code template<typename Graph> class RevGraphWrapper; \endcode is used.

    36   /// The code looks as follows

    37   /// \code

    38   /// ListGraph g;

    39   /// RevGraphWrapper<ListGraph> rgw(g);

    40   /// int result=algorithm(rgw);

    41   /// \endcode

    42   /// After running the algorithm, the original graph \c g

    43   /// remains untouched. Thus the graph wrapper used above is to consider the

    44   /// original graph with reverse orientation.

    45   /// This techniques gives rise to an elegant code, and

    46   /// based on stable graph wrappers, complex algorithms can be

    47   /// implemented easily.

    48   /// In flow, circulation and bipartite matching problems, the residual

    49   /// graph is of particular importance. Combining a wrapper implementing

    50   /// this, shortest path algorithms and minimum mean cycle algorithms,

    51   /// a range of weighted and cardinality optimization algorithms can be

    52   /// obtained. For lack of space, for other examples,

    53   /// the interested user is referred to the detailed documentation of graph

    54   /// wrappers.

    55   /// The behavior of graph wrappers can be very different. Some of them keep

    56   /// capabilities of the original graph while in other cases this would be

    57   /// meaningless. This means that the concepts that they are a model of depend

    58   /// on the graph wrapper, and the wrapped graph(s).

    59   /// If an edge of \c rgw is deleted, this is carried out by

    60   /// deleting the corresponding edge of \c g. But for a residual

    61   /// graph, this operation has no sense.

    62   /// Let we stand one more example here to simplify your work.

    63   /// wrapper class

    64   /// \code template<typename Graph> class RevGraphWrapper; \endcode

    65   /// has constructor

    66   /// <tt> RevGraphWrapper(Graph& _g)</tt>.

    67   /// This means that in a situation,

    68   /// when a <tt> const ListGraph& </tt> reference to a graph is given,

    69   /// then it have to be instantiated with <tt>Graph=const ListGraph</tt>.

    70   /// \code

    71   /// int algorithm1(const ListGraph& g) {

    72   ///   RevGraphWrapper<const ListGraph> rgw(g);

    73   ///   return algorithm2(rgw);

    74   /// }

    75   /// \endcode

    77   /// \addtogroup gwrappers

    78   /// @{

    80   ///Base type for the Graph Wrappers

    82   ///This is the base type for the Graph Wrappers.

    83   ///\todo Some more docs...

    84   ///

    85   ///\author Marton Makai

    87   template<typename Graph>

    88   class GraphWrapper {

    89   protected:

    90     Graph* graph;

    91     GraphWrapper() : graph(0) { }

    92     void setGraph(Graph& _graph) { graph=&_graph; }

    94   public:

    95     typedef Graph BaseGraph;

    96     typedef Graph ParentGraph;

    98     GraphWrapper(Graph& _graph) : graph(&_graph) { }

    99 //     Graph& getGraph() const { return *graph; }

   101 //    typedef typename Graph::Node Node;

   102     class Node : public Graph::Node {

   103       friend class GraphWrapper<Graph>;

   104     public:

   105       Node() { }

   106       Node(const typename Graph::Node& _n) : Graph::Node(_n) { }

   107       Node(const Invalid& i) : Graph::Node(i) { }

   108     };

   109     class NodeIt {

   110       friend class GraphWrapper<Graph>;

   111       typename Graph::NodeIt n;

   112      public:

   113       NodeIt() { }

   114       NodeIt(const typename Graph::NodeIt& _n) : n(_n) { }

   115       NodeIt(const Invalid& i) : n(i) { }

   116       NodeIt(const GraphWrapper<Graph>& _G) : n(*(_G.graph)) { }

   117       operator Node() const { return Node(typename Graph::Node(n)); }

   118     };

   119 //    typedef typename Graph::Edge Edge;

   120     class Edge : public Graph::Edge {

   121       friend class GraphWrapper<Graph>;

   122     public:

   123       Edge() { }

   124       Edge(const typename Graph::Edge& _e) : Graph::Edge(_e) { }

   125       Edge(const Invalid& i) : Graph::Edge(i) { }

   126     };

   127     class OutEdgeIt {

   128       friend class GraphWrapper<Graph>;

   129       typename Graph::OutEdgeIt e;

   130     public:

   131       OutEdgeIt() { }

   132       OutEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }

   133       OutEdgeIt(const Invalid& i) : e(i) { }

   134       OutEdgeIt(const GraphWrapper<Graph>& _G, const Node& _n) :

   135 	e(*(_G.graph), typename Graph::Node(_n)) { }

   136       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   137     };

   138     class InEdgeIt {

   139       friend class GraphWrapper<Graph>;

   140       typename Graph::InEdgeIt e;

   141     public:

   142       InEdgeIt() { }

   143       InEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }

   144       InEdgeIt(const Invalid& i) : e(i) { }

   145       InEdgeIt(const GraphWrapper<Graph>& _G, const Node& _n) :

   146 	e(*(_G.graph), typename Graph::Node(_n)) { }

   147       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   148     };

   149     //typedef typename Graph::SymEdgeIt SymEdgeIt;

   150     class EdgeIt {

   151       friend class GraphWrapper<Graph>;

   152       typename Graph::EdgeIt e;

   153     public:

   154       EdgeIt() { }

   155       EdgeIt(const typename Graph::EdgeIt& _e) : e(_e) { }

   156       EdgeIt(const Invalid& i) : e(i) { }

   157       EdgeIt(const GraphWrapper<Graph>& _G) : e(*(_G.graph)) { }

   158       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   159     };

   161     NodeIt& first(NodeIt& i) const {

   162       i=NodeIt(*this); return i;

   163     }

   164     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const {

   165       i=OutEdgeIt(*this, p); return i;

   166     }

   167     InEdgeIt& first(InEdgeIt& i, const Node& p) const {

   168       i=InEdgeIt(*this, p); return i;

   169     }

   170     EdgeIt& first(EdgeIt& i) const {

   171       i=EdgeIt(*this); return i;

   172     }

   174     NodeIt& next(NodeIt& i) const { graph->next(i.n); return i; }

   175     OutEdgeIt& next(OutEdgeIt& i) const { graph->next(i.e); return i; }

   176     InEdgeIt& next(InEdgeIt& i) const { graph->next(i.e); return i; }

   177     EdgeIt& next(EdgeIt& i) const { graph->next(i.e); return i; }

   179     Node tail(const Edge& e) const {

   180       return Node(graph->tail(static_cast<typename Graph::Edge>(e))); }

   181     Node head(const Edge& e) const {

   182       return Node(graph->head(static_cast<typename Graph::Edge>(e))); }

   184     bool valid(const Node& n) const {

   185       return graph->valid(static_cast<typename Graph::Node>(n)); }

   186     bool valid(const Edge& e) const {

   187       return graph->valid(static_cast<typename Graph::Edge>(e)); }

   189     int nodeNum() const { return graph->nodeNum(); }

   190     int edgeNum() const { return graph->edgeNum(); }

   192     Node aNode(const OutEdgeIt& e) const { return Node(graph->aNode(e.e)); }

   193     Node aNode(const InEdgeIt& e) const { return Node(graph->aNode(e.e)); }

   194     Node bNode(const OutEdgeIt& e) const { return Node(graph->bNode(e.e)); }

   195     Node bNode(const InEdgeIt& e) const { return Node(graph->bNode(e.e)); }

   197     Node addNode() const { return Node(graph->addNode()); }

   198     Edge addEdge(const Node& tail, const Node& head) const {

   199       return Edge(graph->addEdge(tail, head)); }

   201     void erase(const Node& i) const { graph->erase(i); }

   202     void erase(const Edge& i) const { graph->erase(i); }

   204     void clear() const { graph->clear(); }

   206     template<typename T> class NodeMap : public Graph::template NodeMap<T> {

   207       typedef typename Graph::template NodeMap<T> Parent;

   208     public:

   209       NodeMap(const GraphWrapper<Graph>& _G) :  Parent(*(_G.graph)) { }

   210       NodeMap(const GraphWrapper<Graph>& _G, T a) : Parent(*(_G.graph), a) { }

   211     };

   213     template<typename T> class EdgeMap : public Graph::template EdgeMap<T> {

   214       typedef typename Graph::template EdgeMap<T> Parent;

   215     public:

   216       EdgeMap(const GraphWrapper<Graph>& _G) : Parent(*(_G.graph)) { }

   217       EdgeMap(const GraphWrapper<Graph>& _G, T a) : Parent(*(_G.graph), a) { }

   218     };

   219   };

   221   /// A graph wrapper which reverses the orientation of the edges.

   223   /// A graph wrapper which reverses the orientation of the edges.

   224   ///

   225   ///\author Marton Makai

   226   template<typename Graph>

   227   class RevGraphWrapper : public GraphWrapper<Graph> {

   228   protected:

   229     RevGraphWrapper() : GraphWrapper<Graph>(0) { }

   230   public:

   231     RevGraphWrapper(Graph& _graph) : GraphWrapper<Graph>(_graph) { }

   233     typedef typename GraphWrapper<Graph>::Node Node;

   234     typedef typename GraphWrapper<Graph>::Edge Edge;

   235     //If Graph::OutEdgeIt is not defined

   236     //and we do not want to use RevGraphWrapper::InEdgeIt,

   237     //the typdef techinque does not work.

   238     //Unfortunately all the typedefs are instantiated in templates.

   239     //typedef typename GraphWrapper<Graph>::OutEdgeIt InEdgeIt;

   240     //typedef typename GraphWrapper<Graph>::InEdgeIt OutEdgeIt;

   242     class OutEdgeIt {

   243       friend class GraphWrapper<Graph>;

   244       friend class RevGraphWrapper<Graph>;

   245       typename Graph::InEdgeIt e;

   246     public:

   247       OutEdgeIt() { }

   248       OutEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }

   249       OutEdgeIt(const Invalid& i) : e(i) { }

   250       OutEdgeIt(const RevGraphWrapper<Graph>& _G, const Node& _n) :

   251 	e(*(_G.graph), typename Graph::Node(_n)) { }

   252       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   253     };

   254     class InEdgeIt {

   255       friend class GraphWrapper<Graph>;

   256       friend class RevGraphWrapper<Graph>;

   257       typename Graph::OutEdgeIt e;

   258     public:

   259       InEdgeIt() { }

   260       InEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }

   261       InEdgeIt(const Invalid& i) : e(i) { }

   262       InEdgeIt(const RevGraphWrapper<Graph>& _G, const Node& _n) :

   263 	e(*(_G.graph), typename Graph::Node(_n)) { }

   264       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   265     };

   267     using GraphWrapper<Graph>::first;

   268     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const {

   269       i=OutEdgeIt(*this, p); return i;

   270     }

   271     InEdgeIt& first(InEdgeIt& i, const Node& p) const {

   272       i=InEdgeIt(*this, p); return i;

   273     }

   275     using GraphWrapper<Graph>::next;

   276     OutEdgeIt& next(OutEdgeIt& i) const { this->graph->next(i.e); return i; }

   277     InEdgeIt& next(InEdgeIt& i) const { this->graph->next(i.e); return i; }

   279     Node aNode(const OutEdgeIt& e) const {

   280       return Node(this->graph->aNode(e.e)); }

   281     Node aNode(const InEdgeIt& e) const {

   282       return Node(this->graph->aNode(e.e)); }

   283     Node bNode(const OutEdgeIt& e) const {

   284       return Node(this->graph->bNode(e.e)); }

   285     Node bNode(const InEdgeIt& e) const {

   286       return Node(this->graph->bNode(e.e)); }

   288     Node tail(const Edge& e) const {

   289       return GraphWrapper<Graph>::head(e); }

   290     Node head(const Edge& e) const {

   291       return GraphWrapper<Graph>::tail(e); }

   293   };

   295   /// Wrapper for hiding nodes and edges from a graph.

   297   /// This wrapper shows a graph with filtered node-set and

   298   /// edge-set. The quick brown fox iterator jumps over

   299   /// the lazy dog nodes or edges if the values for them are false

   300   /// in the bool maps.

   301   ///

   302   ///\author Marton Makai

   303   template<typename Graph, typename NodeFilterMap,

   304 	   typename EdgeFilterMap>

   305   class SubGraphWrapper : public GraphWrapper<Graph> {

   306   protected:

   307     NodeFilterMap* node_filter_map;

   308     EdgeFilterMap* edge_filter_map;

   310     SubGraphWrapper() : GraphWrapper<Graph>(0),

   311 			node_filter_map(0), edge_filter_map(0) { }

   312     void setNodeFilterMap(NodeFilterMap& _node_filter_map) {

   313       node_filter_map=&_node_filte_map;

   314     }

   315     void setEdgeFilterMap(EdgeFilterMap& _edge_filter_map) {

   316       edge_filter_map=&_edge_filte_map;

   317     }

   319   public:

   321     SubGraphWrapper(Graph& _graph, NodeFilterMap& _node_filter_map,

   322 		    EdgeFilterMap& _edge_filter_map) :

   323       GraphWrapper<Graph>(_graph), node_filter_map(&_node_filter_map),

   324       edge_filter_map(&_edge_filter_map) { }

   326     typedef typename GraphWrapper<Graph>::Node Node;

   327     class NodeIt {

   328       friend class GraphWrapper<Graph>;

   329       friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;

   330       typename Graph::NodeIt n;

   331      public:

   332       NodeIt() { }

   333       NodeIt(const typename Graph::NodeIt& _n) : n(_n) { }

   334       NodeIt(const Invalid& i) : n(i) { }

   335       NodeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) :

   336 	n(*(_G.graph)) {

   337 	while (_G.graph->valid(n) && !(*(_G.node_filter_map))[n])

   338 	  _G.graph->next(n);

   339       }

   340       operator Node() const { return Node(typename Graph::Node(n)); }

   341     };

   342     typedef typename GraphWrapper<Graph>::Edge Edge;

   343     class OutEdgeIt {

   344       friend class GraphWrapper<Graph>;

   345       friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;

   346       typename Graph::OutEdgeIt e;

   347     public:

   348       OutEdgeIt() { }

   349       OutEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }

   350       OutEdgeIt(const Invalid& i) : e(i) { }

   351       OutEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G,

   352 		const Node& _n) :

   353 	e(*(_G.graph), typename Graph::Node(_n)) {

   354       	while (_G.graph->valid(e) && !(*(_G.edge_filter_map))[e])

   355 	  _G.graph->next(e);

   356       }

   357       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   358     };

   359     class InEdgeIt {

   360       friend class GraphWrapper<Graph>;

   361       friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;

   362       typename Graph::InEdgeIt e;

   363     public:

   364       InEdgeIt() { }

   365       InEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }

   366       InEdgeIt(const Invalid& i) : e(i) { }

   367       InEdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G,

   368 	       const Node& _n) :

   369 	e(*(_G.graph), typename Graph::Node(_n)) {

   370       	while (_G.graph->valid(e) && !(*(_G.edge_filter_map))[e])

   371 	  _G.graph->next(e);

   372       }

   373       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   374     };

   375     //typedef typename Graph::SymEdgeIt SymEdgeIt;

   376     class EdgeIt {

   377       friend class GraphWrapper<Graph>;

   378       friend class SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>;

   379       typename Graph::EdgeIt e;

   380     public:

   381       EdgeIt() { }

   382       EdgeIt(const typename Graph::EdgeIt& _e) : e(_e) { }

   383       EdgeIt(const Invalid& i) : e(i) { }

   384       EdgeIt(const SubGraphWrapper<Graph, NodeFilterMap, EdgeFilterMap>& _G) :

   385 	e(*(_G.graph)) {

   386       	while (_G.graph->valid(e) && !(*(_G.edge_filter_map))[e])

   387 	  _G.graph->next(e);

   388       }

   389       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   390     };

   392     NodeIt& first(NodeIt& i) const {

   393       i=NodeIt(*this); return i;

   394     }

   395     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const {

   396       i=OutEdgeIt(*this, p); return i;

   397     }

   398     InEdgeIt& first(InEdgeIt& i, const Node& p) const {

   399       i=InEdgeIt(*this, p); return i;

   400     }

   401     EdgeIt& first(EdgeIt& i) const {

   402       i=EdgeIt(*this); return i;

   403     }

   405     NodeIt& next(NodeIt& i) const {

   406       this->graph->next(i.n);

   407       while (this->graph->valid(i) && !(*node_filter_map)[i.n]) {

   408 	this->graph->next(i.n); }

   409       return i;

   410     }

   411     OutEdgeIt& next(OutEdgeIt& i) const {

   412       this->graph->next(i.e);

   413       while (this->graph->valid(i) && !(*edge_filter_map)[i.e]) {

   414 	this->graph->next(i.e); }

   415       return i;

   416     }

   417     InEdgeIt& next(InEdgeIt& i) const {

   418       this->graph->next(i.e);

   419       while (this->graph->valid(i) && !(*edge_filter_map)[i.e]) {

   420 	this->graph->next(i.e); }

   421       return i;

   422     }

   423     EdgeIt& next(EdgeIt& i) const {

   424       this->graph->next(i.e);

   425       while (this->graph->valid(i) && !(*edge_filter_map)[i.e]) {

   426 	this->graph->next(i.e); }

   427       return i;

   428     }

   430     Node aNode(const OutEdgeIt& e) const {

   431       return Node(this->graph->aNode(e.e)); }

   432     Node aNode(const InEdgeIt& e) const {

   433       return Node(this->graph->aNode(e.e)); }

   434     Node bNode(const OutEdgeIt& e) const {

   435       return Node(this->graph->bNode(e.e)); }

   436     Node bNode(const InEdgeIt& e) const {

   437       return Node(this->graph->bNode(e.e)); }

   439     ///\todo

   440     ///Some doki, please.

   441     void hide(const Node& n) const { node_filter_map->set(n, false); }

   442     ///\todo

   443     ///Some doki, please.

   444     void hide(const Edge& e) const { edge_filter_map->set(e, false); }

   446     ///\todo

   447     ///Some doki, please.

   448     void unHide(const Node& n) const { node_filter_map->set(n, true); }

   449     ///\todo

   450     ///Some doki, please.

   451     void unHide(const Edge& e) const { edge_filter_map->set(e, true); }

   453     ///\todo

   454     ///Some doki, please.

   455     bool hidden(const Node& n) const { return (*node_filter_map)[n]; }

   456     ///\todo

   457     ///Some doki, please.

   458     bool hidden(const Edge& e) const { return (*edge_filter_map)[e]; }

   459   };

   461   /// A wrapper for forgetting the orientation of a graph.

   463   /// A wrapper for getting an undirected graph by forgetting

   464   /// the orientation of a directed one.

   465   template<typename Graph>

   466   class UndirGraphWrapper : public GraphWrapper<Graph> {

   467   protected:

   468     UndirGraphWrapper() : GraphWrapper<Graph>() { }

   470   public:

   471     typedef typename GraphWrapper<Graph>::Node Node;

   472     typedef typename GraphWrapper<Graph>::NodeIt NodeIt;

   473     typedef typename GraphWrapper<Graph>::Edge Edge;

   474     typedef typename GraphWrapper<Graph>::EdgeIt EdgeIt;

   476     UndirGraphWrapper(Graph& _graph) : GraphWrapper<Graph>(_graph) { }

   478     class OutEdgeIt {

   479       friend class UndirGraphWrapper<Graph>;

   480       bool out_or_in; //true iff out

   481       typename Graph::OutEdgeIt out;

   482       typename Graph::InEdgeIt in;

   483     public:

   484       OutEdgeIt() { }

   485       OutEdgeIt(const Invalid& i) : Edge(i) { }

   486       OutEdgeIt(const UndirGraphWrapper<Graph>& _G, const Node& _n) {

   487 	out_or_in=true; _G.graph->first(out, _n);

   488 	if (!(_G.graph->valid(out))) { out_or_in=false; _G.graph->first(in, _n);	}

   489       }

   490       operator Edge() const {

   491 	if (out_or_in) return Edge(out); else return Edge(in);

   492       }

   493     };

   495 //FIXME InEdgeIt

   496     typedef OutEdgeIt InEdgeIt;

   498     using GraphWrapper<Graph>::first;

   499 //     NodeIt& first(NodeIt& i) const {

   500 //       i=NodeIt(*this); return i;

   501 //     }

   502     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const {

   503       i=OutEdgeIt(*this, p); return i;

   504     }

   505 //FIXME

   506 //     InEdgeIt& first(InEdgeIt& i, const Node& p) const {

   507 //       i=InEdgeIt(*this, p); return i;

   508 //     }

   509 //     EdgeIt& first(EdgeIt& i) const {

   510 //       i=EdgeIt(*this); return i;

   511 //     }

   513     using GraphWrapper<Graph>::next;

   514 //     NodeIt& next(NodeIt& n) const {

   515 //       GraphWrapper<Graph>::next(n);

   516 //       return n;

   517 //     }

   518     OutEdgeIt& next(OutEdgeIt& e) const {

   519       if (e.out_or_in) {

   520 	typename Graph::Node n=this->graph->tail(e.out);

   521 	this->graph->next(e.out);

   522 	if (!this->graph->valid(e.out)) {

   523 	  e.out_or_in=false; this->graph->first(e.in, n); }

   524       } else {

   525 	this->graph->next(e.in);

   526       }

   527       return e;

   528     }

   529     //FIXME InEdgeIt

   530 //     EdgeIt& next(EdgeIt& e) const {

   531 //       GraphWrapper<Graph>::next(n);

   532 // //      graph->next(e.e);

   533 //       return e;

   534 //     }

   536     Node aNode(const OutEdgeIt& e) const {

   537       if (e.out_or_in) return this->graph->tail(e); else

   538 	return this->graph->head(e); }

   539     Node bNode(const OutEdgeIt& e) const {

   540       if (e.out_or_in) return this->graph->head(e); else

   541 	return this->graph->tail(e); }

   542   };

   546   /// An undirected graph template

   547   template<typename Graph>

   548   class UndirGraph : public UndirGraphWrapper<Graph> {

   549     typedef UndirGraphWrapper<Graph> Parent;

   550   protected:

   551     Graph gr;

   552   public:

   553     UndirGraph() : UndirGraphWrapper<Graph>() {

   554       Parent::setGraph(gr);

   555     }

   556   };

   560   /// A wrapper for composing the residual graph for directed flow and circulation problems.

   562   /// A wrapper for composing the residual graph for directed flow and circulation problems.

   563   template<typename Graph, typename Number,

   564 	   typename CapacityMap, typename FlowMap>

   565   class ResGraphWrapper : public GraphWrapper<Graph> {

   566   protected:

   567     const CapacityMap* capacity;

   568     FlowMap* flow;

   570     ResGraphWrapper() : GraphWrapper<Graph>(0),

   571 			capacity(0), flow(0) { }

   572     void setCapacityMap(const CapacityMap& _capacity_map) {

   573       capacity_map=&_capacity_map;

   574     }

   575     void setFlowMap(FlowMap& _flow) {

   576       flow=&_flow;

   577     }

   579   public:

   581     ResGraphWrapper(Graph& _graph, const CapacityMap& _capacity,

   582 		    FlowMap& _flow) :

   583       GraphWrapper<Graph>(_graph), capacity(&_capacity), flow(&_flow) { }

   585     class Edge;

   586     class OutEdgeIt;

   587     friend class Edge;

   588     friend class OutEdgeIt;

   590     typedef typename GraphWrapper<Graph>::Node Node;

   591     typedef typename GraphWrapper<Graph>::NodeIt NodeIt;

   592     class Edge : public Graph::Edge {

   593       friend class ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>;

   594     protected:

   595       bool forward; //true, iff forward

   596 //      typename Graph::Edge e;

   597     public:

   598       Edge() { }

   599       Edge(const typename Graph::Edge& _e, bool _forward) :

   600 	Graph::Edge(_e), forward(_forward) { }

   601       Edge(const Invalid& i) : Graph::Edge(i), forward(false) { }

   602 //the unique invalid iterator

   603       friend bool operator==(const Edge& u, const Edge& v) {

   604 	return (v.forward==u.forward &&

   605 		static_cast<typename Graph::Edge>(u)==

   606 		static_cast<typename Graph::Edge>(v));

   607       }

   608       friend bool operator!=(const Edge& u, const Edge& v) {

   609 	return (v.forward!=u.forward ||

   610 		static_cast<typename Graph::Edge>(u)!=

   611 		static_cast<typename Graph::Edge>(v));

   612       }

   613     };

   615     class OutEdgeIt {

   616       friend class ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>;

   617     protected:

   618       typename Graph::OutEdgeIt out;

   619       typename Graph::InEdgeIt in;

   620       bool forward;

   621     public:

   622       OutEdgeIt() { }

   623       //FIXME

   624 //      OutEdgeIt(const Edge& e) : Edge(e) { }

   625       OutEdgeIt(const Invalid& i) : out(i), in(i), forward(false) { }

   626 //the unique invalid iterator

   627       OutEdgeIt(const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>& resG, Node v) {

   628 	forward=true;

   629 	resG.graph->first(out, v);

   630 	while( resG.graph->valid(out) && !(resG.resCap(*this)>0) ) { resG.graph->next(out); }

   631 	if (!resG.graph->valid(out)) {

   632 	  forward=false;

   633 	  resG.graph->first(in, v);

   634 	  while( resG.graph->valid(in) && !(resG.resCap(*this)>0) ) { resG.graph->next(in); }

   635 	}

   636       }

   637       operator Edge() const {

   638 //	Edge e;

   639 //	e.forward=this->forward;

   640 //	if (this->forward) e=out; else e=in;

   641 //	return e;

   642 	if (this->forward)

   643 	  return Edge(out, this->forward);

   644 	else

   645 	  return Edge(in, this->forward);

   646       }

   647     };

   649     class InEdgeIt {

   650       friend class ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>;

   651     protected:

   652       typename Graph::OutEdgeIt out;

   653       typename Graph::InEdgeIt in;

   654       bool forward;

   655     public:

   656       InEdgeIt() { }

   657       //FIXME

   658 //      OutEdgeIt(const Edge& e) : Edge(e) { }

   659       InEdgeIt(const Invalid& i) : out(i), in(i), forward(false) { }

   660 //the unique invalid iterator

   661       InEdgeIt(const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>& resG, Node v) {

   662 	forward=true;

   663 	resG.graph->first(in, v);

   664 	while( resG.graph->valid(in) && !(resG.resCap(*this)>0) ) { resG.graph->next(in); }

   665 	if (!resG.graph->valid(in)) {

   666 	  forward=false;

   667 	  resG.graph->first(out, v);

   668 	  while( resG.graph->valid(out) && !(resG.resCap(*this)>0) ) { resG.graph->next(out); }

   669 	}

   670       }

   671       operator Edge() const {

   672 //	Edge e;

   673 //	e.forward=this->forward;

   674 //	if (this->forward) e=out; else e=in;

   675 //	return e;

   676 	if (this->forward)

   677 	  return Edge(in, this->forward);

   678 	else

   679 	  return Edge(out, this->forward);

   680       }

   681     };

   683     class EdgeIt {

   684       friend class ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>;

   685     protected:

   686       typename Graph::EdgeIt e;

   687       bool forward;

   688     public:

   689       EdgeIt() { }

   690       EdgeIt(const Invalid& i) : e(i), forward(false) { }

   691       EdgeIt(const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>& resG) {

   692 	forward=true;

   693 	resG.graph->first(e);

   694 	while (resG.graph->valid(e) && !(resG.resCap(*this)>0)) resG.graph->next(e);

   695 	if (!resG.graph->valid(e)) {

   696 	  forward=false;

   697 	  resG.graph->first(e);

   698 	  while (resG.graph->valid(e) && !(resG.resCap(*this)>0)) resG.graph->next(e);

   699 	}

   700       }

   701       operator Edge() const {

   702 	return Edge(e, this->forward);

   703       }

   704     };

   706     using GraphWrapper<Graph>::first;

   707 //     NodeIt& first(NodeIt& i) const {

   708 //       i=NodeIt(*this); return i;

   709 //     }

   710     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const {

   711       i=OutEdgeIt(*this, p); return i;

   712     }

   713 //    FIXME not tested

   714     InEdgeIt& first(InEdgeIt& i, const Node& p) const {

   715       i=InEdgeIt(*this, p); return i;

   716     }

   717     EdgeIt& first(EdgeIt& i) const {

   718       i=EdgeIt(*this); return i;

   719     }

   721     using GraphWrapper<Graph>::next;

   722 //    NodeIt& next(NodeIt& n) const { GraphWrapper<Graph>::next(n); return n; }

   723     OutEdgeIt& next(OutEdgeIt& e) const {

   724       if (e.forward) {

   725 	Node v=this->graph->aNode(e.out);

   726 	this->graph->next(e.out);

   727 	while( this->graph->valid(e.out) && !(resCap(e)>0) ) {

   728 	  this->graph->next(e.out); }

   729 	if (!this->graph->valid(e.out)) {

   730 	  e.forward=false;

   731 	  this->graph->first(e.in, v);

   732 	  while( this->graph->valid(e.in) && !(resCap(e)>0) ) {

   733 	    this->graph->next(e.in); }

   734 	}

   735       } else {

   736 	this->graph->next(e.in);

   737 	while( this->graph->valid(e.in) && !(resCap(e)>0) ) {

   738 	  this->graph->next(e.in); }

   739       }

   740       return e;

   741     }

   742 //     FIXME Not tested

   743     InEdgeIt& next(InEdgeIt& e) const {

   744       if (e.forward) {

   745 	Node v=this->graph->aNode(e.in);

   746 	this->graph->next(e.in);

   747 	while( this->graph->valid(e.in) && !(resCap(e)>0) ) {

   748 	  this->graph->next(e.in); }

   749 	if (!this->graph->valid(e.in)) {

   750 	  e.forward=false;

   751 	  this->graph->first(e.out, v);

   752 	  while( this->graph->valid(e.out) && !(resCap(e)>0) ) {

   753 	    this->graph->next(e.out); }

   754 	}

   755       } else {

   756 	this->graph->next(e.out);

   757 	while( this->graph->valid(e.out) && !(resCap(e)>0) ) {

   758 	  this->graph->next(e.out); }

   759       }

   760       return e;

   761     }

   762     EdgeIt& next(EdgeIt& e) const {

   763       if (e.forward) {

   764 	this->graph->next(e.e);

   765 	while( this->graph->valid(e.e) && !(resCap(e)>0) ) {

   766 	  this->graph->next(e.e); }

   767 	if (!this->graph->valid(e.e)) {

   768 	  e.forward=false;

   769 	  this->graph->first(e.e);

   770 	  while( this->graph->valid(e.e) && !(resCap(e)>0) ) {

   771 	    this->graph->next(e.e); }

   772 	}

   773       } else {

   774 	this->graph->next(e.e);

   775 	while( this->graph->valid(e.e) && !(resCap(e)>0) ) {

   776 	  this->graph->next(e.e); }

   777       }

   778       return e;

   779     }

   781     Node tail(Edge e) const {

   782       return ((e.forward) ? this->graph->tail(e) : this->graph->head(e)); }

   783     Node head(Edge e) const {

   784       return ((e.forward) ? this->graph->head(e) : this->graph->tail(e)); }

   786     Node aNode(OutEdgeIt e) const {

   787       return ((e.forward) ? this->graph->aNode(e.out) :

   788 	      this->graph->aNode(e.in)); }

   789     Node bNode(OutEdgeIt e) const {

   790       return ((e.forward) ? this->graph->bNode(e.out) :

   791 	      this->graph->bNode(e.in)); }

   793     Node aNode(InEdgeIt e) const {

   794       return ((e.forward) ? this->graph->aNode(e.in) :

   795 	      this->graph->aNode(e.out)); }

   796     Node bNode(InEdgeIt e) const {

   797       return ((e.forward) ? this->graph->bNode(e.in) :

   798 	      this->graph->bNode(e.out)); }

   800 //    int nodeNum() const { return graph->nodeNum(); }

   801     //FIXME

   802     void edgeNum() const { }

   803     //int edgeNum() const { return graph->edgeNum(); }

   806 //    int id(Node v) const { return graph->id(v); }

   808     bool valid(Node n) const { return GraphWrapper<Graph>::valid(n); }

   809     bool valid(Edge e) const {

   810       return this->graph->valid(e);

   811 	//return e.forward ? graph->valid(e.out) : graph->valid(e.in);

   812     }

   814     bool forward(const Edge& e) const { return e.forward; }

   815     bool backward(const Edge& e) const { return !e.forward; }

   817     void augment(const Edge& e, Number a) const {

   818       if (e.forward)

   819 // 	flow->set(e.out, flow->get(e.out)+a);

   820 	flow->set(e, (*flow)[e]+a);

   821       else

   822 // 	flow->set(e.in, flow->get(e.in)-a);

   823 	flow->set(e, (*flow)[e]-a);

   824     }

   826     Number resCap(const Edge& e) const {

   827       if (e.forward)

   828 //	return (capacity->get(e.out)-flow->get(e.out));

   829 	return ((*capacity)[e]-(*flow)[e]);

   830       else

   831 //	return (flow->get(e.in));

   832 	return ((*flow)[e]);

   833     }

   835 //     Number resCap(typename Graph::OutEdgeIt out) const {

   836 // //      return (capacity->get(out)-flow->get(out));

   837 //       return ((*capacity)[out]-(*flow)[out]);

   838 //     }

   840 //     Number resCap(typename Graph::InEdgeIt in) const {

   841 // //      return (flow->get(in));

   842 //       return ((*flow)[in]);

   843 //     }

   845     template <typename T>

   846     class EdgeMap {

   847       typename Graph::template EdgeMap<T> forward_map, backward_map;

   848     public:

   849       EdgeMap(const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>& _G) : forward_map(*(_G.graph)), backward_map(*(_G.graph)) { }

   850       EdgeMap(const ResGraphWrapper<Graph, Number, CapacityMap, FlowMap>& _G, T a) : forward_map(*(_G.graph), a), backward_map(*(_G.graph), a) { }

   851       void set(Edge e, T a) {

   852 	if (e.forward)

   853 	  forward_map.set(e.out, a);

   854 	else

   855 	  backward_map.set(e.in, a);

   856       }

   857       T operator[](Edge e) const {

   858 	if (e.forward)

   859 	  return forward_map[e.out];

   860 	else

   861 	  return backward_map[e.in];

   862       }

   863 //       T get(Edge e) const {

   864 // 	if (e.out_or_in)

   865 // 	  return forward_map.get(e.out);

   866 // 	else

   867 // 	  return backward_map.get(e.in);

   868 //       }

   869     };

   870   };

   872   /// ErasingFirstGraphWrapper for blocking flows.

   874   /// ErasingFirstGraphWrapper for blocking flows.

   875   ///

   876   ///\author Marton Makai

   877   template<typename Graph, typename FirstOutEdgesMap>

   878   class ErasingFirstGraphWrapper : public GraphWrapper<Graph> {

   879   protected:

   880     FirstOutEdgesMap* first_out_edges;

   881   public:

   882     ErasingFirstGraphWrapper(Graph& _graph,

   883 			     FirstOutEdgesMap& _first_out_edges) :

   884       GraphWrapper<Graph>(_graph), first_out_edges(&_first_out_edges) { }

   886     typedef typename GraphWrapper<Graph>::Node Node;

   887 //     class NodeIt {

   888 //       friend class GraphWrapper<Graph>;

   889 //       friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;

   890 //       typename Graph::NodeIt n;

   891 //      public:

   892 //       NodeIt() { }

   893 //       NodeIt(const typename Graph::NodeIt& _n) : n(_n) { }

   894 //       NodeIt(const Invalid& i) : n(i) { }

   895 //       NodeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G) :

   896 // 	n(*(_G.graph)) { }

   897 //       operator Node() const { return Node(typename Graph::Node(n)); }

   898 //     };

   899     typedef typename GraphWrapper<Graph>::Edge Edge;

   900     class OutEdgeIt {

   901       friend class GraphWrapper<Graph>;

   902       friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;

   903 //      typedef typename Graph::OutEdgeIt GraphOutEdgeIt;

   904       typename Graph::OutEdgeIt e;

   905     public:

   906       OutEdgeIt() { }

   907       OutEdgeIt(const typename Graph::OutEdgeIt& _e) : e(_e) { }

   908       OutEdgeIt(const Invalid& i) : e(i) { }

   909       OutEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G,

   910 		const Node& _n) :

   911 	e((*_G.first_out_edges)[_n]) { }

   912       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   913     };

   914     class InEdgeIt {

   915       friend class GraphWrapper<Graph>;

   916       friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;

   917 //      typedef typename Graph::InEdgeIt GraphInEdgeIt;

   918       typename Graph::InEdgeIt e;

   919     public:

   920       InEdgeIt() { }

   921       InEdgeIt(const typename Graph::InEdgeIt& _e) : e(_e) { }

   922       InEdgeIt(const Invalid& i) : e(i) { }

   923       InEdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G,

   924 	       const Node& _n) :

   925 	e(*(_G.graph), typename Graph::Node(_n)) { }

   926       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   927     };

   928     //typedef typename Graph::SymEdgeIt SymEdgeIt;

   929     class EdgeIt {

   930       friend class GraphWrapper<Graph>;

   931       friend class ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>;

   932 //      typedef typename Graph::EdgeIt GraphEdgeIt;

   933       typename Graph::EdgeIt e;

   934     public:

   935       EdgeIt() { }

   936       EdgeIt(const typename Graph::EdgeIt& _e) : e(_e) { }

   937       EdgeIt(const Invalid& i) : e(i) { }

   938       EdgeIt(const ErasingFirstGraphWrapper<Graph, FirstOutEdgesMap>& _G) :

   939 	e(*(_G.graph)) { }

   940       operator Edge() const { return Edge(typename Graph::Edge(e)); }

   941     };

   943     using GraphWrapper<Graph>::first;

   944 //     NodeIt& first(NodeIt& i) const {

   945 //       i=NodeIt(*this); return i;

   946 //     }

   947     OutEdgeIt& first(OutEdgeIt& i, const Node& p) const {

   948       i=OutEdgeIt(*this, p); return i;

   949     }

   950     InEdgeIt& first(InEdgeIt& i, const Node& p) const {

   951       i=InEdgeIt(*this, p); return i;

   952     }

   953     EdgeIt& first(EdgeIt& i) const {

   954       i=EdgeIt(*this); return i;

   955     }

   957     using GraphWrapper<Graph>::next;

   958 //    NodeIt& next(NodeIt& i) const { graph->next(i.n); return i; }

   959     OutEdgeIt& next(OutEdgeIt& i) const { this->graph->next(i.e); return i; }

   960     InEdgeIt& next(InEdgeIt& i) const { this->graph->next(i.e); return i; }

   961     EdgeIt& next(EdgeIt& i) const { this->graph->next(i.e); return i; }

   963     Node aNode(const OutEdgeIt& e) const {

   964       return Node(this->graph->aNode(e.e)); }

   965     Node aNode(const InEdgeIt& e) const {

   966       return Node(this->graph->aNode(e.e)); }

   967     Node bNode(const OutEdgeIt& e) const {

   968       return Node(this->graph->bNode(e.e)); }

   969     Node bNode(const InEdgeIt& e) const {

   970       return Node(this->graph->bNode(e.e)); }

   972     void erase(const OutEdgeIt& e) const {

   973       OutEdgeIt f=e;

   974       this->next(f);

   975       first_out_edges->set(this->tail(e), f.e);

   976     }

   977   };

   979   ///@}

   981 } //namespace hugo

   984 #endif //HUGO_GRAPH_WRAPPER_H

author	jacint
	Wed, 05 May 2004 17:23:04 +0000
changeset 534	22ce98f7d0f1
parent 525	ddc405f1d48f
child 551	d167149bde95
permissions	-rw-r--r--