[1677] | 1 | /* -*- C++ -*- |
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| 2 | * lemon/iterable_maps.h - Part of LEMON, a generic C++ optimization library |
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| 3 | * |
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| 4 | * Copyright (C) 2005 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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| 5 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
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| 6 | * |
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| 7 | * Permission to use, modify and distribute this software is granted |
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| 8 | * provided that this copyright notice appears in all copies. For |
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| 9 | * precise terms see the accompanying LICENSE file. |
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| 10 | * |
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| 11 | * This software is provided "AS IS" with no warranty of any kind, |
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| 12 | * express or implied, and with no claim as to its suitability for any |
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| 13 | * purpose. |
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| 14 | * |
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| 15 | */ |
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| 16 | |
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[1752] | 17 | #include <lemon/traits.h> |
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| 18 | #include <lemon/invalid.h> |
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[1677] | 19 | #include <vector> |
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| 20 | #include <limits> |
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| 21 | |
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| 22 | ///\ingroup maps |
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| 23 | ///\file |
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| 24 | ///\brief Maps that makes it possible to iterate through the keys having |
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| 25 | ///a certain value |
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| 26 | /// |
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| 27 | /// |
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| 28 | |
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| 29 | |
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| 30 | namespace lemon { |
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| 31 | |
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| 32 | ///\todo This is only a static map! |
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[1805] | 33 | ///\todo Undocumented. |
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[1677] | 34 | ///\param BaseMap is an interger map. |
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| 35 | template<class BaseMap> |
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| 36 | class IterableBoolMap |
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| 37 | { |
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| 38 | public: |
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| 39 | |
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| 40 | typedef typename BaseMap::Key Key; |
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| 41 | typedef bool Value; |
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| 42 | |
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| 43 | friend class RefType; |
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| 44 | friend class FalseIt; |
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| 45 | friend class TrueIt; |
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| 46 | |
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| 47 | private: |
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| 48 | BaseMap &cref; |
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| 49 | std::vector<Key> vals; |
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| 50 | int sep; //map[e] is true <=> cref[e]>=sep |
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| 51 | |
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| 52 | bool isTrue(Key k) {return cref[k]>=sep;} |
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| 53 | void swap(Key k, int s) |
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| 54 | { |
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| 55 | int ti=cref[k]; |
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| 56 | Key tk=vals[s]; |
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| 57 | cref[k]=s; vals[s]=k; |
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| 58 | cref[tk]=ti; vals[ti]=tk; |
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| 59 | } |
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| 60 | |
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| 61 | void setTrue(Key k) { if(cref[k]<sep) { sep--; swap(k,sep); } } |
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| 62 | void setFalse(Key k) { if(cref[k]>=sep) { swap(k,sep); sep++; } } |
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| 63 | |
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| 64 | public: |
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| 65 | ///\e |
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| 66 | void set(Key k,Value v) { if(v) setTrue(k); else setFalse(k);} |
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[1805] | 67 | ///Number of \c true items in the map |
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| 68 | |
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| 69 | ///Returns the number of \c true values in the map. |
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| 70 | ///This is a constant time operation. |
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| 71 | int countTrue() { return vals.size()-sep; } |
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| 72 | ///Number of \c false items in the map |
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| 73 | |
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| 74 | ///Returns the number of \c false values in the map. |
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| 75 | ///This is a constant time operation. |
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| 76 | int countFalse() { return sep; } |
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[1677] | 77 | |
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| 78 | ///\e |
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| 79 | class FalseIt |
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| 80 | { |
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| 81 | const IterableBoolMap &M; |
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| 82 | int i; |
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| 83 | public: |
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[1805] | 84 | ///\e |
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[1677] | 85 | explicit FalseIt(const IterableBoolMap &_M) : M(_M), i(0) { } |
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[1805] | 86 | ///\e |
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[1677] | 87 | FalseIt(Invalid) |
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| 88 | : M(*((IterableBoolMap*)(0))), i(std::numeric_limits<int>::max()) { } |
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[1805] | 89 | ///\e |
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[1677] | 90 | FalseIt &operator++() { ++i; return *this;} |
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[1805] | 91 | ///\e |
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[1677] | 92 | operator Key() const { return i<M.sep ? M.vals[i] : INVALID; } |
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[1805] | 93 | ///\e |
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[1677] | 94 | bool operator !=(Invalid) const { return i<M.sep; } |
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[1805] | 95 | ///\e |
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[1677] | 96 | bool operator ==(Invalid) const { return i>=M.sep; } |
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| 97 | }; |
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| 98 | ///\e |
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| 99 | class TrueIt |
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| 100 | { |
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| 101 | const IterableBoolMap &M; |
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| 102 | int i; |
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| 103 | public: |
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[1805] | 104 | ///\e |
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[1677] | 105 | explicit TrueIt(const IterableBoolMap &_M) |
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| 106 | : M(_M), i(M.vals.size()-1) { } |
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[1805] | 107 | ///\e |
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[1677] | 108 | TrueIt(Invalid) |
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| 109 | : M(*((IterableBoolMap*)(0))), i(-1) { } |
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[1805] | 110 | ///\e |
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[1677] | 111 | TrueIt &operator++() { --i; return *this;} |
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[1805] | 112 | ///\e |
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[1677] | 113 | operator Key() const { return i>=M.sep ? M.vals[i] : INVALID; } |
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[1805] | 114 | ///\e |
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[1677] | 115 | bool operator !=(Invalid) const { return i>=M.sep; } |
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[1805] | 116 | ///\e |
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[1677] | 117 | bool operator ==(Invalid) const { return i<M.sep; } |
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| 118 | }; |
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| 119 | |
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| 120 | ///\e |
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| 121 | class RefType |
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| 122 | { |
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| 123 | IterableBoolMap &M; |
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| 124 | Key k; |
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| 125 | public: |
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| 126 | RefType(IterableBoolMap &_M,Key _k) : M(_M), k(_k) { } |
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| 127 | |
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| 128 | operator Value() const |
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| 129 | { |
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| 130 | return M.isTrue(k); |
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| 131 | } |
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| 132 | Value operator = (Value v) const { M.set(k,v); return v; } |
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| 133 | }; |
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| 134 | |
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| 135 | public: |
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| 136 | explicit IterableBoolMap(BaseMap &_m,bool init=false) : cref(_m) |
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| 137 | { |
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| 138 | sep=0; |
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[1810] | 139 | for(typename BaseMap::MapIt i(cref);i!=INVALID; ++i) { |
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| 140 | i.set(sep); |
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| 141 | vals.push_back(i); |
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[1677] | 142 | sep++; |
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| 143 | } |
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| 144 | if(init) sep=0; |
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| 145 | } |
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[1805] | 146 | ///\e |
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[1677] | 147 | RefType operator[] (Key k) { return RefType(*this,k);} |
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[1805] | 148 | ///\e |
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[1677] | 149 | Value operator[] (Key k) const { return isTrue(k);} |
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| 150 | }; |
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| 151 | |
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| 152 | |
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| 153 | |
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| 154 | |
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| 155 | /// \addtogroup graph_maps |
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| 156 | /// @{ |
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| 157 | |
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| 158 | /// Iterable bool NodeMap |
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| 159 | |
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| 160 | /// This map can be used in the same way |
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| 161 | /// as the standard NodeMap<bool> of the |
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| 162 | /// given graph \c Graph. |
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| 163 | /// In addition, this class provides two iterators called \ref TrueIt |
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| 164 | /// and \ref FalseIt to iterate through the "true" and "false" nodes. |
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| 165 | template <class Graph> |
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| 166 | class IterableBoolNodeMap |
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| 167 | { |
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[1685] | 168 | typename Graph::template NodeMap<int> cmap; |
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[1677] | 169 | |
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| 170 | public: |
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| 171 | |
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[1685] | 172 | typedef IterableBoolMap<typename Graph::template NodeMap<int> > BimType; |
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[1677] | 173 | BimType imap; |
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| 174 | |
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| 175 | |
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| 176 | typedef typename BimType::RefType RefType; |
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| 177 | typedef typename Graph::Node Key; |
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| 178 | typedef bool Value; |
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| 179 | |
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| 180 | friend class FalseIt; |
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| 181 | friend class TrueIt; |
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| 182 | |
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| 183 | ///\e |
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| 184 | IterableBoolNodeMap(const Graph &g,bool b=false) : cmap(g), imap(cmap,b) {} |
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| 185 | |
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| 186 | public: |
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| 187 | ///\e |
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| 188 | void set(Key k, bool v) { imap.set(k,v);} |
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[1805] | 189 | ///Number of \c true items in the map |
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| 190 | |
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| 191 | ///Returns the number of \c true values in the map. |
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| 192 | ///This is a constant time operation. |
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| 193 | int countTrue() { return imap.countTrue(); } |
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| 194 | ///Number of \c false items in the map |
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| 195 | |
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| 196 | ///Returns the number of \c false values in the map. |
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| 197 | ///This is a constant time operation. |
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| 198 | int countFalse() { return imap.countFalse(); } |
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[1677] | 199 | #ifdef DOXYGEN |
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| 200 | ///\e |
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| 201 | bool &operator[](Key k) { return imap[k];} |
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| 202 | ///\e |
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| 203 | const bool &operator[](Key k) const { return imap[k];} |
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| 204 | #else |
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| 205 | Value operator[](Key k) const { return imap[k];} |
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| 206 | RefType operator[](Key k) { return imap[k];} |
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| 207 | #endif |
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| 208 | ///Iterator for the "false" nodes |
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| 209 | class FalseIt : public BimType::FalseIt |
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| 210 | { |
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| 211 | public: |
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[1805] | 212 | ///\e |
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[1677] | 213 | explicit FalseIt(const IterableBoolNodeMap &m) |
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| 214 | : BimType::FalseIt(m.imap) { } |
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[1805] | 215 | ///\e |
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[1677] | 216 | FalseIt(Invalid i) : BimType::FalseIt(i) { } |
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| 217 | }; |
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| 218 | ///Iterator for the "true" nodes |
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| 219 | class TrueIt : public BimType::TrueIt |
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| 220 | { |
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| 221 | public: |
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[1805] | 222 | ///\e |
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[1677] | 223 | explicit TrueIt(const IterableBoolNodeMap &m) |
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| 224 | : BimType::TrueIt(m.imap) { } |
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[1805] | 225 | ///\e |
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[1677] | 226 | TrueIt(Invalid i) : BimType::TrueIt(i) { } |
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| 227 | }; |
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| 228 | }; |
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| 229 | |
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| 230 | /// Iterable bool EdgeMap |
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| 231 | |
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| 232 | /// This map can be used in the same way |
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| 233 | /// as the standard EdgeMap<bool> of the |
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| 234 | /// given graph \c Graph. |
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| 235 | /// In addition, this class provides two iterators called \ref TrueIt |
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| 236 | /// and \ref FalseIt to iterate through the "true" and "false" edges. |
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| 237 | template <class Graph> |
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| 238 | class IterableBoolEdgeMap |
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| 239 | { |
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[1685] | 240 | typename Graph::template EdgeMap<int> cmap; |
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[1677] | 241 | |
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| 242 | public: |
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| 243 | |
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[1685] | 244 | typedef IterableBoolMap<typename Graph::template EdgeMap<int> > BimType; |
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[1677] | 245 | BimType imap; |
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| 246 | |
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| 247 | |
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| 248 | typedef typename BimType::RefType RefType; |
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| 249 | typedef typename Graph::Edge Key; |
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| 250 | typedef bool Value; |
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| 251 | |
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| 252 | friend class FalseIt; |
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| 253 | friend class TrueIt; |
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| 254 | |
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| 255 | ///\e |
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| 256 | IterableBoolEdgeMap(const Graph &g,bool b=false) : cmap(g), imap(cmap,b) {} |
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| 257 | |
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| 258 | public: |
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| 259 | ///\e |
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| 260 | void set(Key k, bool v) { imap.set(k,v);} |
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[1805] | 261 | ///Returns the number of \c true values in the map. |
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| 262 | ///This is a constant time operation. |
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| 263 | int countTrue() { return imap.countTrue(); } |
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| 264 | ///Number of \c false items in the map |
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| 265 | |
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| 266 | ///Returns the number of \c false values in the map. |
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| 267 | ///This is a constant time operation. |
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| 268 | int countFalse() { return imap.countFalse(); } |
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[1677] | 269 | #ifdef DOXYGEN |
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| 270 | ///\e |
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| 271 | bool &operator[](Key k) { return imap[k];} |
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| 272 | ///\e |
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| 273 | const bool &operator[](Key k) const { return imap[k];} |
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| 274 | #else |
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| 275 | Value operator[](Key k) const { return imap[k];} |
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| 276 | RefType operator[](Key k) { return imap[k];} |
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| 277 | #endif |
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| 278 | ///Iterator for the "false" edges |
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| 279 | class FalseIt : public BimType::FalseIt |
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| 280 | { |
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| 281 | public: |
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[1805] | 282 | ///\e |
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[1677] | 283 | explicit FalseIt(const IterableBoolEdgeMap &m) |
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| 284 | : BimType::FalseIt(m.imap) { } |
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[1805] | 285 | ///\e |
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[1677] | 286 | FalseIt(Invalid i) : BimType::FalseIt(i) { } |
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| 287 | }; |
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| 288 | ///Iterator for the "true" edges |
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| 289 | class TrueIt : public BimType::TrueIt |
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| 290 | { |
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| 291 | public: |
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[1805] | 292 | ///\e |
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[1677] | 293 | explicit TrueIt(const IterableBoolEdgeMap &m) |
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| 294 | : BimType::TrueIt(m.imap) { } |
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[1805] | 295 | ///\e |
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[1677] | 296 | TrueIt(Invalid i) : BimType::TrueIt(i) { } |
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| 297 | }; |
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| 298 | }; |
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| 299 | |
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[1752] | 300 | |
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| 301 | namespace _iterable_maps_bits { |
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| 302 | template <typename Item> |
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| 303 | struct IterableIntMapNode { |
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[1810] | 304 | IterableIntMapNode() {} |
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| 305 | IterableIntMapNode(int _value) : value(_value) {} |
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[1752] | 306 | Item prev, next; |
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| 307 | int value; |
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| 308 | }; |
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| 309 | } |
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| 310 | |
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| 311 | ///\ingroup maps |
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| 312 | /// |
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| 313 | /// \brief Dynamic iterable integer map. |
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| 314 | /// |
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[1810] | 315 | /// This class provides a special graph map type which can store |
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| 316 | /// for each graph item(node, edge, etc.) an integer value. For each |
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| 317 | /// non negative value it is possible to iterate on the keys which |
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| 318 | /// mapped to the given value. |
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| 319 | /// |
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| 320 | /// \param _Graph The graph type. |
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| 321 | /// \param _Item One of the graph's item type, the key of the map. |
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[1752] | 322 | template <typename _Graph, typename _Item> |
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| 323 | class IterableIntMap : protected ItemSetTraits<_Graph, _Item> |
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| 324 | ::template Map<_iterable_maps_bits::IterableIntMapNode<_Item> >::Parent { |
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| 325 | public: |
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| 326 | typedef typename ItemSetTraits<_Graph, _Item> |
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| 327 | ::template Map<_iterable_maps_bits::IterableIntMapNode<_Item> > |
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| 328 | ::Parent Parent; |
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| 329 | |
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[1810] | 330 | /// The key type |
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[1752] | 331 | typedef _Item Key; |
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[1810] | 332 | /// The value type |
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[1752] | 333 | typedef int Value; |
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[1810] | 334 | /// The graph type |
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[1752] | 335 | typedef _Graph Graph; |
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| 336 | |
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[1810] | 337 | /// \brief Constructor of the Map. |
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| 338 | /// |
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| 339 | /// Constructor of the Map. It set all values -1. |
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| 340 | explicit IterableIntMap(const Graph& graph) |
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| 341 | : Parent(graph, _iterable_maps_bits::IterableIntMapNode<_Item>(-1)) {} |
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| 342 | |
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| 343 | /// \brief Constructor of the Map with a given value. |
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| 344 | /// |
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| 345 | /// Constructor of the Map with a given value. |
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| 346 | explicit IterableIntMap(const Graph& graph, int value) |
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| 347 | : Parent(graph, _iterable_maps_bits::IterableIntMapNode<_Item>(value)) { |
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| 348 | if (value >= 0) { |
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| 349 | for (typename Parent::ItemIt it(*this); it != INVALID; ++it) { |
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| 350 | lace(it); |
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| 351 | } |
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| 352 | } |
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| 353 | } |
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[1752] | 354 | |
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| 355 | private: |
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| 356 | |
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| 357 | void unlace(const Key& key) { |
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| 358 | typename Parent::Value& node = Parent::operator[](key); |
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| 359 | if (node.value < 0) return; |
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| 360 | if (node.prev != INVALID) { |
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| 361 | Parent::operator[](node.prev).next = node.next; |
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| 362 | } else { |
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| 363 | first[node.value] = node.next; |
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| 364 | } |
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| 365 | if (node.next != INVALID) { |
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| 366 | Parent::operator[](node.next).prev = node.prev; |
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| 367 | } |
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| 368 | while (!first.empty() && first.back() == INVALID) { |
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| 369 | first.pop_back(); |
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| 370 | } |
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| 371 | } |
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| 372 | |
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| 373 | void lace(const Key& key) { |
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| 374 | typename Parent::Value& node = Parent::operator[](key); |
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| 375 | if (node.value < 0) return; |
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| 376 | if (node.value >= (int)first.size()) { |
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| 377 | first.resize(node.value + 1, INVALID); |
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| 378 | } |
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| 379 | node.prev = INVALID; |
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| 380 | node.next = first[node.value]; |
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| 381 | if (node.next != INVALID) { |
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| 382 | Parent::operator[](node.next).prev = key; |
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| 383 | } |
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| 384 | first[node.value] = key; |
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| 385 | } |
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| 386 | |
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| 387 | public: |
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| 388 | |
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[1810] | 389 | /// Indicates that the map if reference map. |
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[1752] | 390 | typedef True ReferenceMapTag; |
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| 391 | |
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[1810] | 392 | /// \brief Refernce to the value of the map. |
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| 393 | /// |
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| 394 | /// This class is near to similar to the int type. It can |
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| 395 | /// be converted to int and it has the same operators. |
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[1752] | 396 | class Reference { |
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| 397 | friend class IterableIntMap; |
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| 398 | private: |
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| 399 | Reference(IterableIntMap& map, const Key& key) |
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| 400 | : _key(key), _map(map) {} |
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| 401 | public: |
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| 402 | |
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| 403 | Reference& operator=(const Reference& value) { |
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| 404 | _map.set(_key, (const int&)value); |
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| 405 | return *this; |
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| 406 | } |
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| 407 | |
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| 408 | operator const int&() const { |
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| 409 | return static_cast<const IterableIntMap&>(_map)[_key]; |
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| 410 | } |
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| 411 | |
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| 412 | Reference& operator=(int value) { |
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| 413 | _map.set(_key, value); |
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| 414 | return *this; |
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| 415 | } |
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[1759] | 416 | Reference& operator++() { |
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| 417 | _map.set(_key, _map[_key] + 1); |
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| 418 | return *this; |
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| 419 | } |
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| 420 | int operator++(int) { |
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| 421 | int value = _map[_key]; |
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| 422 | _map.set(_key, value + 1); |
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| 423 | return value; |
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| 424 | } |
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| 425 | Reference& operator--() { |
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| 426 | _map.set(_key, _map[_key] - 1); |
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| 427 | return *this; |
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| 428 | } |
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| 429 | int operator--(int) { |
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| 430 | int value = _map[_key]; |
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| 431 | _map.set(_key, value - 1); |
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| 432 | return value; |
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| 433 | } |
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[1752] | 434 | Reference& operator+=(int value) { |
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| 435 | _map.set(_key, _map[_key] + value); |
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| 436 | return *this; |
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| 437 | } |
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| 438 | Reference& operator-=(int value) { |
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| 439 | _map.set(_key, _map[_key] - value); |
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| 440 | return *this; |
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| 441 | } |
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| 442 | Reference& operator*=(int value) { |
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| 443 | _map.set(_key, _map[_key] * value); |
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| 444 | return *this; |
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| 445 | } |
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| 446 | Reference& operator/=(int value) { |
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| 447 | _map.set(_key, _map[_key] / value); |
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| 448 | return *this; |
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| 449 | } |
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| 450 | Reference& operator%=(int value) { |
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| 451 | _map.set(_key, _map[_key] % value); |
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| 452 | return *this; |
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| 453 | } |
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| 454 | Reference& operator&=(int value) { |
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| 455 | _map.set(_key, _map[_key] & value); |
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| 456 | return *this; |
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| 457 | } |
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| 458 | Reference& operator|=(int value) { |
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| 459 | _map.set(_key, _map[_key] | value); |
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| 460 | return *this; |
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| 461 | } |
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| 462 | Reference& operator^=(int value) { |
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| 463 | _map.set(_key, _map[_key] ^ value); |
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| 464 | return *this; |
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| 465 | } |
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| 466 | Reference& operator<<=(int value) { |
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| 467 | _map.set(_key, _map[_key] << value); |
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| 468 | return *this; |
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| 469 | } |
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| 470 | Reference& operator>>=(int value) { |
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| 471 | _map.set(_key, _map[_key] >> value); |
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| 472 | return *this; |
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| 473 | } |
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| 474 | |
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| 475 | private: |
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| 476 | Key _key; |
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| 477 | IterableIntMap& _map; |
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| 478 | }; |
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[1810] | 479 | |
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| 480 | /// The const reference type. |
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[1752] | 481 | typedef const Value& ConstReference; |
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| 482 | |
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[1810] | 483 | /// \brief Gives back the maximal value plus one. |
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| 484 | /// |
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| 485 | /// Gives back the maximal value plus one. |
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[1752] | 486 | int size() const { |
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| 487 | return (int)first.size(); |
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| 488 | } |
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| 489 | |
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[1810] | 490 | /// \brief Set operation of the map. |
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| 491 | /// |
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| 492 | /// Set operation of the map. |
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[1752] | 493 | void set(const Key& key, const Value& value) { |
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| 494 | unlace(key); |
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| 495 | Parent::operator[](key).value = value; |
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| 496 | lace(key); |
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| 497 | } |
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| 498 | |
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[1810] | 499 | /// \brief Const subscript operator of the map. |
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| 500 | /// |
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| 501 | /// Const subscript operator of the map. |
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[1752] | 502 | const Value& operator[](const Key& key) const { |
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| 503 | return Parent::operator[](key).value; |
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| 504 | } |
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| 505 | |
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[1810] | 506 | /// \brief Subscript operator of the map. |
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| 507 | /// |
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| 508 | /// Subscript operator of the map. |
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[1752] | 509 | Reference operator[](const Key& key) { |
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| 510 | return Reference(*this, key); |
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| 511 | } |
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| 512 | |
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[1810] | 513 | /// \brief Iterator for the keys with the same value. |
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| 514 | /// |
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| 515 | /// Iterator for the keys with the same value. It works |
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| 516 | /// like a graph item iterator in the map, it can be converted |
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| 517 | /// the item type of the map, incremented with \c ++ operator, and |
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| 518 | /// if the iterator leave the last valid item it will be equal to |
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| 519 | /// \c INVALID. |
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[1752] | 520 | class ItemIt : public _Item { |
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| 521 | public: |
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| 522 | typedef _Item Parent; |
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| 523 | |
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[1810] | 524 | /// \brief Invalid constructor \& conversion. |
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| 525 | /// |
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| 526 | /// This constructor initializes the item to be invalid. |
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| 527 | /// \sa Invalid for more details. |
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[1752] | 528 | ItemIt(Invalid) : Parent(INVALID), _map(0) {} |
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| 529 | |
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[1810] | 530 | /// \brief Creates an iterator with a value. |
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| 531 | /// |
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| 532 | /// Creates an iterator with a value. It iterates on the |
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| 533 | /// keys which have the given value. |
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| 534 | /// \param map The IterableIntMap |
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| 535 | /// \param value The value |
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[1752] | 536 | ItemIt(const IterableIntMap& map, int value) : _map(&map) { |
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| 537 | if (value < 0 || value >= (int)_map->first.size()) { |
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| 538 | Parent::operator=(INVALID); |
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| 539 | } else { |
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| 540 | Parent::operator=(_map->first[value]); |
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| 541 | } |
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| 542 | } |
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| 543 | |
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[1810] | 544 | /// \brief Increment operator. |
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| 545 | /// |
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| 546 | /// Increment Operator. |
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[1752] | 547 | ItemIt& operator++() { |
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| 548 | Parent::operator=(_map->IterableIntMap::Parent:: |
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| 549 | operator[](static_cast<Parent&>(*this)).next); |
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| 550 | return *this; |
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| 551 | } |
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| 552 | |
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| 553 | |
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| 554 | private: |
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| 555 | const IterableIntMap* _map; |
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| 556 | }; |
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| 557 | |
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| 558 | protected: |
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| 559 | |
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| 560 | virtual void erase(const Key& key) { |
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| 561 | unlace(key); |
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| 562 | Parent::erase(key); |
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| 563 | } |
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| 564 | |
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| 565 | virtual void clear() { |
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| 566 | first.clear(); |
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| 567 | Parent::clear(); |
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| 568 | } |
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| 569 | |
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| 570 | private: |
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| 571 | std::vector<_Item> first; |
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| 572 | }; |
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| 573 | |
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[1677] | 574 | /// @} |
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| 575 | } |
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