COIN-OR::LEMON - Graph Library

source: lemon-0.x/lemon/concept/graph.h @ 1624:61cc647dac99

Last change on this file since 1624:61cc647dac99 was 1624:61cc647dac99, checked in by Alpar Juttner, 14 years ago

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1/* -*- C++ -*-
2 * lemon/concept/graph.h - Part of LEMON, a generic C++ optimization library
3 *
4 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
5 * (Egervary Research Group on Combinatorial Optimization, EGRES).
6 *
7 * Permission to use, modify and distribute this software is granted
8 * provided that this copyright notice appears in all copies. For
9 * precise terms see the accompanying LICENSE file.
10 *
11 * This software is provided "AS IS" with no warranty of any kind,
12 * express or implied, and with no claim as to its suitability for any
13 * purpose.
14 *
15 */
16
17#ifndef LEMON_CONCEPT_GRAPH_H
18#define LEMON_CONCEPT_GRAPH_H
19
20///\ingroup graph_concepts
21///\file
22///\brief Declaration of Graph.
23
24#include <lemon/invalid.h>
25#include <lemon/utility.h>
26#include <lemon/concept/maps.h>
27#include <lemon/concept_check.h>
28#include <lemon/concept/graph_component.h>
29
30namespace lemon {
31  namespace concept {
32
33   
34    /**************** The full-featured graph concepts ****************/
35
36
37    /// \brief Modular static graph class.
38    ///     
39    /// It should be the same as the \c StaticGraph class.
40    class _StaticGraph
41      :  virtual public BaseGraphComponent,
42         public IterableGraphComponent, public MappableGraphComponent {
43    public:
44      ///\e
45
46      ///\todo undocumented
47      ///
48      typedef False UndirTag;
49     
50      typedef BaseGraphComponent::Node Node;
51      typedef BaseGraphComponent::Edge Edge;
52
53      template <typename _Graph>
54      struct Constraints {
55        void constraints() {
56          checkConcept<IterableGraphComponent, _Graph>();
57          checkConcept<MappableGraphComponent, _Graph>();
58        }
59      };
60    };
61
62    /// \brief Modular extendable graph class.
63    ///     
64    /// It should be the same as the \c ExtendableGraph class.
65    class _ExtendableGraph
66      :  virtual public BaseGraphComponent, public _StaticGraph,
67         public ExtendableGraphComponent, public ClearableGraphComponent {
68    public:
69      typedef BaseGraphComponent::Node Node;
70      typedef BaseGraphComponent::Edge Edge;
71
72      template <typename _Graph>
73      struct Constraints {
74        void constraints() {
75          checkConcept<_StaticGraph, _Graph >();
76          checkConcept<ExtendableGraphComponent, _Graph >();
77          checkConcept<ClearableGraphComponent, _Graph >();
78        }
79      };
80    };
81
82    /// \brief Modular erasable graph class.
83    ///     
84    /// It should be the same as the \c ErasableGraph class.
85    class _ErasableGraph
86      :  virtual public BaseGraphComponent, public _ExtendableGraph,
87         public ErasableGraphComponent {
88    public:
89      typedef BaseGraphComponent::Node Node;
90      typedef BaseGraphComponent::Edge Edge;
91
92      template <typename _Graph>
93      struct Constraints {
94        void constraints() {
95          checkConcept<_ExtendableGraph, _Graph >();
96          checkConcept<ErasableGraphComponent, _Graph >();
97        }
98      };
99    };
100
101    /// \addtogroup graph_concepts
102    /// @{
103
104    /// An empty static graph class.
105 
106    /// This class provides all the common features of a graph structure,
107    /// however completely without implementations and real data structures
108    /// behind the interface.
109    /// All graph algorithms should compile with this class, but it will not
110    /// run properly, of course.
111    ///
112    /// It can be used for checking the interface compatibility,
113    /// or it can serve as a skeleton of a new graph structure.
114    ///
115    /// Also, you will find here the full documentation of a certain graph
116    /// feature, the documentation of a real graph imlementation
117    /// like @ref ListGraph or
118    /// @ref SmartGraph will just refer to this structure.
119    ///
120    /// \todo A pages describing the concept of concept description would
121    /// be nice.
122    class StaticGraph
123    {
124    public:
125      ///\e
126
127      ///\todo undocumented
128      ///
129      typedef False UndirTag;
130
131      /// Defalult constructor.
132
133      /// Defalult constructor.
134      ///
135      StaticGraph() { }
136      ///Copy consructor.
137
138//       ///\todo It is not clear, what we expect from a copy constructor.
139//       ///E.g. How to assign the nodes/edges to each other? What about maps?
140//       StaticGraph(const StaticGraph& g) { }
141
142      /// The base type of node iterators,
143      /// or in other words, the trivial node iterator.
144
145      /// This is the base type of each node iterator,
146      /// thus each kind of node iterator converts to this.
147      /// More precisely each kind of node iterator should be inherited
148      /// from the trivial node iterator.
149      class Node {
150      public:
151        /// Default constructor
152
153        /// @warning The default constructor sets the iterator
154        /// to an undefined value.
155        Node() { }
156        /// Copy constructor.
157
158        /// Copy constructor.
159        ///
160        Node(const Node&) { }
161
162        /// Invalid constructor \& conversion.
163
164        /// This constructor initializes the iterator to be invalid.
165        /// \sa Invalid for more details.
166        Node(Invalid) { }
167        /// Equality operator
168
169        /// Two iterators are equal if and only if they point to the
170        /// same object or both are invalid.
171        bool operator==(Node) const { return true; }
172
173        /// Inequality operator
174       
175        /// \sa operator==(Node n)
176        ///
177        bool operator!=(Node) const { return true; }
178
179        /// Artificial ordering operator.
180       
181        /// To allow the use of graph descriptors as key type in std::map or
182        /// similar associative container we require this.
183        ///
184        /// \note This operator only have to define some strict ordering of
185        /// the items; this order has nothing to do with the iteration
186        /// ordering of the items.
187        ///
188        /// \bug This is a technical requirement. Do we really need this?
189        bool operator<(Node) const { return false; }
190
191      };
192   
193      /// This iterator goes through each node.
194
195      /// This iterator goes through each node.
196      /// Its usage is quite simple, for example you can count the number
197      /// of nodes in graph \c g of type \c Graph like this:
198      /// \code
199      /// int count=0;
200      /// for (Graph::NodeIt n(g); n!=INVALID; ++n) ++count;
201      /// \endcode
202      class NodeIt : public Node {
203      public:
204        /// Default constructor
205
206        /// @warning The default constructor sets the iterator
207        /// to an undefined value.
208        NodeIt() { }
209        /// Copy constructor.
210       
211        /// Copy constructor.
212        ///
213        NodeIt(const NodeIt& n) : Node(n) { }
214        /// Invalid constructor \& conversion.
215
216        /// Initialize the iterator to be invalid.
217        /// \sa Invalid for more details.
218        NodeIt(Invalid) { }
219        /// Sets the iterator to the first node.
220
221        /// Sets the iterator to the first node of \c g.
222        ///
223        NodeIt(const StaticGraph&) { }
224        /// Node -> NodeIt conversion.
225
226        /// Sets the iterator to the node of \c the graph pointed by
227        /// the trivial iterator.
228        /// This feature necessitates that each time we
229        /// iterate the edge-set, the iteration order is the same.
230        NodeIt(const StaticGraph&, const Node&) { }
231        /// Next node.
232
233        /// Assign the iterator to the next node.
234        ///
235        NodeIt& operator++() { return *this; }
236      };
237   
238   
239      /// The base type of the edge iterators.
240
241      /// The base type of the edge iterators.
242      ///
243      class Edge {
244      public:
245        /// Default constructor
246
247        /// @warning The default constructor sets the iterator
248        /// to an undefined value.
249        Edge() { }
250        /// Copy constructor.
251
252        /// Copy constructor.
253        ///
254        Edge(const Edge&) { }
255        /// Initialize the iterator to be invalid.
256
257        /// Initialize the iterator to be invalid.
258        ///
259        Edge(Invalid) { }
260        /// Equality operator
261
262        /// Two iterators are equal if and only if they point to the
263        /// same object or both are invalid.
264        bool operator==(Edge) const { return true; }
265        /// Inequality operator
266
267        /// \sa operator==(Edge n)
268        ///
269        bool operator!=(Edge) const { return true; }
270
271        /// Artificial ordering operator.
272       
273        /// To allow the use of graph descriptors as key type in std::map or
274        /// similar associative container we require this.
275        ///
276        /// \note This operator only have to define some strict ordering of
277        /// the items; this order has nothing to do with the iteration
278        /// ordering of the items.
279        ///
280        /// \bug This is a technical requirement. Do we really need this?
281        bool operator<(Edge) const { return false; }
282      };
283   
284      /// This iterator goes trough the outgoing edges of a node.
285
286      /// This iterator goes trough the \e outgoing edges of a certain node
287      /// of a graph.
288      /// Its usage is quite simple, for example you can count the number
289      /// of outgoing edges of a node \c n
290      /// in graph \c g of type \c Graph as follows.
291      /// \code
292      /// int count=0;
293      /// for (Graph::OutEdgeIt e(g, n); e!=INVALID; ++e) ++count;
294      /// \endcode
295   
296      class OutEdgeIt : public Edge {
297      public:
298        /// Default constructor
299
300        /// @warning The default constructor sets the iterator
301        /// to an undefined value.
302        OutEdgeIt() { }
303        /// Copy constructor.
304
305        /// Copy constructor.
306        ///
307        OutEdgeIt(const OutEdgeIt& e) : Edge(e) { }
308        /// Initialize the iterator to be invalid.
309
310        /// Initialize the iterator to be invalid.
311        ///
312        OutEdgeIt(Invalid) { }
313        /// This constructor sets the iterator to the first outgoing edge.
314   
315        /// This constructor sets the iterator to the first outgoing edge of
316        /// the node.
317        OutEdgeIt(const StaticGraph&, const Node&) { }
318        /// Edge -> OutEdgeIt conversion
319
320        /// Sets the iterator to the value of the trivial iterator.
321        /// This feature necessitates that each time we
322        /// iterate the edge-set, the iteration order is the same.
323        OutEdgeIt(const StaticGraph&, const Edge&) { }
324        ///Next outgoing edge
325       
326        /// Assign the iterator to the next
327        /// outgoing edge of the corresponding node.
328        OutEdgeIt& operator++() { return *this; }
329      };
330
331      /// This iterator goes trough the incoming edges of a node.
332
333      /// This iterator goes trough the \e incoming edges of a certain node
334      /// of a graph.
335      /// Its usage is quite simple, for example you can count the number
336      /// of outgoing edges of a node \c n
337      /// in graph \c g of type \c Graph as follows.
338      /// \code
339      /// int count=0;
340      /// for(Graph::InEdgeIt e(g, n); e!=INVALID; ++e) ++count;
341      /// \endcode
342
343      class InEdgeIt : public Edge {
344      public:
345        /// Default constructor
346
347        /// @warning The default constructor sets the iterator
348        /// to an undefined value.
349        InEdgeIt() { }
350        /// Copy constructor.
351
352        /// Copy constructor.
353        ///
354        InEdgeIt(const InEdgeIt& e) : Edge(e) { }
355        /// Initialize the iterator to be invalid.
356
357        /// Initialize the iterator to be invalid.
358        ///
359        InEdgeIt(Invalid) { }
360        /// This constructor sets the iterator to first incoming edge.
361   
362        /// This constructor set the iterator to the first incoming edge of
363        /// the node.
364        InEdgeIt(const StaticGraph&, const Node&) { }
365        /// Edge -> InEdgeIt conversion
366
367        /// Sets the iterator to the value of the trivial iterator \c e.
368        /// This feature necessitates that each time we
369        /// iterate the edge-set, the iteration order is the same.
370        InEdgeIt(const StaticGraph&, const Edge&) { }
371        /// Next incoming edge
372
373        /// Assign the iterator to the next inedge of the corresponding node.
374        ///
375        InEdgeIt& operator++() { return *this; }
376      };
377      /// This iterator goes through each edge.
378
379      /// This iterator goes through each edge of a graph.
380      /// Its usage is quite simple, for example you can count the number
381      /// of edges in a graph \c g of type \c Graph as follows:
382      /// \code
383      /// int count=0;
384      /// for(Graph::EdgeIt e(g); e!=INVALID; ++e) ++count;
385      /// \endcode
386      class EdgeIt : public Edge {
387      public:
388        /// Default constructor
389
390        /// @warning The default constructor sets the iterator
391        /// to an undefined value.
392        EdgeIt() { }
393        /// Copy constructor.
394
395        /// Copy constructor.
396        ///
397        EdgeIt(const EdgeIt& e) : Edge(e) { }
398        /// Initialize the iterator to be invalid.
399
400        /// Initialize the iterator to be invalid.
401        ///
402        EdgeIt(Invalid) { }
403        /// This constructor sets the iterator to the first edge.
404   
405        /// This constructor sets the iterator to the first edge of \c g.
406        ///@param g the graph
407        EdgeIt(const StaticGraph&) { }
408        /// Edge -> EdgeIt conversion
409
410        /// Sets the iterator to the value of the trivial iterator \c e.
411        /// This feature necessitates that each time we
412        /// iterate the edge-set, the iteration order is the same.
413        EdgeIt(const StaticGraph&, const Edge&) { }
414        ///Next edge
415       
416        /// Assign the iterator to the next edge.
417        EdgeIt& operator++() { return *this; }
418      };
419      ///Gives back the target node of an edge.
420
421      ///Gives back the target node of an edge.
422      ///
423      Node target(Edge) const { return INVALID; }
424      ///Gives back the source node of an edge.
425
426      ///Gives back the source node of an edge.
427      ///
428      Node source(Edge) const { return INVALID; }
429
430      /// Gives back the first Node in the iterating order.
431     
432      /// Gives back the first Node in the iterating order.
433      ///     
434      void first(Node&) const {}
435
436      /// Gives back the next Node in the iterating order.
437     
438      /// Gives back the next Node in the iterating order.
439      ///     
440      void next(Node&) const {}
441
442      /// Gives back the first Edge in the iterating order.
443     
444      /// Gives back the first Edge in the iterating order.
445      ///     
446      void first(Edge&) const {}
447      /// Gives back the next Edge in the iterating order.
448     
449      /// Gives back the next Edge in the iterating order.
450      ///     
451      void next(Edge&) const {}
452
453
454      /// Gives back the first of the Edges point to the given Node.
455     
456      /// Gives back the first of the Edges point to the given Node.
457      ///     
458      void firstIn(Edge&, const Node&) const {}
459
460      /// Gives back the next of the Edges points to the given Node.
461
462
463      /// Gives back the next of the Edges points to the given Node.
464      ///
465      void nextIn(Edge&) const {}
466
467      /// Gives back the first of the Edges start from the given Node.
468     
469      /// Gives back the first of the Edges start from the given Node.
470      ///     
471      void firstOut(Edge&, const Node&) const {}
472
473      /// Gives back the next of the Edges start from the given Node.
474     
475      /// Gives back the next of the Edges start from the given Node.
476      ///     
477      void nextOut(Edge&) const {}
478
479      /// \brief The base node of the iterator.
480      ///
481      /// Gives back the base node of the iterator.
482      Node baseNode(const InEdgeIt&) const { return INVALID; }
483
484      /// \brief The running node of the iterator.
485      ///
486      /// Gives back the running node of the iterator.
487      Node runningNode(const InEdgeIt&) const { return INVALID; }
488
489      /// \brief The base node of the iterator.
490      ///
491      /// Gives back the base node of the iterator.
492      Node baseNode(const OutEdgeIt&) const { return INVALID; }
493
494      /// \brief The running node of the iterator.
495      ///
496      /// Gives back the running node of the iterator.
497      Node runningNode(const OutEdgeIt&) const { return INVALID; }
498      /// Read write map of the nodes to type \c T.
499
500      /// \ingroup concept
501      /// ReadWrite map of the nodes to type \c T.
502      /// \sa Reference
503      /// \warning Making maps that can handle bool type (NodeMap<bool>)
504      /// needs some extra attention!
505      template<class T>
506      class NodeMap : public ReadWriteMap< Node, T >
507      {
508      public:
509
510        ///\e
511        NodeMap(const StaticGraph&) { }
512        ///\e
513        NodeMap(const StaticGraph&, T) { }
514
515        ///Copy constructor
516        NodeMap(const NodeMap& nm) : ReadWriteMap< Node, T >(nm) { }
517        ///Assignment operator
518        NodeMap& operator=(const NodeMap&) { return *this; }
519        // \todo fix this concept
520      };
521
522      /// Read write map of the edges to type \c T.
523
524      /// \ingroup concept
525      ///Reference map of the edges to type \c T.
526      /// \sa Reference
527      /// \warning Making maps that can handle bool type (EdgeMap<bool>)
528      /// needs some extra attention!
529      template<class T>
530      class EdgeMap : public ReadWriteMap<Edge,T>
531      {
532      public:
533
534        ///\e
535        EdgeMap(const StaticGraph&) { }
536        ///\e
537        EdgeMap(const StaticGraph&, T) { }
538        ///Copy constructor
539        EdgeMap(const EdgeMap& em) : ReadWriteMap<Edge,T>(em) { }
540        ///Assignment operator
541        EdgeMap& operator=(const EdgeMap&) { return *this; }
542        // \todo fix this concept   
543      };
544
545      template <typename _Graph>
546      struct Constraints : public _StaticGraph::Constraints<_Graph> {};
547
548    };
549
550    /// An empty non-static graph class.
551   
552    /// This class provides everything that \ref StaticGraph does.
553    /// Additionally it enables building graphs from scratch.
554    class ExtendableGraph : public StaticGraph
555    {
556    public:
557      /// Defalult constructor.
558
559      /// Defalult constructor.
560      ///
561      ExtendableGraph() { }
562      ///Add a new node to the graph.
563
564      /// \return the new node.
565      ///
566      Node addNode() { return INVALID; }
567      ///Add a new edge to the graph.
568
569      ///Add a new edge to the graph with source node \c s
570      ///and target node \c t.
571      ///\return the new edge.
572      Edge addEdge(Node, Node) { return INVALID; }
573   
574      /// Resets the graph.
575
576      /// This function deletes all edges and nodes of the graph.
577      /// It also frees the memory allocated to store them.
578      /// \todo It might belong to \ref ErasableGraph.
579      void clear() { }
580
581      template <typename _Graph>
582      struct Constraints : public _ExtendableGraph::Constraints<_Graph> {};
583
584    };
585
586    /// An empty erasable graph class.
587 
588    /// This class is an extension of \ref ExtendableGraph. It makes it
589    /// possible to erase edges or nodes.
590    class ErasableGraph : public ExtendableGraph
591    {
592    public:
593      /// Defalult constructor.
594
595      /// Defalult constructor.
596      ///
597      ErasableGraph() { }
598      /// Deletes a node.
599
600      /// Deletes node \c n node.
601      ///
602      void erase(Node) { }
603      /// Deletes an edge.
604
605      /// Deletes edge \c e edge.
606      ///
607      void erase(Edge) { }
608
609      template <typename _Graph>
610      struct Constraints : public _ErasableGraph::Constraints<_Graph> {};
611
612    };
613
614   
615    /************* New GraphBase stuff **************/
616
617
618//     /// A minimal GraphBase concept
619
620//     /// This class describes a minimal concept which can be extended to a
621//     /// full-featured graph with \ref GraphFactory.
622//     class GraphBase {
623//     public:
624
625//       GraphBase() {}
626
627//       /// \bug Should we demand that Node and Edge be subclasses of the
628//       /// Graph class???
629
630//       typedef GraphItem<'n'> Node;
631//       typedef GraphItem<'e'> Edge;
632
633// //       class Node : public BaseGraphItem<'n'> {};
634// //       class Edge : public BaseGraphItem<'e'> {};
635
636//       // Graph operation
637//       void firstNode(Node &n) const { }
638//       void firstEdge(Edge &e) const { }
639
640//       void firstOutEdge(Edge &e, Node) const { }
641//       void firstInEdge(Edge &e, Node) const { }
642
643//       void nextNode(Node &n) const { }
644//       void nextEdge(Edge &e) const { }
645
646
647//       // Question: isn't it reasonable if this methods have a Node
648//       // parameter? Like this:
649//       // Edge& nextOut(Edge &e, Node) const { return e; }
650//       void nextOutEdge(Edge &e) const { }
651//       void nextInEdge(Edge &e) const { }
652
653//       Node target(Edge) const { return Node(); }
654//       Node source(Edge) const { return Node(); }
655     
656
657//       // Do we need id, nodeNum, edgeNum and co. in this basic graphbase
658//       // concept?
659
660
661//       // Maps.
662//       //
663//       // We need a special slimer concept which does not provide maps (it
664//       // wouldn't be strictly slimer, cause for map-factory id() & friends
665//       // a required...)
666
667//       template<typename T>
668//       class NodeMap : public GraphMap<GraphBase, Node, T> {};
669
670//       template<typename T>
671//       class EdgeMap : public GraphMap<GraphBase, Node, T> {};
672//     };
673
674    // @}
675  } //namespace concept 
676} //namespace lemon
677
678
679
680#endif // LEMON_CONCEPT_GRAPH_H
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