lemon-0.x: lemon/concept/graph.h@269a0dcee70b

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

     2  *

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

     4  *

     5  * Copyright (C) 2003-2006

     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_GRAPH_H

    20 #define LEMON_CONCEPT_GRAPH_H

    22 ///\ingroup graph_concepts

    23 ///\file

    24 ///\brief Declaration of Graph.

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

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

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

    29 #include <lemon/concept_check.h>

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

    32 namespace lemon {

    33   namespace concept {

    35     /// \addtogroup graph_concepts

    36     /// @{

    38     /// The directed graph concept

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

    41     /// immutable directed graphs.

    42     ///

    43     /// Note that actual graph implementation like @ref ListGraph or

    44     /// @ref SmartGraph may have several additional functionality.

    45     ///

    46     /// \sa concept

    47     class Graph {

    48     private:

    49       ///Graphs are \e not copy constructible. Use GraphCopy() instead.

    51       ///Graphs are \e not copy constructible. Use GraphCopy() instead.

    52       ///

    53       Graph(const Graph &) {};

    54       ///\brief Assignment of \ref Graph "Graph"s to another ones are

    55       ///\e not allowed. Use GraphCopy() instead.

    57       ///Assignment of \ref Graph "Graph"s to another ones are

    58       ///\e not allowed.  Use GraphCopy() instead.

    60       void operator=(const Graph &) {}

    61     public:

    62       ///\e

    64       /// Defalult constructor.

    66       /// Defalult constructor.

    67       ///

    68       Graph() { }

    69       /// Class for identifying a node of the graph

    71       /// This class identifies a node of the graph. It also serves

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

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

    74       class Node {

    75       public:

    76         /// Default constructor

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

    79         /// to an undefined value.

    80         Node() { }

    81         /// Copy constructor.

    83         /// Copy constructor.

    84         ///

    85         Node(const Node&) { }

    87         /// Invalid constructor \& conversion.

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

    90         /// \sa Invalid for more details.

    91         Node(Invalid) { }

    92         /// Equality operator

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

    95         /// same object or both are invalid.

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

    98         /// Inequality operator

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

   101         ///

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

   104 	/// Artificial ordering operator.

   106 	/// To allow the use of graph descriptors as key type in std::map or

   107 	/// similar associative container we require this.

   108 	///

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

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

   111 	/// ordering of the items.

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

   114       };

   116       /// This iterator goes through each node.

   118       /// This iterator goes through each node.

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

   120       /// of nodes in graph \c g of type \c Graph like this:

   121       ///\code

   122       /// int count=0;

   123       /// for (Graph::NodeIt n(g); n!=INVALID; ++n) ++count;

   124       ///\endcode

   125       class NodeIt : public Node {

   126       public:

   127         /// Default constructor

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

   130         /// to an undefined value.

   131         NodeIt() { }

   132         /// Copy constructor.

   134         /// Copy constructor.

   135         ///

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

   137         /// Invalid constructor \& conversion.

   139         /// Initialize the iterator to be invalid.

   140         /// \sa Invalid for more details.

   141         NodeIt(Invalid) { }

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

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

   145         ///

   146         NodeIt(const Graph&) { }

   147         /// Node -> NodeIt conversion.

   149         /// Sets the iterator to the node of \c the graph pointed by

   150 	/// the trivial iterator.

   151         /// This feature necessitates that each time we

   152         /// iterate the edge-set, the iteration order is the same.

   153         NodeIt(const Graph&, const Node&) { }

   154         /// Next node.

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

   157         ///

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

   159       };

   162       /// Class for identifying an edge of the graph

   164       /// This class identifies an edge of the graph. It also serves

   165       /// as a base class of the edge iterators,

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

   167       class Edge {

   168       public:

   169         /// Default constructor

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

   172         /// to an undefined value.

   173         Edge() { }

   174         /// Copy constructor.

   176         /// Copy constructor.

   177         ///

   178         Edge(const Edge&) { }

   179         /// Initialize the iterator to be invalid.

   181         /// Initialize the iterator to be invalid.

   182         ///

   183         Edge(Invalid) { }

   184         /// Equality operator

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

   187         /// same object or both are invalid.

   188         bool operator==(Edge) const { return true; }

   189         /// Inequality operator

   191         /// \sa operator==(Edge n)

   192         ///

   193         bool operator!=(Edge) const { return true; }

   195 	/// Artificial ordering operator.

   197 	/// To allow the use of graph descriptors as key type in std::map or

   198 	/// similar associative container we require this.

   199 	///

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

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

   202 	/// ordering of the items.

   203 	bool operator<(Edge) const { return false; }

   204       };

   206       /// This iterator goes trough the outgoing edges of a node.

   208       /// This iterator goes trough the \e outgoing edges of a certain node

   209       /// of a graph.

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

   211       /// of outgoing edges of a node \c n

   212       /// in graph \c g of type \c Graph as follows.

   213       ///\code

   214       /// int count=0;

   215       /// for (Graph::OutEdgeIt e(g, n); e!=INVALID; ++e) ++count;

   216       ///\endcode

   218       class OutEdgeIt : public Edge {

   219       public:

   220         /// Default constructor

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

   223         /// to an undefined value.

   224         OutEdgeIt() { }

   225         /// Copy constructor.

   227         /// Copy constructor.

   228         ///

   229         OutEdgeIt(const OutEdgeIt& e) : Edge(e) { }

   230         /// Initialize the iterator to be invalid.

   232         /// Initialize the iterator to be invalid.

   233         ///

   234         OutEdgeIt(Invalid) { }

   235         /// This constructor sets the iterator to the first outgoing edge.

   237         /// This constructor sets the iterator to the first outgoing edge of

   238         /// the node.

   239         OutEdgeIt(const Graph&, const Node&) { }

   240         /// Edge -> OutEdgeIt conversion

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

   243 	/// This feature necessitates that each time we

   244         /// iterate the edge-set, the iteration order is the same.

   245         OutEdgeIt(const Graph&, const Edge&) { }

   246         ///Next outgoing edge

   248         /// Assign the iterator to the next

   249         /// outgoing edge of the corresponding node.

   250         OutEdgeIt& operator++() { return *this; }

   251       };

   253       /// This iterator goes trough the incoming edges of a node.

   255       /// This iterator goes trough the \e incoming edges of a certain node

   256       /// of a graph.

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

   258       /// of outgoing edges of a node \c n

   259       /// in graph \c g of type \c Graph as follows.

   260       ///\code

   261       /// int count=0;

   262       /// for(Graph::InEdgeIt e(g, n); e!=INVALID; ++e) ++count;

   263       ///\endcode

   265       class InEdgeIt : public Edge {

   266       public:

   267         /// Default constructor

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

   270         /// to an undefined value.

   271         InEdgeIt() { }

   272         /// Copy constructor.

   274         /// Copy constructor.

   275         ///

   276         InEdgeIt(const InEdgeIt& e) : Edge(e) { }

   277         /// Initialize the iterator to be invalid.

   279         /// Initialize the iterator to be invalid.

   280         ///

   281         InEdgeIt(Invalid) { }

   282         /// This constructor sets the iterator to first incoming edge.

   284         /// This constructor set the iterator to the first incoming edge of

   285         /// the node.

   286         InEdgeIt(const Graph&, const Node&) { }

   287         /// Edge -> InEdgeIt conversion

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

   290         /// This feature necessitates that each time we

   291         /// iterate the edge-set, the iteration order is the same.

   292         InEdgeIt(const Graph&, const Edge&) { }

   293         /// Next incoming edge

   295         /// Assign the iterator to the next inedge of the corresponding node.

   296         ///

   297         InEdgeIt& operator++() { return *this; }

   298       };

   299       /// This iterator goes through each edge.

   301       /// This iterator goes through each edge of a graph.

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

   303       /// of edges in a graph \c g of type \c Graph as follows:

   304       ///\code

   305       /// int count=0;

   306       /// for(Graph::EdgeIt e(g); e!=INVALID; ++e) ++count;

   307       ///\endcode

   308       class EdgeIt : public Edge {

   309       public:

   310         /// Default constructor

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

   313         /// to an undefined value.

   314         EdgeIt() { }

   315         /// Copy constructor.

   317         /// Copy constructor.

   318         ///

   319         EdgeIt(const EdgeIt& e) : Edge(e) { }

   320         /// Initialize the iterator to be invalid.

   322         /// Initialize the iterator to be invalid.

   323         ///

   324         EdgeIt(Invalid) { }

   325         /// This constructor sets the iterator to the first edge.

   327         /// This constructor sets the iterator to the first edge of \c g.

   328         ///@param g the graph

   329         EdgeIt(const Graph& g) { ignore_unused_variable_warning(g); }

   330         /// Edge -> EdgeIt conversion

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

   333         /// This feature necessitates that each time we

   334         /// iterate the edge-set, the iteration order is the same.

   335         EdgeIt(const Graph&, const Edge&) { }

   336         ///Next edge

   338         /// Assign the iterator to the next edge.

   339         EdgeIt& operator++() { return *this; }

   340       };

   341       ///Gives back the target node of an edge.

   343       ///Gives back the target node of an edge.

   344       ///

   345       Node target(Edge) const { return INVALID; }

   346       ///Gives back the source node of an edge.

   348       ///Gives back the source node of an edge.

   349       ///

   350       Node source(Edge) const { return INVALID; }

   352       void first(Node&) const {}

   353       void next(Node&) const {}

   355       void first(Edge&) const {}

   356       void next(Edge&) const {}

   359       void firstIn(Edge&, const Node&) const {}

   360       void nextIn(Edge&) const {}

   362       void firstOut(Edge&, const Node&) const {}

   363       void nextOut(Edge&) const {}

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

   366       ///

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

   368       /// It is always the target of the pointed edge.

   369       Node baseNode(const InEdgeIt&) const { return INVALID; }

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

   372       ///

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

   374       /// It is always the source of the pointed edge.

   375       Node runningNode(const InEdgeIt&) const { return INVALID; }

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

   378       ///

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

   380       /// It is always the source of the pointed edge.

   381       Node baseNode(const OutEdgeIt&) const { return INVALID; }

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

   384       ///

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

   386       /// It is always the target of the pointed edge.

   387       Node runningNode(const OutEdgeIt&) const { return INVALID; }

   389       /// \brief The opposite node on the given edge.

   390       ///

   391       /// Gives back the opposite node on the given edge.

   392       Node oppositeNode(const Node&, const Edge&) const { return INVALID; }

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

   395       ///

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

   397       /// \sa Reference

   398       template<class T>

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

   400       public:

   402         ///\e

   403         NodeMap(const Graph&) { }

   404         ///\e

   405         NodeMap(const Graph&, T) { }

   407         ///Copy constructor

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

   409         ///Assignment operator

   410         template <typename CMap>

   411         NodeMap& operator=(const CMap&) {

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

   413           return *this;

   414         }

   415       };

   417       /// \brief Read write map of the edges to type \c T.

   418       ///

   419       /// Reference map of the edges to type \c T.

   420       /// \sa Reference

   421       template<class T>

   422       class EdgeMap : public ReadWriteMap<Edge,T> {

   423       public:

   425         ///\e

   426         EdgeMap(const Graph&) { }

   427         ///\e

   428         EdgeMap(const Graph&, T) { }

   429         ///Copy constructor

   430         EdgeMap(const EdgeMap& em) : ReadWriteMap<Edge,T>(em) { }

   431         ///Assignment operator

   432         template <typename CMap>

   433         EdgeMap& operator=(const CMap&) {

   434           checkConcept<ReadMap<Edge, T>, CMap>();

   435           return *this;

   436         }

   437       };

   439       template <typename RGraph>

   440       struct Constraints {

   441         void constraints() {

   442           checkConcept<IterableGraphComponent<>, Graph>();

   443           checkConcept<MappableGraphComponent<>, Graph>();

   444         }

   445       };

   447     };

   449     // @}

   450   } //namespace concept

   451 } //namespace lemon

   455 #endif // LEMON_CONCEPT_GRAPH_H

author	deba
	Tue, 17 Oct 2006 10:50:57 +0000
changeset 2247	269a0dcee70b
parent 2134	914602e294be
permissions	-rw-r--r--