lemon-0.x: src/work/alpar/list_graph.h@f90f65ba21d5

     1 // -*- mode:C++ -*-

     3 #ifndef HUGO_SMART_GRAPH_H

     4 #define HUGO_SMART_GRAPH_H

     6 ///\file

     7 ///\brief ListGraph and SymListGraph classes.

     9 #include <vector>

    10 #include <limits.h>

    12 #include "invalid.h"

    14 namespace hugo {

    16   class SymListGraph;

    18   ///A list graph class.

    20   ///This is a simple and fast erasable graph implementation.

    21   ///

    22   ///It conforms to the graph interface documented under

    23   ///the description of \ref GraphSkeleton.

    24   ///\sa \ref GraphSkeleton.

    25   class ListGraph {

    27     //Nodes are double linked.

    28     //The free nodes are only single linked using the "next" field.

    29     struct NodeT

    30     {

    31       int first_in,first_out;

    32       int prev, next;

    33       //      NodeT() {}

    34     };

    35     //Edges are double linked.

    36     //The free edges are only single linked using the "next_in" field.

    37     struct EdgeT

    38     {

    39       int head, tail;

    40       int prev_in, prev_out;

    41       int next_in, next_out;

    42       //FIXME: is this necessary?

    43       //      EdgeT() : next_in(-1), next_out(-1) prev_in(-1), prev_out(-1) {}

    44     };

    46     std::vector<NodeT> nodes;

    47     //The first node

    48     int first_node;

    49     //The first free node

    50     int first_free_node;

    51     std::vector<EdgeT> edges;

    52     //The first free edge

    53     int first_free_edge;

    55   protected:

    57     template <typename Key> class DynMapBase

    58     {

    59     protected:

    60       const ListGraph* G;

    61     public:

    62       virtual void add(const Key k) = NULL;

    63       virtual void erase(const Key k) = NULL;

    64       DynMapBase(const ListGraph &_G) : G(&_G) {}

    65       virtual ~DynMapBase() {}

    66       friend class ListGraph;

    67     };

    69   public:

    70     template <typename T> class EdgeMap;

    71     template <typename T> class NodeMap;

    73     class Node;

    74     class Edge;

    76     //  protected:

    77     // HELPME:

    78   protected:

    79     ///\bug It must be public because of SymEdgeMap.

    80     ///

    81     mutable std::vector<DynMapBase<Node> * > dyn_node_maps;

    82     ///\bug It must be public because of SymEdgeMap.

    83     ///

    84     mutable std::vector<DynMapBase<Edge> * > dyn_edge_maps;

    86   public:

    88     class NodeIt;

    89     class EdgeIt;

    90     class OutEdgeIt;

    91     class InEdgeIt;

    93     template <typename T> class NodeMap;

    94     template <typename T> class EdgeMap;

    96   public:

    98     ListGraph() : nodes(), first_node(-1),

    99 		  first_free_node(-1), edges(), first_free_edge(-1) {}

   100     ListGraph(const ListGraph &_g) : nodes(_g.nodes), first_node(_g.first_node),

   101 				     first_free_node(_g.first_free_node),

   102 				     edges(_g.edges),

   103 				     first_free_edge(_g.first_free_edge) {}

   105     ~ListGraph()

   106     {

   107       for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

   108 	  i!=dyn_node_maps.end(); ++i) (**i).G=NULL;

   109       for(std::vector<DynMapBase<Edge> * >::iterator i=dyn_edge_maps.begin();

   110 	  i!=dyn_edge_maps.end(); ++i) (**i).G=NULL;

   111     }

   113     int nodeNum() const { return nodes.size(); }  //FIXME: What is this?

   114     int edgeNum() const { return edges.size(); }  //FIXME: What is this?

   116     ///\bug This function does something different than

   117     ///its name would suggests...

   118     int maxNodeId() const { return nodes.size(); }  //FIXME: What is this?

   119     ///\bug This function does something different than

   120     ///its name would suggests...

   121     int maxEdgeId() const { return edges.size(); }  //FIXME: What is this?

   123     Node tail(Edge e) const { return edges[e.n].tail; }

   124     Node head(Edge e) const { return edges[e.n].head; }

   126     Node aNode(OutEdgeIt e) const { return edges[e.n].tail; }

   127     Node aNode(InEdgeIt e) const { return edges[e.n].head; }

   129     Node bNode(OutEdgeIt e) const { return edges[e.n].head; }

   130     Node bNode(InEdgeIt e) const { return edges[e.n].tail; }

   132     NodeIt& first(NodeIt& v) const {

   133       v=NodeIt(*this); return v; }

   134     EdgeIt& first(EdgeIt& e) const {

   135       e=EdgeIt(*this); return e; }

   136     OutEdgeIt& first(OutEdgeIt& e, const Node v) const {

   137       e=OutEdgeIt(*this,v); return e; }

   138     InEdgeIt& first(InEdgeIt& e, const Node v) const {

   139       e=InEdgeIt(*this,v); return e; }

   141 //     template< typename It >

   142 //     It first() const { It e; first(e); return e; }

   144 //     template< typename It >

   145 //     It first(Node v) const { It e; first(e,v); return e; }

   147     bool valid(Edge e) const { return e.n!=-1; }

   148     bool valid(Node n) const { return n.n!=-1; }

   150     void setInvalid(Edge &e) { e.n=-1; }

   151     void setInvalid(Node &n) { n.n=-1; }

   153     template <typename It> It getNext(It it) const

   154     { It tmp(it); return next(tmp); }

   156     NodeIt& next(NodeIt& it) const {

   157       it.n=nodes[it.n].next;

   158       return it;

   159     }

   160     OutEdgeIt& next(OutEdgeIt& it) const

   161     { it.n=edges[it.n].next_out; return it; }

   162     InEdgeIt& next(InEdgeIt& it) const

   163     { it.n=edges[it.n].next_in; return it; }

   164     EdgeIt& next(EdgeIt& it) const {

   165       if(edges[it.n].next_in!=-1) {

   166 	it.n=edges[it.n].next_in;

   167       }

   168       else {

   169 	int n;

   170 	for(n=nodes[edges[it.n].head].next;

   171 	    n!=-1 && nodes[n].first_in == -1;

   172 	    n = nodes[n].next) ;

   173 	it.n = (n==-1)?-1:nodes[n].first_in;

   174       }

   175       return it;

   176     }

   178     int id(Node v) const { return v.n; }

   179     int id(Edge e) const { return e.n; }

   181     /// Adds a new node to the graph.

   183     /// \todo It adds the nodes in a reversed order.

   184     /// (i.e. the lastly added node becomes the first.)

   185     Node addNode() {

   186       int n;

   188       if(first_free_node==-1)

   189 	{

   190 	  n = nodes.size();

   191 	  nodes.push_back(NodeT());

   192 	}

   193       else {

   194 	n = first_free_node;

   195 	first_free_node = nodes[n].next;

   196       }

   198       nodes[n].next = first_node;

   199       if(first_node != -1) nodes[first_node].prev = n;

   200       first_node = n;

   201       nodes[n].prev = -1;

   203       nodes[n].first_in = nodes[n].first_out = -1;

   205       Node nn; nn.n=n;

   207       //Update dynamic maps

   208       for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

   209 	  i!=dyn_node_maps.end(); ++i) (**i).add(nn);

   211       return nn;

   212     }

   214     Edge addEdge(Node u, Node v) {

   215       int n;

   217       if(first_free_edge==-1)

   218 	{

   219 	  n = edges.size();

   220 	  edges.push_back(EdgeT());

   221 	}

   222       else {

   223 	n = first_free_edge;

   224 	first_free_edge = edges[n].next_in;

   225       }

   227       edges[n].tail = u.n; edges[n].head = v.n;

   229       edges[n].next_out = nodes[u.n].first_out;

   230       if(nodes[u.n].first_out != -1) edges[nodes[u.n].first_out].prev_out = n;

   231       edges[n].next_in = nodes[v.n].first_in;

   232       if(nodes[v.n].first_in != -1) edges[nodes[v.n].first_in].prev_in = n;

   233       edges[n].prev_in = edges[n].prev_out = -1;

   235       nodes[u.n].first_out = nodes[v.n].first_in = n;

   237       Edge e; e.n=n;

   239       //Update dynamic maps

   240       for(std::vector<DynMapBase<Edge> * >::iterator i=dyn_edge_maps.begin();

   241 	  i!=dyn_edge_maps.end(); ++i) (**i).add(e);

   243       return e;

   244     }

   246   private:

   247     void eraseEdge(int n) {

   249       if(edges[n].next_in!=-1)

   250 	edges[edges[n].next_in].prev_in = edges[n].prev_in;

   251       if(edges[n].prev_in!=-1)

   252 	edges[edges[n].prev_in].next_in = edges[n].next_in;

   253       else nodes[edges[n].head].first_in = edges[n].next_in;

   255       if(edges[n].next_out!=-1)

   256 	edges[edges[n].next_out].prev_out = edges[n].prev_out;

   257       if(edges[n].prev_out!=-1)

   258 	edges[edges[n].prev_out].next_out = edges[n].next_out;

   259       else nodes[edges[n].tail].first_out = edges[n].next_out;

   261       edges[n].next_in = first_free_edge;

   262       first_free_edge = -1;

   264       //Update dynamic maps

   265       Edge e; e.n=n;

   266       for(std::vector<DynMapBase<Edge> * >::iterator i=dyn_edge_maps.begin();

   267 	  i!=dyn_edge_maps.end(); ++i) (**i).erase(e);

   268     }

   270   public:

   272     void erase(Node nn) {

   273       int n=nn.n;

   275       int m;

   276       while((m=nodes[n].first_in)!=-1) eraseEdge(m);

   277       while((m=nodes[n].first_out)!=-1) eraseEdge(m);

   279       if(nodes[n].next != -1) nodes[nodes[n].next].prev = nodes[n].prev;

   280       if(nodes[n].prev != -1) nodes[nodes[n].prev].next = nodes[n].next;

   281       else first_node = nodes[n].next;

   283       nodes[n].next = first_free_node;

   284       first_free_node = n;

   286       //Update dynamic maps

   287       for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

   288 	  i!=dyn_node_maps.end(); ++i) (**i).erase(nn);

   289     }

   291     void erase(Edge e) { eraseEdge(e.n); }

   293     ///\bug Dynamic maps must be updated!

   294     ///

   295     void clear() {

   296       nodes.clear();edges.clear();

   297       first_node=first_free_node=first_free_edge=-1;

   298     }

   300     class Node {

   301       friend class ListGraph;

   302       template <typename T> friend class NodeMap;

   304       friend class Edge;

   305       friend class OutEdgeIt;

   306       friend class InEdgeIt;

   307       friend class SymEdge;

   309     protected:

   310       int n;

   311       friend int ListGraph::id(Node v) const;

   312       Node(int nn) {n=nn;}

   313     public:

   314       Node() {}

   315       Node (Invalid i) { n=-1; }

   316       bool operator==(const Node i) const {return n==i.n;}

   317       bool operator!=(const Node i) const {return n!=i.n;}

   318       bool operator<(const Node i) const {return n<i.n;}

   319     };

   321     class NodeIt : public Node {

   322       friend class ListGraph;

   323     public:

   324       NodeIt() : Node() { }

   325       NodeIt(Invalid i) : Node(i) { }

   326       NodeIt(const ListGraph& G) : Node(G.first_node) { }

   327     };

   329     class Edge {

   330       friend class ListGraph;

   331       template <typename T> friend class EdgeMap;

   333       //template <typename T> friend class SymListGraph::SymEdgeMap;

   334       //friend Edge SymListGraph::opposite(Edge) const;

   336       friend class Node;

   337       friend class NodeIt;

   338     protected:

   339       int n;

   340       friend int ListGraph::id(Edge e) const;

   342       Edge(int nn) {n=nn;}

   343     public:

   344       Edge() { }

   345       Edge (Invalid) { n=-1; }

   346       bool operator==(const Edge i) const {return n==i.n;}

   347       bool operator!=(const Edge i) const {return n!=i.n;}

   348       bool operator<(const Edge i) const {return n<i.n;}

   349       ///\bug This is a workaround until somebody tells me how to

   350       ///make class \c SymListGraph::SymEdgeMap friend of Edge

   351       int &idref() {return n;}

   352       const int &idref() const {return n;}

   353     };

   355     class EdgeIt : public Edge {

   356       friend class ListGraph;

   357     public:

   358       EdgeIt(const ListGraph& G) : Edge() {

   359       	int m;

   360 	for(m=G.first_node;

   361 	    m!=-1 && G.nodes[m].first_in == -1; m = G.nodes[m].next);

   362 	n = (m==-1)?-1:G.nodes[m].first_in;

   363       }

   364       EdgeIt (Invalid i) : Edge(i) { }

   365       EdgeIt() : Edge() { }

   366       ///\bug This is a workaround until somebody tells me how to

   367       ///make class \c SymListGraph::SymEdgeMap friend of Edge

   368       int &idref() {return n;}

   369     };

   371     class OutEdgeIt : public Edge {

   372       friend class ListGraph;

   373     public:

   374       OutEdgeIt() : Edge() { }

   375       OutEdgeIt (Invalid i) : Edge(i) { }

   377       OutEdgeIt(const ListGraph& G,const Node v)

   378 	: Edge(G.nodes[v.n].first_out) {}

   379     };

   381     class InEdgeIt : public Edge {

   382       friend class ListGraph;

   383     public:

   384       InEdgeIt() : Edge() { }

   385       InEdgeIt (Invalid i) : Edge(i) { }

   386       InEdgeIt(const ListGraph& G,Node v) :Edge(G.nodes[v.n].first_in){}

   387     };

   389     template <typename T> class NodeMap : public DynMapBase<Node>

   390     {

   391       std::vector<T> container;

   393     public:

   394       typedef T ValueType;

   395       typedef Node KeyType;

   397       NodeMap(const ListGraph &_G) :

   398 	DynMapBase<Node>(_G), container(_G.maxNodeId())

   399       {

   400 	G->dyn_node_maps.push_back(this);

   401       }

   402       NodeMap(const ListGraph &_G,const T &t) :

   403 	DynMapBase<Node>(_G), container(_G.maxNodeId(),t)

   404       {

   405 	G->dyn_node_maps.push_back(this);

   406       }

   408       NodeMap(const NodeMap<T> &m) :

   409  	DynMapBase<Node>(*m.G), container(m.container)

   410       {

   411  	G->dyn_node_maps.push_back(this);

   412       }

   414       template<typename TT> friend class NodeMap;

   416       ///\todo It can copy between different types.

   417       ///

   418       template<typename TT> NodeMap(const NodeMap<TT> &m) :

   419 	DynMapBase<Node>(*m.G)

   420       {

   421 	G->dyn_node_maps.push_back(this);

   422 	typename std::vector<TT>::const_iterator i;

   423 	for(typename std::vector<TT>::const_iterator i=m.container.begin();

   424 	    i!=m.container.end();

   425 	    i++)

   426 	  container.push_back(*i);

   427       }

   428       ~NodeMap()

   429       {

   430 	if(G) {

   431 	  std::vector<DynMapBase<Node>* >::iterator i;

   432 	  for(i=G->dyn_node_maps.begin();

   433 	      i!=G->dyn_node_maps.end() && *i!=this; ++i) ;

   434 	  //if(*i==this) G->dyn_node_maps.erase(i); //FIXME: Way too slow...

   435 	  //A better way to do that: (Is this really important?)

   436 	  if(*i==this) {

   437 	    *i=G->dyn_node_maps.back();

   438 	    G->dyn_node_maps.pop_back();

   439 	  }

   440 	}

   441       }

   443       void add(const Node k)

   444       {

   445 	if(k.n>=int(container.size())) container.resize(k.n+1);

   446       }

   448       void erase(const Node) { }

   450       void set(Node n, T a) { container[n.n]=a; }

   451       //'T& operator[](Node n)' would be wrong here

   452       typename std::vector<T>::reference

   453       operator[](Node n) { return container[n.n]; }

   454       //'const T& operator[](Node n)' would be wrong here

   455       typename std::vector<T>::const_reference

   456       operator[](Node n) const { return container[n.n]; }

   458       ///\warning There is no safety check at all!

   459       ///Using operator = between maps attached to different graph may

   460       ///cause serious problem.

   461       ///\todo Is this really so?

   462       ///\todo It can copy between different types.

   463       const NodeMap<T>& operator=(const NodeMap<T> &m)

   464       {

   465 	container = m.container;

   466 	return *this;

   467       }

   468       template<typename TT>

   469       const NodeMap<T>& operator=(const NodeMap<TT> &m)

   470       {

   471 	copy(m.container.begin(), m.container.end(), container.begin());

   472 	return *this;

   473       }

   475       void update() {}    //Useless for Dynamic Maps

   476       void update(T a) {}  //Useless for Dynamic Maps

   477     };

   479     template <typename T> class EdgeMap : public DynMapBase<Edge>

   480     {

   481       std::vector<T> container;

   483     public:

   484       typedef T ValueType;

   485       typedef Edge KeyType;

   487       EdgeMap(const ListGraph &_G) :

   488 	DynMapBase<Edge>(_G), container(_G.maxEdgeId())

   489       {

   490 	//FIXME: What if there are empty Id's?

   491 	//FIXME: Can I use 'this' in a constructor?

   492 	G->dyn_edge_maps.push_back(this);

   493       }

   494       EdgeMap(const ListGraph &_G,const T &t) :

   495 	DynMapBase<Edge>(_G), container(_G.maxEdgeId(),t)

   496       {

   497 	G->dyn_edge_maps.push_back(this);

   498       }

   499       EdgeMap(const EdgeMap<T> &m) :

   500  	DynMapBase<Edge>(*m.G), container(m.container)

   501       {

   502  	G->dyn_node_maps.push_back(this);

   503       }

   505       template<typename TT> friend class EdgeMap;

   507       ///\todo It can copy between different types.

   508       ///

   509       template<typename TT> EdgeMap(const EdgeMap<TT> &m) :

   510 	DynMapBase<Edge>(*m.G)

   511       {

   512 	G->dyn_node_maps.push_back(this);

   513 	typename std::vector<TT>::const_iterator i;

   514 	for(typename std::vector<TT>::const_iterator i=m.container.begin();

   515 	    i!=m.container.end();

   516 	    i++)

   517 	  container.push_back(*i);

   518       }

   519       ~EdgeMap()

   520       {

   521 	if(G) {

   522 	  std::vector<DynMapBase<Edge>* >::iterator i;

   523 	  for(i=G->dyn_edge_maps.begin();

   524 	      i!=G->dyn_edge_maps.end() && *i!=this; ++i) ;

   525 	  //if(*i==this) G->dyn_edge_maps.erase(i); //Way too slow...

   526 	  //A better way to do that: (Is this really important?)

   527 	  if(*i==this) {

   528 	    *i=G->dyn_edge_maps.back();

   529 	    G->dyn_edge_maps.pop_back();

   530 	  }

   531 	}

   532       }

   534       void add(const Edge k)

   535       {

   536 	if(k.n>=int(container.size())) container.resize(k.n+1);

   537       }

   538       void erase(const Edge) { }

   540       void set(Edge n, T a) { container[n.n]=a; }

   541       //T get(Edge n) const { return container[n.n]; }

   542       typename std::vector<T>::reference

   543       operator[](Edge n) { return container[n.n]; }

   544       typename std::vector<T>::const_reference

   545       operator[](Edge n) const { return container[n.n]; }

   547       ///\warning There is no safety check at all!

   548       ///Using operator = between maps attached to different graph may

   549       ///cause serious problem.

   550       ///\todo Is this really so?

   551       ///\todo It can copy between different types.

   552       const EdgeMap<T>& operator=(const EdgeMap<T> &m)

   553       {

   554 	container = m.container;

   555 	return *this;

   556       }

   557       template<typename TT>

   558       const EdgeMap<T>& operator=(const EdgeMap<TT> &m)

   559       {

   560 	copy(m.container.begin(), m.container.end(), container.begin());

   561 	return *this;

   562       }

   564       void update() {}    //Useless for DynMaps

   565       void update(T a) {}  //Useless for DynMaps

   566     };

   568   };

   570   ///Graph for bidirectional edges.

   572   ///The purpose of this graph structure is to handle graphs

   573   ///having bidirectional edges. Here the function \c addEdge(u,v) adds a pair

   574   ///of oppositely directed edges.

   575   ///There is a new edge map type called

   576   ///\ref SymListGraph::SymEdgeMap "SymEdgeMap"

   577   ///that complements this

   578   ///feature by

   579   ///storing shared values for the edge pairs. The usual

   580   ///\ref GraphSkeleton::EdgeMap "EdgeMap"

   581   ///can be used

   582   ///as well.

   583   ///

   584   ///The oppositely directed edge can also be obtained easily

   585   ///using \ref opposite.

   586   ///

   587   ///Here erase(Edge) deletes a pair of edges.

   588   ///

   589   ///\todo this date structure need some reconsiderations. Maybe it

   590   ///should be implemented independently from ListGraph.

   592   class SymListGraph : public ListGraph

   593   {

   594   public:

   595     template<typename T> class SymEdgeMap;

   596     template<typename T> friend class SymEdgeMap;

   598     SymListGraph() : ListGraph() { }

   599     SymListGraph(const ListGraph &_g) : ListGraph(_g) { }

   600     ///Adds a pair of oppositely directed edges to the graph.

   601     Edge addEdge(Node u, Node v)

   602     {

   603       Edge e = ListGraph::addEdge(u,v);

   604       ListGraph::addEdge(v,u);

   605       return e;

   606     }

   608     void erase(Node n) { ListGraph::erase(n); }

   609     ///The oppositely directed edge.

   611     ///Returns the oppositely directed

   612     ///pair of the edge \c e.

   613     Edge opposite(Edge e) const

   614     {

   615       Edge f;

   616       f.idref() = e.idref() - 2*(e.idref()%2) + 1;

   617       return f;

   618     }

   620     ///Removes a pair of oppositely directed edges to the graph.

   621     void erase(Edge e) {

   622       ListGraph::erase(opposite(e));

   623       ListGraph::erase(e);

   624     }

   626     ///Common data storage for the edge pairs.

   628     ///This map makes it possible to store data shared by the oppositely

   629     ///directed pairs of edges.

   630     template <typename T> class SymEdgeMap : public DynMapBase<Edge>

   631     {

   632       std::vector<T> container;

   634     public:

   635       typedef T ValueType;

   636       typedef Edge KeyType;

   638       SymEdgeMap(const SymListGraph &_G) :

   639 	DynMapBase<Edge>(_G), container(_G.maxEdgeId()/2)

   640       {

   641 	static_cast<const SymListGraph*>(G)->dyn_edge_maps.push_back(this);

   642       }

   643       SymEdgeMap(const SymListGraph &_G,const T &t) :

   644 	DynMapBase<Edge>(_G), container(_G.maxEdgeId()/2,t)

   645       {

   646 	G->dyn_edge_maps.push_back(this);

   647       }

   649       SymEdgeMap(const SymEdgeMap<T> &m) :

   650  	DynMapBase<SymEdge>(*m.G), container(m.container)

   651       {

   652  	G->dyn_node_maps.push_back(this);

   653       }

   655       //      template<typename TT> friend class SymEdgeMap;

   657       ///\todo It can copy between different types.

   658       ///

   660       template<typename TT> SymEdgeMap(const SymEdgeMap<TT> &m) :

   661 	DynMapBase<SymEdge>(*m.G)

   662       {

   663 	G->dyn_node_maps.push_back(this);

   664 	typename std::vector<TT>::const_iterator i;

   665 	for(typename std::vector<TT>::const_iterator i=m.container.begin();

   666 	    i!=m.container.end();

   667 	    i++)

   668 	  container.push_back(*i);

   669       }

   671       ~SymEdgeMap()

   672       {

   673 	if(G) {

   674 	  std::vector<DynMapBase<Edge>* >::iterator i;

   675 	  for(i=static_cast<const SymListGraph*>(G)->dyn_edge_maps.begin();

   676 	      i!=static_cast<const SymListGraph*>(G)->dyn_edge_maps.end()

   677 		&& *i!=this; ++i) ;

   678 	  //if(*i==this) G->dyn_edge_maps.erase(i); //Way too slow...

   679 	  //A better way to do that: (Is this really important?)

   680 	  if(*i==this) {

   681 	    *i=static_cast<const SymListGraph*>(G)->dyn_edge_maps.back();

   682 	    static_cast<const SymListGraph*>(G)->dyn_edge_maps.pop_back();

   683 	  }

   684 	}

   685       }

   687       void add(const Edge k)

   688       {

   689 	if(!k.idref()%2&&k.idref()/2>=int(container.size()))

   690 	  container.resize(k.idref()/2+1);

   691       }

   692       void erase(const Edge k) { }

   694       void set(Edge n, T a) { container[n.idref()/2]=a; }

   695       //T get(Edge n) const { return container[n.idref()/2]; }

   696       typename std::vector<T>::reference

   697       operator[](Edge n) { return container[n.idref()/2]; }

   698       typename std::vector<T>::const_reference

   699       operator[](Edge n) const { return container[n.idref()/2]; }

   701       ///\warning There is no safety check at all!

   702       ///Using operator = between maps attached to different graph may

   703       ///cause serious problem.

   704       ///\todo Is this really so?

   705       ///\todo It can copy between different types.

   706       const SymEdgeMap<T>& operator=(const SymEdgeMap<T> &m)

   707       {

   708 	container = m.container;

   709 	return *this;

   710       }

   711       template<typename TT>

   712       const SymEdgeMap<T>& operator=(const SymEdgeMap<TT> &m)

   713       {

   714 	copy(m.container.begin(), m.container.end(), container.begin());

   715 	return *this;

   716       }

   718       void update() {}    //Useless for DynMaps

   719       void update(T a) {}  //Useless for DynMaps

   721     };

   723   };

   726   ///A graph class containing only nodes.

   728   ///This class implements a graph structure without edges.

   729   ///The most useful application of this class is to be the node set of an

   730   ///\ref EdgeSet class.

   731   ///

   732   ///It conforms to the graph interface documented under

   733   ///the description of \ref GraphSkeleton with the exception that you cannot

   734   ///add (or delete) edges. The usual edge iterators are exists, but they are

   735   ///always \ref INVALID.

   736   ///\sa \ref GraphSkeleton

   737   ///\se \ref EdgeSet

   738   class NodeSet {

   740     //Nodes are double linked.

   741     //The free nodes are only single linked using the "next" field.

   742     struct NodeT

   743     {

   744       int first_in,first_out;

   745       int prev, next;

   746       //      NodeT() {}

   747     };

   749     std::vector<NodeT> nodes;

   750     //The first node

   751     int first_node;

   752     //The first free node

   753     int first_free_node;

   755   protected:

   757     template <typename Key> class DynMapBase

   758     {

   759     protected:

   760       const NodeSet* G;

   761     public:

   762       virtual void add(const Key k) = NULL;

   763       virtual void erase(const Key k) = NULL;

   764       DynMapBase(const NodeSet &_G) : G(&_G) {}

   765       virtual ~DynMapBase() {}

   766       friend class NodeSet;

   767     };

   769   public:

   770     template <typename T> class EdgeMap;

   771     template <typename T> class NodeMap;

   773     class Node;

   774     class Edge;

   776     //  protected:

   777     // HELPME:

   778   protected:

   779     ///\bug It must be public because of SymEdgeMap.

   780     ///

   781     mutable std::vector<DynMapBase<Node> * > dyn_node_maps;

   782     //mutable std::vector<DynMapBase<Edge> * > dyn_edge_maps;

   784   public:

   786     class NodeIt;

   787     class EdgeIt;

   788     class OutEdgeIt;

   789     class InEdgeIt;

   791     template <typename T> class NodeMap;

   792     template <typename T> class EdgeMap;

   794   public:

   796     NodeSet() : nodes(), first_node(-1),

   797 		  first_free_node(-1) {}

   798     NodeSet(const NodeSet &_g) : nodes(_g.nodes), first_node(_g.first_node),

   799 				     first_free_node(_g.first_free_node) {}

   801     ~NodeSet()

   802     {

   803       for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

   804 	  i!=dyn_node_maps.end(); ++i) (**i).G=NULL;

   805       //for(std::vector<DynMapBase<Edge> * >::iterator i=dyn_edge_maps.begin();

   806       //	  i!=dyn_edge_maps.end(); ++i) (**i).G=NULL;

   807     }

   809     int nodeNum() const { return nodes.size(); }  //FIXME: What is this?

   810     int edgeNum() const { return 0; }  //FIXME: What is this?

   812     ///\bug This function does something different than

   813     ///its name would suggests...

   814     int maxNodeId() const { return nodes.size(); }  //FIXME: What is this?

   815     ///\bug This function does something different than

   816     ///its name would suggests...

   817     int maxEdgeId() const { return 0; }  //FIXME: What is this?

   819     Node tail(Edge e) const { return INVALID; }

   820     Node head(Edge e) const { return INVALID; }

   822     Node aNode(OutEdgeIt e) const { return INVALID; }

   823     Node aNode(InEdgeIt e) const { return INVALID; }

   825     Node bNode(OutEdgeIt e) const { return INVALID; }

   826     Node bNode(InEdgeIt e) const { return INVALID; }

   828     NodeIt& first(NodeIt& v) const {

   829       v=NodeIt(*this); return v; }

   830     EdgeIt& first(EdgeIt& e) const {

   831       e=EdgeIt(*this); return e; }

   832     OutEdgeIt& first(OutEdgeIt& e, const Node v) const {

   833       e=OutEdgeIt(*this,v); return e; }

   834     InEdgeIt& first(InEdgeIt& e, const Node v) const {

   835       e=InEdgeIt(*this,v); return e; }

   837 //     template< typename It >

   838 //     It first() const { It e; first(e); return e; }

   840 //     template< typename It >

   841 //     It first(Node v) const { It e; first(e,v); return e; }

   843     bool valid(Edge e) const { return false; }

   844     bool valid(Node n) const { return n.n!=-1; }

   846     void setInvalid(Edge &e) { }

   847     void setInvalid(Node &n) { n.n=-1; }

   849     template <typename It> It getNext(It it) const

   850     { It tmp(it); return next(tmp); }

   852     NodeIt& next(NodeIt& it) const {

   853       it.n=nodes[it.n].next;

   854       return it;

   855     }

   856     OutEdgeIt& next(OutEdgeIt& it) const { return it; }

   857     InEdgeIt& next(InEdgeIt& it) const { return it; }

   858     EdgeIt& next(EdgeIt& it) const { return it; }

   860     int id(Node v) const { return v.n; }

   861     int id(Edge e) const { return -1; }

   863     /// Adds a new node to the graph.

   865     /// \todo It adds the nodes in a reversed order.

   866     /// (i.e. the lastly added node becomes the first.)

   867     Node addNode() {

   868       int n;

   870       if(first_free_node==-1)

   871 	{

   872 	  n = nodes.size();

   873 	  nodes.push_back(NodeT());

   874 	}

   875       else {

   876 	n = first_free_node;

   877 	first_free_node = nodes[n].next;

   878       }

   880       nodes[n].next = first_node;

   881       if(first_node != -1) nodes[first_node].prev = n;

   882       first_node = n;

   883       nodes[n].prev = -1;

   885       nodes[n].first_in = nodes[n].first_out = -1;

   887       Node nn; nn.n=n;

   889       //Update dynamic maps

   890       for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

   891 	  i!=dyn_node_maps.end(); ++i) (**i).add(nn);

   893       return nn;

   894     }

   896     void erase(Node nn) {

   897       int n=nn.n;

   899       if(nodes[n].next != -1) nodes[nodes[n].next].prev = nodes[n].prev;

   900       if(nodes[n].prev != -1) nodes[nodes[n].prev].next = nodes[n].next;

   901       else first_node = nodes[n].next;

   903       nodes[n].next = first_free_node;

   904       first_free_node = n;

   906       //Update dynamic maps

   907       for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

   908 	  i!=dyn_node_maps.end(); ++i) (**i).erase(nn);

   909     }

   911     ///\bug Dynamic maps must be updated!

   912     ///

   913     void clear() {

   914       nodes.clear();

   915       first_node = first_free_node = -1;

   916     }

   918     class Node {

   919       friend class NodeSet;

   920       template <typename T> friend class NodeMap;

   922       friend class Edge;

   923       friend class OutEdgeIt;

   924       friend class InEdgeIt;

   926     protected:

   927       int n;

   928       friend int NodeSet::id(Node v) const;

   929       Node(int nn) {n=nn;}

   930     public:

   931       Node() {}

   932       Node (Invalid i) { n=-1; }

   933       bool operator==(const Node i) const {return n==i.n;}

   934       bool operator!=(const Node i) const {return n!=i.n;}

   935       bool operator<(const Node i) const {return n<i.n;}

   936     };

   938     class NodeIt : public Node {

   939       friend class NodeSet;

   940     public:

   941       NodeIt(const NodeSet& G) : Node(G.first_node) { }

   942       NodeIt() : Node() { }

   943     };

   945     class Edge {

   946       //friend class NodeSet;

   947       //template <typename T> friend class EdgeMap;

   949       //template <typename T> friend class SymNodeSet::SymEdgeMap;

   950       //friend Edge SymNodeSet::opposite(Edge) const;

   952       //      friend class Node;

   953       //      friend class NodeIt;

   954     protected:

   955       //friend int NodeSet::id(Edge e) const;

   956       //      Edge(int nn) {}

   957     public:

   958       Edge() { }

   959       Edge (Invalid) { }

   960       bool operator==(const Edge i) const {return true;}

   961       bool operator!=(const Edge i) const {return false;}

   962       bool operator<(const Edge i) const {return false;}

   963       ///\bug This is a workaround until somebody tells me how to

   964       ///make class \c SymNodeSet::SymEdgeMap friend of Edge

   965       //      int idref() {return -1;}

   966       //      int idref() const {return -1;}

   967     };

   969     class EdgeIt : public Edge {

   970       //friend class NodeSet;

   971     public:

   972       EdgeIt(const NodeSet& G) : Edge() { }

   973       EdgeIt (Invalid i) : Edge(i) { }

   974       EdgeIt() : Edge() { }

   975       ///\bug This is a workaround until somebody tells me how to

   976       ///make class \c SymNodeSet::SymEdgeMap friend of Edge

   977       //      int idref() {return -1;}

   978     };

   980     class OutEdgeIt : public Edge {

   981       friend class NodeSet;

   982     public:

   983       OutEdgeIt() : Edge() { }

   984       OutEdgeIt (Invalid i) : Edge(i) { }

   985       OutEdgeIt(const NodeSet& G,const Node v)	: Edge() {}

   986     };

   988     class InEdgeIt : public Edge {

   989       friend class NodeSet;

   990     public:

   991       InEdgeIt() : Edge() { }

   992       InEdgeIt (Invalid i) : Edge(i) { }

   993       InEdgeIt(const NodeSet& G,Node v) :Edge() {}

   994     };

   996     template <typename T> class NodeMap : public DynMapBase<Node>

   997     {

   998       std::vector<T> container;

  1000     public:

  1001       typedef T ValueType;

  1002       typedef Node KeyType;

  1004       NodeMap(const NodeSet &_G) :

  1005 	DynMapBase<Node>(_G), container(_G.maxNodeId())

  1006       {

  1007 	G->dyn_node_maps.push_back(this);

  1008       }

  1009       NodeMap(const NodeSet &_G,const T &t) :

  1010 	DynMapBase<Node>(_G), container(_G.maxNodeId(),t)

  1011       {

  1012 	G->dyn_node_maps.push_back(this);

  1013       }

  1015       NodeMap(const NodeMap<T> &m) :

  1016  	DynMapBase<Node>(*m.G), container(m.container)

  1017       {

  1018  	G->dyn_node_maps.push_back(this);

  1019       }

  1021       template<typename TT> friend class NodeMap;

  1023       ///\todo It can copy between different types.

  1024       ///

  1025       template<typename TT> NodeMap(const NodeMap<TT> &m) :

  1026 	DynMapBase<Node>(*m.G)

  1027       {

  1028 	G->dyn_node_maps.push_back(this);

  1029 	typename std::vector<TT>::const_iterator i;

  1030 	for(typename std::vector<TT>::const_iterator i=m.container.begin();

  1031 	    i!=m.container.end();

  1032 	    i++)

  1033 	  container.push_back(*i);

  1034       }

  1035       ~NodeMap()

  1036       {

  1037 	if(G) {

  1038 	  std::vector<DynMapBase<Node>* >::iterator i;

  1039 	  for(i=G->dyn_node_maps.begin();

  1040 	      i!=G->dyn_node_maps.end() && *i!=this; ++i) ;

  1041 	  //if(*i==this) G->dyn_node_maps.erase(i); //FIXME: Way too slow...

  1042 	  //A better way to do that: (Is this really important?)

  1043 	  if(*i==this) {

  1044 	    *i=G->dyn_node_maps.back();

  1045 	    G->dyn_node_maps.pop_back();

  1046 	  }

  1047 	}

  1048       }

  1050       void add(const Node k)

  1051       {

  1052 	if(k.n>=int(container.size())) container.resize(k.n+1);

  1053       }

  1055       void erase(const Node) { }

  1057       void set(Node n, T a) { container[n.n]=a; }

  1058       //'T& operator[](Node n)' would be wrong here

  1059       typename std::vector<T>::reference

  1060       operator[](Node n) { return container[n.n]; }

  1061       //'const T& operator[](Node n)' would be wrong here

  1062       typename std::vector<T>::const_reference

  1063       operator[](Node n) const { return container[n.n]; }

  1065       ///\warning There is no safety check at all!

  1066       ///Using operator = between maps attached to different graph may

  1067       ///cause serious problem.

  1068       ///\todo Is this really so?

  1069       ///\todo It can copy between different types.

  1070       const NodeMap<T>& operator=(const NodeMap<T> &m)

  1071       {

  1072 	container = m.container;

  1073 	return *this;

  1074       }

  1075       template<typename TT>

  1076       const NodeMap<T>& operator=(const NodeMap<TT> &m)

  1077       {

  1078 	copy(m.container.begin(), m.container.end(), container.begin());

  1079 	return *this;

  1080       }

  1082       void update() {}    //Useless for Dynamic Maps

  1083       void update(T a) {}  //Useless for Dynamic Maps

  1084     };

  1086     template <typename T> class EdgeMap

  1087     {

  1088     public:

  1089       typedef T ValueType;

  1090       typedef Edge KeyType;

  1092       EdgeMap(const NodeSet &) { }

  1093       EdgeMap(const NodeSet &,const T &) { }

  1094       EdgeMap(const EdgeMap<T> &) { }

  1095       //      template<typename TT> friend class EdgeMap;

  1097       ///\todo It can copy between different types.

  1098       ///

  1099       template<typename TT> EdgeMap(const EdgeMap<TT> &) { }

  1100       ~EdgeMap() { }

  1102       void add(const Edge  ) { }

  1103       void erase(const Edge) { }

  1105       void set(Edge, T) { }

  1106       //T get(Edge n) const { return container[n.n]; }

  1107       ValueType &operator[](Edge) { return *((T*)(NULL)); }

  1108       const ValueType &operator[](Edge) const { return *((T*)(NULL)); }

  1110       const EdgeMap<T>& operator=(const EdgeMap<T> &) { return *this; }

  1112       template<typename TT>

  1113       const EdgeMap<T>& operator=(const EdgeMap<TT> &m) { return *this; }

  1115       void update() {}

  1116       void update(T a) {}

  1117     };

  1118   };

  1122   ///Graph structure using a node set of another graph.

  1124   ///This structure can be used to establish another graph over a node set

  1125   /// of an existing one. The node iterator will go through the nodes of the

  1126   /// original graph, and the NodeMap's of both graphs will convert to

  1127   /// each other.

  1128   ///

  1129   ///\param GG The type of the graph which shares its node set with this class.

  1130   ///Its interface must conform with \ref GraphSkeleton.

  1131   ///

  1132   ///It conforms to the graph interface documented under

  1133   ///the description of \ref GraphSkeleton.

  1134   ///\sa \ref GraphSkeleton.

  1135   ///\sa \ref NodeSet.

  1136   template<typename GG>

  1137   class EdgeSet {

  1139     typedef GG NodeGraphType;

  1141     NodeGraphType &G;

  1143     class Node;

  1145     //Edges are double linked.

  1146     //The free edges are only single linked using the "next_in" field.

  1147     struct NodeT

  1148     {

  1149       int first_in,first_out;

  1150       NodeT() : first_in(-1), first_out(-1) { }

  1151     };

  1153     struct EdgeT

  1154     {

  1155       Node head, tail;

  1156       int prev_in, prev_out;

  1157       int next_in, next_out;

  1158     };

  1161     typename NodeGraphType::NodeMap<NodeT> nodes;

  1163     std::vector<EdgeT> edges;

  1164     //The first free edge

  1165     int first_free_edge;

  1167   protected:

  1169     template <typename Key> class DynMapBase

  1170     {

  1171     protected:

  1172       const EdgeSet* G;

  1173     public:

  1174       virtual void add(const Key k) = NULL;

  1175       virtual void erase(const Key k) = NULL;

  1176       DynMapBase(const EdgeSet &_G) : G(&_G) {}

  1177       virtual ~DynMapBase() {}

  1178       friend class EdgeSet;

  1179     };

  1181   public:

  1182     //template <typename T> class NodeMap;

  1183     template <typename T> class EdgeMap;

  1185     class Node;

  1186     class Edge;

  1188     //  protected:

  1189     // HELPME:

  1190   protected:

  1191     // mutable std::vector<DynMapBase<Node> * > dyn_node_maps;

  1192     ///\bug It must be public because of SymEdgeMap.

  1193     ///

  1194     mutable std::vector<DynMapBase<Edge> * > dyn_edge_maps;

  1196   public:

  1198     class NodeIt;

  1199     class EdgeIt;

  1200     class OutEdgeIt;

  1201     class InEdgeIt;

  1203     template <typename T> class NodeMap;

  1204     template <typename T> class EdgeMap;

  1206   public:

  1208     EdgeSet(NodeGraphType &_G) : G(_G),

  1209 				 nodes(_G), edges(),

  1210 				 first_free_edge(-1) { }

  1211     EdgeSet(const EdgeSet &_g) : G(_g.G), nodes(_g.G), edges(_g.edges),

  1212 				 first_free_edge(_g.first_free_edge) { }

  1214     ~EdgeSet()

  1215     {

  1216       // for(std::vector<DynMapBase<Node> * >::iterator i=dyn_node_maps.begin();

  1217       //  i!=dyn_node_maps.end(); ++i) (**i).G=NULL;

  1218       for(typename std::vector<DynMapBase<Edge> * >::iterator

  1219 	    i=dyn_edge_maps.begin();

  1220 	  i!=dyn_edge_maps.end(); ++i) (**i).G=NULL;

  1221     }

  1223     int nodeNum() const { return G.nodeNum(); }  //FIXME: What is this?

  1224     int edgeNum() const { return edges.size(); }  //FIXME: What is this?

  1226     ///\bug This function does something different than

  1227     ///its name would suggests...

  1228     int maxNodeId() const { return G.maxNodeId(); }  //FIXME: What is this?

  1229     ///\bug This function does something different than

  1230     ///its name would suggests...

  1231     int maxEdgeId() const { return edges.size(); }  //FIXME: What is this?

  1233     Node tail(Edge e) const { return edges[e.n].tail; }

  1234     Node head(Edge e) const { return edges[e.n].head; }

  1236     Node aNode(OutEdgeIt e) const { return edges[e.n].tail; }

  1237     Node aNode(InEdgeIt e) const { return edges[e.n].head; }

  1239     Node bNode(OutEdgeIt e) const { return edges[e.n].head; }

  1240     Node bNode(InEdgeIt e) const { return edges[e.n].tail; }

  1242     NodeIt& first(NodeIt& v) const {

  1243       v=NodeIt(*this); return v; }

  1244     EdgeIt& first(EdgeIt& e) const {

  1245       e=EdgeIt(*this); return e; }

  1246     OutEdgeIt& first(OutEdgeIt& e, const Node v) const {

  1247       e=OutEdgeIt(*this,v); return e; }

  1248     InEdgeIt& first(InEdgeIt& e, const Node v) const {

  1249       e=InEdgeIt(*this,v); return e; }

  1251 //     template< typename It >

  1252 //     It first() const { It e; first(e); return e; }

  1254 //     template< typename It >

  1255 //     It first(Node v) const { It e; first(e,v); return e; }

  1257     bool valid(Edge e) const { return e.n!=-1; }

  1258     bool valid(Node n) const { return G.valid(n); }

  1260     void setInvalid(Edge &e) { e.n=-1; }

  1261     void setInvalid(Node &n) { G.setInvalid(n); }

  1263     template <typename It> It getNext(It it) const

  1264     { It tmp(it); return next(tmp); }

  1266     NodeIt& next(NodeIt& it) const { G.next(it); return it; }

  1267     OutEdgeIt& next(OutEdgeIt& it) const

  1268     { it.n=edges[it.n].next_out; return it; }

  1269     InEdgeIt& next(InEdgeIt& it) const

  1270     { it.n=edges[it.n].next_in; return it; }

  1271     EdgeIt& next(EdgeIt& it) const {

  1272       if(edges[it.n].next_in!=-1) {

  1273 	it.n=edges[it.n].next_in;

  1274       }

  1275       else {

  1276 	typename NodeGraphType::Node n;

  1277 	for(n=G.next(edges[it.n].head);

  1278 	    G.valid(n) && nodes[n].first_in == -1;

  1279 	    G.next(n)) ;

  1280 	it.n = (G.valid(n))?-1:nodes[n].first_in;

  1281       }

  1282       return it;

  1283     }

  1285     int id(Node v) const { return G.id(v); }

  1286     int id(Edge e) const { return e.n; }

  1288     /// Adds a new node to the graph.

  1289     Node addNode() { return G.AddNode(); }

  1291     Edge addEdge(Node u, Node v) {

  1292       int n;

  1294       if(first_free_edge==-1)

  1295 	{

  1296 	  n = edges.size();

  1297 	  edges.push_back(EdgeT());

  1298 	}

  1299       else {

  1300 	n = first_free_edge;

  1301 	first_free_edge = edges[n].next_in;

  1302       }

  1304       edges[n].tail = u; edges[n].head = v;

  1306       edges[n].next_out = nodes[u].first_out;

  1307       if(nodes[u].first_out != -1) edges[nodes[u].first_out].prev_out = n;

  1308       edges[n].next_in = nodes[v].first_in;

  1309       if(nodes[v].first_in != -1) edges[nodes[v].first_in].prev_in = n;

  1310       edges[n].prev_in = edges[n].prev_out = -1;

  1312       nodes[u].first_out = nodes[v].first_in = n;

  1314       Edge e; e.n=n;

  1316       //Update dynamic maps

  1317       for(typename std::vector<DynMapBase<Edge> * >::iterator

  1318 	    i=dyn_edge_maps.begin();

  1319 	  i!=dyn_edge_maps.end(); ++i) (**i).add(e);

  1321       return e;

  1322     }

  1324   private:

  1325     void eraseEdge(int n) {

  1327       if(edges[n].next_in!=-1)

  1328 	edges[edges[n].next_in].prev_in = edges[n].prev_in;

  1329       if(edges[n].prev_in!=-1)

  1330 	edges[edges[n].prev_in].next_in = edges[n].next_in;

  1331       else nodes[edges[n].head].first_in = edges[n].next_in;

  1333       if(edges[n].next_out!=-1)

  1334 	edges[edges[n].next_out].prev_out = edges[n].prev_out;

  1335       if(edges[n].prev_out!=-1)

  1336 	edges[edges[n].prev_out].next_out = edges[n].next_out;

  1337       else nodes[edges[n].tail].first_out = edges[n].next_out;

  1339       edges[n].next_in = first_free_edge;

  1340       first_free_edge = -1;

  1342       //Update dynamic maps

  1343       Edge e; e.n=n;

  1344       for(typename std::vector<DynMapBase<Edge> * >::iterator

  1345 	    i=dyn_edge_maps.begin();

  1346 	  i!=dyn_edge_maps.end(); ++i) (**i).erase(e);

  1347     }

  1349   public:

  1351 //     void erase(Node nn) {

  1352 //       int n=nn.n;

  1353 //       int m;

  1354 //       while((m=nodes[n].first_in)!=-1) eraseEdge(m);

  1355 //       while((m=nodes[n].first_out)!=-1) eraseEdge(m);

  1356 //     }

  1358     void erase(Edge e) { eraseEdge(e.n); }

  1360 //     //\bug Dynamic maps must be updated!

  1361 //     //

  1362 //     void clear() {

  1363 //       nodes.clear();edges.clear();

  1364 //       first_node=first_free_node=first_free_edge=-1;

  1365 //     }

  1367     class Node : public NodeGraphType::Node {

  1368       friend class EdgeSet;

  1369       //      template <typename T> friend class NodeMap;

  1371       friend class Edge;

  1372       friend class OutEdgeIt;

  1373       friend class InEdgeIt;

  1374       friend class SymEdge;

  1376     protected:

  1377       friend int EdgeSet::id(Node v) const;

  1378       //      Node(int nn) {n=nn;}

  1379     public:

  1380       Node() : NodeGraphType::Node() {}

  1381       Node (Invalid i) : NodeGraphType::Node(i) {}

  1382       Node(const typename NodeGraphType::Node &n) : NodeGraphType::Node(n) {}

  1383     };

  1385     class NodeIt : public NodeGraphType::NodeIt {

  1386       friend class EdgeSet;

  1387     public:

  1388       NodeIt() : NodeGraphType::NodeIt() { }

  1389       NodeIt (Invalid i) : NodeGraphType::NodeIt(i) {}

  1390       NodeIt(const EdgeSet& _G) : NodeGraphType::NodeIt(_G.G) { }

  1391       NodeIt(const typename NodeGraphType::NodeIt &n)

  1392 	: NodeGraphType::NodeIt(n) {}

  1393       operator Node() { return Node(*this);}

  1394     };

  1396     class Edge {

  1397       friend class EdgeSet;

  1398       template <typename T> friend class EdgeMap;

  1400       //template <typename T> friend class SymEdgeSet::SymEdgeMap;

  1401       //friend Edge SymEdgeSet::opposite(Edge) const;

  1403       friend class Node;

  1404       friend class NodeIt;

  1405     protected:

  1406       int n;

  1407       friend int EdgeSet::id(Edge e) const;

  1409       Edge(int nn) {n=nn;}

  1410     public:

  1411       Edge() { }

  1412       Edge (Invalid) { n=-1; }

  1413       bool operator==(const Edge i) const {return n==i.n;}

  1414       bool operator!=(const Edge i) const {return n!=i.n;}

  1415       bool operator<(const Edge i) const {return n<i.n;}

  1416       ///\bug This is a workaround until somebody tells me how to

  1417       ///make class \c SymEdgeSet::SymEdgeMap friend of Edge

  1418       int &idref() {return n;}

  1419       const int &idref() const {return n;}

  1420     };

  1422     class EdgeIt : public Edge {

  1423       friend class EdgeSet;

  1424     public:

  1425       EdgeIt(const EdgeSet& G) : Edge() {

  1426       	typename NodeGraphType::Node m;

  1427 	for(G.first(m);

  1428 	    G.valid(m) && nodes[m].first_in == -1;  G.next[m]);

  1429 	n = G.valid(m)?-1:nodes[m].first_in;

  1430       }

  1431       EdgeIt (Invalid i) : Edge(i) { }

  1432       EdgeIt() : Edge() { }

  1433       ///\bug This is a workaround until somebody tells me how to

  1434       ///make class \c SymEdgeSet::SymEdgeMap friend of Edge

  1435       int &idref() {return n;}

  1436     };

  1438     class OutEdgeIt : public Edge {

  1439       friend class EdgeSet;

  1440     public:

  1441       OutEdgeIt() : Edge() { }

  1442       OutEdgeIt (Invalid i) : Edge(i) { }

  1444       OutEdgeIt(const EdgeSet& G,const Node v) : Edge(nodes[v].first_out) { }

  1445     };

  1447     class InEdgeIt : public Edge {

  1448       friend class EdgeSet;

  1449     public:

  1450       InEdgeIt() : Edge() { }

  1451       InEdgeIt (Invalid i) : Edge(i) { }

  1452       InEdgeIt(const EdgeSet& G,Node v) :Edge(nodes[v].first_in) { }

  1453     };

  1455     template <typename T> class NodeMap : public NodeGraphType::NodeMap<T>

  1456     {

  1457     public:

  1458       NodeMap(const EdgeSet &_G) :

  1459 	NodeGraphType::NodeMap<T>(_G.G) { }

  1460       NodeMap(const EdgeSet &_G,const T &t) :

  1461 	NodeGraphType::NodeMap<T>(_G.G,t) { }

  1462       //It is unnecessary

  1463       NodeMap(const typename NodeGraphType::NodeMap<T> &m)

  1464 	: NodeGraphType::NodeMap<T>(m) { }

  1466       ///\todo It can copy between different types.

  1467       ///

  1468       template<typename TT>

  1469       NodeMap(const typename NodeGraphType::NodeMap<TT> &m)

  1470 	: NodeGraphType::NodeMap<T>(m) { }

  1471     };

  1473     template <typename T> class EdgeMap : public DynMapBase<Edge>

  1474     {

  1475       std::vector<T> container;

  1477     public:

  1478       typedef T ValueType;

  1479       typedef Edge KeyType;

  1481       EdgeMap(const EdgeSet &_G) :

  1482 	DynMapBase<Edge>(_G), container(_G.maxEdgeId())

  1483       {

  1484 	//FIXME: What if there are empty Id's?

  1485 	//FIXME: Can I use 'this' in a constructor?

  1486 	G->dyn_edge_maps.push_back(this);

  1487       }

  1488       EdgeMap(const EdgeSet &_G,const T &t) :

  1489 	DynMapBase<Edge>(_G), container(_G.maxEdgeId(),t)

  1490       {

  1491 	G->dyn_edge_maps.push_back(this);

  1492       }

  1493       EdgeMap(const EdgeMap<T> &m) :

  1494  	DynMapBase<Edge>(*m.G), container(m.container)

  1495       {

  1496  	G->dyn_node_maps.push_back(this);

  1497       }

  1499       template<typename TT> friend class EdgeMap;

  1501       ///\todo It can copy between different types.

  1502       ///

  1503       template<typename TT> EdgeMap(const EdgeMap<TT> &m) :

  1504 	DynMapBase<Edge>(*m.G)

  1505       {

  1506 	G->dyn_node_maps.push_back(this);

  1507 	typename std::vector<TT>::const_iterator i;

  1508 	for(typename std::vector<TT>::const_iterator i=m.container.begin();

  1509 	    i!=m.container.end();

  1510 	    i++)

  1511 	  container.push_back(*i);

  1512       }

  1513       ~EdgeMap()

  1514       {

  1515 	if(G) {

  1516 	  typename std::vector<DynMapBase<Edge>* >::iterator i;

  1517 	  for(i=G->dyn_edge_maps.begin();

  1518 	      i!=G->dyn_edge_maps.end() && *i!=this; ++i) ;

  1519 	  //if(*i==this) G->dyn_edge_maps.erase(i); //Way too slow...

  1520 	  //A better way to do that: (Is this really important?)

  1521 	  if(*i==this) {

  1522 	    *i=G->dyn_edge_maps.back();

  1523 	    G->dyn_edge_maps.pop_back();

  1524 	  }

  1525 	}

  1526       }

  1528       void add(const Edge k)

  1529       {

  1530 	if(k.n>=int(container.size())) container.resize(k.n+1);

  1531       }

  1532       void erase(const Edge) { }

  1534       void set(Edge n, T a) { container[n.n]=a; }

  1535       //T get(Edge n) const { return container[n.n]; }

  1536       typename std::vector<T>::reference

  1537       operator[](Edge n) { return container[n.n]; }

  1538       typename std::vector<T>::const_reference

  1539       operator[](Edge n) const { return container[n.n]; }

  1541       ///\warning There is no safety check at all!

  1542       ///Using operator = between maps attached to different graph may

  1543       ///cause serious problem.

  1544       ///\todo Is this really so?

  1545       ///\todo It can copy between different types.

  1546       const EdgeMap<T>& operator=(const EdgeMap<T> &m)

  1547       {

  1548 	container = m.container;

  1549 	return *this;

  1550       }

  1551       template<typename TT>

  1552       const EdgeMap<T>& operator=(const EdgeMap<TT> &m)

  1553       {

  1554 	copy(m.container.begin(), m.container.end(), container.begin());

  1555 	return *this;

  1556       }

  1558       void update() {}    //Useless for DynMaps

  1559       void update(T a) {}  //Useless for DynMaps

  1560     };

  1562   };

  1571 } //namespace hugo

  1576 #endif //SMART_GRAPH_H

author	alpar
	Sun, 25 Apr 2004 22:28:19 +0000
changeset 402	f90f65ba21d5
parent 400	cb377609cf1d
child 404	d888ca4e6c00
permissions	-rw-r--r--