COIN-OR::LEMON - Graph Library

source: lemon-0.x/src/work/list_graph.hh @ 169:940b13aba5ff

Last change on this file since 169:940b13aba5ff was 148:004fdf703abb, checked in by marci, 17 years ago

G.next(...), G.valid(...), ...

File size: 17.1 KB
Line 
1#ifndef LIST_GRAPH_HH
2#define LIST_GRAPH_HH
3
4#include <iostream>
5#include <vector>
6
7namespace hugo {
8
9  template <typename It>
10  int count(It it) {
11    int i=0;
12    for( ; it.valid(); ++it) { ++i; }
13    return i;
14  }
15
16  class ListGraph {
17
18    class node_item;
19    class edge_item;
20
21  public:
22
23    class NodeIt;
24    class EachNodeIt;
25    class EdgeIt;
26    class EachEdgeIt;
27    class OutEdgeIt;
28    class InEdgeIt;
29    class SymEdgeIt;
30    template <typename T> class NodeMap;
31    template <typename T> class EdgeMap;
32   
33  private:
34   
35    template <typename T> friend class NodeMap;
36    template <typename T> friend class EdgeMap;
37
38    template <typename T>
39    class NodeMap {
40      const ListGraph& G;
41      std::vector<T> container;
42    public:
43      typedef T ValueType;
44      typedef NodeIt KeyType;
45      NodeMap(const ListGraph& _G) : G(_G), container(G.node_id) { }
46      NodeMap(const ListGraph& _G, T a) :
47        G(_G), container(G.node_id, a) { }
48      void set(NodeIt n, T a) { container[/*G.id(n)*/n.node->id]=a; }
49      T get(NodeIt n) const { return container[/*G.id(n)*/n.node->id]; }
50      T& operator[](NodeIt n) { return container[/*G.id(n)*/n.node->id]; }
51      const T& operator[](NodeIt n) const { return container[/*G.id(n)*/n.node->id]; }
52      void update() { container.resize(G.node_id); }
53      void update(T a) { container.resize(G.node_id, a); }
54    };
55
56    template <typename T>
57    class EdgeMap {
58      const ListGraph& G;
59      std::vector<T> container;
60    public:
61      typedef T ValueType;
62      typedef EdgeIt 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(EdgeIt e, T a) { container[/*G.id(e)*/e.edge->id]=a; }
67      T get(EdgeIt e) const { return container[/*G.id(e)*/e.edge->id]; }
68      T& operator[](EdgeIt e) { return container[/*G.id(e)*/e.edge->id]; }
69      const T& operator[](EdgeIt e) const { return container[/*G.id(e)*/e.edge->id]; }
70      void update() { container.resize(G.edge_id); }
71      void update(T a) { container.resize(G.edge_id, a); }
72    };
73
74    int node_id;
75    int edge_id;
76    int _node_num;
77    int _edge_num;
78
79    node_item* _first_node;
80    node_item* _last_node;
81
82    class node_item {
83      friend class ListGraph;
84      template <typename T> friend class NodeMap;
85     
86      friend class NodeIt;
87      friend class EachNodeIt;
88      friend class EdgeIt;
89      friend class EachEdgeIt;
90      friend class OutEdgeIt;
91      friend class InEdgeIt;
92      friend class SymEdgeIt;
93      friend std::ostream& operator<<(std::ostream& os, const NodeIt& i);
94      friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i);
95      //ListGraph* G;
96      int id;
97      edge_item* _first_out_edge;
98      edge_item* _last_out_edge;
99      edge_item* _first_in_edge;
100      edge_item* _last_in_edge;
101      node_item* _next_node;
102      node_item* _prev_node;
103    public:
104      node_item() { }
105    };
106
107    class edge_item {
108      friend class ListGraph;
109      template <typename T> friend class EdgeMap;
110
111      friend class NodeIt;
112      friend class EachNodeIt;
113      friend class EdgeIt;
114      friend class EachEdgeIt;
115      friend class OutEdgeIt;
116      friend class InEdgeIt;
117      friend class SymEdgeIt;
118      friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i);
119      //ListGraph* G;
120      int id;
121      node_item* _tail;
122      node_item* _head;
123      edge_item* _next_out;
124      edge_item* _prev_out;
125      edge_item* _next_in;
126      edge_item* _prev_in;
127    public:
128      edge_item() { }
129    };
130
131    node_item* _add_node() {
132      node_item* p=new node_item;
133      p->id=node_id++;
134      p->_first_out_edge=0;
135      p->_last_out_edge=0;
136      p->_first_in_edge=0;
137      p->_last_in_edge=0;
138      p->_prev_node=_last_node;
139      p->_next_node=0;
140      if (_last_node) _last_node->_next_node=p;
141      _last_node=p;
142      if (!_first_node) _first_node=p;
143
144      ++_node_num;
145      return p;
146    }
147
148    edge_item* _add_edge(node_item* _tail, node_item* _head) {
149      edge_item* e=new edge_item;
150      e->id=edge_id++;
151      e->_tail=_tail;
152      e->_head=_head;
153     
154      e->_prev_out=_tail->_last_out_edge;
155      if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e;
156      _tail->_last_out_edge=e;
157      if (!_tail->_first_out_edge) _tail->_first_out_edge=e;
158      e->_next_out=0;
159 
160      e->_prev_in=_head->_last_in_edge;
161      if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e;
162      _head->_last_in_edge=e;
163      if (!_head->_first_in_edge) { _head->_first_in_edge=e; }
164      e->_next_in=0;
165
166      ++_edge_num;
167      return e;
168    }
169
170    //deletes a node which has no out edge and no in edge
171    void _delete_node(node_item* v) {
172      if (v->_next_node) (v->_next_node)->_prev_node=v->_prev_node; else
173        _last_node=v->_prev_node;
174      if (v->_prev_node) (v->_prev_node)->_next_node=v->_next_node; else
175        _first_node=v->_next_node;
176
177      delete v;
178      --_node_num;
179    }
180
181    void _delete_edge(edge_item* e) {
182      if (e->_next_out) (e->_next_out)->_prev_out=e->_prev_out; else
183        (e->_tail)->_last_out_edge=e->_prev_out;
184      if (e->_prev_out) (e->_prev_out)->_next_out=e->_next_out; else
185        (e->_tail)->_first_out_edge=e->_next_out;
186      if (e->_next_in) (e->_next_in)->_prev_in=e->_prev_in; else
187        (e->_head)->_last_in_edge=e->_prev_in;
188      if (e->_prev_in) (e->_prev_in)->_next_in=e->_next_in; else
189        (e->_head)->_first_in_edge=e->_next_in;
190
191      delete e;
192      --_edge_num;
193    }
194
195    void _set_tail(edge_item* e, node_item* _tail) {
196      if (e->_next_out) (e->_next_out)->_prev_out=e->_prev_out; else
197        (e->_tail)->_last_out_edge=e->_prev_out;
198      if (e->_prev_out) (e->_prev_out)->_next_out=e->_next_out; else
199        (e->_tail)->_first_out_edge=e->_next_out;
200     
201      e->_tail=_tail;
202     
203      e->_prev_out=_tail->_last_out_edge;
204      if (_tail->_last_out_edge) (_tail->_last_out_edge)->_next_out=e;
205      _tail->_last_out_edge=e;
206      if (!_tail->_first_out_edge) _tail->_first_out_edge=e;
207      e->_next_out=0;
208    }
209
210    void _set_head(edge_item* e, node_item* _head) {
211      if (e->_next_in) (e->_next_in)->_prev_in=e->_prev_in; else
212        (e->_head)->_last_in_edge=e->_prev_in;
213      if (e->_prev_in) (e->_prev_in)->_next_in=e->_next_in; else
214        (e->_head)->_first_in_edge=e->_next_in;
215     
216      e->_head=_head;
217     
218      e->_prev_in=_head->_last_in_edge;
219      if (_head->_last_in_edge) (_head->_last_in_edge)->_next_in=e;
220      _head->_last_in_edge=e;
221      if (!_head->_first_in_edge) { _head->_first_in_edge=e; }
222      e->_next_in=0;
223    }
224
225  public:
226
227    /* default constructor */
228
229    ListGraph() : node_id(0), edge_id(0), _node_num(0), _edge_num(0), _first_node(0), _last_node(0) { }
230   
231    ~ListGraph() {
232      while (first<EachNodeIt>().valid()) erase(first<EachNodeIt>());
233    }
234
235    int nodeNum() const { return _node_num; }
236    int edgeNum() const { return _edge_num; }
237
238    /* functions to construct iterators from the graph, or from each other */
239
240    //EachNodeIt firstNode() const { return EachNodeIt(*this); }
241    //EachEdgeIt firstEdge() const { return EachEdgeIt(*this); }
242   
243    //OutEdgeIt firstOutEdge(const NodeIt v) const { return OutEdgeIt(v); }
244    //InEdgeIt firstInEdge(const NodeIt v) const { return InEdgeIt(v); }
245    //SymEdgeIt firstSymEdge(const NodeIt v) const { return SymEdgeIt(v); }
246    NodeIt tail(EdgeIt e) const { return e.tailNode(); }
247    NodeIt head(EdgeIt e) const { return e.headNode(); }
248
249    NodeIt aNode(const OutEdgeIt& e) const { return e.aNode(); }
250    NodeIt aNode(const InEdgeIt& e) const { return e.aNode(); }
251    NodeIt aNode(const SymEdgeIt& e) const { return e.aNode(); }
252
253    NodeIt bNode(const OutEdgeIt& e) const { return e.bNode(); }
254    NodeIt bNode(const InEdgeIt& e) const { return e.bNode(); }
255    NodeIt bNode(const SymEdgeIt& e) const { return e.bNode(); }
256
257    //NodeIt invalid_node() { return NodeIt(); }
258    //EdgeIt invalid_edge() { return EdgeIt(); }
259    //OutEdgeIt invalid_out_edge() { return OutEdgeIt(); }
260    //InEdgeIt invalid_in_edge() { return InEdgeIt(); }
261    //SymEdgeIt invalid_sym_edge() { return SymEdgeIt(); }
262
263    /* same methods in other style */
264    /* for experimental purpose */
265
266    EachNodeIt& getFirst(EachNodeIt& v) const {
267      v=EachNodeIt(*this); return v; }
268    EachEdgeIt& getFirst(EachEdgeIt& e) const {
269      e=EachEdgeIt(*this); return e; }
270    OutEdgeIt& getFirst(OutEdgeIt& e, NodeIt v) const {
271      e=OutEdgeIt(v); return e; }
272    InEdgeIt& getFirst(InEdgeIt& e, NodeIt v) const {
273      e=InEdgeIt(v); return e; }
274    SymEdgeIt& getFirst(SymEdgeIt& e, NodeIt v) const {
275      e=SymEdgeIt(v); return e; }
276    //void getTail(NodeIt& n, const EdgeIt& e) const { n=tail(e); }
277    //void getHead(NodeIt& n, const EdgeIt& e) const { n=head(e); }
278
279    //void getANode(NodeIt& n, const OutEdgeIt& e) const { n=e.aNode(); }
280    //void getANode(NodeIt& n, const InEdgeIt& e) const { n=e.aNode(); }
281    //void getANode(NodeIt& n, const SymEdgeIt& e) const { n=e.aNode(); }
282    //void getBNode(NodeIt& n, const OutEdgeIt& e) const { n=e.bNode(); }
283    //void getBNode(NodeIt& n, const InEdgeIt& e) const { n=e.bNode(); }
284    //void getBNode(NodeIt& n, const SymEdgeIt& e) const { n=e.bNode(); }
285    //void get_invalid(NodeIt& n) { n=NodeIt(); }
286    //void get_invalid(EdgeIt& e) { e=EdgeIt(); }
287    //void get_invalid(OutEdgeIt& e) { e=OutEdgeIt(); }
288    //void get_invalid(InEdgeIt& e) { e=InEdgeIt(); }
289    //void get_invalid(SymEdgeIt& e) { e=SymEdgeIt(); }
290
291    template< typename It >
292    It first() const {
293      It e;
294      getFirst(e);
295      return e;
296    }
297
298    template< typename It >
299    It first(NodeIt v) const {
300      It e;
301      getFirst(e, v);
302      return e;
303    }
304
305    bool valid(NodeIt n) const { return n.valid(); }
306    bool valid(EdgeIt e) const { return e.valid(); }
307   
308    template <typename It> It getNext(It it) const {
309      It tmp(it); return next(tmp); }
310    template <typename It> It& next(It& it) const { return ++it; }
311   
312
313    /* for getting id's of graph objects */
314    /* these are important for the implementation of property vectors */
315
316    int id(NodeIt v) const { return v.node->id; }
317    int id(EdgeIt e) const { return e.edge->id; }
318
319    /* adding nodes and edges */
320
321    NodeIt addNode() { return NodeIt(_add_node()); }
322    EdgeIt addEdge(NodeIt u, NodeIt v) {
323      return EdgeIt(_add_edge(u.node, v.node));
324    }
325
326    void erase(NodeIt i) {
327      while (first<OutEdgeIt>(i).valid()) erase(first<OutEdgeIt>(i));
328      while (first<InEdgeIt>(i).valid()) erase(first<InEdgeIt>(i));
329      _delete_node(i.node);
330    }
331 
332    void erase(EdgeIt e) { _delete_edge(e.edge); }
333
334    void clear() {
335      while (first<EachNodeIt>().valid()) erase(first<EachNodeIt>());
336    }
337
338    void setTail(EdgeIt e, NodeIt tail) {
339      _set_tail(e.edge, tail.node);
340    }
341
342    void setHead(EdgeIt e, NodeIt head) {
343      _set_head(e.edge, head.node);
344    }
345
346    /* stream operations, for testing purpose */
347
348    friend std::ostream& operator<<(std::ostream& os, const NodeIt& i) {
349      os << i.node->id; return os;
350    }
351    friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i) {
352      os << "(" << i.edge->_tail->id << "--" << i.edge->id << "->" << i.edge->_head->id << ")";
353      return os;
354    }
355
356    class NodeIt {
357      friend class ListGraph;
358      template <typename T> friend class NodeMap;
359
360      friend class EdgeIt;
361      friend class OutEdgeIt;
362      friend class InEdgeIt;
363      friend class SymEdgeIt;
364      //public:  //FIXME: It is required by op= of EachNodeIt
365    protected:
366      node_item* node;
367    protected:
368      friend int ListGraph::id(NodeIt v) const;
369    public:
370      NodeIt() : node(0) { }
371      NodeIt(node_item* _node) : node(_node) { }
372      bool valid() const { return (node!=0); }
373      //void makeInvalid() { node=0; }
374      friend bool operator==(const NodeIt& u, const NodeIt& v) {
375        return v.node==u.node;
376      }
377      friend bool operator!=(const NodeIt& u, const NodeIt& v) {
378        return v.node!=u.node;
379      }
380      friend std::ostream& operator<<(std::ostream& os, const NodeIt& i);
381    };
382   
383    class EachNodeIt : public NodeIt {
384      friend class ListGraph;
385      //protected:
386    public: //for everybody but marci
387      EachNodeIt(const ListGraph& G) : NodeIt(G._first_node) { }
388    public:
389      EachNodeIt() : NodeIt() { }
390      EachNodeIt(node_item* v) : NodeIt(v) { }
391      EachNodeIt& operator++() { node=node->_next_node; return *this; }
392      //FIXME::
393      //      EachNodeIt& operator=(const NodeIt& e)
394      //      { node=e.node; return *this; }
395    };
396
397    class EdgeIt {
398      friend class ListGraph;
399      template <typename T> friend class EdgeMap;
400     
401      friend class NodeIt;
402      friend class EachNodeIt;
403    protected:
404      edge_item* edge;
405      friend int ListGraph::id(EdgeIt e) const;
406    public:
407      EdgeIt() : edge(0) { }
408      //EdgeIt() { }
409      EdgeIt(edge_item* _edge) : edge(_edge) { }
410      bool valid() const { return (edge!=0); }
411      //void makeInvalid() { edge=0; }
412      friend bool operator==(const EdgeIt& u, const EdgeIt& v) {
413        return v.edge==u.edge;
414      }
415      friend bool operator!=(const EdgeIt& u, const EdgeIt& v) {
416        return v.edge!=u.edge;
417      }
418    protected:
419      NodeIt tailNode() const { return NodeIt(edge->_tail); }
420      NodeIt headNode() const { return NodeIt(edge->_head); }
421    public:
422      friend std::ostream& operator<<(std::ostream& os, const EdgeIt& i);
423    };
424   
425    class EachEdgeIt : public EdgeIt {
426      friend class ListGraph;
427      //protected:
428    public: //for alpar
429      EachEdgeIt(const ListGraph& G) {
430        node_item* v=G._first_node;
431        if (v) edge=v->_first_out_edge; else edge=0;
432        while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; }
433      }
434    public:
435      EachEdgeIt() : EdgeIt() { }
436      EachEdgeIt(edge_item* _e) : EdgeIt(_e) { }
437      EachEdgeIt& operator++() {
438        node_item* v=edge->_tail;
439        edge=edge->_next_out;
440        while (v && !edge) { v=v->_next_node; if (v) edge=v->_first_out_edge; }
441        return *this;
442      }
443    };
444   
445    class OutEdgeIt : public EdgeIt {
446      friend class ListGraph;
447      //node_item* v;
448      //protected:
449    public: //for alpar
450      OutEdgeIt(const NodeIt& _v) /*: v(_v.node)*/ { edge=_v.node->_first_out_edge; }
451    public:
452      OutEdgeIt() : EdgeIt()/*, v(0)*/ { }
453      OutEdgeIt(const ListGraph& G, NodeIt _v) /*: v(_v.node)*/ { edge=_v.node->_first_out_edge; }
454      OutEdgeIt& operator++() { edge=edge->_next_out; return *this; }
455    protected:
456      NodeIt aNode() const { return NodeIt(edge->_tail); }
457      NodeIt bNode() const { return NodeIt(edge->_head); }
458    };
459   
460    class InEdgeIt : public EdgeIt {
461      friend class ListGraph;
462      //node_item* v;
463      //protected:
464    public: //for alpar
465      InEdgeIt(const NodeIt& _v) /*: v(_v.node)*/ { edge=_v.node->_first_in_edge; }
466    public:
467      InEdgeIt() : EdgeIt()/*, v(0)*/ { }
468      InEdgeIt(const ListGraph& G, NodeIt _v) /*: v(_v.node)*/ { edge=_v.node->_first_in_edge; }
469      InEdgeIt& operator++() { edge=edge->_next_in; return *this; }
470    protected:
471      NodeIt aNode() const { return NodeIt(edge->_head); }
472      NodeIt bNode() const { return NodeIt(edge->_tail); }
473    };
474
475    class SymEdgeIt : public EdgeIt {
476      friend class ListGraph;
477      bool out_or_in; //1 iff out, 0 iff in
478      //node_item* v;
479      //protected:
480    public: //for alpar
481      SymEdgeIt(const NodeIt& _v) /*: v(_v.node)*/ {
482        out_or_in=1;
483        edge=_v.node->_first_out_edge;
484        if (!edge) { edge=_v.node->_first_in_edge; out_or_in=0; }
485      }
486    public:
487      SymEdgeIt() : EdgeIt() /*, v(0)*/ { }
488      SymEdgeIt(const ListGraph& G, NodeIt _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      SymEdgeIt& operator++() {
494        if (out_or_in) {
495          node_item* v=edge->_tail;
496          edge=edge->_next_out;
497          if (!edge) { out_or_in=0; edge=v->_first_in_edge; }
498        } else {
499          edge=edge->_next_in;
500        }
501        return *this;
502      }
503    protected:
504      NodeIt aNode() const {
505        return (out_or_in) ? NodeIt(edge->_tail) : NodeIt(edge->_head); }
506      NodeIt bNode() const {
507        return (out_or_in) ? NodeIt(edge->_head) : NodeIt(edge->_tail); }
508    };
509
510  };
511
512//   template< typename T >
513//   T ListGraph::first() const {
514//     std::cerr << "Invalid use of template<typemane T> T ListGraph::first<T>();" << std::endl;
515//     return T();
516//   }
517
518//   template<>
519//   ListGraph::EachNodeIt ListGraph::first<ListGraph::EachNodeIt>() const {
520//     return firstNode();
521//   }
522
523//   template<>
524//   ListGraph::EachEdgeIt ListGraph::first<ListGraph::EachEdgeIt>() const {
525//     return firstEdge();
526//   }
527
528//   template< typename T >
529//   T ListGraph::first(ListGraph::NodeIt v) const {
530//     std::cerr << "Invalid use of template<typemane T> T ListGraph::first<T>(ListGRaph::NodeIt);" << std::endl;
531//     return T();
532//   }
533
534//   template<>
535//   ListGraph::OutEdgeIt ListGraph::first<ListGraph::OutEdgeIt>(const ListGraph::NodeIt v) const {
536//     return firstOutEdge(v);
537//   }
538
539//   template<>
540//   ListGraph::InEdgeIt ListGraph::first<ListGraph::InEdgeIt>(const ListGraph::NodeIt v) const {
541//     return firstInEdge(v);
542//   }
543
544//   template<>
545//   ListGraph::SymEdgeIt ListGraph::first<ListGraph::SymEdgeIt>(const ListGraph::NodeIt v) const {
546//     return firstSymEdge(v);
547//   }
548
549
550} //namespace hugo
551
552#endif //LIST_GRAPH_HH
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