lemon-main: lemon/concepts/digraph.h@761622e5ed4c

     1 /* -*- C++ -*-

     2  *

     3  * This file is a part of LEMON, a generic C++ optimization library

     4  *

     5  * Copyright (C) 2003-2007

     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).

     8  *

     9  * Permission to use, modify and distribute this software is granted

    10  * provided that this copyright notice appears in all copies. For

    11  * precise terms see the accompanying LICENSE file.

    12  *

    13  * This software is provided "AS IS" with no warranty of any kind,

    14  * express or implied, and with no claim as to its suitability for any

    15  * purpose.

    16  *

    17  */

    19 #ifndef LEMON_CONCEPT_DIGRAPH_H

    20 #define LEMON_CONCEPT_DIGRAPH_H

    22 ///\ingroup graph_concepts

    23 ///\file

    24 ///\brief The concept of directed graphs.

    26 #include <lemon/bits/invalid.h>

    27 #include <lemon/bits/utility.h>

    28 #include <lemon/concepts/maps.h>

    29 #include <lemon/concept_check.h>

    30 #include <lemon/concepts/graph_components.h>

    32 namespace lemon {

    33   namespace concepts {

    35     /// \ingroup graph_concepts

    36     ///

    37     /// \brief Class describing the concept of directed graphs.

    38     ///

    39     /// This class describes the \ref concept "concept" of the

    40     /// immutable directed digraphs.

    41     ///

    42     /// Note that actual digraph implementation like @ref ListDigraph or

    43     /// @ref SmartDigraph may have several additional functionality.

    44     ///

    45     /// \sa concept

    46     class Digraph {

    47     private:

    48       ///Digraphs are \e not copy constructible. Use DigraphCopy() instead.

    50       ///Digraphs are \e not copy constructible. Use DigraphCopy() instead.

    51       ///

    52       Digraph(const Digraph &) {};

    53       ///\brief Assignment of \ref Digraph "Digraph"s to another ones are

    54       ///\e not allowed. Use DigraphCopy() instead.

    56       ///Assignment of \ref Digraph "Digraph"s to another ones are

    57       ///\e not allowed.  Use DigraphCopy() instead.

    59       void operator=(const Digraph &) {}

    60     public:

    61       ///\e

    63       /// Defalult constructor.

    65       /// Defalult constructor.

    66       ///

    67       Digraph() { }

    68       /// Class for identifying a node of the digraph

    70       /// This class identifies a node of the digraph. It also serves

    71       /// as a base class of the node iterators,

    72       /// thus they will convert to this type.

    73       class Node {

    74       public:

    75         /// Default constructor

    77         /// @warning The default constructor sets the iterator

    78         /// to an undefined value.

    79         Node() { }

    80         /// Copy constructor.

    82         /// Copy constructor.

    83         ///

    84         Node(const Node&) { }

    86         /// Invalid constructor \& conversion.

    88         /// This constructor initializes the iterator to be invalid.

    89         /// \sa Invalid for more details.

    90         Node(Invalid) { }

    91         /// Equality operator

    93         /// Two iterators are equal if and only if they point to the

    94         /// same object or both are invalid.

    95         bool operator==(Node) const { return true; }

    97         /// Inequality operator

    99         /// \sa operator==(Node n)

   100         ///

   101         bool operator!=(Node) const { return true; }

   103 	/// Artificial ordering operator.

   105 	/// To allow the use of digraph descriptors as key type in std::map or

   106 	/// similar associative container we require this.

   107 	///

   108 	/// \note This operator only have to define some strict ordering of

   109 	/// the items; this order has nothing to do with the iteration

   110 	/// ordering of the items.

   111 	bool operator<(Node) const { return false; }

   113       };

   115       /// This iterator goes through each node.

   117       /// This iterator goes through each node.

   118       /// Its usage is quite simple, for example you can count the number

   119       /// of nodes in digraph \c g of type \c Digraph like this:

   120       ///\code

   121       /// int count=0;

   122       /// for (Digraph::NodeIt n(g); n!=INVALID; ++n) ++count;

   123       ///\endcode

   124       class NodeIt : public Node {

   125       public:

   126         /// Default constructor

   128         /// @warning The default constructor sets the iterator

   129         /// to an undefined value.

   130         NodeIt() { }

   131         /// Copy constructor.

   133         /// Copy constructor.

   134         ///

   135         NodeIt(const NodeIt& n) : Node(n) { }

   136         /// Invalid constructor \& conversion.

   138         /// Initialize the iterator to be invalid.

   139         /// \sa Invalid for more details.

   140         NodeIt(Invalid) { }

   141         /// Sets the iterator to the first node.

   143         /// Sets the iterator to the first node of \c g.

   144         ///

   145         NodeIt(const Digraph&) { }

   146         /// Node -> NodeIt conversion.

   148         /// Sets the iterator to the node of \c the digraph pointed by

   149 	/// the trivial iterator.

   150         /// This feature necessitates that each time we

   151         /// iterate the arc-set, the iteration order is the same.

   152         NodeIt(const Digraph&, const Node&) { }

   153         /// Next node.

   155         /// Assign the iterator to the next node.

   156         ///

   157         NodeIt& operator++() { return *this; }

   158       };

   161       /// Class for identifying an arc of the digraph

   163       /// This class identifies an arc of the digraph. It also serves

   164       /// as a base class of the arc iterators,

   165       /// thus they will convert to this type.

   166       class Arc {

   167       public:

   168         /// Default constructor

   170         /// @warning The default constructor sets the iterator

   171         /// to an undefined value.

   172         Arc() { }

   173         /// Copy constructor.

   175         /// Copy constructor.

   176         ///

   177         Arc(const Arc&) { }

   178         /// Initialize the iterator to be invalid.

   180         /// Initialize the iterator to be invalid.

   181         ///

   182         Arc(Invalid) { }

   183         /// Equality operator

   185         /// Two iterators are equal if and only if they point to the

   186         /// same object or both are invalid.

   187         bool operator==(Arc) const { return true; }

   188         /// Inequality operator

   190         /// \sa operator==(Arc n)

   191         ///

   192         bool operator!=(Arc) const { return true; }

   194 	/// Artificial ordering operator.

   196 	/// To allow the use of digraph descriptors as key type in std::map or

   197 	/// similar associative container we require this.

   198 	///

   199 	/// \note This operator only have to define some strict ordering of

   200 	/// the items; this order has nothing to do with the iteration

   201 	/// ordering of the items.

   202 	bool operator<(Arc) const { return false; }

   203       };

   205       /// This iterator goes trough the outgoing arcs of a node.

   207       /// This iterator goes trough the \e outgoing arcs of a certain node

   208       /// of a digraph.

   209       /// Its usage is quite simple, for example you can count the number

   210       /// of outgoing arcs of a node \c n

   211       /// in digraph \c g of type \c Digraph as follows.

   212       ///\code

   213       /// int count=0;

   214       /// for (Digraph::OutArcIt e(g, n); e!=INVALID; ++e) ++count;

   215       ///\endcode

   217       class OutArcIt : public Arc {

   218       public:

   219         /// Default constructor

   221         /// @warning The default constructor sets the iterator

   222         /// to an undefined value.

   223         OutArcIt() { }

   224         /// Copy constructor.

   226         /// Copy constructor.

   227         ///

   228         OutArcIt(const OutArcIt& e) : Arc(e) { }

   229         /// Initialize the iterator to be invalid.

   231         /// Initialize the iterator to be invalid.

   232         ///

   233         OutArcIt(Invalid) { }

   234         /// This constructor sets the iterator to the first outgoing arc.

   236         /// This constructor sets the iterator to the first outgoing arc of

   237         /// the node.

   238         OutArcIt(const Digraph&, const Node&) { }

   239         /// Arc -> OutArcIt conversion

   241         /// Sets the iterator to the value of the trivial iterator.

   242 	/// This feature necessitates that each time we

   243         /// iterate the arc-set, the iteration order is the same.

   244         OutArcIt(const Digraph&, const Arc&) { }

   245         ///Next outgoing arc

   247         /// Assign the iterator to the next

   248         /// outgoing arc of the corresponding node.

   249         OutArcIt& operator++() { return *this; }

   250       };

   252       /// This iterator goes trough the incoming arcs of a node.

   254       /// This iterator goes trough the \e incoming arcs of a certain node

   255       /// of a digraph.

   256       /// Its usage is quite simple, for example you can count the number

   257       /// of outgoing arcs of a node \c n

   258       /// in digraph \c g of type \c Digraph as follows.

   259       ///\code

   260       /// int count=0;

   261       /// for(Digraph::InArcIt e(g, n); e!=INVALID; ++e) ++count;

   262       ///\endcode

   264       class InArcIt : public Arc {

   265       public:

   266         /// Default constructor

   268         /// @warning The default constructor sets the iterator

   269         /// to an undefined value.

   270         InArcIt() { }

   271         /// Copy constructor.

   273         /// Copy constructor.

   274         ///

   275         InArcIt(const InArcIt& e) : Arc(e) { }

   276         /// Initialize the iterator to be invalid.

   278         /// Initialize the iterator to be invalid.

   279         ///

   280         InArcIt(Invalid) { }

   281         /// This constructor sets the iterator to first incoming arc.

   283         /// This constructor set the iterator to the first incoming arc of

   284         /// the node.

   285         InArcIt(const Digraph&, const Node&) { }

   286         /// Arc -> InArcIt conversion

   288         /// Sets the iterator to the value of the trivial iterator \c e.

   289         /// This feature necessitates that each time we

   290         /// iterate the arc-set, the iteration order is the same.

   291         InArcIt(const Digraph&, const Arc&) { }

   292         /// Next incoming arc

   294         /// Assign the iterator to the next inarc of the corresponding node.

   295         ///

   296         InArcIt& operator++() { return *this; }

   297       };

   298       /// This iterator goes through each arc.

   300       /// This iterator goes through each arc of a digraph.

   301       /// Its usage is quite simple, for example you can count the number

   302       /// of arcs in a digraph \c g of type \c Digraph as follows:

   303       ///\code

   304       /// int count=0;

   305       /// for(Digraph::ArcIt e(g); e!=INVALID; ++e) ++count;

   306       ///\endcode

   307       class ArcIt : public Arc {

   308       public:

   309         /// Default constructor

   311         /// @warning The default constructor sets the iterator

   312         /// to an undefined value.

   313         ArcIt() { }

   314         /// Copy constructor.

   316         /// Copy constructor.

   317         ///

   318         ArcIt(const ArcIt& e) : Arc(e) { }

   319         /// Initialize the iterator to be invalid.

   321         /// Initialize the iterator to be invalid.

   322         ///

   323         ArcIt(Invalid) { }

   324         /// This constructor sets the iterator to the first arc.

   326         /// This constructor sets the iterator to the first arc of \c g.

   327         ///@param g the digraph

   328         ArcIt(const Digraph& g) { ignore_unused_variable_warning(g); }

   329         /// Arc -> ArcIt conversion

   331         /// Sets the iterator to the value of the trivial iterator \c e.

   332         /// This feature necessitates that each time we

   333         /// iterate the arc-set, the iteration order is the same.

   334         ArcIt(const Digraph&, const Arc&) { }

   335         ///Next arc

   337         /// Assign the iterator to the next arc.

   338         ArcIt& operator++() { return *this; }

   339       };

   340       ///Gives back the target node of an arc.

   342       ///Gives back the target node of an arc.

   343       ///

   344       Node target(Arc) const { return INVALID; }

   345       ///Gives back the source node of an arc.

   347       ///Gives back the source node of an arc.

   348       ///

   349       Node source(Arc) const { return INVALID; }

   351       /// \brief Returns the ID of the node.

   352       int id(Node) const { return -1; }

   354       /// \brief Returns the ID of the arc.

   355       int id(Arc) const { return -1; }

   357       /// \brief Returns the node with the given ID.

   358       ///

   359       /// \pre The argument should be a valid node ID in the graph.

   360       Node nodeFromId(int) const { return INVALID; }

   362       /// \brief Returns the arc with the given ID.

   363       ///

   364       /// \pre The argument should be a valid arc ID in the graph.

   365       Arc arcFromId(int) const { return INVALID; }

   367       /// \brief Returns an upper bound on the node IDs.

   368       int maxNodeId() const { return -1; }

   370       /// \brief Returns an upper bound on the arc IDs.

   371       int maxArcId() const { return -1; }

   373       void first(Node&) const {}

   374       void next(Node&) const {}

   376       void first(Arc&) const {}

   377       void next(Arc&) const {}

   380       void firstIn(Arc&, const Node&) const {}

   381       void nextIn(Arc&) const {}

   383       void firstOut(Arc&, const Node&) const {}

   384       void nextOut(Arc&) const {}

   386       // The second parameter is dummy.

   387       Node fromId(int, Node) const { return INVALID; }

   388       // The second parameter is dummy.

   389       Arc fromId(int, Arc) const { return INVALID; }

   391       // Dummy parameter.

   392       int maxId(Node) const { return -1; }

   393       // Dummy parameter.

   394       int maxId(Arc) const { return -1; }

   396       /// \brief The base node of the iterator.

   397       ///

   398       /// Gives back the base node of the iterator.

   399       /// It is always the target of the pointed arc.

   400       Node baseNode(const InArcIt&) const { return INVALID; }

   402       /// \brief The running node of the iterator.

   403       ///

   404       /// Gives back the running node of the iterator.

   405       /// It is always the source of the pointed arc.

   406       Node runningNode(const InArcIt&) const { return INVALID; }

   408       /// \brief The base node of the iterator.

   409       ///

   410       /// Gives back the base node of the iterator.

   411       /// It is always the source of the pointed arc.

   412       Node baseNode(const OutArcIt&) const { return INVALID; }

   414       /// \brief The running node of the iterator.

   415       ///

   416       /// Gives back the running node of the iterator.

   417       /// It is always the target of the pointed arc.

   418       Node runningNode(const OutArcIt&) const { return INVALID; }

   420       /// \brief The opposite node on the given arc.

   421       ///

   422       /// Gives back the opposite node on the given arc.

   423       Node oppositeNode(const Node&, const Arc&) const { return INVALID; }

   425       /// \brief Read write map of the nodes to type \c T.

   426       ///

   427       /// ReadWrite map of the nodes to type \c T.

   428       /// \sa Reference

   429       template<class T>

   430       class NodeMap : public ReadWriteMap< Node, T > {

   431       public:

   433         ///\e

   434         NodeMap(const Digraph&) { }

   435         ///\e

   436         NodeMap(const Digraph&, T) { }

   438         ///Copy constructor

   439         NodeMap(const NodeMap& nm) : ReadWriteMap< Node, T >(nm) { }

   440         ///Assignment operator

   441         template <typename CMap>

   442         NodeMap& operator=(const CMap&) {

   443           checkConcept<ReadMap<Node, T>, CMap>();

   444           return *this;

   445         }

   446       };

   448       /// \brief Read write map of the arcs to type \c T.

   449       ///

   450       /// Reference map of the arcs to type \c T.

   451       /// \sa Reference

   452       template<class T>

   453       class ArcMap : public ReadWriteMap<Arc,T> {

   454       public:

   456         ///\e

   457         ArcMap(const Digraph&) { }

   458         ///\e

   459         ArcMap(const Digraph&, T) { }

   460         ///Copy constructor

   461         ArcMap(const ArcMap& em) : ReadWriteMap<Arc,T>(em) { }

   462         ///Assignment operator

   463         template <typename CMap>

   464         ArcMap& operator=(const CMap&) {

   465           checkConcept<ReadMap<Arc, T>, CMap>();

   466           return *this;

   467         }

   468       };

   470       template <typename RDigraph>

   471       struct Constraints {

   472         void constraints() {

   473           checkConcept<IterableDigraphComponent<>, Digraph>();

   474 	  checkConcept<IDableDigraphComponent<>, Digraph>();

   475           checkConcept<MappableDigraphComponent<>, Digraph>();

   476         }

   477       };

   479     };

   481   } //namespace concepts

   482 } //namespace lemon

   486 #endif // LEMON_CONCEPT_DIGRAPH_H

author	Akos Ladanyi <ladanyi@tmit.bme.hu>
	Mon, 04 Feb 2008 13:32:36 +0100
changeset 64	761622e5ed4c
parent 57	c1acf0018c0a
child 107	31a2e6d28f61
permissions	-rw-r--r--