lemon-0.x: lemon/iterable_maps.h@cb082cdf3667

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

     2  * lemon/iterable_maps.h - Part of LEMON, a generic C++ optimization library

     3  *

     4  * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

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

     6  *

     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.

    10  *

    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

    13  * purpose.

    14  *

    15  */

    17 #include <lemon/traits.h>

    18 #include <lemon/invalid.h>

    19 #include <vector>

    20 #include <limits>

    22 ///\ingroup maps

    23 ///\file

    24 ///\brief Maps that makes it possible to iterate through the keys having

    25 ///a certain value

    26 ///

    27 ///

    30 namespace lemon {

    32   ///\todo This is only a static map!

    33   ///\todo Undocumented.

    34   ///\param BaseMap is an interger map.

    35   template<class BaseMap>

    36   class IterableBoolMap

    37   {

    38   public:

    40     typedef typename BaseMap::Key Key;

    41     typedef bool Value;

    43     friend class RefType;

    44     friend class FalseIt;

    45     friend class TrueIt;

    47   private:

    48     BaseMap &cref;

    49     std::vector<Key> vals;

    50     int sep;           //map[e] is true <=> cref[e]>=sep

    52     bool isTrue(Key k) {return cref[k]>=sep;}

    53     void swap(Key k, int s)

    54     {

    55       int ti=cref[k];

    56       Key tk=vals[s];

    57       cref[k]=s; vals[s]=k;

    58       cref[tk]=ti; vals[ti]=tk;

    59     }

    61     void setTrue(Key k) { if(cref[k]<sep) { sep--; swap(k,sep); } }

    62     void setFalse(Key k) { if(cref[k]>=sep) { swap(k,sep); sep++; } }

    64   public:

    65     ///\e

    66     void set(Key k,Value v) { if(v) setTrue(k); else setFalse(k);}

    67     ///Number of \c true items in the map

    69     ///Returns the number of \c true values in the map.

    70     ///This is a constant time operation.

    71     int countTrue() { return vals.size()-sep; }

    72     ///Number of \c false items in the map

    74     ///Returns the number of \c false values in the map.

    75     ///This is a constant time operation.

    76     int countFalse() { return sep; }

    78     ///\e

    79     class FalseIt

    80     {

    81       const IterableBoolMap &M;

    82       int i;

    83     public:

    84       ///\e

    85       explicit FalseIt(const IterableBoolMap &_M) : M(_M), i(0) { }

    86       ///\e

    87       FalseIt(Invalid)

    88 	: M(*((IterableBoolMap*)(0))), i(std::numeric_limits<int>::max()) { }

    89       ///\e

    90       FalseIt &operator++() { ++i; return *this;}

    91       ///\e

    92       operator Key() const { return i<M.sep ? M.vals[i] : INVALID; }

    93       ///\e

    94       bool operator !=(Invalid) const { return i<M.sep; }

    95       ///\e

    96       bool operator ==(Invalid) const { return i>=M.sep; }

    97     };

    98     ///\e

    99     class TrueIt

   100     {

   101       const IterableBoolMap &M;

   102       int i;

   103     public:

   104       ///\e

   105       explicit TrueIt(const IterableBoolMap &_M)

   106 	: M(_M), i(M.vals.size()-1) { }

   107       ///\e

   108       TrueIt(Invalid)

   109 	: M(*((IterableBoolMap*)(0))), i(-1) { }

   110       ///\e

   111       TrueIt &operator++() { --i; return *this;}

   112       ///\e

   113       operator Key() const { return i>=M.sep ? M.vals[i] : INVALID; }

   114       ///\e

   115       bool operator !=(Invalid) const { return i>=M.sep; }

   116       ///\e

   117       bool operator ==(Invalid) const { return i<M.sep; }

   118     };

   120     ///\e

   121     class RefType

   122     {

   123       IterableBoolMap &M;

   124       Key k;

   125     public:

   126       RefType(IterableBoolMap &_M,Key _k) : M(_M), k(_k) { }

   128       operator Value() const

   129       {

   130 	return M.isTrue(k);

   131       }

   132       Value operator = (Value v) const { M.set(k,v); return v; }

   133     };

   135   public:

   136     explicit IterableBoolMap(BaseMap &_m,bool init=false) : cref(_m)

   137     {

   138       sep=0;

   139       for(typename BaseMap::MapIt i(cref);i!=INVALID; ++i) {

   140 	i.set(sep);

   141 	vals.push_back(i);

   142 	sep++;

   143       }

   144       if(init) sep=0;

   145     }

   146     ///\e

   147     RefType operator[] (Key k) { return RefType(*this,k);}

   148     ///\e

   149     Value operator[] (Key k) const { return isTrue(k);}

   150   };

   155   /// \addtogroup graph_maps

   156   /// @{

   158   /// Iterable bool NodeMap

   160   /// This map can be used in the same way

   161   /// as the standard NodeMap<bool> of the

   162   /// given graph \c Graph.

   163   /// In addition, this class provides two iterators called \ref TrueIt

   164   /// and \ref FalseIt to iterate through the "true" and "false" nodes.

   165   template <class Graph>

   166   class IterableBoolNodeMap

   167   {

   168     typename Graph::template NodeMap<int> cmap;

   170   public:

   172     typedef IterableBoolMap<typename Graph::template NodeMap<int> > BimType;

   173     BimType imap;

   176     typedef typename BimType::RefType RefType;

   177     typedef typename Graph::Node Key;

   178     typedef bool Value;

   180     friend class FalseIt;

   181     friend class TrueIt;

   183     ///\e

   184     IterableBoolNodeMap(const Graph &g,bool b=false) : cmap(g), imap(cmap,b) {}

   186   public:

   187     ///\e

   188     void set(Key k, bool v) { imap.set(k,v);}

   189     ///Number of \c true items in the map

   191     ///Returns the number of \c true values in the map.

   192     ///This is a constant time operation.

   193     int countTrue() { return imap.countTrue(); }

   194     ///Number of \c false items in the map

   196     ///Returns the number of \c false values in the map.

   197     ///This is a constant time operation.

   198     int countFalse() { return imap.countFalse(); }

   199 #ifdef DOXYGEN

   200     ///\e

   201     bool &operator[](Key k) { return imap[k];}

   202     ///\e

   203     const bool &operator[](Key k) const { return imap[k];}

   204 #else

   205     Value operator[](Key k) const { return imap[k];}

   206     RefType operator[](Key k) { return imap[k];}

   207 #endif

   208     ///Iterator for the "false" nodes

   209     class FalseIt : public BimType::FalseIt

   210     {

   211     public:

   212       ///\e

   213       explicit FalseIt(const IterableBoolNodeMap &m)

   214 	: BimType::FalseIt(m.imap) { }

   215       ///\e

   216       FalseIt(Invalid i) : BimType::FalseIt(i) { }

   217     };

   218     ///Iterator for the "true" nodes

   219     class TrueIt : public BimType::TrueIt

   220     {

   221     public:

   222       ///\e

   223       explicit TrueIt(const IterableBoolNodeMap &m)

   224 	: BimType::TrueIt(m.imap) { }

   225       ///\e

   226       TrueIt(Invalid i) : BimType::TrueIt(i) { }

   227     };

   228   };

   230   /// Iterable bool EdgeMap

   232   /// This map can be used in the same way

   233   /// as the standard EdgeMap<bool> of the

   234   /// given graph \c Graph.

   235   /// In addition, this class provides two iterators called \ref TrueIt

   236   /// and \ref FalseIt to iterate through the "true" and "false" edges.

   237   template <class Graph>

   238   class IterableBoolEdgeMap

   239   {

   240     typename Graph::template EdgeMap<int> cmap;

   242   public:

   244     typedef IterableBoolMap<typename Graph::template EdgeMap<int> > BimType;

   245     BimType imap;

   248     typedef typename BimType::RefType RefType;

   249     typedef typename Graph::Edge Key;

   250     typedef bool Value;

   252     friend class FalseIt;

   253     friend class TrueIt;

   255     ///\e

   256     IterableBoolEdgeMap(const Graph &g,bool b=false) : cmap(g), imap(cmap,b) {}

   258   public:

   259     ///\e

   260     void set(Key k, bool v) { imap.set(k,v);}

   261     ///Returns the number of \c true values in the map.

   262     ///This is a constant time operation.

   263     int countTrue() { return imap.countTrue(); }

   264     ///Number of \c false items in the map

   266     ///Returns the number of \c false values in the map.

   267     ///This is a constant time operation.

   268     int countFalse() { return imap.countFalse(); }

   269 #ifdef DOXYGEN

   270     ///\e

   271     bool &operator[](Key k) { return imap[k];}

   272     ///\e

   273     const bool &operator[](Key k) const { return imap[k];}

   274 #else

   275     Value operator[](Key k) const { return imap[k];}

   276     RefType operator[](Key k) { return imap[k];}

   277 #endif

   278     ///Iterator for the "false" edges

   279     class FalseIt : public BimType::FalseIt

   280     {

   281     public:

   282       ///\e

   283       explicit FalseIt(const IterableBoolEdgeMap &m)

   284 	: BimType::FalseIt(m.imap) { }

   285       ///\e

   286       FalseIt(Invalid i) : BimType::FalseIt(i) { }

   287     };

   288     ///Iterator for the "true" edges

   289     class TrueIt : public BimType::TrueIt

   290     {

   291     public:

   292       ///\e

   293       explicit TrueIt(const IterableBoolEdgeMap &m)

   294 	: BimType::TrueIt(m.imap) { }

   295       ///\e

   296       TrueIt(Invalid i) : BimType::TrueIt(i) { }

   297     };

   298   };

   301   namespace _iterable_maps_bits {

   302     template <typename Item>

   303     struct IterableIntMapNode {

   304       IterableIntMapNode() {}

   305       IterableIntMapNode(int _value) : value(_value) {}

   306       Item prev, next;

   307       int value;

   308     };

   309   }

   311   ///\ingroup maps

   312   ///

   313   /// \brief Dynamic iterable integer map.

   314   ///

   315   /// This class provides a special graph map type which can store

   316   /// for each graph item(node, edge, etc.) an integer value. For each

   317   /// non negative value it is possible to iterate on the keys which

   318   /// mapped to the given value.

   319   ///

   320   /// \param _Graph The graph type.

   321   /// \param _Item One of the graph's item type, the key of the map.

   322   template <typename _Graph, typename _Item>

   323   class IterableIntMap : protected ItemSetTraits<_Graph, _Item>

   324   ::template Map<_iterable_maps_bits::IterableIntMapNode<_Item> >::Parent {

   325   public:

   326     typedef typename ItemSetTraits<_Graph, _Item>

   327     ::template Map<_iterable_maps_bits::IterableIntMapNode<_Item> >

   328     ::Parent Parent;

   330     /// The key type

   331     typedef _Item Key;

   332     /// The value type

   333     typedef int Value;

   334     /// The graph type

   335     typedef _Graph Graph;

   337     /// \brief Constructor of the Map.

   338     ///

   339     /// Constructor of the Map. It set all values -1.

   340     explicit IterableIntMap(const Graph& graph)

   341       : Parent(graph, _iterable_maps_bits::IterableIntMapNode<_Item>(-1)) {}

   343     /// \brief Constructor of the Map with a given value.

   344     ///

   345     /// Constructor of the Map with a given value.

   346     explicit IterableIntMap(const Graph& graph, int value)

   347       : Parent(graph, _iterable_maps_bits::IterableIntMapNode<_Item>(value)) {

   348       if (value >= 0) {

   349 	for (typename Parent::ItemIt it(*this); it != INVALID; ++it) {

   350 	  lace(it);

   351 	}

   352       }

   353     }

   355   private:

   357     void unlace(const Key& key) {

   358       typename Parent::Value& node = Parent::operator[](key);

   359       if (node.value < 0) return;

   360       if (node.prev != INVALID) {

   361 	Parent::operator[](node.prev).next = node.next;

   362       } else {

   363 	first[node.value] = node.next;

   364       }

   365       if (node.next != INVALID) {

   366 	Parent::operator[](node.next).prev = node.prev;

   367       }

   368       while (!first.empty() && first.back() == INVALID) {

   369 	first.pop_back();

   370       }

   371     }

   373     void lace(const Key& key) {

   374       typename Parent::Value& node = Parent::operator[](key);

   375       if (node.value < 0) return;

   376       if (node.value >= (int)first.size()) {

   377 	first.resize(node.value + 1, INVALID);

   378       }

   379       node.prev = INVALID;

   380       node.next = first[node.value];

   381       if (node.next != INVALID) {

   382 	Parent::operator[](node.next).prev = key;

   383       }

   384       first[node.value] = key;

   385     }

   387   public:

   389     /// Indicates that the map if reference map.

   390     typedef True ReferenceMapTag;

   392     /// \brief Refernce to the value of the map.

   393     ///

   394     /// This class is near to similar to the int type. It can

   395     /// be converted to int and it has the same operators.

   396     class Reference {

   397       friend class IterableIntMap;

   398     private:

   399       Reference(IterableIntMap& map, const Key& key)

   400 	: _key(key), _map(map) {}

   401     public:

   403       Reference& operator=(const Reference& value) {

   404 	_map.set(_key, (const int&)value);

   405  	return *this;

   406       }

   408       operator const int&() const {

   409 	return static_cast<const IterableIntMap&>(_map)[_key];

   410       }

   412       Reference& operator=(int value) {

   413 	_map.set(_key, value);

   414 	return *this;

   415       }

   416       Reference& operator++() {

   417 	_map.set(_key, _map[_key] + 1);

   418 	return *this;

   419       }

   420       int operator++(int) {

   421 	int value = _map[_key];

   422 	_map.set(_key, value + 1);

   423 	return value;

   424       }

   425       Reference& operator--() {

   426 	_map.set(_key, _map[_key] - 1);

   427 	return *this;

   428       }

   429       int operator--(int) {

   430 	int value = _map[_key];

   431 	_map.set(_key, value - 1);

   432 	return value;

   433       }

   434       Reference& operator+=(int value) {

   435 	_map.set(_key, _map[_key] + value);

   436 	return *this;

   437       }

   438       Reference& operator-=(int value) {

   439 	_map.set(_key, _map[_key] - value);

   440 	return *this;

   441       }

   442       Reference& operator*=(int value) {

   443 	_map.set(_key, _map[_key] * value);

   444 	return *this;

   445       }

   446       Reference& operator/=(int value) {

   447 	_map.set(_key, _map[_key] / value);

   448 	return *this;

   449       }

   450       Reference& operator%=(int value) {

   451 	_map.set(_key, _map[_key] % value);

   452 	return *this;

   453       }

   454       Reference& operator&=(int value) {

   455 	_map.set(_key, _map[_key] & value);

   456 	return *this;

   457       }

   458       Reference& operator|=(int value) {

   459 	_map.set(_key, _map[_key] | value);

   460 	return *this;

   461       }

   462       Reference& operator^=(int value) {

   463 	_map.set(_key, _map[_key] ^ value);

   464 	return *this;

   465       }

   466       Reference& operator<<=(int value) {

   467 	_map.set(_key, _map[_key] << value);

   468 	return *this;

   469       }

   470       Reference& operator>>=(int value) {

   471 	_map.set(_key, _map[_key] >> value);

   472 	return *this;

   473       }

   475     private:

   476       Key _key;

   477       IterableIntMap& _map;

   478     };

   480     /// The const reference type.

   481     typedef const Value& ConstReference;

   483     /// \brief Gives back the maximal value plus one.

   484     ///

   485     /// Gives back the maximal value plus one.

   486     int size() const {

   487       return (int)first.size();

   488     }

   490     /// \brief Set operation of the map.

   491     ///

   492     /// Set operation of the map.

   493     void set(const Key& key, const Value& value) {

   494       unlace(key);

   495       Parent::operator[](key).value = value;

   496       lace(key);

   497     }

   499     /// \brief Const subscript operator of the map.

   500     ///

   501     /// Const subscript operator of the map.

   502     const Value& operator[](const Key& key) const {

   503       return Parent::operator[](key).value;

   504     }

   506     /// \brief Subscript operator of the map.

   507     ///

   508     /// Subscript operator of the map.

   509     Reference operator[](const Key& key) {

   510       return Reference(*this, key);

   511     }

   513     /// \brief Iterator for the keys with the same value.

   514     ///

   515     /// Iterator for the keys with the same value. It works

   516     /// like a graph item iterator in the map, it can be converted

   517     /// the item type of the map, incremented with \c ++ operator, and

   518     /// if the iterator leave the last valid item it will be equal to

   519     /// \c INVALID.

   520     class ItemIt : public _Item {

   521     public:

   522       typedef _Item Parent;

   524       /// \brief Invalid constructor \& conversion.

   525       ///

   526       /// This constructor initializes the item to be invalid.

   527       /// \sa Invalid for more details.

   528       ItemIt(Invalid) : Parent(INVALID), _map(0) {}

   530       /// \brief Creates an iterator with a value.

   531       ///

   532       /// Creates an iterator with a value. It iterates on the

   533       /// keys which have the given value.

   534       /// \param map The IterableIntMap

   535       /// \param value The value

   536       ItemIt(const IterableIntMap& map, int value) : _map(&map) {

   537 	if (value < 0 || value >= (int)_map->first.size()) {

   538 	  Parent::operator=(INVALID);

   539 	} else {

   540 	  Parent::operator=(_map->first[value]);

   541 	}

   542       }

   544       /// \brief Increment operator.

   545       ///

   546       /// Increment Operator.

   547       ItemIt& operator++() {

   548 	Parent::operator=(_map->IterableIntMap::Parent::

   549 			  operator[](static_cast<Parent&>(*this)).next);

   550 	return *this;

   551       }

   554     private:

   555       const IterableIntMap* _map;

   556     };

   558   protected:

   560     virtual void erase(const Key& key) {

   561       unlace(key);

   562       Parent::erase(key);

   563     }

   565     virtual void clear() {

   566       first.clear();

   567       Parent::clear();

   568     }

   570   private:

   571     std::vector<_Item> first;

   572   };

   574   /// @}

   575 }

author	hegyi
	Mon, 21 Nov 2005 18:03:20 +0000
changeset 1823	cb082cdf3667
parent 1805	d284f81f02a5
child 1873	d73c7f115f53
permissions	-rw-r--r--