lemon-main: lemon/concepts/digraph.h@1e5da3fc4fbc

     1 /* -*- mode: C++; indent-tabs-mode: nil; -*-

     2  *

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

     4  *

     5  * Copyright (C) 2003-2013

     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_CONCEPTS_DIGRAPH_H

    20 #define LEMON_CONCEPTS_DIGRAPH_H

    22 ///\ingroup graph_concepts

    23 ///\file

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

    26 #include <lemon/core.h>

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

    28 #include <lemon/concept_check.h>

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

    31 namespace lemon {

    32   namespace concepts {

    34     /// \ingroup graph_concepts

    35     ///

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

    37     ///

    38     /// This class describes the common interface of all directed

    39     /// graphs (digraphs).

    40     ///

    41     /// Like all concept classes, it only provides an interface

    42     /// without any sensible implementation. So any general algorithm for

    43     /// directed graphs should compile with this class, but it will not

    44     /// run properly, of course.

    45     /// An actual digraph implementation like \ref ListDigraph or

    46     /// \ref SmartDigraph may have additional functionality.

    47     ///

    48     /// \sa Graph

    49     class Digraph {

    50     private:

    51       /// Diraphs are \e not copy constructible. Use DigraphCopy instead.

    52       Digraph(const Digraph &) {}

    53       /// \brief Assignment of a digraph to another one is \e not allowed.

    54       /// Use DigraphCopy instead.

    55       void operator=(const Digraph &) {}

    57     public:

    58       /// Default constructor.

    59       Digraph() { }

    61       /// The node type of the digraph

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

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

    65       /// thus they convert to this type.

    66       class Node {

    67       public:

    68         /// Default constructor

    70         /// Default constructor.

    71         /// \warning It sets the object to an undefined value.

    72         Node() { }

    73         /// Copy constructor.

    75         /// Copy constructor.

    76         ///

    77         Node(const Node&) { }

    79         /// %Invalid constructor \& conversion.

    81         /// Initializes the object to be invalid.

    82         /// \sa Invalid for more details.

    83         Node(Invalid) { }

    84         /// Equality operator

    86         /// Equality operator.

    87         ///

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

    89         /// same object or both are \c INVALID.

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

    92         /// Inequality operator

    94         /// Inequality operator.

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

    97         /// Artificial ordering operator.

    99         /// Artificial ordering operator.

   100         ///

   101         /// \note This operator only has to define some strict ordering of

   102         /// the nodes; this order has nothing to do with the iteration

   103         /// ordering of the nodes.

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

   105       };

   107       /// Iterator class for the nodes.

   109       /// This iterator goes through each node of the digraph.

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

   111       /// of nodes in a digraph \c g of type \c %Digraph like this:

   112       ///\code

   113       /// int count=0;

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

   115       ///\endcode

   116       class NodeIt : public Node {

   117       public:

   118         /// Default constructor

   120         /// Default constructor.

   121         /// \warning It sets the iterator to an undefined value.

   122         NodeIt() { }

   123         /// Copy constructor.

   125         /// Copy constructor.

   126         ///

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

   128         /// %Invalid constructor \& conversion.

   130         /// Initializes the iterator to be invalid.

   131         /// \sa Invalid for more details.

   132         NodeIt(Invalid) { }

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

   135         /// Sets the iterator to the first node of the given digraph.

   136         ///

   137         explicit NodeIt(const Digraph&) { }

   138         /// Sets the iterator to the given node.

   140         /// Sets the iterator to the given node of the given digraph.

   141         ///

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

   143         /// Next node.

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

   146         ///

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

   148       };

   151       /// The arc type of the digraph

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

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

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

   156       class Arc {

   157       public:

   158         /// Default constructor

   160         /// Default constructor.

   161         /// \warning It sets the object to an undefined value.

   162         Arc() { }

   163         /// Copy constructor.

   165         /// Copy constructor.

   166         ///

   167         Arc(const Arc&) { }

   168         /// %Invalid constructor \& conversion.

   170         /// Initializes the object to be invalid.

   171         /// \sa Invalid for more details.

   172         Arc(Invalid) { }

   173         /// Equality operator

   175         /// Equality operator.

   176         ///

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

   178         /// same object or both are \c INVALID.

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

   180         /// Inequality operator

   182         /// Inequality operator.

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

   185         /// Artificial ordering operator.

   187         /// Artificial ordering operator.

   188         ///

   189         /// \note This operator only has to define some strict ordering of

   190         /// the arcs; this order has nothing to do with the iteration

   191         /// ordering of the arcs.

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

   193       };

   195       /// Iterator class for the outgoing arcs of a node.

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

   198       /// of a digraph.

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

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

   201       /// in a digraph \c g of type \c %Digraph as follows.

   202       ///\code

   203       /// int count=0;

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

   205       ///\endcode

   206       class OutArcIt : public Arc {

   207       public:

   208         /// Default constructor

   210         /// Default constructor.

   211         /// \warning It sets the iterator to an undefined value.

   212         OutArcIt() { }

   213         /// Copy constructor.

   215         /// Copy constructor.

   216         ///

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

   218         /// %Invalid constructor \& conversion.

   220         /// Initializes the iterator to be invalid.

   221         /// \sa Invalid for more details.

   222         OutArcIt(Invalid) { }

   223         /// Sets the iterator to the first outgoing arc.

   225         /// Sets the iterator to the first outgoing arc of the given node.

   226         ///

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

   228         /// Sets the iterator to the given arc.

   230         /// Sets the iterator to the given arc of the given digraph.

   231         ///

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

   233         /// Next outgoing arc

   235         /// Assign the iterator to the next

   236         /// outgoing arc of the corresponding node.

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

   238       };

   240       /// Iterator class for the incoming arcs of a node.

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

   243       /// of a digraph.

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

   245       /// of incoming arcs of a node \c n

   246       /// in a digraph \c g of type \c %Digraph as follows.

   247       ///\code

   248       /// int count=0;

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

   250       ///\endcode

   251       class InArcIt : public Arc {

   252       public:

   253         /// Default constructor

   255         /// Default constructor.

   256         /// \warning It sets the iterator to an undefined value.

   257         InArcIt() { }

   258         /// Copy constructor.

   260         /// Copy constructor.

   261         ///

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

   263         /// %Invalid constructor \& conversion.

   265         /// Initializes the iterator to be invalid.

   266         /// \sa Invalid for more details.

   267         InArcIt(Invalid) { }

   268         /// Sets the iterator to the first incoming arc.

   270         /// Sets the iterator to the first incoming arc of the given node.

   271         ///

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

   273         /// Sets the iterator to the given arc.

   275         /// Sets the iterator to the given arc of the given digraph.

   276         ///

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

   278         /// Next incoming arc

   280         /// Assign the iterator to the next

   281         /// incoming arc of the corresponding node.

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

   283       };

   285       /// Iterator class for the arcs.

   287       /// This iterator goes through each arc of the digraph.

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

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

   290       ///\code

   291       /// int count=0;

   292       /// for(Digraph::ArcIt a(g); a!=INVALID; ++a) ++count;

   293       ///\endcode

   294       class ArcIt : public Arc {

   295       public:

   296         /// Default constructor

   298         /// Default constructor.

   299         /// \warning It sets the iterator to an undefined value.

   300         ArcIt() { }

   301         /// Copy constructor.

   303         /// Copy constructor.

   304         ///

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

   306         /// %Invalid constructor \& conversion.

   308         /// Initializes the iterator to be invalid.

   309         /// \sa Invalid for more details.

   310         ArcIt(Invalid) { }

   311         /// Sets the iterator to the first arc.

   313         /// Sets the iterator to the first arc of the given digraph.

   314         ///

   315         explicit ArcIt(const Digraph& g) {

   316           ::lemon::ignore_unused_variable_warning(g);

   317         }

   318         /// Sets the iterator to the given arc.

   320         /// Sets the iterator to the given arc of the given digraph.

   321         ///

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

   323         /// Next arc

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

   326         ///

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

   328       };

   330       /// \brief The source node of the arc.

   331       ///

   332       /// Returns the source node of the given arc.

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

   335       /// \brief The target node of the arc.

   336       ///

   337       /// Returns the target node of the given arc.

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

   340       /// \brief The ID of the node.

   341       ///

   342       /// Returns the ID of the given node.

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

   345       /// \brief The ID of the arc.

   346       ///

   347       /// Returns the ID of the given arc.

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

   350       /// \brief The node with the given ID.

   351       ///

   352       /// Returns the node with the given ID.

   353       /// \pre The argument should be a valid node ID in the digraph.

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

   356       /// \brief The arc with the given ID.

   357       ///

   358       /// Returns the arc with the given ID.

   359       /// \pre The argument should be a valid arc ID in the digraph.

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

   362       /// \brief An upper bound on the node IDs.

   363       ///

   364       /// Returns an upper bound on the node IDs.

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

   367       /// \brief An upper bound on the arc IDs.

   368       ///

   369       /// Returns an upper bound on the arc IDs.

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

   372       void first(Node&) const {}

   373       void next(Node&) const {}

   375       void first(Arc&) const {}

   376       void next(Arc&) const {}

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

   380       void nextIn(Arc&) const {}

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

   383       void nextOut(Arc&) const {}

   385       // The second parameter is dummy.

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

   387       // The second parameter is dummy.

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

   390       // Dummy parameter.

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

   392       // Dummy parameter.

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

   395       /// \brief The opposite node on the arc.

   396       ///

   397       /// Returns the opposite node on the given arc.

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

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

   401       ///

   402       /// Returns the base node of the given outgoing arc iterator

   403       /// (i.e. the source node of the corresponding arc).

   404       Node baseNode(OutArcIt) const { return INVALID; }

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

   407       ///

   408       /// Returns the running node of the given outgoing arc iterator

   409       /// (i.e. the target node of the corresponding arc).

   410       Node runningNode(OutArcIt) const { return INVALID; }

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

   413       ///

   414       /// Returns the base node of the given incoming arc iterator

   415       /// (i.e. the target node of the corresponding arc).

   416       Node baseNode(InArcIt) const { return INVALID; }

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

   419       ///

   420       /// Returns the running node of the given incoming arc iterator

   421       /// (i.e. the source node of the corresponding arc).

   422       Node runningNode(InArcIt) const { return INVALID; }

   424       /// \brief Standard graph map type for the nodes.

   425       ///

   426       /// Standard graph map type for the nodes.

   427       /// It conforms to the ReferenceMap concept.

   428       template<class T>

   429       class NodeMap : public ReferenceMap<Node, T, T&, const T&> {

   430       public:

   432         /// Constructor

   433         explicit NodeMap(const Digraph&) { }

   434         /// Constructor with given initial value

   435         NodeMap(const Digraph&, T) { }

   437       private:

   438         ///Copy constructor

   439         NodeMap(const NodeMap& nm) :

   440           ReferenceMap<Node, T, T&, const T&>(nm) { }

   441         ///Assignment operator

   442         template <typename CMap>

   443         NodeMap& operator=(const CMap&) {

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

   445           return *this;

   446         }

   447       };

   449       /// \brief Standard graph map type for the arcs.

   450       ///

   451       /// Standard graph map type for the arcs.

   452       /// It conforms to the ReferenceMap concept.

   453       template<class T>

   454       class ArcMap : public ReferenceMap<Arc, T, T&, const T&> {

   455       public:

   457         /// Constructor

   458         explicit ArcMap(const Digraph&) { }

   459         /// Constructor with given initial value

   460         ArcMap(const Digraph&, T) { }

   462       private:

   463         ///Copy constructor

   464         ArcMap(const ArcMap& em) :

   465           ReferenceMap<Arc, T, T&, const T&>(em) { }

   466         ///Assignment operator

   467         template <typename CMap>

   468         ArcMap& operator=(const CMap&) {

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

   470           return *this;

   471         }

   472       };

   474       template <typename _Digraph>

   475       struct Constraints {

   476         void constraints() {

   477           checkConcept<BaseDigraphComponent, _Digraph>();

   478           checkConcept<IterableDigraphComponent<>, _Digraph>();

   479           checkConcept<IDableDigraphComponent<>, _Digraph>();

   480           checkConcept<MappableDigraphComponent<>, _Digraph>();

   481         }

   482       };

   484     };

   486   } //namespace concepts

   487 } //namespace lemon

   491 #endif

author	Balazs Dezso <deba@google.com>
	Tue, 15 May 2018 14:16:35 +0200
changeset 1181	1e5da3fc4fbc
parent 1092	dceba191c00d
child 1130	0759d974de81
permissions	-rw-r--r--