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2 * lemon/concept/graph.h - Part of LEMON, a generic C++ optimization library
4 * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
5 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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.
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
17 #ifndef LEMON_CONCEPT_GRAPH_H
18 #define LEMON_CONCEPT_GRAPH_H
20 ///\ingroup graph_concepts
22 ///\brief Declaration of Graph.
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>
34 /**************** The full-featured graph concepts ****************/
37 /// \brief Modular static graph class.
39 /// It should be the same as the \c StaticGraph class.
41 : virtual public BaseGraphComponent,
42 public IterableGraphComponent, public MappableGraphComponent {
48 typedef False UndirTag;
50 typedef BaseGraphComponent::Node Node;
51 typedef BaseGraphComponent::Edge Edge;
53 template <typename _Graph>
56 checkConcept<IterableGraphComponent, _Graph>();
57 checkConcept<MappableGraphComponent, _Graph>();
62 /// \brief Modular extendable graph class.
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 {
69 typedef BaseGraphComponent::Node Node;
70 typedef BaseGraphComponent::Edge Edge;
72 template <typename _Graph>
75 checkConcept<_StaticGraph, _Graph >();
76 checkConcept<ExtendableGraphComponent, _Graph >();
77 checkConcept<ClearableGraphComponent, _Graph >();
82 /// \brief Modular erasable graph class.
84 /// It should be the same as the \c ErasableGraph class.
86 : virtual public BaseGraphComponent, public _ExtendableGraph,
87 public ErasableGraphComponent {
89 typedef BaseGraphComponent::Node Node;
90 typedef BaseGraphComponent::Edge Edge;
92 template <typename _Graph>
95 checkConcept<_ExtendableGraph, _Graph >();
96 checkConcept<ErasableGraphComponent, _Graph >();
101 /// \addtogroup graph_concepts
104 /// An empty static graph class.
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.
112 /// It can be used for checking the interface compatibility,
113 /// or it can serve as a skeleton of a new graph structure.
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.
120 /// \todo A pages describing the concept of concept description would
127 ///\todo undocumented
129 typedef False UndirTag;
131 /// Defalult constructor.
133 /// Defalult constructor.
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) { }
142 /// The base type of node iterators,
143 /// or in other words, the trivial node iterator.
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.
151 /// Default constructor
153 /// @warning The default constructor sets the iterator
154 /// to an undefined value.
156 /// Copy constructor.
158 /// Copy constructor.
160 Node(const Node&) { }
162 /// Invalid constructor \& conversion.
164 /// This constructor initializes the iterator to be invalid.
165 /// \sa Invalid for more details.
167 /// Equality operator
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; }
173 /// Inequality operator
175 /// \sa operator==(Node n)
177 bool operator!=(Node) const { return true; }
179 /// Artificial ordering operator.
181 /// To allow the use of graph descriptors as key type in std::map or
182 /// similar associative container we require this.
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.
188 /// \bug This is a technical requirement. Do we really need this?
189 bool operator<(Node) const { return false; }
193 /// This iterator goes through each node.
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:
200 /// for (Graph::NodeIt n(g); n!=INVALID; ++n) ++count;
202 class NodeIt : public Node {
204 /// Default constructor
206 /// @warning The default constructor sets the iterator
207 /// to an undefined value.
209 /// Copy constructor.
211 /// Copy constructor.
213 NodeIt(const NodeIt& n) : Node(n) { }
214 /// Invalid constructor \& conversion.
216 /// Initialize the iterator to be invalid.
217 /// \sa Invalid for more details.
219 /// Sets the iterator to the first node.
221 /// Sets the iterator to the first node of \c g.
223 NodeIt(const StaticGraph&) { }
224 /// Node -> NodeIt conversion.
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&) { }
233 /// Assign the iterator to the next node.
235 NodeIt& operator++() { return *this; }
239 /// The base type of the edge iterators.
241 /// The base type of the edge iterators.
245 /// Default constructor
247 /// @warning The default constructor sets the iterator
248 /// to an undefined value.
250 /// Copy constructor.
252 /// Copy constructor.
254 Edge(const Edge&) { }
255 /// Initialize the iterator to be invalid.
257 /// Initialize the iterator to be invalid.
260 /// Equality operator
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
267 /// \sa operator==(Edge n)
269 bool operator!=(Edge) const { return true; }
271 /// Artificial ordering operator.
273 /// To allow the use of graph descriptors as key type in std::map or
274 /// similar associative container we require this.
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.
280 /// \bug This is a technical requirement. Do we really need this?
281 bool operator<(Edge) const { return false; }
284 /// This iterator goes trough the outgoing edges of a node.
286 /// This iterator goes trough the \e outgoing edges of a certain node
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.
293 /// for (Graph::OutEdgeIt e(g, n); e!=INVALID; ++e) ++count;
296 class OutEdgeIt : public Edge {
298 /// Default constructor
300 /// @warning The default constructor sets the iterator
301 /// to an undefined value.
303 /// Copy constructor.
305 /// Copy constructor.
307 OutEdgeIt(const OutEdgeIt& e) : Edge(e) { }
308 /// Initialize the iterator to be invalid.
310 /// Initialize the iterator to be invalid.
312 OutEdgeIt(Invalid) { }
313 /// This constructor sets the iterator to the first outgoing edge.
315 /// This constructor sets the iterator to the first outgoing edge of
317 OutEdgeIt(const StaticGraph&, const Node&) { }
318 /// Edge -> OutEdgeIt conversion
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
326 /// Assign the iterator to the next
327 /// outgoing edge of the corresponding node.
328 OutEdgeIt& operator++() { return *this; }
331 /// This iterator goes trough the incoming edges of a node.
333 /// This iterator goes trough the \e incoming edges of a certain node
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.
340 /// for(Graph::InEdgeIt e(g, n); e!=INVALID; ++e) ++count;
343 class InEdgeIt : public Edge {
345 /// Default constructor
347 /// @warning The default constructor sets the iterator
348 /// to an undefined value.
350 /// Copy constructor.
352 /// Copy constructor.
354 InEdgeIt(const InEdgeIt& e) : Edge(e) { }
355 /// Initialize the iterator to be invalid.
357 /// Initialize the iterator to be invalid.
359 InEdgeIt(Invalid) { }
360 /// This constructor sets the iterator to first incoming edge.
362 /// This constructor set the iterator to the first incoming edge of
364 InEdgeIt(const StaticGraph&, const Node&) { }
365 /// Edge -> InEdgeIt conversion
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
373 /// Assign the iterator to the next inedge of the corresponding node.
375 InEdgeIt& operator++() { return *this; }
377 /// This iterator goes through each edge.
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:
384 /// for(Graph::EdgeIt e(g); e!=INVALID; ++e) ++count;
386 class EdgeIt : public Edge {
388 /// Default constructor
390 /// @warning The default constructor sets the iterator
391 /// to an undefined value.
393 /// Copy constructor.
395 /// Copy constructor.
397 EdgeIt(const EdgeIt& e) : Edge(e) { }
398 /// Initialize the iterator to be invalid.
400 /// Initialize the iterator to be invalid.
403 /// This constructor sets the iterator to the first edge.
405 /// This constructor sets the iterator to the first edge of \c g.
406 ///@param g the graph
407 EdgeIt(const StaticGraph& g) { ignore_unused_variable_warning(g); }
408 /// Edge -> EdgeIt conversion
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&) { }
416 /// Assign the iterator to the next edge.
417 EdgeIt& operator++() { return *this; }
419 ///Gives back the target node of an edge.
421 ///Gives back the target node of an edge.
423 Node target(Edge) const { return INVALID; }
424 ///Gives back the source node of an edge.
426 ///Gives back the source node of an edge.
428 Node source(Edge) const { return INVALID; }
430 // /// Gives back the first Node in the iterating order.
432 // /// Gives back the first Node in the iterating order.
434 void first(Node&) const {}
436 // /// Gives back the next Node in the iterating order.
438 // /// Gives back the next Node in the iterating order.
440 void next(Node&) const {}
442 // /// Gives back the first Edge in the iterating order.
444 // /// Gives back the first Edge in the iterating order.
446 void first(Edge&) const {}
447 // /// Gives back the next Edge in the iterating order.
449 // /// Gives back the next Edge in the iterating order.
451 void next(Edge&) const {}
454 // /// Gives back the first of the Edges point to the given Node.
456 // /// Gives back the first of the Edges point to the given Node.
458 void firstIn(Edge&, const Node&) const {}
460 // /// Gives back the next of the Edges points to the given Node.
463 // /// Gives back the next of the Edges points to the given Node.
465 void nextIn(Edge&) const {}
467 // /// Gives back the first of the Edges start from the given Node.
469 // /// Gives back the first of the Edges start from the given Node.
471 void firstOut(Edge&, const Node&) const {}
473 // /// Gives back the next of the Edges start from the given Node.
475 // /// Gives back the next of the Edges start from the given Node.
477 void nextOut(Edge&) const {}
479 /// \brief The base node of the iterator.
481 /// Gives back the base node of the iterator.
482 /// It is always the target of the pointed edge.
483 Node baseNode(const InEdgeIt&) const { return INVALID; }
485 /// \brief The running node of the iterator.
487 /// Gives back the running node of the iterator.
488 /// It is always the source of the pointed edge.
489 Node runningNode(const InEdgeIt&) const { return INVALID; }
491 /// \brief The base node of the iterator.
493 /// Gives back the base node of the iterator.
494 /// It is always the source of the pointed edge.
495 Node baseNode(const OutEdgeIt&) const { return INVALID; }
497 /// \brief The running node of the iterator.
499 /// Gives back the running node of the iterator.
500 /// It is always the target of the pointed edge.
501 Node runningNode(const OutEdgeIt&) const { return INVALID; }
503 /// \brief The opposite node on the given edge.
505 /// Gives back the opposite node on the given edge.
506 Node oppositeNode(const Node&, const Edge&) const { return INVALID; }
508 /// \brief Read write map of the nodes to type \c T.
510 /// ReadWrite map of the nodes to type \c T.
512 /// \warning Making maps that can handle bool type (NodeMap<bool>)
513 /// needs some extra attention!
514 /// \todo Wrong documentation
516 class NodeMap : public ReadWriteMap< Node, T >
521 NodeMap(const StaticGraph&) { }
523 NodeMap(const StaticGraph&, T) { }
526 NodeMap(const NodeMap& nm) : ReadWriteMap< Node, T >(nm) { }
527 ///Assignment operator
528 NodeMap& operator=(const NodeMap&) { return *this; }
529 // \todo fix this concept
532 /// \brief Read write map of the edges to type \c T.
534 /// Reference map of the edges to type \c T.
536 /// \warning Making maps that can handle bool type (EdgeMap<bool>)
537 /// needs some extra attention!
538 /// \todo Wrong documentation
540 class EdgeMap : public ReadWriteMap<Edge,T>
545 EdgeMap(const StaticGraph&) { }
547 EdgeMap(const StaticGraph&, T) { }
549 EdgeMap(const EdgeMap& em) : ReadWriteMap<Edge,T>(em) { }
550 ///Assignment operator
551 EdgeMap& operator=(const EdgeMap&) { return *this; }
552 // \todo fix this concept
555 template <typename _Graph>
556 struct Constraints : public _StaticGraph::Constraints<_Graph> {};
560 /// An empty non-static graph class.
562 /// This class provides everything that \ref StaticGraph does.
563 /// Additionally it enables building graphs from scratch.
564 class ExtendableGraph : public StaticGraph
567 /// Defalult constructor.
569 /// Defalult constructor.
571 ExtendableGraph() { }
572 ///Add a new node to the graph.
574 /// \return the new node.
576 Node addNode() { return INVALID; }
577 ///Add a new edge to the graph.
579 ///Add a new edge to the graph with source node \c s
580 ///and target node \c t.
581 ///\return the new edge.
582 Edge addEdge(Node, Node) { return INVALID; }
584 /// Resets the graph.
586 /// This function deletes all edges and nodes of the graph.
587 /// It also frees the memory allocated to store them.
588 /// \todo It might belong to \ref ErasableGraph.
591 template <typename _Graph>
592 struct Constraints : public _ExtendableGraph::Constraints<_Graph> {};
596 /// An empty erasable graph class.
598 /// This class is an extension of \ref ExtendableGraph. It makes it
599 /// possible to erase edges or nodes.
600 class ErasableGraph : public ExtendableGraph
603 /// Defalult constructor.
605 /// Defalult constructor.
610 /// Deletes node \c n node.
615 /// Deletes edge \c e edge.
619 template <typename _Graph>
620 struct Constraints : public _ErasableGraph::Constraints<_Graph> {};
625 } //namespace concept
630 #endif // LEMON_CONCEPT_GRAPH_H