1 | /* -*- C++ -*- |
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2 | * src/lemon/maps.h - Part of LEMON, a generic C++ optimization library |
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3 | * |
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4 | * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
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5 | * (Egervary Combinatorial Optimization Research Group, 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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17 | #ifndef LEMON_MAPS_H |
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18 | #define LEMON_MAPS_H |
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19 | |
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20 | #include<math.h> |
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21 | |
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22 | ///\file |
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23 | ///\ingroup maps |
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24 | ///\brief Miscellaneous property maps |
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25 | /// |
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26 | ///\todo This file has the same name as the concept file in concept/, |
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27 | /// and this is not easily detectable in docs... |
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28 | |
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29 | #include <map> |
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30 | |
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31 | namespace lemon { |
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32 | |
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33 | /// \addtogroup maps |
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34 | /// @{ |
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35 | |
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36 | /// Base class of maps. |
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37 | |
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38 | /// Base class of maps. |
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39 | /// It provides the necessary <tt>typedef</tt>s required by the map concept. |
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40 | template<typename K, typename T> |
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41 | class MapBase |
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42 | { |
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43 | public: |
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44 | ///\e |
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45 | typedef K Key; |
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46 | ///\e |
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47 | typedef T Value; |
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48 | }; |
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49 | |
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50 | /// Null map. (a.k.a. DoNothingMap) |
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51 | |
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52 | /// If you have to provide a map only for its type definitions, |
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53 | /// or if you have to provide a writable map, but |
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54 | /// data written to it will sent to <tt>/dev/null</tt>... |
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55 | template<typename K, typename T> |
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56 | class NullMap : public MapBase<K,T> |
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57 | { |
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58 | public: |
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59 | |
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60 | /// Gives back a default constructed element. |
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61 | T operator[](const K&) const { return T(); } |
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62 | /// Absorbs the value. |
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63 | void set(const K&, const T&) {} |
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64 | }; |
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65 | |
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66 | |
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67 | /// Constant map. |
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68 | |
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69 | /// This is a readable map which assigns a specified value to each key. |
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70 | /// In other aspects it is equivalent to the \ref NullMap. |
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71 | /// \todo set could be used to set the value. |
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72 | template<typename K, typename T> |
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73 | class ConstMap : public MapBase<K,T> |
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74 | { |
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75 | T v; |
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76 | public: |
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77 | |
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78 | /// Default constructor |
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79 | |
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80 | /// The value of the map will be uninitialized. |
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81 | /// (More exactly it will be default constructed.) |
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82 | ConstMap() {} |
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83 | ///\e |
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84 | |
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85 | /// \param _v The initial value of the map. |
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86 | /// |
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87 | ConstMap(const T &_v) : v(_v) {} |
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88 | |
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89 | T operator[](const K&) const { return v; } |
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90 | void set(const K&, const T&) {} |
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91 | |
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92 | template<typename T1> |
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93 | struct rebind { |
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94 | typedef ConstMap<K,T1> other; |
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95 | }; |
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96 | |
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97 | template<typename T1> |
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98 | ConstMap(const ConstMap<K,T1> &, const T &_v) : v(_v) {} |
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99 | }; |
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100 | |
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101 | ///Returns a \ref ConstMap class |
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102 | |
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103 | ///This function just returns a \ref ConstMap class. |
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104 | ///\relates ConstMap |
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105 | template<class V,class K> |
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106 | inline ConstMap<V,K> constMap(const K &k) |
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107 | { |
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108 | return ConstMap<V,K>(k); |
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109 | } |
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110 | |
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111 | |
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112 | //to document later |
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113 | template<typename T, T v> |
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114 | struct Const { }; |
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115 | //to document later |
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116 | template<typename K, typename V, V v> |
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117 | class ConstMap<K, Const<V, v> > : public MapBase<K, V> |
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118 | { |
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119 | public: |
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120 | ConstMap() { } |
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121 | V operator[](const K&) const { return v; } |
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122 | void set(const K&, const V&) { } |
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123 | }; |
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124 | |
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125 | /// \c std::map wrapper |
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126 | |
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127 | /// This is essentially a wrapper for \c std::map. With addition that |
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128 | /// you can specify a default value different from \c Value() . |
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129 | /// |
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130 | /// \todo Provide allocator parameter... |
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131 | template <typename K, typename T, typename Compare = std::less<K> > |
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132 | class StdMap : public std::map<K,T,Compare> { |
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133 | typedef std::map<K,T,Compare> parent; |
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134 | T v; |
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135 | typedef typename parent::value_type PairType; |
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136 | |
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137 | public: |
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138 | typedef K Key; |
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139 | typedef T Value; |
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140 | typedef T& Reference; |
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141 | typedef const T& ConstReference; |
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142 | |
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143 | |
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144 | StdMap() : v() {} |
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145 | /// Constructor with specified default value |
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146 | StdMap(const T& _v) : v(_v) {} |
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147 | |
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148 | /// \brief Constructs the map from an appropriate std::map. |
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149 | /// |
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150 | /// \warning Inefficient: copies the content of \c m ! |
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151 | StdMap(const parent &m) : parent(m) {} |
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152 | /// \brief Constructs the map from an appropriate std::map, and explicitly |
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153 | /// specifies a default value. |
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154 | /// |
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155 | /// \warning Inefficient: copies the content of \c m ! |
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156 | StdMap(const parent &m, const T& _v) : parent(m), v(_v) {} |
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157 | |
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158 | template<typename T1, typename Comp1> |
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159 | StdMap(const StdMap<Key,T1,Comp1> &m, const T &_v) { |
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160 | //FIXME; |
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161 | } |
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162 | |
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163 | Reference operator[](const Key &k) { |
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164 | return insert(PairType(k,v)).first -> second; |
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165 | } |
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166 | ConstReference operator[](const Key &k) const { |
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167 | typename parent::iterator i = lower_bound(k); |
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168 | if (i == parent::end() || parent::key_comp()(k, (*i).first)) |
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169 | return v; |
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170 | return (*i).second; |
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171 | } |
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172 | void set(const Key &k, const T &t) { |
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173 | parent::operator[](k) = t; |
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174 | } |
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175 | |
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176 | /// Changes the default value of the map. |
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177 | /// \return Returns the previous default value. |
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178 | /// |
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179 | /// \warning The value of some keys (which has already been queried, but |
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180 | /// the value has been unchanged from the default) may change! |
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181 | T setDefault(const T &_v) { T old=v; v=_v; return old; } |
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182 | |
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183 | template<typename T1> |
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184 | struct rebind { |
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185 | typedef StdMap<Key,T1,Compare> other; |
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186 | }; |
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187 | }; |
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188 | |
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189 | |
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190 | ///Sum of two maps |
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191 | |
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192 | ///This \ref concept::ReadMap "read only map" returns the sum of the two |
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193 | ///given maps. Its \c Key and \c Value will be inherited from \c M1. |
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194 | ///The \c Key and \c Value of M2 must be convertible to those of \c M1. |
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195 | |
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196 | template<class M1,class M2> |
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197 | class AddMap |
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198 | { |
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199 | const M1 &m1; |
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200 | const M2 &m2; |
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201 | public: |
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202 | typedef typename M1::Key Key; |
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203 | typedef typename M1::Value Value; |
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204 | |
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205 | ///Constructor |
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206 | |
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207 | ///\e |
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208 | /// |
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209 | AddMap(const M1 &_m1,const M2 &_m2) : m1(_m1), m2(_m2) {}; |
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210 | Value operator[](Key k) const {return m1[k]+m2[k];} |
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211 | }; |
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212 | |
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213 | ///Returns an \ref AddMap class |
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214 | |
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215 | ///This function just returns an \ref AddMap class. |
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216 | ///\todo How to call these type of functions? |
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217 | /// |
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218 | ///\relates AddMap |
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219 | ///\todo Wrong scope in Doxygen when \c \\relates is used |
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220 | template<class M1,class M2> |
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221 | inline AddMap<M1,M2> addMap(const M1 &m1,const M2 &m2) |
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222 | { |
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223 | return AddMap<M1,M2>(m1,m2); |
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224 | } |
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225 | |
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226 | ///Shift a maps with a constant. |
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227 | |
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228 | ///This \ref concept::ReadMap "read only map" returns the sum of the |
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229 | ///given map and a constant value. |
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230 | ///Its \c Key and \c Value is inherited from \c M. |
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231 | /// |
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232 | ///Actually, |
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233 | ///\code |
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234 | /// ShiftMap<X> sh(x,v); |
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235 | ///\endcode |
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236 | ///it is equivalent with |
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237 | ///\code |
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238 | /// ConstMap<X::Key, X::Value> c_tmp(v); |
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239 | /// AddMap<X, ConstMap<X::Key, X::Value> > sh(x,v); |
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240 | ///\endcode |
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241 | template<class M> |
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242 | class ShiftMap |
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243 | { |
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244 | const M &m; |
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245 | typename M::Value v; |
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246 | public: |
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247 | typedef typename M::Key Key; |
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248 | typedef typename M::Value Value; |
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249 | |
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250 | ///Constructor |
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251 | |
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252 | ///Constructor |
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253 | ///\param _m is the undelying map |
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254 | ///\param _v is the shift value |
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255 | ShiftMap(const M &_m,const Value &_v ) : m(_m), v(_v) {}; |
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256 | Value operator[](Key k) const {return m[k]+v;} |
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257 | }; |
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258 | |
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259 | ///Returns an \ref ShiftMap class |
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260 | |
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261 | ///This function just returns an \ref ShiftMap class. |
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262 | ///\relates ShiftMap |
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263 | ///\todo A better name is required. |
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264 | template<class M> |
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265 | inline ShiftMap<M> shiftMap(const M &m,const typename M::Value &v) |
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266 | { |
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267 | return ShiftMap<M>(m,v); |
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268 | } |
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269 | |
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270 | ///Difference of two maps |
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271 | |
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272 | ///This \ref concept::ReadMap "read only map" returns the difference |
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273 | ///of the values returned by the two |
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274 | ///given maps. Its \c Key and \c Value will be inherited from \c M1. |
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275 | ///The \c Key and \c Value of \c M2 must be convertible to those of \c M1. |
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276 | |
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277 | template<class M1,class M2> |
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278 | class SubMap |
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279 | { |
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280 | const M1 &m1; |
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281 | const M2 &m2; |
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282 | public: |
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283 | typedef typename M1::Key Key; |
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284 | typedef typename M1::Value Value; |
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285 | |
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286 | ///Constructor |
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287 | |
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288 | ///\e |
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289 | /// |
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290 | SubMap(const M1 &_m1,const M2 &_m2) : m1(_m1), m2(_m2) {}; |
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291 | Value operator[](Key k) const {return m1[k]-m2[k];} |
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292 | }; |
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293 | |
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294 | ///Returns a \ref SubMap class |
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295 | |
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296 | ///This function just returns a \ref SubMap class. |
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297 | /// |
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298 | ///\relates SubMap |
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299 | template<class M1,class M2> |
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300 | inline SubMap<M1,M2> subMap(const M1 &m1,const M2 &m2) |
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301 | { |
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302 | return SubMap<M1,M2>(m1,m2); |
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303 | } |
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304 | |
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305 | ///Product of two maps |
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306 | |
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307 | ///This \ref concept::ReadMap "read only map" returns the product of the |
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308 | ///values returned by the two |
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309 | ///given |
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310 | ///maps. Its \c Key and \c Value will be inherited from \c M1. |
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311 | ///The \c Key and \c Value of \c M2 must be convertible to those of \c M1. |
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312 | |
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313 | template<class M1,class M2> |
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314 | class MulMap |
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315 | { |
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316 | const M1 &m1; |
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317 | const M2 &m2; |
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318 | public: |
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319 | typedef typename M1::Key Key; |
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320 | typedef typename M1::Value Value; |
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321 | |
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322 | ///Constructor |
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323 | |
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324 | ///\e |
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325 | /// |
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326 | MulMap(const M1 &_m1,const M2 &_m2) : m1(_m1), m2(_m2) {}; |
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327 | Value operator[](Key k) const {return m1[k]*m2[k];} |
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328 | }; |
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329 | |
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330 | ///Returns a \ref MulMap class |
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331 | |
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332 | ///This function just returns a \ref MulMap class. |
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333 | ///\relates MulMap |
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334 | template<class M1,class M2> |
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335 | inline MulMap<M1,M2> mulMap(const M1 &m1,const M2 &m2) |
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336 | { |
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337 | return MulMap<M1,M2>(m1,m2); |
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338 | } |
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339 | |
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340 | ///Scale a maps with a constant. |
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341 | |
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342 | ///This \ref concept::ReadMap "read only map" returns the value of the |
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343 | ///given map multipied with a constant value. |
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344 | ///Its \c Key and \c Value is inherited from \c M. |
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345 | /// |
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346 | ///Actually, |
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347 | ///\code |
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348 | /// ScaleMap<X> sc(x,v); |
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349 | ///\endcode |
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350 | ///it is equivalent with |
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351 | ///\code |
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352 | /// ConstMap<X::Key, X::Value> c_tmp(v); |
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353 | /// MulMap<X, ConstMap<X::Key, X::Value> > sc(x,v); |
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354 | ///\endcode |
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355 | template<class M> |
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356 | class ScaleMap |
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357 | { |
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358 | const M &m; |
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359 | typename M::Value v; |
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360 | public: |
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361 | typedef typename M::Key Key; |
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362 | typedef typename M::Value Value; |
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363 | |
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364 | ///Constructor |
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365 | |
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366 | ///Constructor |
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367 | ///\param _m is the undelying map |
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368 | ///\param _v is the scaling value |
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369 | ScaleMap(const M &_m,const Value &_v ) : m(_m), v(_v) {}; |
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370 | Value operator[](Key k) const {return m[k]*v;} |
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371 | }; |
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372 | |
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373 | ///Returns an \ref ScaleMap class |
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374 | |
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375 | ///This function just returns an \ref ScaleMap class. |
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376 | ///\relates ScaleMap |
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377 | ///\todo A better name is required. |
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378 | template<class M> |
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379 | inline ScaleMap<M> scaleMap(const M &m,const typename M::Value &v) |
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380 | { |
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381 | return ScaleMap<M>(m,v); |
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382 | } |
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383 | |
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384 | ///Quotient of two maps |
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385 | |
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386 | ///This \ref concept::ReadMap "read only map" returns the quotient of the |
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387 | ///values returned by the two |
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388 | ///given maps. Its \c Key and \c Value will be inherited from \c M1. |
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389 | ///The \c Key and \c Value of \c M2 must be convertible to those of \c M1. |
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390 | |
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391 | template<class M1,class M2> |
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392 | class DivMap |
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393 | { |
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394 | const M1 &m1; |
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395 | const M2 &m2; |
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396 | public: |
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397 | typedef typename M1::Key Key; |
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398 | typedef typename M1::Value Value; |
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399 | |
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400 | ///Constructor |
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401 | |
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402 | ///\e |
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403 | /// |
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404 | DivMap(const M1 &_m1,const M2 &_m2) : m1(_m1), m2(_m2) {}; |
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405 | Value operator[](Key k) const {return m1[k]/m2[k];} |
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406 | }; |
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407 | |
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408 | ///Returns a \ref DivMap class |
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409 | |
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410 | ///This function just returns a \ref DivMap class. |
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411 | ///\relates DivMap |
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412 | template<class M1,class M2> |
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413 | inline DivMap<M1,M2> divMap(const M1 &m1,const M2 &m2) |
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414 | { |
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415 | return DivMap<M1,M2>(m1,m2); |
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416 | } |
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417 | |
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418 | ///Composition of two maps |
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419 | |
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420 | ///This \ref concept::ReadMap "read only map" returns the composition of |
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421 | ///two |
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422 | ///given maps. That is to say, if \c m1 is of type \c M1 and \c m2 is |
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423 | ///of \c M2, |
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424 | ///then for |
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425 | ///\code |
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426 | /// ComposeMap<M1,M2> cm(m1,m2); |
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427 | ///\endcode |
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428 | /// <tt>cm[x]</tt> will be equal to <tt>m1[m2[x]]</tt> |
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429 | /// |
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430 | ///Its \c Key is inherited from \c M2 and its \c Value is from |
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431 | ///\c M1. |
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432 | ///The \c M2::Value must be convertible to \c M1::Key. |
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433 | ///\todo Check the requirements. |
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434 | |
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435 | template<class M1,class M2> |
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436 | class ComposeMap |
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437 | { |
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438 | const M1 &m1; |
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439 | const M2 &m2; |
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440 | public: |
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441 | typedef typename M2::Key Key; |
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442 | typedef typename M1::Value Value; |
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443 | |
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444 | ///Constructor |
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445 | |
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446 | ///\e |
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447 | /// |
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448 | ComposeMap(const M1 &_m1,const M2 &_m2) : m1(_m1), m2(_m2) {}; |
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449 | Value operator[](Key k) const {return m1[m2[k]];} |
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450 | }; |
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451 | |
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452 | ///Returns a \ref ComposeMap class |
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453 | |
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454 | ///This function just returns a \ref ComposeMap class. |
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455 | ///\relates ComposeMap |
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456 | template<class M1,class M2> |
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457 | inline ComposeMap<M1,M2> composeMap(const M1 &m1,const M2 &m2) |
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458 | { |
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459 | return ComposeMap<M1,M2>(m1,m2); |
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460 | } |
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461 | |
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462 | ///Negative value of a map |
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463 | |
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464 | ///This \ref concept::ReadMap "read only map" returns the negative |
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465 | ///value of the |
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466 | ///value returned by the |
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467 | ///given map. Its \c Key and \c Value will be inherited from \c M. |
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468 | ///The unary \c - operator must be defined for \c Value, of course. |
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469 | |
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470 | template<class M> |
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471 | class NegMap |
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472 | { |
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473 | const M &m; |
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474 | public: |
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475 | typedef typename M::Key Key; |
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476 | typedef typename M::Value Value; |
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477 | |
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478 | ///Constructor |
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479 | |
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480 | ///\e |
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481 | /// |
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482 | NegMap(const M &_m) : m(_m) {}; |
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483 | Value operator[](Key k) const {return -m[k];} |
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484 | }; |
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485 | |
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486 | ///Returns a \ref NegMap class |
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487 | |
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488 | ///This function just returns a \ref NegMap class. |
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489 | ///\relates NegMap |
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490 | template<class M> |
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491 | inline NegMap<M> negMap(const M &m) |
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492 | { |
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493 | return NegMap<M>(m); |
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494 | } |
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495 | |
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496 | |
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497 | ///Absolute value of a map |
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498 | |
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499 | ///This \ref concept::ReadMap "read only map" returns the absolute value |
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500 | ///of the |
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501 | ///value returned by the |
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502 | ///given map. Its \c Key and \c Value will be inherited |
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503 | ///from <tt>M</tt>. <tt>Value</tt> |
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504 | ///must be comparable to <tt>0</tt> and the unary <tt>-</tt> |
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505 | ///operator must be defined for it, of course. |
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506 | /// |
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507 | ///\bug We need a unified way to handle the situation below: |
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508 | ///\code |
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509 | /// struct _UnConvertible {}; |
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510 | /// template<class A> inline A t_abs(A a) {return _UnConvertible();} |
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511 | /// template<> inline int t_abs<>(int n) {return abs(n);} |
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512 | /// template<> inline long int t_abs<>(long int n) {return labs(n);} |
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513 | /// template<> inline long long int t_abs<>(long long int n) {return ::llabs(n);} |
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514 | /// template<> inline float t_abs<>(float n) {return fabsf(n);} |
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515 | /// template<> inline double t_abs<>(double n) {return fabs(n);} |
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516 | /// template<> inline long double t_abs<>(long double n) {return fabsl(n);} |
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517 | ///\endcode |
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518 | |
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519 | |
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520 | template<class M> |
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521 | class AbsMap |
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522 | { |
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523 | const M &m; |
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524 | public: |
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525 | typedef typename M::Key Key; |
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526 | typedef typename M::Value Value; |
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527 | |
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528 | ///Constructor |
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529 | |
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530 | ///\e |
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531 | /// |
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532 | AbsMap(const M &_m) : m(_m) {}; |
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533 | Value operator[](Key k) const {Value tmp=m[k]; return tmp>=0?tmp:-tmp;} |
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534 | }; |
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535 | |
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536 | ///Returns a \ref AbsMap class |
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537 | |
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538 | ///This function just returns a \ref AbsMap class. |
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539 | ///\relates AbsMap |
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540 | template<class M> |
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541 | inline AbsMap<M> absMap(const M &m) |
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542 | { |
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543 | return AbsMap<M>(m); |
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544 | } |
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545 | |
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546 | ///Converts an STL style functor to a a map |
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547 | |
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548 | ///This \ref concept::ReadMap "read only map" returns the value |
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549 | ///of a |
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550 | ///given map. |
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551 | /// |
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552 | ///Template parameters \c K and \c V will become its |
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553 | ///\c Key and \c Value. They must be given explicitely |
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554 | ///because a functor does not provide such typedefs. |
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555 | /// |
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556 | ///Parameter \c F is the type of the used functor. |
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557 | |
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558 | |
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559 | template<class K,class V,class F> |
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560 | class FunctorMap |
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561 | { |
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562 | const F &f; |
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563 | public: |
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564 | typedef K Key; |
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565 | typedef V Value; |
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566 | |
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567 | ///Constructor |
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568 | |
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569 | ///\e |
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570 | /// |
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571 | FunctorMap(const F &_f) : f(_f) {}; |
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572 | Value operator[](Key k) const {return f(k);} |
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573 | }; |
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574 | |
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575 | ///Returns a \ref FunctorMap class |
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576 | |
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577 | ///This function just returns a \ref FunctorMap class. |
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578 | /// |
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579 | ///The third template parameter isn't necessary to be given. |
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580 | ///\relates FunctorMap |
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581 | template<class K,class V, class F> |
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582 | inline FunctorMap<K,V,F> functorMap(const F &f) |
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583 | { |
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584 | return FunctorMap<K,V,F>(f); |
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585 | } |
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586 | |
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587 | ///Converts a map to an STL style functor |
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588 | |
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589 | ///This class Converts a map to an STL style functor. |
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590 | ///that is it provides an <tt>operator()</tt> to read its values. |
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591 | /// |
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592 | ///For the sake of convenience it also works as a ususal map, i.e |
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593 | ///<tt>operator[]</tt> and the \c Key and \c Valu typedefs also exist. |
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594 | |
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595 | template<class M> |
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596 | class MapFunctor |
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597 | { |
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598 | const M &m; |
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599 | public: |
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600 | typedef typename M::Key Key; |
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601 | typedef typename M::Value Value; |
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602 | |
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603 | ///Constructor |
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604 | |
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605 | ///\e |
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606 | /// |
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607 | MapFunctor(const M &_m) : m(_m) {}; |
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608 | ///Returns a value of the map |
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609 | |
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610 | ///\e |
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611 | /// |
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612 | Value operator()(Key k) const {return m[k];} |
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613 | ///\e |
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614 | /// |
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615 | Value operator[](Key k) const {return m[k];} |
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616 | }; |
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617 | |
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618 | ///Returns a \ref MapFunctor class |
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619 | |
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620 | ///This function just returns a \ref MapFunctor class. |
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621 | ///\relates MapFunctor |
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622 | template<class M> |
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623 | inline MapFunctor<M> mapFunctor(const M &m) |
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624 | { |
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625 | return MapFunctor<M>(m); |
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626 | } |
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627 | |
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628 | |
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629 | /// @} |
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630 | |
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631 | } |
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632 | |
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633 | |
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634 | #endif // LEMON_MAPS_H |
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