1 | #ifndef BFS_ITERATOR_HH |
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2 | #define BFS_ITERATOR_HH |
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3 | |
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4 | #include <queue> |
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5 | #include <stack> |
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6 | #include <utility> |
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7 | #include <graph_wrapper.h> |
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8 | |
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9 | namespace marci { |
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10 | |
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11 | template <typename Graph> |
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12 | struct bfs { |
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13 | typedef typename Graph::NodeIt NodeIt; |
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14 | typedef typename Graph::EdgeIt EdgeIt; |
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15 | typedef typename Graph::EachNodeIt EachNodeIt; |
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16 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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17 | Graph& G; |
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18 | NodeIt s; |
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19 | typename Graph::NodeMap<bool> reached; |
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20 | typename Graph::NodeMap<EdgeIt> pred; |
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21 | typename Graph::NodeMap<int> dist; |
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22 | std::queue<NodeIt> bfs_queue; |
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23 | bfs(Graph& _G, NodeIt _s) : G(_G), s(_s), reached(_G), pred(_G), dist(_G) { |
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24 | bfs_queue.push(s); |
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25 | for(EachNodeIt i=G.template first<EachNodeIt>(); i.valid(); ++i) |
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26 | reached.set(i, false); |
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27 | reached.set(s, true); |
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28 | dist.set(s, 0); |
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29 | } |
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30 | |
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31 | void run() { |
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32 | while (!bfs_queue.empty()) { |
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33 | NodeIt v=bfs_queue.front(); |
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34 | OutEdgeIt e=G.template first<OutEdgeIt>(v); |
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35 | bfs_queue.pop(); |
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36 | for( ; e.valid(); ++e) { |
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37 | NodeIt w=G.bNode(e); |
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38 | std::cout << "scan node " << G.id(w) << " from node " << G.id(v) << std::endl; |
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39 | if (!reached.get(w)) { |
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40 | std::cout << G.id(w) << " is newly reached :-)" << std::endl; |
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41 | bfs_queue.push(w); |
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42 | dist.set(w, dist.get(v)+1); |
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43 | pred.set(w, e); |
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44 | reached.set(w, true); |
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45 | } else { |
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46 | std::cout << G.id(w) << " is already reached" << std::endl; |
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47 | } |
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48 | } |
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49 | } |
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50 | } |
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51 | }; |
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52 | |
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53 | template <typename Graph> |
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54 | struct bfs_visitor { |
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55 | typedef typename Graph::NodeIt NodeIt; |
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56 | typedef typename Graph::EdgeIt EdgeIt; |
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57 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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58 | Graph& G; |
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59 | bfs_visitor(Graph& _G) : G(_G) { } |
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60 | void at_previously_reached(OutEdgeIt& e) { |
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61 | //NodeIt v=G.aNode(e); |
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62 | NodeIt w=G.bNode(e); |
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63 | std::cout << G.id(w) << " is already reached" << std::endl; |
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64 | } |
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65 | void at_newly_reached(OutEdgeIt& e) { |
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66 | //NodeIt v=G.aNode(e); |
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67 | NodeIt w=G.bNode(e); |
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68 | std::cout << G.id(w) << " is newly reached :-)" << std::endl; |
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69 | } |
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70 | }; |
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71 | |
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72 | template <typename Graph, typename ReachedMap, typename visitor_type> |
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73 | struct bfs_iterator { |
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74 | typedef typename Graph::NodeIt NodeIt; |
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75 | typedef typename Graph::EdgeIt EdgeIt; |
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76 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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77 | Graph& G; |
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78 | std::queue<OutEdgeIt>& bfs_queue; |
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79 | ReachedMap& reached; |
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80 | visitor_type& visitor; |
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81 | void process() { |
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82 | while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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83 | if (bfs_queue.empty()) return; |
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84 | OutEdgeIt e=bfs_queue.front(); |
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85 | //NodeIt v=G.aNode(e); |
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86 | NodeIt w=G.bNode(e); |
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87 | if (!reached.get(w)) { |
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88 | visitor.at_newly_reached(e); |
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89 | bfs_queue.push(G.template first<OutEdgeIt>(w)); |
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90 | reached.set(w, true); |
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91 | } else { |
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92 | visitor.at_previously_reached(e); |
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93 | } |
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94 | } |
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95 | bfs_iterator(Graph& _G, std::queue<OutEdgeIt>& _bfs_queue, ReachedMap& _reached, visitor_type& _visitor) : G(_G), bfs_queue(_bfs_queue), reached(_reached), visitor(_visitor) { |
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96 | //while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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97 | valid(); |
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98 | } |
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99 | bfs_iterator<Graph, ReachedMap, visitor_type>& operator++() { |
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100 | //while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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101 | //if (bfs_queue.empty()) return *this; |
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102 | if (!valid()) return *this; |
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103 | ++(bfs_queue.front()); |
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104 | //while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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105 | valid(); |
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106 | return *this; |
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107 | } |
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108 | //void next() { |
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109 | // while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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110 | // if (bfs_queue.empty()) return; |
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111 | // ++(bfs_queue.front()); |
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112 | // while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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113 | //} |
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114 | bool valid() { |
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115 | while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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116 | if (bfs_queue.empty()) return false; else return true; |
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117 | } |
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118 | //bool finished() { |
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119 | // while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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120 | // if (bfs_queue.empty()) return true; else return false; |
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121 | //} |
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122 | operator EdgeIt () { return bfs_queue.front(); } |
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123 | |
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124 | }; |
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125 | |
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126 | template <typename Graph, typename ReachedMap> |
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127 | struct bfs_iterator1 { |
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128 | typedef typename Graph::NodeIt NodeIt; |
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129 | typedef typename Graph::EdgeIt EdgeIt; |
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130 | typedef typename Graph::OutEdgeIt OutEdgeIt; |
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131 | Graph& G; |
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132 | std::queue<OutEdgeIt>& bfs_queue; |
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133 | ReachedMap& reached; |
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134 | bool _newly_reached; |
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135 | bfs_iterator1(Graph& _G, std::queue<OutEdgeIt>& _bfs_queue, ReachedMap& _reached) : G(_G), bfs_queue(_bfs_queue), reached(_reached) { |
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136 | valid(); |
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137 | if (!bfs_queue.empty() && bfs_queue.front().valid()) { |
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138 | OutEdgeIt e=bfs_queue.front(); |
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139 | NodeIt w=G.bNode(e); |
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140 | if (!reached.get(w)) { |
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141 | bfs_queue.push(G.template first<OutEdgeIt>(w)); |
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142 | reached.set(w, true); |
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143 | _newly_reached=true; |
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144 | } else { |
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145 | _newly_reached=false; |
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146 | } |
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147 | } |
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148 | } |
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149 | bfs_iterator1<Graph, ReachedMap>& operator++() { |
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150 | if (!valid()) return *this; |
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151 | ++(bfs_queue.front()); |
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152 | valid(); |
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153 | if (!bfs_queue.empty() && bfs_queue.front().valid()) { |
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154 | OutEdgeIt e=bfs_queue.front(); |
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155 | NodeIt w=G.bNode(e); |
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156 | if (!reached.get(w)) { |
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157 | bfs_queue.push(G.template first<OutEdgeIt>(w)); |
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158 | reached.set(w, true); |
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159 | _newly_reached=true; |
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160 | } else { |
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161 | _newly_reached=false; |
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162 | } |
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163 | } |
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164 | return *this; |
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165 | } |
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166 | bool valid() { |
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167 | while ( !bfs_queue.empty() && !bfs_queue.front().valid() ) { bfs_queue.pop(); } |
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168 | if (bfs_queue.empty()) return false; else return true; |
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169 | } |
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170 | operator OutEdgeIt() { return bfs_queue.front(); } |
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171 | //ize |
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172 | bool newly_reached() { return _newly_reached; } |
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173 | |
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174 | }; |
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175 | |
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176 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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177 | struct BfsIterator { |
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178 | typedef typename Graph::NodeIt NodeIt; |
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179 | Graph& G; |
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180 | std::queue<OutEdgeIt>& bfs_queue; |
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181 | ReachedMap& reached; |
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182 | bool b_node_newly_reached; |
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183 | OutEdgeIt actual_edge; |
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184 | BfsIterator(Graph& _G, |
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185 | std::queue<OutEdgeIt>& _bfs_queue, |
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186 | ReachedMap& _reached) : |
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187 | G(_G), bfs_queue(_bfs_queue), reached(_reached) { |
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188 | actual_edge=bfs_queue.front(); |
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189 | if (actual_edge.valid()) { |
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190 | NodeIt w=G.bNode(actual_edge); |
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191 | if (!reached.get(w)) { |
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192 | bfs_queue.push(G.firstOutEdge(w)); |
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193 | reached.set(w, true); |
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194 | b_node_newly_reached=true; |
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195 | } else { |
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196 | b_node_newly_reached=false; |
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197 | } |
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198 | } |
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199 | } |
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200 | BfsIterator<Graph, OutEdgeIt, ReachedMap>& |
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201 | operator++() { |
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202 | if (bfs_queue.front().valid()) { |
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203 | ++(bfs_queue.front()); |
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204 | actual_edge=bfs_queue.front(); |
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205 | if (actual_edge.valid()) { |
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206 | NodeIt w=G.bNode(actual_edge); |
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207 | if (!reached.get(w)) { |
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208 | bfs_queue.push(G.firstOutEdge(w)); |
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209 | reached.set(w, true); |
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210 | b_node_newly_reached=true; |
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211 | } else { |
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212 | b_node_newly_reached=false; |
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213 | } |
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214 | } |
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215 | } else { |
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216 | bfs_queue.pop(); |
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217 | actual_edge=bfs_queue.front(); |
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218 | if (actual_edge.valid()) { |
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219 | NodeIt w=G.bNode(actual_edge); |
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220 | if (!reached.get(w)) { |
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221 | bfs_queue.push(G.firstOutEdge(w)); |
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222 | reached.set(w, true); |
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223 | b_node_newly_reached=true; |
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224 | } else { |
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225 | b_node_newly_reached=false; |
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226 | } |
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227 | } |
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228 | } |
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229 | return *this; |
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230 | } |
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231 | bool finished() { return bfs_queue.empty(); } |
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232 | operator OutEdgeIt () { return actual_edge; } |
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233 | bool bNodeIsNewlyReached() { return b_node_newly_reached; } |
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234 | bool aNodeIsExamined() { return !(actual_edge.valid()); } |
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235 | }; |
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236 | |
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237 | |
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238 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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239 | struct DfsIterator { |
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240 | typedef typename Graph::NodeIt NodeIt; |
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241 | Graph& G; |
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242 | std::stack<OutEdgeIt>& bfs_queue; |
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243 | ReachedMap& reached; |
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244 | bool b_node_newly_reached; |
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245 | OutEdgeIt actual_edge; |
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246 | DfsIterator(Graph& _G, |
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247 | std::stack<OutEdgeIt>& _bfs_queue, |
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248 | ReachedMap& _reached) : |
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249 | G(_G), bfs_queue(_bfs_queue), reached(_reached) { |
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250 | actual_edge=bfs_queue.top(); |
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251 | if (actual_edge.valid()) { |
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252 | NodeIt w=G.bNode(actual_edge); |
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253 | if (!reached.get(w)) { |
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254 | bfs_queue.push(G.firstOutEdge(w)); |
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255 | reached.set(w, true); |
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256 | b_node_newly_reached=true; |
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257 | } else { |
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258 | ++(bfs_queue.top()); |
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259 | b_node_newly_reached=false; |
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260 | } |
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261 | } else { |
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262 | bfs_queue.pop(); |
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263 | } |
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264 | } |
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265 | DfsIterator<Graph, OutEdgeIt, ReachedMap>& |
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266 | operator++() { |
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267 | actual_edge=bfs_queue.top(); |
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268 | if (actual_edge.valid()) { |
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269 | NodeIt w=G.bNode(actual_edge); |
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270 | if (!reached.get(w)) { |
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271 | bfs_queue.push(G.firstOutEdge(w)); |
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272 | reached.set(w, true); |
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273 | b_node_newly_reached=true; |
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274 | } else { |
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275 | ++(bfs_queue.top()); |
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276 | b_node_newly_reached=false; |
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277 | } |
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278 | } else { |
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279 | bfs_queue.pop(); |
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280 | } |
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281 | return *this; |
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282 | } |
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283 | bool finished() { return bfs_queue.empty(); } |
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284 | operator OutEdgeIt () { return actual_edge; } |
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285 | bool bNodeIsNewlyReached() { return b_node_newly_reached; } |
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286 | bool aNodeIsExamined() { return !(actual_edge.valid()); } |
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287 | }; |
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288 | |
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289 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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290 | struct BfsIterator1 { |
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291 | typedef typename Graph::NodeIt NodeIt; |
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292 | Graph& G; |
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293 | std::queue<OutEdgeIt>& bfs_queue; |
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294 | ReachedMap& reached; |
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295 | bool b_node_newly_reached; |
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296 | OutEdgeIt actual_edge; |
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297 | BfsIterator1(Graph& _G, |
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298 | std::queue<OutEdgeIt>& _bfs_queue, |
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299 | ReachedMap& _reached) : |
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300 | G(_G), bfs_queue(_bfs_queue), reached(_reached) { |
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301 | actual_edge=bfs_queue.front(); |
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302 | if (actual_edge.valid()) { |
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303 | NodeIt w=G.bNode(actual_edge); |
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304 | if (!reached.get(w)) { |
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305 | bfs_queue.push(OutEdgeIt(G, w)); |
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306 | reached.set(w, true); |
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307 | b_node_newly_reached=true; |
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308 | } else { |
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309 | b_node_newly_reached=false; |
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310 | } |
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311 | } |
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312 | } |
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313 | void next() { |
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314 | if (bfs_queue.front().valid()) { |
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315 | ++(bfs_queue.front()); |
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316 | actual_edge=bfs_queue.front(); |
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317 | if (actual_edge.valid()) { |
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318 | NodeIt w=G.bNode(actual_edge); |
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319 | if (!reached.get(w)) { |
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320 | bfs_queue.push(OutEdgeIt(G, w)); |
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321 | reached.set(w, true); |
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322 | b_node_newly_reached=true; |
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323 | } else { |
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324 | b_node_newly_reached=false; |
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325 | } |
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326 | } |
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327 | } else { |
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328 | bfs_queue.pop(); |
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329 | actual_edge=bfs_queue.front(); |
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330 | if (actual_edge.valid()) { |
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331 | NodeIt w=G.bNode(actual_edge); |
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332 | if (!reached.get(w)) { |
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333 | bfs_queue.push(OutEdgeIt(G, w)); |
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334 | reached.set(w, true); |
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335 | b_node_newly_reached=true; |
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336 | } else { |
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337 | b_node_newly_reached=false; |
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338 | } |
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339 | } |
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340 | } |
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341 | //return *this; |
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342 | } |
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343 | bool finished() { return bfs_queue.empty(); } |
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344 | operator OutEdgeIt () { return actual_edge; } |
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345 | bool bNodeIsNewlyReached() { return b_node_newly_reached; } |
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346 | bool aNodeIsExamined() { return !(actual_edge.valid()); } |
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347 | }; |
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348 | |
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349 | |
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350 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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351 | struct DfsIterator1 { |
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352 | typedef typename Graph::NodeIt NodeIt; |
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353 | Graph& G; |
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354 | std::stack<OutEdgeIt>& bfs_queue; |
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355 | ReachedMap& reached; |
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356 | bool b_node_newly_reached; |
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357 | OutEdgeIt actual_edge; |
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358 | DfsIterator1(Graph& _G, |
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359 | std::stack<OutEdgeIt>& _bfs_queue, |
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360 | ReachedMap& _reached) : |
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361 | G(_G), bfs_queue(_bfs_queue), reached(_reached) { |
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362 | //actual_edge=bfs_queue.top(); |
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363 | //if (actual_edge.valid()) { |
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364 | // NodeIt w=G.bNode(actual_edge); |
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365 | //if (!reached.get(w)) { |
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366 | // bfs_queue.push(OutEdgeIt(G, w)); |
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367 | // reached.set(w, true); |
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368 | // b_node_newly_reached=true; |
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369 | //} else { |
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370 | // ++(bfs_queue.top()); |
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371 | // b_node_newly_reached=false; |
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372 | //} |
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373 | //} else { |
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374 | // bfs_queue.pop(); |
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375 | //} |
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376 | } |
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377 | void next() { |
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378 | actual_edge=bfs_queue.top(); |
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379 | if (actual_edge.valid()) { |
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380 | NodeIt w=G.bNode(actual_edge); |
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381 | if (!reached.get(w)) { |
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382 | bfs_queue.push(OutEdgeIt(G, w)); |
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383 | reached.set(w, true); |
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384 | b_node_newly_reached=true; |
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385 | } else { |
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386 | ++(bfs_queue.top()); |
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387 | b_node_newly_reached=false; |
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388 | } |
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389 | } else { |
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390 | bfs_queue.pop(); |
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391 | } |
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392 | //return *this; |
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393 | } |
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394 | bool finished() { return bfs_queue.empty(); } |
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395 | operator OutEdgeIt () { return actual_edge; } |
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396 | bool bNodeIsNewlyReached() { return b_node_newly_reached; } |
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397 | bool aNodeIsLeaved() { return !(actual_edge.valid()); } |
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398 | }; |
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399 | |
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400 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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401 | class BfsIterator2 { |
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402 | typedef typename Graph::NodeIt NodeIt; |
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403 | const Graph& G; |
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404 | std::queue<OutEdgeIt> bfs_queue; |
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405 | ReachedMap reached; |
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406 | bool b_node_newly_reached; |
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407 | OutEdgeIt actual_edge; |
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408 | public: |
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409 | BfsIterator2(const Graph& _G) : G(_G), reached(G, false) { } |
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410 | void pushAndSetReached(NodeIt s) { |
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411 | reached.set(s, true); |
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412 | if (bfs_queue.empty()) { |
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413 | bfs_queue.push(G.template first<OutEdgeIt>(s)); |
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414 | actual_edge=bfs_queue.front(); |
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415 | if (actual_edge.valid()) { |
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416 | NodeIt w=G.bNode(actual_edge); |
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417 | if (!reached.get(w)) { |
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418 | bfs_queue.push(G.template first<OutEdgeIt>(w)); |
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419 | reached.set(w, true); |
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420 | b_node_newly_reached=true; |
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421 | } else { |
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422 | b_node_newly_reached=false; |
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423 | } |
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424 | } //else { |
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425 | //} |
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426 | } else { |
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427 | bfs_queue.push(G.template first<OutEdgeIt>(s)); |
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428 | } |
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429 | } |
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430 | BfsIterator2<Graph, OutEdgeIt, ReachedMap>& |
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431 | operator++() { |
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432 | if (bfs_queue.front().valid()) { |
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433 | ++(bfs_queue.front()); |
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434 | actual_edge=bfs_queue.front(); |
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435 | if (actual_edge.valid()) { |
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436 | NodeIt w=G.bNode(actual_edge); |
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437 | if (!reached.get(w)) { |
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438 | bfs_queue.push(G.template first<OutEdgeIt>(w)); |
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439 | reached.set(w, true); |
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440 | b_node_newly_reached=true; |
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441 | } else { |
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442 | b_node_newly_reached=false; |
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443 | } |
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444 | } |
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445 | } else { |
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446 | bfs_queue.pop(); |
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447 | if (!bfs_queue.empty()) { |
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448 | actual_edge=bfs_queue.front(); |
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449 | if (actual_edge.valid()) { |
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450 | NodeIt w=G.bNode(actual_edge); |
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451 | if (!reached.get(w)) { |
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452 | bfs_queue.push(G.template first<OutEdgeIt>(w)); |
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453 | reached.set(w, true); |
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454 | b_node_newly_reached=true; |
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455 | } else { |
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456 | b_node_newly_reached=false; |
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457 | } |
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458 | } |
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459 | } |
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460 | } |
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461 | return *this; |
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462 | } |
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463 | bool finished() const { return bfs_queue.empty(); } |
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464 | operator OutEdgeIt () const { return actual_edge; } |
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465 | bool isBNodeNewlyReached() const { return b_node_newly_reached; } |
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466 | bool isANodeExamined() const { return !(actual_edge.valid()); } |
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467 | const ReachedMap& getReachedMap() const { return reached; } |
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468 | const std::queue<OutEdgeIt>& getBfsQueue() const { return bfs_queue; } |
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469 | }; |
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470 | |
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471 | |
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472 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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473 | class BfsIterator3 { |
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474 | typedef typename Graph::NodeIt NodeIt; |
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475 | const Graph& G; |
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476 | std::queue< std::pair<NodeIt, OutEdgeIt> > bfs_queue; |
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477 | ReachedMap reached; |
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478 | bool b_node_newly_reached; |
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479 | OutEdgeIt actual_edge; |
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480 | public: |
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481 | BfsIterator3(const Graph& _G) : G(_G), reached(G, false) { } |
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482 | void pushAndSetReached(NodeIt s) { |
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483 | reached.set(s, true); |
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484 | if (bfs_queue.empty()) { |
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485 | bfs_queue.push(std::pair<NodeIt, OutEdgeIt>(s, G.template first<OutEdgeIt>(s))); |
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486 | actual_edge=bfs_queue.front().second; |
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487 | if (actual_edge.valid()) { |
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488 | NodeIt w=G.bNode(actual_edge); |
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489 | if (!reached.get(w)) { |
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490 | bfs_queue.push(std::pair<NodeIt, OutEdgeIt>(w, G.template first<OutEdgeIt>(w))); |
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491 | reached.set(w, true); |
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492 | b_node_newly_reached=true; |
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493 | } else { |
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494 | b_node_newly_reached=false; |
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495 | } |
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496 | } //else { |
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497 | //} |
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498 | } else { |
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499 | bfs_queue.push(std::pair<NodeIt, OutEdgeIt>(s, G.template first<OutEdgeIt>(s))); |
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500 | } |
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501 | } |
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502 | BfsIterator3<Graph, OutEdgeIt, ReachedMap>& |
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503 | operator++() { |
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504 | if (bfs_queue.front().second.valid()) { |
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505 | ++(bfs_queue.front().second); |
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506 | actual_edge=bfs_queue.front().second; |
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507 | if (actual_edge.valid()) { |
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508 | NodeIt w=G.bNode(actual_edge); |
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509 | if (!reached.get(w)) { |
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510 | bfs_queue.push(std::pair<NodeIt, OutEdgeIt>(w, G.template first<OutEdgeIt>(w))); |
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511 | reached.set(w, true); |
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512 | b_node_newly_reached=true; |
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513 | } else { |
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514 | b_node_newly_reached=false; |
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515 | } |
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516 | } |
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517 | } else { |
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518 | bfs_queue.pop(); |
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519 | if (!bfs_queue.empty()) { |
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520 | actual_edge=bfs_queue.front().second; |
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521 | if (actual_edge.valid()) { |
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522 | NodeIt w=G.bNode(actual_edge); |
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523 | if (!reached.get(w)) { |
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524 | bfs_queue.push(std::pair<NodeIt, OutEdgeIt>(w, G.template first<OutEdgeIt>(w))); |
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525 | reached.set(w, true); |
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526 | b_node_newly_reached=true; |
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527 | } else { |
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528 | b_node_newly_reached=false; |
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529 | } |
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530 | } |
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531 | } |
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532 | } |
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533 | return *this; |
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534 | } |
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535 | bool finished() const { return bfs_queue.empty(); } |
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536 | operator OutEdgeIt () const { return actual_edge; } |
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537 | bool isBNodeNewlyReached() const { return b_node_newly_reached; } |
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538 | bool isANodeExamined() const { return !(actual_edge.valid()); } |
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539 | NodeIt aNode() const { return bfs_queue.front().first; } |
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540 | NodeIt bNode() const { return G.bNode(actual_edge); } |
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541 | const ReachedMap& getReachedMap() const { return reached; } |
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542 | //const std::queue< std::pair<NodeIt, OutEdgeIt> >& getBfsQueue() const { return bfs_queue; } |
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543 | }; |
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544 | |
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545 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
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546 | class BfsIterator4 { |
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547 | typedef typename Graph::NodeIt NodeIt; |
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548 | const Graph& G; |
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549 | std::queue<NodeIt> bfs_queue; |
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550 | ReachedMap reached; |
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551 | bool b_node_newly_reached; |
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552 | OutEdgeIt actual_edge; |
---|
553 | public: |
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554 | BfsIterator4(const Graph& _G) : G(_G), reached(G, false) { } |
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555 | void pushAndSetReached(NodeIt s) { |
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556 | reached.set(s, true); |
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557 | if (bfs_queue.empty()) { |
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558 | bfs_queue.push(s); |
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559 | G.getFirst(actual_edge, s); |
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560 | if (actual_edge.valid()) { |
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561 | NodeIt w=G.bNode(actual_edge); |
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562 | if (!reached.get(w)) { |
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563 | bfs_queue.push(w); |
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564 | reached.set(w, true); |
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565 | b_node_newly_reached=true; |
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566 | } else { |
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567 | b_node_newly_reached=false; |
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568 | } |
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569 | } |
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570 | } else { |
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571 | bfs_queue.push(s); |
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572 | } |
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573 | } |
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574 | BfsIterator4<Graph, OutEdgeIt, ReachedMap>& |
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575 | operator++() { |
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576 | if (actual_edge.valid()) { |
---|
577 | ++actual_edge; |
---|
578 | if (actual_edge.valid()) { |
---|
579 | NodeIt w=G.bNode(actual_edge); |
---|
580 | if (!reached.get(w)) { |
---|
581 | bfs_queue.push(w); |
---|
582 | reached.set(w, true); |
---|
583 | b_node_newly_reached=true; |
---|
584 | } else { |
---|
585 | b_node_newly_reached=false; |
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586 | } |
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587 | } |
---|
588 | } else { |
---|
589 | bfs_queue.pop(); |
---|
590 | if (!bfs_queue.empty()) { |
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591 | G.getFirst(actual_edge, bfs_queue.front()); |
---|
592 | if (actual_edge.valid()) { |
---|
593 | NodeIt w=G.bNode(actual_edge); |
---|
594 | if (!reached.get(w)) { |
---|
595 | bfs_queue.push(w); |
---|
596 | reached.set(w, true); |
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597 | b_node_newly_reached=true; |
---|
598 | } else { |
---|
599 | b_node_newly_reached=false; |
---|
600 | } |
---|
601 | } |
---|
602 | } |
---|
603 | } |
---|
604 | return *this; |
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605 | } |
---|
606 | bool finished() const { return bfs_queue.empty(); } |
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607 | operator OutEdgeIt () const { return actual_edge; } |
---|
608 | bool isBNodeNewlyReached() const { return b_node_newly_reached; } |
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609 | bool isANodeExamined() const { return !(actual_edge.valid()); } |
---|
610 | NodeIt aNode() const { return bfs_queue.front(); } |
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611 | NodeIt bNode() const { return G.bNode(actual_edge); } |
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612 | const ReachedMap& getReachedMap() const { return reached; } |
---|
613 | const std::queue<NodeIt>& getBfsQueue() const { return bfs_queue; } |
---|
614 | }; |
---|
615 | |
---|
616 | |
---|
617 | template <typename Graph, typename OutEdgeIt, typename ReachedMap> |
---|
618 | struct DfsIterator4 { |
---|
619 | typedef typename Graph::NodeIt NodeIt; |
---|
620 | const Graph& G; |
---|
621 | std::stack<OutEdgeIt> dfs_stack; |
---|
622 | //ReachedMap& reached; |
---|
623 | bool b_node_newly_reached; |
---|
624 | OutEdgeIt actual_edge; |
---|
625 | NodeIt actual_node; |
---|
626 | ReachedMap reached; |
---|
627 | DfsIterator4(const Graph& _G |
---|
628 | /*, std::stack<OutEdgeIt>& _bfs_queue, |
---|
629 | ReachedMap& _reached*/) : |
---|
630 | G(_G), reached(G, false) /*, bfs_queue(_bfs_queue), reached(_reached)*/ { |
---|
631 | //actual_edge=bfs_queue.top(); |
---|
632 | //if (actual_edge.valid()) { |
---|
633 | // NodeIt w=G.bNode(actual_edge); |
---|
634 | //if (!reached.get(w)) { |
---|
635 | // bfs_queue.push(OutEdgeIt(G, w)); |
---|
636 | // reached.set(w, true); |
---|
637 | // b_node_newly_reached=true; |
---|
638 | //} else { |
---|
639 | // ++(bfs_queue.top()); |
---|
640 | // b_node_newly_reached=false; |
---|
641 | //} |
---|
642 | //} else { |
---|
643 | // bfs_queue.pop(); |
---|
644 | //} |
---|
645 | } |
---|
646 | void pushAndSetReached(NodeIt s) { |
---|
647 | reached.set(s, true); |
---|
648 | dfs_stack.push(G.template first<OutEdgeIt>(s)); |
---|
649 | } |
---|
650 | DfsIterator4<Graph, OutEdgeIt, ReachedMap>& |
---|
651 | operator++() { |
---|
652 | actual_edge=dfs_stack.top(); |
---|
653 | //actual_node=G.aNode(actual_edge); |
---|
654 | if (actual_edge.valid()) { |
---|
655 | NodeIt w=G.bNode(actual_edge); |
---|
656 | actual_node=w; |
---|
657 | if (!reached.get(w)) { |
---|
658 | dfs_stack.push(G.template first<OutEdgeIt>(w)); |
---|
659 | reached.set(w, true); |
---|
660 | b_node_newly_reached=true; |
---|
661 | } else { |
---|
662 | ++(dfs_stack.top()); |
---|
663 | b_node_newly_reached=false; |
---|
664 | } |
---|
665 | } else { |
---|
666 | //actual_node=G.aNode(dfs_stack.top()); |
---|
667 | dfs_stack.pop(); |
---|
668 | } |
---|
669 | return *this; |
---|
670 | } |
---|
671 | bool finished() const { return dfs_stack.empty(); } |
---|
672 | operator OutEdgeIt () const { return actual_edge; } |
---|
673 | bool isBNodeNewlyReached() const { return b_node_newly_reached; } |
---|
674 | bool isANodeExamined() const { return !(actual_edge.valid()); } |
---|
675 | NodeIt aNode() const { return actual_node; } |
---|
676 | NodeIt bNode() const { return G.bNode(actual_edge); } |
---|
677 | const ReachedMap& getReachedMap() const { return reached; } |
---|
678 | const std::stack<OutEdgeIt>& getDfsStack() const { return dfs_stack; } |
---|
679 | }; |
---|
680 | |
---|
681 | |
---|
682 | |
---|
683 | template <typename GraphWrapper, typename ReachedMap> |
---|
684 | class BfsIterator5 { |
---|
685 | typedef typename GraphWrapper::NodeIt NodeIt; |
---|
686 | typedef typename GraphWrapper::OutEdgeIt OutEdgeIt; |
---|
687 | GraphWrapper gw; |
---|
688 | std::queue<NodeIt> bfs_queue; |
---|
689 | ReachedMap reached; |
---|
690 | bool b_node_newly_reached; |
---|
691 | OutEdgeIt actual_edge; |
---|
692 | public: |
---|
693 | BfsIterator5(GraphWrapper _gw) : |
---|
694 | gw(_gw), reached(_gw.getGraph()) { } |
---|
695 | void pushAndSetReached(NodeIt s) { |
---|
696 | reached.set(s, true); |
---|
697 | if (bfs_queue.empty()) { |
---|
698 | bfs_queue.push(s); |
---|
699 | gw.getFirst(actual_edge, s); |
---|
700 | if (actual_edge.valid()) { |
---|
701 | NodeIt w=gw.bNode(actual_edge); |
---|
702 | if (!reached.get(w)) { |
---|
703 | bfs_queue.push(w); |
---|
704 | reached.set(w, true); |
---|
705 | b_node_newly_reached=true; |
---|
706 | } else { |
---|
707 | b_node_newly_reached=false; |
---|
708 | } |
---|
709 | } |
---|
710 | } else { |
---|
711 | bfs_queue.push(s); |
---|
712 | } |
---|
713 | } |
---|
714 | BfsIterator5<GraphWrapper, ReachedMap>& |
---|
715 | operator++() { |
---|
716 | if (actual_edge.valid()) { |
---|
717 | ++actual_edge; |
---|
718 | if (actual_edge.valid()) { |
---|
719 | NodeIt w=gw.bNode(actual_edge); |
---|
720 | if (!reached.get(w)) { |
---|
721 | bfs_queue.push(w); |
---|
722 | reached.set(w, true); |
---|
723 | b_node_newly_reached=true; |
---|
724 | } else { |
---|
725 | b_node_newly_reached=false; |
---|
726 | } |
---|
727 | } |
---|
728 | } else { |
---|
729 | bfs_queue.pop(); |
---|
730 | if (!bfs_queue.empty()) { |
---|
731 | gw.getFirst(actual_edge, bfs_queue.front()); |
---|
732 | if (actual_edge.valid()) { |
---|
733 | NodeIt w=gw.bNode(actual_edge); |
---|
734 | if (!reached.get(w)) { |
---|
735 | bfs_queue.push(w); |
---|
736 | reached.set(w, true); |
---|
737 | b_node_newly_reached=true; |
---|
738 | } else { |
---|
739 | b_node_newly_reached=false; |
---|
740 | } |
---|
741 | } |
---|
742 | } |
---|
743 | } |
---|
744 | return *this; |
---|
745 | } |
---|
746 | bool finished() const { return bfs_queue.empty(); } |
---|
747 | operator OutEdgeIt () const { return actual_edge; } |
---|
748 | bool isBNodeNewlyReached() const { return b_node_newly_reached; } |
---|
749 | bool isANodeExamined() const { return !(actual_edge.valid()); } |
---|
750 | NodeIt aNode() const { return bfs_queue.front(); } |
---|
751 | NodeIt bNode() const { return gw.bNode(actual_edge); } |
---|
752 | const ReachedMap& getReachedMap() const { return reached; } |
---|
753 | const std::queue<NodeIt>& getBfsQueue() const { return bfs_queue; } |
---|
754 | }; |
---|
755 | |
---|
756 | |
---|
757 | |
---|
758 | } // namespace marci |
---|
759 | |
---|
760 | #endif //BFS_ITERATOR_HH |
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