1 | // -*- c++ -*- |
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2 | #ifndef HUGO_SKELETON_GRAPH_H |
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3 | #define HUGO_SKELETON_GRAPH_H |
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4 | |
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5 | ///\ingroup skeletons |
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6 | ///\file |
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7 | ///\brief Declaration of GraphSkeleton. |
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8 | |
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9 | #include <hugo/invalid.h> |
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10 | #include <hugo/skeletons/maps.h> |
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11 | |
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12 | /// The namespace of HugoLib |
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13 | namespace hugo { |
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14 | namespace skeleton { |
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15 | |
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16 | /// \addtogroup skeletons |
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17 | /// @{ |
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18 | |
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19 | /// An empty static graph class. |
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20 | |
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21 | /// This class provides all the common features of a graph structure, |
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22 | /// however completely without implementations and real data structures |
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23 | /// behind the interface. |
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24 | /// All graph algorithms should compile with this class, but it will not |
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25 | /// run properly, of course. |
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26 | /// |
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27 | /// It can be used for checking the interface compatibility, |
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28 | /// or it can serve as a skeleton of a new graph structure. |
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29 | /// |
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30 | /// Also, you will find here the full documentation of a certain graph |
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31 | /// feature, the documentation of a real graph imlementation |
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32 | /// like @ref ListGraph or |
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33 | /// @ref SmartGraph will just refer to this structure. |
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34 | class StaticGraphSkeleton |
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35 | { |
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36 | public: |
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37 | /// Defalult constructor. |
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38 | |
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39 | /// Defalult constructor. |
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40 | /// |
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41 | StaticGraphSkeleton() { } |
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42 | ///Copy consructor. |
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43 | |
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44 | // ///\todo It is not clear, what we expect from a copy constructor. |
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45 | // ///E.g. How to assign the nodes/edges to each other? What about maps? |
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46 | // StaticGraphSkeleton(const StaticGraphSkeleton& g) { } |
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47 | |
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48 | /// The base type of node iterators, |
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49 | /// or in other words, the trivial node iterator. |
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50 | |
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51 | /// This is the base type of each node iterator, |
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52 | /// thus each kind of node iterator converts to this. |
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53 | /// More precisely each kind of node iterator should be inherited |
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54 | /// from the trivial node iterator. |
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55 | class Node { |
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56 | public: |
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57 | /// Default constructor |
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58 | |
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59 | /// @warning The default constructor sets the iterator |
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60 | /// to an undefined value. |
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61 | Node() { } |
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62 | /// Copy constructor. |
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63 | |
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64 | /// Copy constructor. |
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65 | /// |
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66 | Node(const Node&) { } |
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67 | |
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68 | /// Invalid constructor \& conversion. |
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69 | |
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70 | /// This constructor initializes the iterator to be invalid. |
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71 | /// \sa Invalid for more details. |
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72 | Node(Invalid) { } |
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73 | /// Equality operator |
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74 | |
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75 | /// Two iterators are equal if and only if they point to the |
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76 | /// same object or both are invalid. |
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77 | bool operator==(Node) const { return true; } |
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78 | |
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79 | /// Inequality operator |
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80 | |
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81 | /// \sa \ref operator==(Node n) |
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82 | /// |
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83 | bool operator!=(Node) const { return true; } |
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84 | |
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85 | ///Comparison operator. |
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86 | |
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87 | ///This is a strict ordering between the nodes. |
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88 | /// |
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89 | ///This ordering can be different from the order in which NodeIt |
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90 | ///goes through the nodes. |
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91 | ///\todo Possibly we don't need it. |
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92 | bool operator<(Node) const { return true; } |
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93 | }; |
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94 | |
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95 | /// This iterator goes through each node. |
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96 | |
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97 | /// This iterator goes through each node. |
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98 | /// Its usage is quite simple, for example you can count the number |
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99 | /// of nodes in graph \c g of type \c Graph like this: |
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100 | /// \code |
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101 | /// int count=0; |
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102 | /// for (Graph::NodeIt n(g); n!=INVALID; ++n) ++count; |
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103 | /// \endcode |
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104 | class NodeIt : public Node { |
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105 | public: |
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106 | /// Default constructor |
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107 | |
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108 | /// @warning The default constructor sets the iterator |
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109 | /// to an undefined value. |
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110 | NodeIt() { } |
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111 | /// Copy constructor. |
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112 | |
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113 | /// Copy constructor. |
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114 | /// |
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115 | NodeIt(const NodeIt&) { } |
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116 | /// Invalid constructor \& conversion. |
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117 | |
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118 | /// Initialize the iterator to be invalid. |
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119 | /// \sa Invalid for more details. |
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120 | NodeIt(Invalid) { } |
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121 | /// Sets the iterator to the first node. |
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122 | |
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123 | /// Sets the iterator to the first node of \c g. |
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124 | /// |
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125 | NodeIt(const StaticGraphSkeleton& g) { } |
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126 | /// Node -> NodeIt conversion. |
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127 | |
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128 | /// Sets the iterator to the node of \c g pointed by the trivial |
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129 | /// iterator n. |
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130 | /// This feature necessitates that each time we |
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131 | /// iterate the edge-set, the iteration order is the same. |
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132 | NodeIt(const StaticGraphSkeleton& g, const Node& n) { } |
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133 | /// Next node. |
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134 | |
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135 | /// Assign the iterator to the next node. |
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136 | /// |
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137 | NodeIt& operator++() { return *this; } |
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138 | }; |
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139 | |
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140 | |
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141 | /// The base type of the edge iterators. |
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142 | |
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143 | /// The base type of the edge iterators. |
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144 | /// |
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145 | class Edge { |
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146 | public: |
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147 | /// Default constructor |
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148 | |
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149 | /// @warning The default constructor sets the iterator |
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150 | /// to an undefined value. |
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151 | Edge() { } |
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152 | /// Copy constructor. |
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153 | |
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154 | /// Copy constructor. |
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155 | /// |
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156 | Edge(const Edge&) { } |
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157 | /// Initialize the iterator to be invalid. |
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158 | |
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159 | /// Initialize the iterator to be invalid. |
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160 | /// |
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161 | Edge(Invalid) { } |
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162 | /// Equality operator |
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163 | |
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164 | /// Two iterators are equal if and only if they point to the |
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165 | /// same object or both are invalid. |
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166 | bool operator==(Edge) const { return true; } |
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167 | /// Inequality operator |
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168 | |
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169 | /// \sa \ref operator==(Node n) |
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170 | /// |
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171 | bool operator!=(Edge) const { return true; } |
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172 | ///Comparison operator. |
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173 | |
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174 | ///This is a strict ordering between the nodes. |
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175 | /// |
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176 | ///This ordering can be different from the order in which NodeIt |
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177 | ///goes through the nodes. |
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178 | ///\todo Possibly we don't need it. |
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179 | bool operator<(Edge) const { return true; } |
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180 | }; |
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181 | |
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182 | /// This iterator goes trough the outgoing edges of a node. |
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183 | |
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184 | /// This iterator goes trough the \e outgoing edges of a certain node |
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185 | /// of a graph. |
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186 | /// Its usage is quite simple, for example you can count the number |
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187 | /// of outgoing edges of a node \c n |
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188 | /// in graph \c g of type \c Graph as follows. |
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189 | /// \code |
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190 | /// int count=0; |
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191 | /// for (Graph::OutEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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192 | /// \endcode |
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193 | |
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194 | class OutEdgeIt : public Edge { |
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195 | public: |
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196 | /// Default constructor |
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197 | |
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198 | /// @warning The default constructor sets the iterator |
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199 | /// to an undefined value. |
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200 | OutEdgeIt() { } |
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201 | /// Copy constructor. |
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202 | |
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203 | /// Copy constructor. |
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204 | /// |
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205 | OutEdgeIt(const OutEdgeIt&) { } |
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206 | /// Initialize the iterator to be invalid. |
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207 | |
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208 | /// Initialize the iterator to be invalid. |
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209 | /// |
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210 | OutEdgeIt(Invalid) { } |
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211 | /// This constructor sets the iterator to first outgoing edge. |
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212 | |
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213 | /// This constructor set the iterator to the first outgoing edge of |
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214 | /// node |
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215 | ///@param n the node |
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216 | ///@param g the graph |
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217 | OutEdgeIt(const StaticGraphSkeleton& g, const Node& n) { } |
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218 | /// Edge -> OutEdgeIt conversion |
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219 | |
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220 | /// Sets the iterator to the value of the trivial iterator \c e. |
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221 | /// This feature necessitates that each time we |
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222 | /// iterate the edge-set, the iteration order is the same. |
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223 | OutEdgeIt(const StaticGraphSkeleton& g, const Edge& e) { } |
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224 | ///Next outgoing edge |
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225 | |
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226 | /// Assign the iterator to the next |
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227 | /// outgoing edge of the corresponding node. |
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228 | OutEdgeIt& operator++() { return *this; } |
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229 | }; |
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230 | |
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231 | /// This iterator goes trough the incoming edges of a node. |
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232 | |
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233 | /// This iterator goes trough the \e incoming edges of a certain node |
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234 | /// of a graph. |
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235 | /// Its usage is quite simple, for example you can count the number |
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236 | /// of outgoing edges of a node \c n |
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237 | /// in graph \c g of type \c Graph as follows. |
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238 | /// \code |
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239 | /// int count=0; |
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240 | /// for(Graph::InEdgeIt e(g, n); e!=INVALID; ++e) ++count; |
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241 | /// \endcode |
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242 | |
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243 | class InEdgeIt : public Edge { |
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244 | public: |
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245 | /// Default constructor |
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246 | |
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247 | /// @warning The default constructor sets the iterator |
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248 | /// to an undefined value. |
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249 | InEdgeIt() { } |
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250 | /// Copy constructor. |
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251 | |
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252 | /// Copy constructor. |
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253 | /// |
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254 | InEdgeIt(const InEdgeIt&) { } |
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255 | /// Initialize the iterator to be invalid. |
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256 | |
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257 | /// Initialize the iterator to be invalid. |
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258 | /// |
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259 | InEdgeIt(Invalid) { } |
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260 | /// This constructor sets the iterator to first incoming edge. |
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261 | |
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262 | /// This constructor set the iterator to the first incoming edge of |
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263 | /// node |
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264 | ///@param n the node |
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265 | ///@param g the graph |
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266 | InEdgeIt(const StaticGraphSkeleton& g, const Node& n) { } |
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267 | /// Edge -> InEdgeIt conversion |
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268 | |
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269 | /// Sets the iterator to the value of the trivial iterator \c e. |
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270 | /// This feature necessitates that each time we |
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271 | /// iterate the edge-set, the iteration order is the same. |
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272 | InEdgeIt(const StaticGraphSkeleton& g, const Edge& n) { } |
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273 | /// Next incoming edge |
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274 | |
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275 | /// Assign the iterator to the next inedge of the corresponding node. |
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276 | /// |
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277 | InEdgeIt& operator++() { return *this; } |
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278 | }; |
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279 | /// This iterator goes through each edge. |
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280 | |
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281 | /// This iterator goes through each edge of a graph. |
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282 | /// Its usage is quite simple, for example you can count the number |
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283 | /// of edges in a graph \c g of type \c Graph as follows: |
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284 | /// \code |
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285 | /// int count=0; |
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286 | /// for(Graph::EdgeIt e(g); e!=INVALID; ++e) ++count; |
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287 | /// \endcode |
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288 | class EdgeIt : public Edge { |
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289 | public: |
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290 | /// Default constructor |
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291 | |
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292 | /// @warning The default constructor sets the iterator |
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293 | /// to an undefined value. |
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294 | EdgeIt() { } |
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295 | /// Copy constructor. |
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296 | |
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297 | /// Copy constructor. |
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298 | /// |
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299 | EdgeIt(const EdgeIt&) { } |
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300 | /// Initialize the iterator to be invalid. |
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301 | |
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302 | /// Initialize the iterator to be invalid. |
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303 | /// |
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304 | EdgeIt(Invalid) { } |
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305 | /// This constructor sets the iterator to first edge. |
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306 | |
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307 | /// This constructor set the iterator to the first edge of |
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308 | /// node |
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309 | ///@param g the graph |
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310 | EdgeIt(const StaticGraphSkeleton& g) { } |
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311 | /// Edge -> EdgeIt conversion |
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312 | |
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313 | /// Sets the iterator to the value of the trivial iterator \c e. |
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314 | /// This feature necessitates that each time we |
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315 | /// iterate the edge-set, the iteration order is the same. |
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316 | EdgeIt(const StaticGraphSkeleton&, const Edge&) { } |
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317 | ///Next edge |
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318 | |
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319 | /// Assign the iterator to the next |
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320 | /// edge of the corresponding node. |
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321 | EdgeIt& operator++() { return *this; } |
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322 | }; |
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323 | |
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324 | /// First node of the graph. |
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325 | |
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326 | /// \retval i the first node. |
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327 | /// \return the first node. |
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328 | /// |
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329 | NodeIt& first(NodeIt& i) const { return i; } |
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330 | |
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331 | /// The first incoming edge. |
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332 | |
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333 | /// The first incoming edge. |
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334 | /// |
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335 | InEdgeIt& first(InEdgeIt &i, Node) const { return i; } |
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336 | /// The first outgoing edge. |
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337 | |
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338 | /// The first outgoing edge. |
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339 | /// |
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340 | OutEdgeIt& first(OutEdgeIt& i, Node) const { return i; } |
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341 | /// The first edge of the Graph. |
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342 | |
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343 | /// The first edge of the Graph. |
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344 | /// |
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345 | EdgeIt& first(EdgeIt& i) const { return i; } |
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346 | |
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347 | ///Gives back the head node of an edge. |
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348 | |
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349 | ///Gives back the head node of an edge. |
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350 | /// |
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351 | Node head(Edge) const { return INVALID; } |
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352 | ///Gives back the tail node of an edge. |
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353 | |
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354 | ///Gives back the tail node of an edge. |
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355 | /// |
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356 | Node tail(Edge) const { return INVALID; } |
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357 | |
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358 | ///Gives back the \e id of a node. |
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359 | |
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360 | ///\warning Not all graph structures provide this feature. |
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361 | /// |
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362 | ///\todo Should each graph provide \c id? |
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363 | int id(const Node&) const { return 0; } |
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364 | ///Gives back the \e id of an edge. |
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365 | |
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366 | ///\warning Not all graph structures provide this feature. |
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367 | /// |
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368 | ///\todo Should each graph provide \c id? |
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369 | int id(const Edge&) const { return 0; } |
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370 | |
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371 | /// . |
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372 | |
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373 | ///\todo What is this? |
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374 | /// |
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375 | int nodeNum() const { return 0; } |
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376 | /// . |
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377 | ///\todo What is this? |
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378 | /// |
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379 | int edgeNum() const { return 0; } |
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380 | |
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381 | |
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382 | ///Reference map of the nodes to type \c T. |
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383 | |
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384 | ///Reference map of the nodes to type \c T. |
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385 | /// \sa ReferenceSkeleton |
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386 | /// \warning Making maps that can handle bool type (NodeMap<bool>) |
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387 | /// needs some extra attention! |
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388 | template<class T> class NodeMap: public ReferenceMap< Node, T > |
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389 | { |
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390 | public: |
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391 | |
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392 | /// . |
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393 | NodeMap(const StaticGraphSkeleton&) { } |
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394 | /// . |
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395 | NodeMap(const StaticGraphSkeleton&, T) { } |
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396 | |
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397 | ///Copy constructor |
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398 | template<typename TT> NodeMap(const NodeMap<TT>&) { } |
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399 | ///Assignment operator |
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400 | template<typename TT> NodeMap& operator=(const NodeMap<TT>&) |
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401 | { return *this; } |
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402 | }; |
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403 | |
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404 | ///Reference map of the edges to type \c T. |
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405 | |
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406 | ///Reference map of the edges to type \c T. |
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407 | /// \sa ReferenceSkeleton |
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408 | /// \warning Making maps that can handle bool type (EdgeMap<bool>) |
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409 | /// needs some extra attention! |
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410 | template<class T> class EdgeMap |
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411 | : public ReferenceMap<Edge,T> |
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412 | { |
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413 | public: |
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414 | |
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415 | /// . |
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416 | EdgeMap(const StaticGraphSkeleton&) { } |
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417 | /// . |
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418 | EdgeMap(const StaticGraphSkeleton&, T) { } |
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419 | |
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420 | ///Copy constructor |
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421 | template<typename TT> EdgeMap(const EdgeMap<TT>&) { } |
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422 | ///Assignment operator |
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423 | template<typename TT> EdgeMap &operator=(const EdgeMap<TT>&) |
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424 | { return *this; } |
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425 | }; |
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426 | }; |
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427 | |
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428 | |
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429 | |
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430 | /// An empty non-static graph class. |
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431 | |
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432 | /// This class provides everything that \c StaticGraphSkeleton |
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433 | /// with additional functionality which enables to build a |
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434 | /// graph from scratch. |
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435 | class ExtendableGraphSkeleton : public StaticGraphSkeleton |
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436 | { |
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437 | public: |
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438 | /// Defalult constructor. |
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439 | |
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440 | /// Defalult constructor. |
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441 | /// |
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442 | ExtendableGraphSkeleton() { } |
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443 | ///Add a new node to the graph. |
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444 | |
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445 | /// \return the new node. |
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446 | /// |
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447 | Node addNode() { return INVALID; } |
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448 | ///Add a new edge to the graph. |
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449 | |
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450 | ///Add a new edge to the graph with tail node \c tail |
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451 | ///and head node \c head. |
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452 | ///\return the new edge. |
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453 | Edge addEdge(Node, Node) { return INVALID; } |
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454 | |
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455 | /// Resets the graph. |
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456 | |
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457 | /// This function deletes all edges and nodes of the graph. |
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458 | /// It also frees the memory allocated to store them. |
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459 | /// \todo It might belong to \c ErasableGraphSkeleton. |
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460 | void clear() { } |
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461 | }; |
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462 | |
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463 | /// An empty erasable graph class. |
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464 | |
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465 | /// This class is an extension of \c GraphSkeleton. It also makes it |
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466 | /// possible to erase edges or nodes. |
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467 | class ErasableGraphSkeleton : public ExtendableGraphSkeleton |
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468 | { |
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469 | public: |
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470 | /// Defalult constructor. |
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471 | |
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472 | /// Defalult constructor. |
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473 | /// |
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474 | ErasableGraphSkeleton() { } |
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475 | /// Deletes a node. |
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476 | |
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477 | /// Deletes node \c n node. |
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478 | /// |
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479 | void erase(Node n) { } |
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480 | /// Deletes an edge. |
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481 | |
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482 | /// Deletes edge \c e edge. |
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483 | /// |
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484 | void erase(Edge e) { } |
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485 | }; |
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486 | |
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487 | // @} |
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488 | } //namespace skeleton |
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489 | } //namespace hugo |
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490 | |
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491 | |
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492 | |
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493 | #endif // HUGO_SKELETON_GRAPH_H |
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