lemon-0.x: src/work/list_graph.h@4fbe868c1fb4

     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   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     class node_item {

    88       friend class ListGraph;

    89       template <typename T> friend class NodeMap;

    91       friend class Node;

    92       friend class NodeIt;

    93       friend class Edge;

    94       friend class EdgeIt;

    95       friend class OutEdgeIt;

    96       friend class InEdgeIt;

    97       friend class SymEdgeIt;

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

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

   100       //ListGraph* G;

   101       int id;

   102       edge_item* _first_out_edge;

   103       edge_item* _last_out_edge;

   104       edge_item* _first_in_edge;

   105       edge_item* _last_in_edge;

   106       node_item* _next_node;

   107       node_item* _prev_node;

   108     public:

   109       node_item() { }

   110     };

   112     class edge_item {

   113       friend class ListGraph;

   114       template <typename T> friend class EdgeMap;

   116       friend class Node;

   117       friend class NodeIt;

   118       friend class Edge;

   119       friend class EdgeIt;

   120       friend class OutEdgeIt;

   121       friend class InEdgeIt;

   122       friend class SymEdgeIt;

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

   124       //ListGraph* G;

   125       int id;

   126       node_item* _tail;

   127       node_item* _head;

   128       edge_item* _next_out;

   129       edge_item* _prev_out;

   130       edge_item* _next_in;

   131       edge_item* _prev_in;

   132     public:

   133       edge_item() { }

   134     };

   136     node_item* _add_node() {

   137       node_item* p=new node_item;

   138       p->id=node_id++;

   139       p->_first_out_edge=0;

   140       p->_last_out_edge=0;

   141       p->_first_in_edge=0;

   142       p->_last_in_edge=0;

   143       p->_prev_node=_last_node;

   144       p->_next_node=0;

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

   146       _last_node=p;

   147       if (!_first_node) _first_node=p;

   149       ++_node_num;

   150       return p;

   151     }

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

   154       edge_item* e=new edge_item;

   155       e->id=edge_id++;

   156       e->_tail=_tail;

   157       e->_head=_head;

   159       e->_prev_out=_tail->_last_out_edge;

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

   161       _tail->_last_out_edge=e;

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

   163       e->_next_out=0;

   165       e->_prev_in=_head->_last_in_edge;

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

   167       _head->_last_in_edge=e;

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

   169       e->_next_in=0;

   171       ++_edge_num;

   172       return e;

   173     }

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

   176     void _delete_node(node_item* v) {

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

   178 	_last_node=v->_prev_node;

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

   180 	_first_node=v->_next_node;

   182       delete v;

   183       --_node_num;

   184     }

   186     void _delete_edge(edge_item* e) {

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

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

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

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

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

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

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

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

   196       delete e;

   197       --_edge_num;

   198     }

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

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

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

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

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

   206       e->_tail=_tail;

   208       e->_prev_out=_tail->_last_out_edge;

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

   210       _tail->_last_out_edge=e;

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

   212       e->_next_out=0;

   213     }

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

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

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

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

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

   221       e->_head=_head;

   223       e->_prev_in=_head->_last_in_edge;

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

   225       _head->_last_in_edge=e;

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

   227       e->_next_in=0;

   228     }

   230   public:

   232     /* default constructor */

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

   236     ~ListGraph() {

   237       NodeIt n;

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

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

   240     }

   242     int nodeNum() const { return _node_num; }

   243     int edgeNum() const { return _edge_num; }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   270     /* same methods in other style */

   271     /* for experimental purpose */

   273     NodeIt& first(NodeIt& v) const {

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

   275     EdgeIt& first(EdgeIt& e) const {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   298 //     template< typename It >

   299 //     It first() const {

   300 //       It e;

   301 //       first(e);

   302 //       return e;

   303 //     }

   305 //     template< typename It >

   306 //     It first(Node v) const {

   307 //       It e;

   308 //       first(e, v);

   309 //       return e;

   310 //     }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   332     /* adding nodes and edges */

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

   335     Edge addEdge(Node u, Node v) {

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

   337     }

   339     void erase(Node i) {

   340       {

   341 	OutEdgeIt e;

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

   343       }

   344       {

   345 	InEdgeIt e;

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

   347       }

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

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

   350       _delete_node(i.node);

   351     }

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

   355     void clear() {

   356       NodeIt e;

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

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

   359     }

   361     void setTail(Edge e, Node tail) {

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

   363     }

   365     void setHead(Edge e, Node head) {

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

   367     }

   369     /* stream operations, for testing purpose */

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

   372       if (i.valid())

   373 	os << i.node->id;

   374       else

   375 	os << "invalid";

   376       return os;

   377     }

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

   379       if (i.valid())

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

   381       else

   382 	os << "invalid";

   383       return os;

   384     }

   386     class Node {

   387       friend class ListGraph;

   388       template <typename T> friend class NodeMap;

   390       friend class Edge;

   391       friend class OutEdgeIt;

   392       friend class InEdgeIt;

   393       friend class SymEdgeIt;

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

   395     protected:

   396       node_item* node;

   397     protected:

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

   399     public:

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

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

   402     protected:

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

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

   405     public:

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

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

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

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

   410     };

   412     class NodeIt : public Node {

   413       friend class ListGraph;

   414       //protected:

   415     public: //for everybody but marci

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

   417     public:

   418       NodeIt() : Node() { }

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

   420     protected:

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

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

   423       //FIXME::

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

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

   426     };

   428     class Edge {

   429       friend class ListGraph;

   430       template <typename T> friend class EdgeMap;

   432       friend class Node;

   433       friend class NodeIt;

   434     protected:

   435       edge_item* edge;

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

   437     public:

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

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

   440       //Edge() { }

   441     protected:

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

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

   444     public:

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

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

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

   448     protected:

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

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

   451     public:

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

   453     };

   455     class EdgeIt : public Edge {

   456       friend class ListGraph;

   457       //protected:

   458     public: //for alpar

   459       EdgeIt(const ListGraph& G) {

   460 	node_item* v=G._first_node;

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

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

   463       }

   464     public:

   465       EdgeIt() : Edge() { }

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

   467     protected:

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

   469       EdgeIt& operator++() {

   470 	node_item* v=edge->_tail;

   471 	edge=edge->_next_out;

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

   473 	return *this;

   474       }

   475     };

   477     class OutEdgeIt : public Edge {

   478       friend class ListGraph;

   479       //node_item* v;

   480       //protected:

   481     protected: //for alpar

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

   483     public:

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

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

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

   487     protected:

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

   489     protected:

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

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

   492     };

   494     class InEdgeIt : public Edge {

   495       friend class ListGraph;

   496       //node_item* v;

   497       //protected:

   498     protected: //for alpar

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

   500     public:

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

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

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

   504     protected:

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

   506     protected:

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

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

   509     };

   511     class SymEdgeIt : public Edge {

   512       friend class ListGraph;

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

   514       //node_item* v;

   515       //protected:

   516     protected: //for alpar

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

   518 	out_or_in=1;

   519 	edge=_v.node->_first_out_edge;

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

   521       }

   522     public:

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

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

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

   526 	out_or_in=1;

   527 	edge=_v.node->_first_out_edge;

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

   529       }

   530     protected:

   531       SymEdgeIt& operator++() {

   532 	if (out_or_in) {

   533 	  node_item* v=edge->_tail;

   534 	  edge=edge->_next_out;

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

   536 	} else {

   537 	  edge=edge->_next_in;

   538 	}

   539 	return *this;

   540       }

   541     protected:

   542       Node aNode() const {

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

   544       Node bNode() const {

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

   546     };

   547   };

   549   class UndirListGraph : public ListGraph {

   550   public:

   551     typedef SymEdgeIt OutEdgeIt;

   552     typedef SymEdgeIt InEdgeIt;

   553   };

   555 } //namespace hugo

   557 #endif //HUGO_LIST_GRAPH_H

author	alpar
	Mon, 26 Apr 2004 17:33:51 +0000
changeset 425	4fbe868c1fb4
parent 389	770cc1f4861f
child 436	6d632cb56ea3
permissions	-rw-r--r--