lemon-0.x: src/work/list_graph.h@75cf1d52eee5

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

     2 #ifndef HUGO_LIST_GRAPH_H

     3 #define HUGO_LIST_GRAPH_H

     5 #include <iostream>

     6 #include <vector>

     8 #include <hugo/invalid.h>

    10 namespace hugo {

    12   template <typename It>

    13   int count(It it) {

    14     int i=0;

    15     for( ; it.valid(); ++it) { ++i; }

    16     return i;

    17   }

    19   class ListGraph {

    20     struct node_item;

    21     struct edge_item;

    22   public:

    23     class Node;

    24     class NodeIt;

    25     class Edge;

    26     class EdgeIt;

    27     class OutEdgeIt;

    28     class InEdgeIt;

    29     class SymEdgeIt;

    30     template <typename T> class NodeMap;

    31     template <typename T> class EdgeMap;

    32 //  private:

    33     template <typename T> friend class NodeMap;

    34     template <typename T> friend class EdgeMap;

    36     template <typename T>

    37     class NodeMap {

    38       const ListGraph& G;

    39       std::vector<T> container;

    40     public:

    41       typedef T ValueType;

    42       typedef Node KeyType;

    43       NodeMap(const ListGraph& _G) : G(_G), container(G.node_id) { }

    44       NodeMap(const ListGraph& _G, T a) :

    45 	G(_G), container(G.node_id, a) { }

    46       void set(Node n, T a) { container[/*G.id(n)*/n.node->id]=a; }

    47 //      T get(Node n) const { return container[/*G.id(n)*/n.node->id]; }

    48       typename std::vector<T>::reference operator[](Node n) {

    49 	return container[/*G.id(n)*/n.node->id]; }

    50       typename std::vector<T>::const_reference operator[](Node n) const {

    51 	return container[/*G.id(n)*/n.node->id];

    52       }

    53       void update() { container.resize(G.node_id); }

    54       void update(T a) { container.resize(G.node_id, a); }

    55     };

    57     template <typename T>

    58     class EdgeMap {

    59       const ListGraph& G;

    60       std::vector<T> container;

    61     public:

    62       typedef T ValueType;

    63       typedef Edge KeyType;

    64       EdgeMap(const ListGraph& _G) : G(_G), container(G.edge_id) { }

    65       EdgeMap(const ListGraph& _G, T a) :

    66 	G(_G), container(G.edge_id, a) { }

    67       void set(Edge e, T a) { container[/*G.id(e)*/e.edge->id]=a; }

    68 //      T get(Edge e) const { return container[/*G.id(e)*/e.edge->id]; }

    69       typename std::vector<T>::reference operator[](Edge e) {

    70 	return container[/*G.id(e)*/e.edge->id]; }

    71       typename std::vector<T>::const_reference operator[](Edge e) const {

    72 	return container[/*G.id(e)*/e.edge->id];

    73       }

    74       void update() { container.resize(G.edge_id); }

    75       void update(T a) { container.resize(G.edge_id, a); }

    76     };

    78   private:

    79     int node_id;

    80     int edge_id;

    81     int _node_num;

    82     int _edge_num;

    84     node_item* _first_node;

    85     node_item* _last_node;

    87     struct node_item {

    88       int id;

    89       edge_item* _first_out_edge;

    90       edge_item* _last_out_edge;

    91       edge_item* _first_in_edge;

    92       edge_item* _last_in_edge;

    93       node_item* _next_node;

    94       node_item* _prev_node;

    95     };

    97     struct edge_item {

    98       int id;

    99       node_item* _tail;

   100       node_item* _head;

   101       edge_item* _next_out;

   102       edge_item* _prev_out;

   103       edge_item* _next_in;

   104       edge_item* _prev_in;

   105     };

   107     node_item* _add_node() {

   108       node_item* p=new node_item;

   109       p->id=node_id++;

   110       p->_first_out_edge=0;

   111       p->_last_out_edge=0;

   112       p->_first_in_edge=0;

   113       p->_last_in_edge=0;

   114       p->_prev_node=_last_node;

   115       p->_next_node=0;

   116       if (_last_node) _last_node->_next_node=p;

   117       _last_node=p;

   118       if (!_first_node) _first_node=p;

   120       ++_node_num;

   121       return p;

   122     }

   124     edge_item* _add_edge(node_item* _tail, node_item* _head) {

   125       edge_item* e=new edge_item;

   126       e->id=edge_id++;

   127       e->_tail=_tail;

   128       e->_head=_head;

   130       e->_prev_out=_tail->_last_out_edge;

   131       if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e;

   132       _tail->_last_out_edge=e;

   133       if (!_tail->_first_out_edge) _tail->_first_out_edge=e;

   134       e->_next_out=0;

   136       e->_prev_in=_head->_last_in_edge;

   137       if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e;

   138       _head->_last_in_edge=e;

   139       if (!_head->_first_in_edge) { _head->_first_in_edge=e; }

   140       e->_next_in=0;

   142       ++_edge_num;

   143       return e;

   144     }

   146     //deletes a node which has no out edge and no in edge

   147     void _delete_node(node_item* v) {

   148       if (v->_next_node) (v->_next_node)->_prev_node=v->_prev_node; else

   149 	_last_node=v->_prev_node;

   150       if (v->_prev_node) (v->_prev_node)->_next_node=v->_next_node; else

   151 	_first_node=v->_next_node;

   153       delete v;

   154       --_node_num;

   155     }

   157     void _delete_edge(edge_item* e) {

   158       if (e->_next_out) (e->_next_out)->_prev_out=e->_prev_out; else

   159 	(e->_tail)->_last_out_edge=e->_prev_out;

   160       if (e->_prev_out) (e->_prev_out)->_next_out=e->_next_out; else

   161 	(e->_tail)->_first_out_edge=e->_next_out;

   162       if (e->_next_in) (e->_next_in)->_prev_in=e->_prev_in; else

   163 	(e->_head)->_last_in_edge=e->_prev_in;

   164       if (e->_prev_in) (e->_prev_in)->_next_in=e->_next_in; else

   165 	(e->_head)->_first_in_edge=e->_next_in;

   167       delete e;

   168       --_edge_num;

   169     }

   171     void _set_tail(edge_item* e, node_item* _tail) {

   172       if (e->_next_out) (e->_next_out)->_prev_out=e->_prev_out; else

   173 	(e->_tail)->_last_out_edge=e->_prev_out;

   174       if (e->_prev_out) (e->_prev_out)->_next_out=e->_next_out; else

   175 	(e->_tail)->_first_out_edge=e->_next_out;

   177       e->_tail=_tail;

   179       e->_prev_out=_tail->_last_out_edge;

   180       if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e;

   181       _tail->_last_out_edge=e;

   182       if (!_tail->_first_out_edge) _tail->_first_out_edge=e;

   183       e->_next_out=0;

   184     }

   186     void _set_head(edge_item* e, node_item* _head) {

   187       if (e->_next_in) (e->_next_in)->_prev_in=e->_prev_in; else

   188 	(e->_head)->_last_in_edge=e->_prev_in;

   189       if (e->_prev_in) (e->_prev_in)->_next_in=e->_next_in; else

   190 	(e->_head)->_first_in_edge=e->_next_in;

   192       e->_head=_head;

   194       e->_prev_in=_head->_last_in_edge;

   195       if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e;

   196       _head->_last_in_edge=e;

   197       if (!_head->_first_in_edge) { _head->_first_in_edge=e; }

   198       e->_next_in=0;

   199     }

   201   public:

   203     /* default constructor */

   205     ListGraph() : node_id(0), edge_id(0), _node_num(0), _edge_num(0), _first_node(0), _last_node(0) { }

   207     ~ListGraph() {

   208       NodeIt n;

   209       while (this->valid(first(n))) erase(n);

   210       //while (first<NodeIt>().valid()) erase(first<NodeIt>());

   211     }

   213     int nodeNum() const { return _node_num; }

   214     int edgeNum() const { return _edge_num; }

   216     /* functions to construct iterators from the graph, or from each other */

   218     //NodeIt firstNode() const { return NodeIt(*this); }

   219     //EdgeIt firstEdge() const { return EdgeIt(*this); }

   221     //OutEdgeIt firstOutEdge(const Node v) const { return OutEdgeIt(v); }

   222     //InEdgeIt firstInEdge(const Node v) const { return InEdgeIt(v); }

   223     //SymEdgeIt firstSymEdge(const Node v) const { return SymEdgeIt(v); }

   224     Node tail(Edge e) const { return e.tailNode(); }

   225     Node head(Edge e) const { return e.headNode(); }

   227     Node aNode(const OutEdgeIt& e) const { return e.aNode(); }

   228     Node aNode(const InEdgeIt& e) const { return e.aNode(); }

   229     Node aNode(const SymEdgeIt& e) const { return e.aNode(); }

   231     Node bNode(const OutEdgeIt& e) const { return e.bNode(); }

   232     Node bNode(const InEdgeIt& e) const { return e.bNode(); }

   233     Node bNode(const SymEdgeIt& e) const { return e.bNode(); }

   235     //Node invalid_node() { return Node(); }

   236     //Edge invalid_edge() { return Edge(); }

   237     //OutEdgeIt invalid_out_edge() { return OutEdgeIt(); }

   238     //InEdgeIt invalid_in_edge() { return InEdgeIt(); }

   239     //SymEdgeIt invalid_sym_edge() { return SymEdgeIt(); }

   241     /* same methods in other style */

   242     /* for experimental purpose */

   244     NodeIt& first(NodeIt& v) const {

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

   246     EdgeIt& first(EdgeIt& e) const {

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

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

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

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

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

   252     SymEdgeIt& first(SymEdgeIt& e, Node v) const {

   253       e=SymEdgeIt(*this, v); return e; }

   254     //void getTail(Node& n, const Edge& e) const { n=tail(e); }

   255     //void getHead(Node& n, const Edge& e) const { n=head(e); }

   257     //void getANode(Node& n, const OutEdgeIt& e) const { n=e.aNode(); }

   258     //void getANode(Node& n, const InEdgeIt& e) const { n=e.aNode(); }

   259     //void getANode(Node& n, const SymEdgeIt& e) const { n=e.aNode(); }

   260     //void getBNode(Node& n, const OutEdgeIt& e) const { n=e.bNode(); }

   261     //void getBNode(Node& n, const InEdgeIt& e) const { n=e.bNode(); }

   262     //void getBNode(Node& n, const SymEdgeIt& e) const { n=e.bNode(); }

   263     //void get_invalid(Node& n) { n=Node(); }

   264     //void get_invalid(Edge& e) { e=Edge(); }

   265     //void get_invalid(OutEdgeIt& e) { e=OutEdgeIt(); }

   266     //void get_invalid(InEdgeIt& e) { e=InEdgeIt(); }

   267     //void get_invalid(SymEdgeIt& e) { e=SymEdgeIt(); }

   269 //     template< typename It >

   270 //     It first() const {

   271 //       It e;

   272 //       first(e);

   273 //       return e;

   274 //     }

   276 //     template< typename It >

   277 //     It first(Node v) const {

   278 //       It e;

   279 //       first(e, v);

   280 //       return e;

   281 //     }

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

   284     bool valid(Edge e) const { return e.valid(); }

   286 //    template <typename It> It getNext(It it) const {

   287 //      It tmp(it); next(tmp); return tmp; }

   288 //     NodeIt& next(NodeIt& it) const { return ++it; }

   289 //     EdgeIt& next(EdgeIt& it) const { return ++it; }

   290 //     OutEdgeIt& next(OutEdgeIt& it) const { return ++it; }

   291 //     InEdgeIt& next(InEdgeIt& it) const { return ++it; }

   292 //     SymEdgeIt& next(SymEdgeIt& it) const { return ++it; }

   293 //    template <typename It> It& next(It& it) const { return ++it; }

   294     template <typename It> It& next(It& it) const { ++it; return it; }

   297     /* for getting id's of graph objects */

   298     /* these are important for the implementation of property vectors */

   300     int id(Node v) const { return v.node->id; }

   301     int id(Edge e) const { return e.edge->id; }

   303     /* adding nodes and edges */

   305     Node addNode() { return Node(_add_node()); }

   306     Edge addEdge(Node u, Node v) {

   307       return Edge(_add_edge(u.node, v.node));

   308     }

   310     void erase(Node i) {

   311       {

   312 	OutEdgeIt e;

   313 	while (this->valid(first(e, i))) erase(e);

   314       }

   315       {

   316 	InEdgeIt e;

   317 	while (this->valid(first(e, i))) erase(e);

   318       }

   319       //while (first<OutEdgeIt>(i).valid()) erase(first<OutEdgeIt>(i));

   320       //while (first<InEdgeIt>(i).valid()) erase(first<InEdgeIt>(i));

   321       _delete_node(i.node);

   322     }

   324     void erase(Edge e) { _delete_edge(e.edge); }

   326     void clear() {

   327       NodeIt e;

   328       while (this->valid(first(e))) erase(e);

   329       //while (first<NodeIt>().valid()) erase(first<NodeIt>());

   330     }

   332     void setTail(Edge e, Node tail) {

   333       _set_tail(e.edge, tail.node);

   334     }

   336     void setHead(Edge e, Node head) {

   337       _set_head(e.edge, head.node);

   338     }

   340     /* stream operations, for testing purpose */

   342 //     friend std::ostream& operator<<(std::ostream& os, const Node& i) {

   343 //       if (i.valid())

   344 // 	os << i.node->id;

   345 //       else

   346 // 	os << "invalid";

   347 //       return os;

   348 //     }

   349 //     friend std::ostream& operator<<(std::ostream& os, const Edge& i) {

   350 //       if (i.valid())

   351 // 	os << "(" << i.edge->_tail->id << "--" << i.edge->id << "->" << i.edge->_head->id << ")";

   352 //       else

   353 // 	os << "invalid";

   354 //       return os;

   355 //     }

   357     class Node {

   358       friend class ListGraph;

   359       template <typename T> friend class NodeMap;

   361       friend class Edge;

   362       friend class OutEdgeIt;

   363       friend class InEdgeIt;

   364       friend class SymEdgeIt;

   365       //public:  //FIXME: It is required by op= of NodeIt

   366     protected:

   367       node_item* node;

   368     protected:

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

   370     public:

   371       Node() /*: node(0)*/ { }

   372       Node(const Invalid&) : node(0) { }

   373     protected:

   374       Node(node_item* _node) : node(_node) { }

   375       bool valid() const { return (node); }

   376     public:

   377       //void makeInvalid() { node=0; }

   378       friend bool operator==(Node u, Node v) { return v.node==u.node; }

   379       friend bool operator!=(Node u, Node v) { return v.node!=u.node; }

   380       friend std::ostream& operator<<(std::ostream& os, const Node& i);

   381     };

   383     class NodeIt : public Node {

   384       friend class ListGraph;

   385       //protected:

   386     public: //for everybody but marci

   387       NodeIt(const ListGraph& G) : Node(G._first_node) { }

   388     public:

   389       NodeIt() : Node() { }

   390       NodeIt(const Invalid& i) : Node(i) { }

   391     protected:

   392       NodeIt(node_item* v) : Node(v) { }

   393       NodeIt& operator++() { node=node->_next_node; return *this; }

   394       //FIXME::

   395       //      NodeIt& operator=(const Node& e)

   396       //      { node=e.node; return *this; }

   397     };

   399     class Edge {

   400       friend class ListGraph;

   401       template <typename T> friend class EdgeMap;

   403       friend class Node;

   404       friend class NodeIt;

   405     protected:

   406       edge_item* edge;

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

   408     public:

   409       Edge() /*: edge(0)*/ { }

   410       Edge(const Invalid&) : edge(0) { }

   411       //Edge() { }

   412     protected:

   413       Edge(edge_item* _edge) : edge(_edge) { }

   414       bool valid() const { return (edge); }

   415     public:

   416       //void makeInvalid() { edge=0; }

   417       friend bool operator==(Edge u, Edge v) { return v.edge==u.edge; }

   418       friend bool operator!=(Edge u, Edge v) { return v.edge!=u.edge; }

   419     protected:

   420       Node tailNode() const { return Node(edge->_tail); }

   421       Node headNode() const { return Node(edge->_head); }

   422     public:

   423       friend std::ostream& operator<<(std::ostream& os, const Edge& i);

   424     };

   426     class EdgeIt : public Edge {

   427       friend class ListGraph;

   428       //protected:

   429     public: //for alpar

   430       EdgeIt(const ListGraph& G) {

   431 	node_item* v=G._first_node;

   432 	if (v) edge=v->_first_out_edge; else edge=0;

   433 	while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; }

   434       }

   435     public:

   436       EdgeIt() : Edge() { }

   437       EdgeIt(const Invalid& i) : Edge(i) { }

   438     protected:

   439       EdgeIt(edge_item* _e) : Edge(_e) { }

   440       EdgeIt& operator++() {

   441 	node_item* v=edge->_tail;

   442 	edge=edge->_next_out;

   443 	while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; }

   444 	return *this;

   445       }

   446     };

   448     class OutEdgeIt : public Edge {

   449       friend class ListGraph;

   450       //node_item* v;

   451       //protected:

   452     protected: //for alpar

   453       OutEdgeIt(const Node& _v) /*: v(_v.node)*/ { edge=_v.node->_first_out_edge; }

   454     public:

   455       OutEdgeIt() : Edge()/*, v(0)*/ { }

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

   457       OutEdgeIt(const ListGraph&, Node _v) /*: v(_v.node)*/ { edge=_v.node->_first_out_edge; }

   458     protected:

   459       OutEdgeIt& operator++() { edge=edge->_next_out; return *this; }

   460     protected:

   461       Node aNode() const { return Node(edge->_tail); }

   462       Node bNode() const { return Node(edge->_head); }

   463     };

   465     class InEdgeIt : public Edge {

   466       friend class ListGraph;

   467       //node_item* v;

   468       //protected:

   469     protected: //for alpar

   470       InEdgeIt(const Node& _v) /*: v(_v.node)*/ { edge=_v.node->_first_in_edge; }

   471     public:

   472       InEdgeIt() : Edge()/*, v(0)*/ { }

   473       InEdgeIt(const Invalid& i) : Edge(i) { }

   474       InEdgeIt(const ListGraph&, Node _v) /*: v(_v.node)*/ { edge=_v.node->_first_in_edge; }

   475     protected:

   476       InEdgeIt& operator++() { edge=edge->_next_in; return *this; }

   477     protected:

   478       Node aNode() const { return Node(edge->_head); }

   479       Node bNode() const { return Node(edge->_tail); }

   480     };

   482     class SymEdgeIt : public Edge {

   483       friend class ListGraph;

   484       bool out_or_in; //1 iff out, 0 iff in

   485       //node_item* v;

   486       //protected:

   487     protected: //for alpar

   488       SymEdgeIt(const Node& _v) /*: v(_v.node)*/ {

   489 	out_or_in=1;

   490 	edge=_v.node->_first_out_edge;

   491 	if (!edge) { edge=_v.node->_first_in_edge; out_or_in=0; }

   492       }

   493     public:

   494       SymEdgeIt() : Edge() /*, v(0)*/ { }

   495       SymEdgeIt(const Invalid& i) : Edge(i) { }

   496       SymEdgeIt(const ListGraph&, Node _v) /*: v(_v.node)*/ {

   497 	out_or_in=1;

   498 	edge=_v.node->_first_out_edge;

   499 	if (!edge) { edge=_v.node->_first_in_edge; out_or_in=0; }

   500       }

   501     protected:

   502       SymEdgeIt& operator++() {

   503 	if (out_or_in) {

   504 	  node_item* v=edge->_tail;

   505 	  edge=edge->_next_out;

   506 	  if (!edge) { out_or_in=0; edge=v->_first_in_edge; }

   507 	} else {

   508 	  edge=edge->_next_in;

   509 	}

   510 	return *this;

   511       }

   512     protected:

   513       Node aNode() const {

   514 	return (out_or_in) ? Node(edge->_tail) : Node(edge->_head); }

   515       Node bNode() const {

   516 	return (out_or_in) ? Node(edge->_head) : Node(edge->_tail); }

   517     };

   518   };

   520   inline

   521   std::ostream& operator<<(std::ostream& os, const ListGraph::Node& i) {

   522     if (i.valid())

   523       os << i.node->id;

   524     else

   525       os << "invalid";

   526     return os;

   527   }

   529   inline

   530   std::ostream& operator<<(std::ostream& os, const ListGraph::Edge& i) {

   531     if (i.valid())

   532       os << "(" << i.tailNode() << "--" << i.edge->id << "->"

   533 	 << i.headNode() << ")";

   534     else

   535       os << "invalid";

   536     return os;

   537   }

   539   class UndirListGraph : public ListGraph {

   540   public:

   541     typedef SymEdgeIt OutEdgeIt;

   542     typedef SymEdgeIt InEdgeIt;

   543   };

   545 } //namespace hugo

   547 #endif //HUGO_LIST_GRAPH_H

author	alpar
	Tue, 11 May 2004 19:38:00 +0000
changeset 614	75cf1d52eee5
parent 443	178fb74b22d1
permissions	-rw-r--r--