lemon-0.x: src/work/list_graph.h@0bd4fe53b1d0

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

     2 #ifndef LIST_GRAPH_H

     3 #define 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       T& operator[](Node n) { return container[/*G.id(n)*/n.node->id]; }

    49       const T& operator[](Node n) const {

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

    51       }

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

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

    54     };

    56     template <typename T>

    57     class EdgeMap {

    58       const ListGraph& G;

    59       std::vector<T> container;

    60     public:

    61       typedef T ValueType;

    62       typedef Edge KeyType;

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

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

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

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

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

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

    69       const T& operator[](Edge e) const {

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

    71       }

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

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

    74     };

    76     int node_id;

    77     int edge_id;

    78     int _node_num;

    79     int _edge_num;

    81     node_item* _first_node;

    82     node_item* _last_node;

    84     class node_item {

    85       friend class ListGraph;

    86       template <typename T> friend class NodeMap;

    88       friend class Node;

    89       friend class NodeIt;

    90       friend class Edge;

    91       friend class EdgeIt;

    92       friend class OutEdgeIt;

    93       friend class InEdgeIt;

    94       friend class SymEdgeIt;

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

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

    97       //ListGraph* G;

    98       int id;

    99       edge_item* _first_out_edge;

   100       edge_item* _last_out_edge;

   101       edge_item* _first_in_edge;

   102       edge_item* _last_in_edge;

   103       node_item* _next_node;

   104       node_item* _prev_node;

   105     public:

   106       node_item() { }

   107     };

   109     class edge_item {

   110       friend class ListGraph;

   111       template <typename T> friend class EdgeMap;

   113       friend class Node;

   114       friend class NodeIt;

   115       friend class Edge;

   116       friend class EdgeIt;

   117       friend class OutEdgeIt;

   118       friend class InEdgeIt;

   119       friend class SymEdgeIt;

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

   121       //ListGraph* G;

   122       int id;

   123       node_item* _tail;

   124       node_item* _head;

   125       edge_item* _next_out;

   126       edge_item* _prev_out;

   127       edge_item* _next_in;

   128       edge_item* _prev_in;

   129     public:

   130       edge_item() { }

   131     };

   133     node_item* _add_node() {

   134       node_item* p=new node_item;

   135       p->id=node_id++;

   136       p->_first_out_edge=0;

   137       p->_last_out_edge=0;

   138       p->_first_in_edge=0;

   139       p->_last_in_edge=0;

   140       p->_prev_node=_last_node;

   141       p->_next_node=0;

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

   143       _last_node=p;

   144       if (!_first_node) _first_node=p;

   146       ++_node_num;

   147       return p;

   148     }

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

   151       edge_item* e=new edge_item;

   152       e->id=edge_id++;

   153       e->_tail=_tail;

   154       e->_head=_head;

   156       e->_prev_out=_tail->_last_out_edge;

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

   158       _tail->_last_out_edge=e;

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

   160       e->_next_out=0;

   162       e->_prev_in=_head->_last_in_edge;

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

   164       _head->_last_in_edge=e;

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

   166       e->_next_in=0;

   168       ++_edge_num;

   169       return e;

   170     }

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

   173     void _delete_node(node_item* v) {

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

   175 	_last_node=v->_prev_node;

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

   177 	_first_node=v->_next_node;

   179       delete v;

   180       --_node_num;

   181     }

   183     void _delete_edge(edge_item* e) {

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

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

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

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

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

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

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

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

   193       delete e;

   194       --_edge_num;

   195     }

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

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

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

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

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

   203       e->_tail=_tail;

   205       e->_prev_out=_tail->_last_out_edge;

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

   207       _tail->_last_out_edge=e;

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

   209       e->_next_out=0;

   210     }

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

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

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

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

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

   218       e->_head=_head;

   220       e->_prev_in=_head->_last_in_edge;

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

   222       _head->_last_in_edge=e;

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

   224       e->_next_in=0;

   225     }

   227   public:

   229     /* default constructor */

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

   233     ~ListGraph() {

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

   235     }

   237     int nodeNum() const { return _node_num; }

   238     int edgeNum() const { return _edge_num; }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   265     /* same methods in other style */

   266     /* for experimental purpose */

   268     NodeIt& /*getF*/first(NodeIt& v) const {

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

   270     EdgeIt& /*getF*/first(EdgeIt& e) const {

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

   272     OutEdgeIt& /*getF*/first(OutEdgeIt& e, Node v) const {

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

   274     InEdgeIt& /*getF*/first(InEdgeIt& e, Node v) const {

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

   276     SymEdgeIt& /*getF*/first(SymEdgeIt& e, Node v) const {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   293     template< typename It >

   294     It first() const {

   295       It e;

   296       /*getF*/first(e);

   297       return e;

   298     }

   300     template< typename It >

   301     It first(Node v) const {

   302       It e;

   303       /*getF*/first(e, v);

   304       return e;

   305     }

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

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

   310     template <typename It> It getNext(It it) const {

   311       It tmp(it); return next(tmp); }

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

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

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

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

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

   321     /* adding nodes and edges */

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

   324     Edge addEdge(Node u, Node v) {

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

   326     }

   328     void erase(Node i) {

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

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

   331       _delete_node(i.node);

   332     }

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

   336     void clear() {

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

   338     }

   340     void setTail(Edge e, Node tail) {

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

   342     }

   344     void setHead(Edge e, Node head) {

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

   346     }

   348     /* stream operations, for testing purpose */

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

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

   352     }

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

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

   355       return os;

   356     }

   358     class Node {

   359       friend class ListGraph;

   360       template <typename T> friend class NodeMap;

   362       friend class Edge;

   363       friend class OutEdgeIt;

   364       friend class InEdgeIt;

   365       friend class SymEdgeIt;

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

   367     protected:

   368       node_item* node;

   369     protected:

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

   371     public:

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

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

   374     protected:

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

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

   377     public:

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

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

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

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

   382     };

   384     class NodeIt : public Node {

   385       friend class ListGraph;

   386       //protected:

   387     public: //for everybody but marci

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

   389     public:

   390       NodeIt() : Node() { }

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

   392     protected:

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

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

   395       //FIXME::

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

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

   398     };

   400     class Edge {

   401       friend class ListGraph;

   402       template <typename T> friend class EdgeMap;

   404       friend class Node;

   405       friend class NodeIt;

   406     protected:

   407       edge_item* edge;

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

   409     public:

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

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

   412       //Edge() { }

   413     protected:

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

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

   416     public:

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

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

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

   420     protected:

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

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

   423     public:

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

   425     };

   427     class EdgeIt : public Edge {

   428       friend class ListGraph;

   429       //protected:

   430     public: //for alpar

   431       EdgeIt(const ListGraph& G) {

   432 	node_item* v=G._first_node;

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

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

   435       }

   436     public:

   437       EdgeIt() : Edge() { }

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

   439     protected:

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

   441       EdgeIt& operator++() {

   442 	node_item* v=edge->_tail;

   443 	edge=edge->_next_out;

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

   445 	return *this;

   446       }

   447     };

   449     class OutEdgeIt : public Edge {

   450       friend class ListGraph;

   451       //node_item* v;

   452       //protected:

   453     protected: //for alpar

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

   455     public:

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

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

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

   459     protected:

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

   461     protected:

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

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

   464     };

   466     class InEdgeIt : public Edge {

   467       friend class ListGraph;

   468       //node_item* v;

   469       //protected:

   470     protected: //for alpar

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

   472     public:

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

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

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

   476     protected:

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

   478     protected:

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

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

   481     };

   483     class SymEdgeIt : public Edge {

   484       friend class ListGraph;

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

   486       //node_item* v;

   487       //protected:

   488     public: //for alpar

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

   490 	out_or_in=1;

   491 	edge=_v.node->_first_out_edge;

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

   493       }

   494     public:

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

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

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

   498 	out_or_in=1;

   499 	edge=_v.node->_first_out_edge;

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

   501       }

   502     protected:

   503       SymEdgeIt& operator++() {

   504 	if (out_or_in) {

   505 	  node_item* v=edge->_tail;

   506 	  edge=edge->_next_out;

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

   508 	} else {

   509 	  edge=edge->_next_in;

   510 	}

   511 	return *this;

   512       }

   513     protected:

   514       Node aNode() const {

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

   516       Node bNode() const {

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

   518     };

   520   };

   522 //   template< typename T >

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

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

   525 //     return T();

   526 //   }

   528 //   template<>

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

   530 //     return firstNode();

   531 //   }

   533 //   template<>

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

   535 //     return firstEdge();

   536 //   }

   538 //   template< typename T >

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

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

   541 //     return T();

   542 //   }

   544 //   template<>

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

   546 //     return firstOutEdge(v);

   547 //   }

   549 //   template<>

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

   551 //     return firstInEdge(v);

   552 //   }

   554 //   template<>

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

   556 //     return firstSymEdge(v);

   557 //   }

   560 } //namespace hugo

   562 #endif //LIST_GRAPH_H

author	alpar
	Fri, 19 Mar 2004 07:39:09 +0000
changeset 202	0bd4fe53b1d0
child 208	1e36245f905d
permissions	-rw-r--r--