lemon-0.x: src/work/list_graph.h@f5461f8bc59b

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

     2 #ifndef HUGO_LIST_GRAPH_H

     3 #define HUGO_LIST_GRAPH_H

     5 #include <iostream>

     6 #include <vector>

     8 #include <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     class node_item;

    21     class 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     int node_id;

    79     int edge_id;

    80     int _node_num;

    81     int _edge_num;

    83     node_item* _first_node;

    84     node_item* _last_node;

    86     class node_item {

    87       friend class ListGraph;

    88       template <typename T> friend class NodeMap;

    90       friend class Node;

    91       friend class NodeIt;

    92       friend class Edge;

    93       friend class EdgeIt;

    94       friend class OutEdgeIt;

    95       friend class InEdgeIt;

    96       friend class SymEdgeIt;

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

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

    99       //ListGraph* G;

   100       int id;

   101       edge_item* _first_out_edge;

   102       edge_item* _last_out_edge;

   103       edge_item* _first_in_edge;

   104       edge_item* _last_in_edge;

   105       node_item* _next_node;

   106       node_item* _prev_node;

   107     public:

   108       node_item() { }

   109     };

   111     class edge_item {

   112       friend class ListGraph;

   113       template <typename T> friend class EdgeMap;

   115       friend class Node;

   116       friend class NodeIt;

   117       friend class Edge;

   118       friend class EdgeIt;

   119       friend class OutEdgeIt;

   120       friend class InEdgeIt;

   121       friend class SymEdgeIt;

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

   123       //ListGraph* G;

   124       int id;

   125       node_item* _tail;

   126       node_item* _head;

   127       edge_item* _next_out;

   128       edge_item* _prev_out;

   129       edge_item* _next_in;

   130       edge_item* _prev_in;

   131     public:

   132       edge_item() { }

   133     };

   135     node_item* _add_node() {

   136       node_item* p=new node_item;

   137       p->id=node_id++;

   138       p->_first_out_edge=0;

   139       p->_last_out_edge=0;

   140       p->_first_in_edge=0;

   141       p->_last_in_edge=0;

   142       p->_prev_node=_last_node;

   143       p->_next_node=0;

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

   145       _last_node=p;

   146       if (!_first_node) _first_node=p;

   148       ++_node_num;

   149       return p;

   150     }

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

   153       edge_item* e=new edge_item;

   154       e->id=edge_id++;

   155       e->_tail=_tail;

   156       e->_head=_head;

   158       e->_prev_out=_tail->_last_out_edge;

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

   160       _tail->_last_out_edge=e;

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

   162       e->_next_out=0;

   164       e->_prev_in=_head->_last_in_edge;

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

   166       _head->_last_in_edge=e;

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

   168       e->_next_in=0;

   170       ++_edge_num;

   171       return e;

   172     }

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

   175     void _delete_node(node_item* v) {

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

   177 	_last_node=v->_prev_node;

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

   179 	_first_node=v->_next_node;

   181       delete v;

   182       --_node_num;

   183     }

   185     void _delete_edge(edge_item* e) {

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

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

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

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

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

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

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

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

   195       delete e;

   196       --_edge_num;

   197     }

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

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

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

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

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

   205       e->_tail=_tail;

   207       e->_prev_out=_tail->_last_out_edge;

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

   209       _tail->_last_out_edge=e;

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

   211       e->_next_out=0;

   212     }

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

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

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

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

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

   220       e->_head=_head;

   222       e->_prev_in=_head->_last_in_edge;

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

   224       _head->_last_in_edge=e;

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

   226       e->_next_in=0;

   227     }

   229   public:

   231     /* default constructor */

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

   235     ~ListGraph() {

   236       NodeIt n;

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

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

   239     }

   241     int nodeNum() const { return _node_num; }

   242     int edgeNum() const { return _edge_num; }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   269     /* same methods in other style */

   270     /* for experimental purpose */

   272     NodeIt& first(NodeIt& v) const {

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

   274     EdgeIt& first(EdgeIt& e) const {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   297     template< typename It >

   298     It first() const {

   299       It e;

   300       first(e);

   301       return e;

   302     }

   304     template< typename It >

   305     It first(Node v) const {

   306       It e;

   307       first(e, v);

   308       return e;

   309     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   331     /* adding nodes and edges */

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

   334     Edge addEdge(Node u, Node v) {

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

   336     }

   338     void erase(Node i) {

   339       {

   340 	OutEdgeIt e;

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

   342       }

   343       {

   344 	InEdgeIt e;

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

   346       }

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

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

   349       _delete_node(i.node);

   350     }

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

   354     void clear() {

   355       while (first<NodeIt>().valid()) erase(first<NodeIt>());

   356     }

   358     void setTail(Edge e, Node tail) {

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

   360     }

   362     void setHead(Edge e, Node head) {

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

   364     }

   366     /* stream operations, for testing purpose */

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

   369       os << i.node->id; return os;

   370     }

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

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

   373       return os;

   374     }

   376     class Node {

   377       friend class ListGraph;

   378       template <typename T> friend class NodeMap;

   380       friend class Edge;

   381       friend class OutEdgeIt;

   382       friend class InEdgeIt;

   383       friend class SymEdgeIt;

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

   385     protected:

   386       node_item* node;

   387     protected:

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

   389     public:

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

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

   392     protected:

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

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

   395     public:

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

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

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

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

   400     };

   402     class NodeIt : public Node {

   403       friend class ListGraph;

   404       //protected:

   405     public: //for everybody but marci

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

   407     public:

   408       NodeIt() : Node() { }

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

   410     protected:

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

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

   413       //FIXME::

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

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

   416     };

   418     class Edge {

   419       friend class ListGraph;

   420       template <typename T> friend class EdgeMap;

   422       friend class Node;

   423       friend class NodeIt;

   424     protected:

   425       edge_item* edge;

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

   427     public:

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

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

   430       //Edge() { }

   431     protected:

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

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

   434     public:

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

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

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

   438     protected:

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

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

   441     public:

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

   443     };

   445     class EdgeIt : public Edge {

   446       friend class ListGraph;

   447       //protected:

   448     public: //for alpar

   449       EdgeIt(const ListGraph& G) {

   450 	node_item* v=G._first_node;

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

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

   453       }

   454     public:

   455       EdgeIt() : Edge() { }

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

   457     protected:

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

   459       EdgeIt& operator++() {

   460 	node_item* v=edge->_tail;

   461 	edge=edge->_next_out;

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

   463 	return *this;

   464       }

   465     };

   467     class OutEdgeIt : public Edge {

   468       friend class ListGraph;

   469       //node_item* v;

   470       //protected:

   471     protected: //for alpar

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

   473     public:

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

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

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

   477     protected:

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

   479     protected:

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

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

   482     };

   484     class InEdgeIt : public Edge {

   485       friend class ListGraph;

   486       //node_item* v;

   487       //protected:

   488     protected: //for alpar

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

   490     public:

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

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

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

   494     protected:

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

   496     protected:

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

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

   499     };

   501     class SymEdgeIt : public Edge {

   502       friend class ListGraph;

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

   504       //node_item* v;

   505       //protected:

   506     public: //for alpar

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

   508 	out_or_in=1;

   509 	edge=_v.node->_first_out_edge;

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

   511       }

   512     public:

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

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

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

   516 	out_or_in=1;

   517 	edge=_v.node->_first_out_edge;

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

   519       }

   520     protected:

   521       SymEdgeIt& operator++() {

   522 	if (out_or_in) {

   523 	  node_item* v=edge->_tail;

   524 	  edge=edge->_next_out;

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

   526 	} else {

   527 	  edge=edge->_next_in;

   528 	}

   529 	return *this;

   530       }

   531     protected:

   532       Node aNode() const {

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

   534       Node bNode() const {

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

   536     };

   538   };

   540 //   template< typename T >

   541 //   T ListGraph::first() const {

   542 //     std::cerr << "Invalid use of template<typemane T> T ListGraph::first<T>();" << std::endl;

   543 //     return T();

   544 //   }

   546 //   template<>

   547 //   ListGraph::NodeIt ListGraph::first<ListGraph::NodeIt>() const {

   548 //     return firstNode();

   549 //   }

   551 //   template<>

   552 //   ListGraph::EdgeIt ListGraph::first<ListGraph::EdgeIt>() const {

   553 //     return firstEdge();

   554 //   }

   556 //   template< typename T >

   557 //   T ListGraph::first(ListGraph::Node v) const {

   558 //     std::cerr << "Invalid use of template<typemane T> T ListGraph::first<T>(ListGRaph::Node);" << std::endl;

   559 //     return T();

   560 //   }

   562 //   template<>

   563 //   ListGraph::OutEdgeIt ListGraph::first<ListGraph::OutEdgeIt>(const ListGraph::Node v) const {

   564 //     return firstOutEdge(v);

   565 //   }

   567 //   template<>

   568 //   ListGraph::InEdgeIt ListGraph::first<ListGraph::InEdgeIt>(const ListGraph::Node v) const {

   569 //     return firstInEdge(v);

   570 //   }

   572 //   template<>

   573 //   ListGraph::SymEdgeIt ListGraph::first<ListGraph::SymEdgeIt>(const ListGraph::Node v) const {

   574 //     return firstSymEdge(v);

   575 //   }

   578 } //namespace hugo

   580 #endif //HUGO_LIST_GRAPH_H

author	athos
	Thu, 15 Apr 2004 17:03:44 +0000
changeset 331	f5461f8bc59b
parent 304	10d035c2e81c
child 335	999eb3cd7b49
permissions	-rw-r--r--