lemon/bits/vector_map.h
author Akos Ladanyi <ladanyi@tmit.bme.hu>
Sun, 13 Apr 2008 13:22:52 +0200
changeset 141 96f81c791f0c
parent 57 c1acf0018c0a
child 157 2ccc1afc2c52
permissions -rw-r--r--
CMake based build system
     1 /* -*- C++ -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library
     4  *
     5  * Copyright (C) 2003-2008
     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  */
    18 
    19 #ifndef LEMON_BITS_VECTOR_MAP_H
    20 #define LEMON_BITS_VECTOR_MAP_H
    21 
    22 #include <vector>
    23 #include <algorithm>
    24 
    25 #include <lemon/bits/traits.h>
    26 #include <lemon/bits/utility.h>
    27 
    28 #include <lemon/bits/alteration_notifier.h>
    29 
    30 #include <lemon/concept_check.h>
    31 #include <lemon/concepts/maps.h>
    32 
    33 ///\ingroup graphbits
    34 ///
    35 ///\file
    36 ///\brief Vector based graph maps.
    37 namespace lemon {
    38 
    39   /// \ingroup graphbits
    40   ///
    41   /// \brief Graph map based on the std::vector storage.
    42   ///
    43   /// The VectorMap template class is graph map structure what
    44   /// automatically updates the map when a key is added to or erased from
    45   /// the map. This map type uses the std::vector to store the values.
    46   ///
    47   /// \param Notifier The AlterationNotifier that will notify this map.
    48   /// \param Item The item type of the graph items.
    49   /// \param Value The value type of the map.
    50   /// 
    51   /// \author Balazs Dezso  	
    52   template <typename _Graph, typename _Item, typename _Value>
    53   class VectorMap 
    54     : public ItemSetTraits<_Graph, _Item>::ItemNotifier::ObserverBase {
    55   private:
    56 		
    57     /// The container type of the map.
    58     typedef std::vector<_Value> Container;	
    59 
    60   public:
    61 
    62     /// The graph type of the map. 
    63     typedef _Graph Graph;
    64     /// The item type of the map.
    65     typedef _Item Item;
    66     /// The reference map tag.
    67     typedef True ReferenceMapTag;
    68 
    69     /// The key type of the map.
    70     typedef _Item Key;
    71     /// The value type of the map.
    72     typedef _Value Value;
    73 
    74     /// The notifier type.
    75     typedef typename ItemSetTraits<_Graph, _Item>::ItemNotifier Notifier;
    76 
    77     /// The map type.
    78     typedef VectorMap Map;
    79     /// The base class of the map.
    80     typedef typename Notifier::ObserverBase Parent;
    81 
    82     /// The reference type of the map;
    83     typedef typename Container::reference Reference;
    84     /// The const reference type of the map;
    85     typedef typename Container::const_reference ConstReference;
    86 
    87 
    88     /// \brief Constructor to attach the new map into the notifier.
    89     ///
    90     /// It constructs a map and attachs it into the notifier.
    91     /// It adds all the items of the graph to the map.
    92     VectorMap(const Graph& graph) {
    93       Parent::attach(graph.notifier(Item()));
    94       container.resize(Parent::notifier()->maxId() + 1);
    95     }
    96 
    97     /// \brief Constructor uses given value to initialize the map. 
    98     ///
    99     /// It constructs a map uses a given value to initialize the map. 
   100     /// It adds all the items of the graph to the map.
   101     VectorMap(const Graph& graph, const Value& value) {
   102       Parent::attach(graph.notifier(Item()));
   103       container.resize(Parent::notifier()->maxId() + 1, value);
   104     }
   105 
   106     /// \brief Copy constructor
   107     ///
   108     /// Copy constructor.
   109     VectorMap(const VectorMap& _copy) : Parent() {
   110       if (_copy.attached()) {
   111 	Parent::attach(*_copy.notifier());
   112 	container = _copy.container;
   113       }
   114     }
   115 
   116     /// \brief Assign operator.
   117     ///
   118     /// This operator assigns for each item in the map the
   119     /// value mapped to the same item in the copied map.  
   120     /// The parameter map should be indiced with the same
   121     /// itemset because this assign operator does not change
   122     /// the container of the map. 
   123     VectorMap& operator=(const VectorMap& cmap) {
   124       return operator=<VectorMap>(cmap);
   125     }
   126 
   127 
   128     /// \brief Template assign operator.
   129     ///
   130     /// The given parameter should be conform to the ReadMap
   131     /// concecpt and could be indiced by the current item set of
   132     /// the NodeMap. In this case the value for each item
   133     /// is assigned by the value of the given ReadMap. 
   134     template <typename CMap>
   135     VectorMap& operator=(const CMap& cmap) {
   136       checkConcept<concepts::ReadMap<Key, _Value>, CMap>();
   137       const typename Parent::Notifier* nf = Parent::notifier();
   138       Item it;
   139       for (nf->first(it); it != INVALID; nf->next(it)) {
   140         set(it, cmap[it]);
   141       }
   142       return *this;
   143     }
   144     
   145   public:
   146 
   147     /// \brief The subcript operator.
   148     ///
   149     /// The subscript operator. The map can be subscripted by the
   150     /// actual items of the graph.      
   151     Reference operator[](const Key& key) {
   152       return container[Parent::notifier()->id(key)];
   153     } 
   154 		
   155     /// \brief The const subcript operator.
   156     ///
   157     /// The const subscript operator. The map can be subscripted by the
   158     /// actual items of the graph. 
   159     ConstReference operator[](const Key& key) const {
   160       return container[Parent::notifier()->id(key)];
   161     }
   162 
   163 
   164     /// \brief The setter function of the map.
   165     ///
   166     /// It the same as operator[](key) = value expression.
   167     void set(const Key& key, const Value& value) {
   168       (*this)[key] = value;
   169     }
   170 
   171   protected:
   172 
   173     /// \brief Adds a new key to the map.
   174     ///		
   175     /// It adds a new key to the map. It called by the observer notifier
   176     /// and it overrides the add() member function of the observer base.     
   177     virtual void add(const Key& key) {
   178       int id = Parent::notifier()->id(key);
   179       if (id >= int(container.size())) {
   180 	container.resize(id + 1);
   181       }
   182     }
   183 
   184     /// \brief Adds more new keys to the map.
   185     ///		
   186     /// It adds more new keys to the map. It called by the observer notifier
   187     /// and it overrides the add() member function of the observer base.     
   188     virtual void add(const std::vector<Key>& keys) {
   189       int max = container.size() - 1;
   190       for (int i = 0; i < int(keys.size()); ++i) {
   191         int id = Parent::notifier()->id(keys[i]);
   192         if (id >= max) {
   193           max = id;
   194         }
   195       }
   196       container.resize(max + 1);
   197     }
   198 
   199     /// \brief Erase a key from the map.
   200     ///
   201     /// Erase a key from the map. It called by the observer notifier
   202     /// and it overrides the erase() member function of the observer base.     
   203     virtual void erase(const Key& key) {
   204       container[Parent::notifier()->id(key)] = Value();
   205     }
   206 
   207     /// \brief Erase more keys from the map.
   208     ///
   209     /// Erase more keys from the map. It called by the observer notifier
   210     /// and it overrides the erase() member function of the observer base.     
   211     virtual void erase(const std::vector<Key>& keys) {
   212       for (int i = 0; i < int(keys.size()); ++i) {
   213 	container[Parent::notifier()->id(keys[i])] = Value();
   214       }
   215     }
   216     
   217     /// \brief Buildes the map.
   218     ///	
   219     /// It buildes the map. It called by the observer notifier
   220     /// and it overrides the build() member function of the observer base.
   221     virtual void build() { 
   222       int size = Parent::notifier()->maxId() + 1;
   223       container.reserve(size);
   224       container.resize(size);
   225     }
   226 
   227     /// \brief Clear the map.
   228     ///
   229     /// It erase all items from the map. It called by the observer notifier
   230     /// and it overrides the clear() member function of the observer base.     
   231     virtual void clear() { 
   232       container.clear();
   233     }
   234     
   235   private:
   236 		
   237     Container container;
   238 
   239   };
   240 
   241 }
   242 
   243 #endif