Mercurial > fife-parpg
annotate engine/core/util/structures/priorityqueue.h @ 504:0196c83c7270
One quick update to the map file. The last cannonspread5 powerup wasn't correctly identified.
author | prock@33b003aa-7bff-0310-803a-e67f0ece8222 |
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date | Tue, 18 May 2010 16:01:35 +0000 |
parents | 90005975cdbb |
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rev | line source |
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1 /*************************************************************************** |
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2 * Copyright (C) 2005-2008 by the FIFE team * |
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3 * http://www.fifengine.de * |
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4 * This file is part of FIFE. * |
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5 * * |
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6 * FIFE is free software; you can redistribute it and/or * |
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7 * modify it under the terms of the GNU Lesser General Public * |
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8 * License as published by the Free Software Foundation; either * |
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9 * version 2.1 of the License, or (at your option) any later version. * |
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10 * * |
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11 * This library is distributed in the hope that it will be useful, * |
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * |
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14 * Lesser General Public License for more details. * |
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15 * * |
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16 * You should have received a copy of the GNU Lesser General Public * |
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17 * License along with this library; if not, write to the * |
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18 * Free Software Foundation, Inc., * |
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * |
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20 ***************************************************************************/ |
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21 |
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22 #ifndef FIFE_SOLVER_INDEXEDPQ_H |
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23 #define FIFE_SOLVER_INDEXEDPQ_H |
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24 |
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25 #include <cassert> |
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26 #include <list> |
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27 |
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28 namespace FIFE { |
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29 |
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30 /** A pq which stores index-value pairs for elements. |
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31 * |
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32 * This acts as a normal PQ but stores some extra information about the |
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33 * elements that it's storing, namely a special unique index. |
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34 */ |
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35 template<typename index_type, typename priority_type> |
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36 class PriorityQueue { |
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37 public: |
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38 /** Used for element ordering. |
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39 * |
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40 */ |
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41 enum Ordering { |
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42 Ascending, //!< lowest priority first. |
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43 Descending //!< highest priority first. |
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44 }; |
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45 |
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46 typedef std::pair<index_type, priority_type> value_type; |
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47 |
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48 /** Constructor |
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49 * |
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50 */ |
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51 PriorityQueue(void) : m_ordering(Ascending) { |
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52 } |
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53 |
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54 /** Constructor |
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55 * |
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56 * @param ordering The ordering the priority queue should use. |
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57 */ |
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58 PriorityQueue(const Ordering ordering) : m_ordering(ordering) { |
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59 } |
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60 |
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61 /** Pushes a new element onto the queue. |
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62 * |
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63 * The element is pushed onto the queue and then moved up the queue until it's |
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64 * in the correct position by priority. |
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65 * |
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66 * @param element Of type value_type which contains both the index and the priority of the element. |
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67 */ |
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68 void pushElement(const value_type& element); |
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69 |
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70 /** Pops the element with the highest priority from the queue. |
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71 * |
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72 * Removes and deletes the highest priority element. |
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73 */ |
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74 void popElement(void); |
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75 |
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76 /** Changes the priority of an element. |
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77 * |
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78 * Locates the element with the given index and changes it's priority to the given |
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79 * priority, it then re-orders the priority queue to take account of this new information. |
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80 * |
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81 * @param index The index of the element to change the priority of. |
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82 * @param newPriority The new priority of the element. |
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83 * @return True if the element could be found, false otherwise. |
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84 */ |
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85 bool changeElementPriority(const index_type& index, const priority_type& newPriority); |
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86 |
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87 /** Removes all elements from the priority queue. |
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88 * |
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89 */ |
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90 void clear(void); |
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91 |
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92 /** Retrieves the element with the highest priority. |
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93 * |
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94 * This function will generate an assertion error if the pq is |
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95 * empty. |
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96 * |
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97 * @return A const reference to the highest priority element. |
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98 */ |
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99 const value_type getPriorityElement(void) const { |
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100 |
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101 assert(!empty()); |
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102 |
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103 return m_elements.front(); |
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104 |
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105 } |
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106 |
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107 /** Determines whether the queue is currently empty. |
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108 * |
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109 * @return true if it is empty, false otherwise. |
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110 */ |
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111 bool empty(void) const { |
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112 return m_elements.empty(); |
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113 } |
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114 |
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115 /** Returns the current size of the queue. |
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116 * |
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117 */ |
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118 size_t size(void) const { |
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119 return m_elements.size(); |
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120 } |
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121 private: |
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122 typedef std::list<value_type> ElementList; |
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123 typedef typename ElementList::iterator ElementListIt; |
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124 typedef typename ElementList::const_iterator ElementListConstIt; |
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125 |
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126 //A list of valuetype pairs that represents the pq. |
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127 ElementList m_elements; |
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128 |
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129 //The order to use when sorting the pq. |
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130 Ordering m_ordering; |
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131 |
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132 /** Orders a PQ element up the list. |
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133 * |
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134 * @param i An iterator representing the element in the list to be sorted up. |
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135 */ |
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136 void orderUp(ElementListIt i); |
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137 /** Orders a PQ element up the list. |
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138 * |
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139 * @param entry A const reference to a value_type which represents the element to be added to the |
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140 * pq. |
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141 */ |
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142 void orderUp(const value_type& entry); |
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143 |
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144 /** Orders a PQ element down the list. |
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145 * |
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146 * @param An iterator representing the element in the PQ to order down. |
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147 */ |
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148 void orderDown(ElementListIt i); |
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149 |
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150 /** Retrieves the iterator to the element with the given index. |
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151 * |
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152 * @param index A const reference to the index to find. |
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153 */ |
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154 ElementListIt getElementIterator(const index_type& index) { |
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155 |
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156 for(ElementListIt i = m_elements.begin(); i != m_elements.end(); ++i) { |
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157 if(i->first == index) { |
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158 return i; |
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159 } |
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160 } |
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161 |
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162 return m_elements.end(); |
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163 |
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164 } |
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165 |
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166 /** The comparison function, used to compare two elements. |
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167 * |
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168 * @param a The l-operand of the comparison operation. |
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169 * @param b The r-operand of the comparison operation. |
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170 * @return An integer representing the result of the comparison operation. 1 being a is greather than b, |
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171 * -1 being a is less than b and 0 meaning that they're equal. |
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172 */ |
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173 int compare(const value_type& a, const value_type& b); |
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174 }; |
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175 } |
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176 |
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177 template<typename index_type, typename priority_type> |
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178 void FIFE::PriorityQueue<index_type, priority_type>::pushElement(const value_type& element) { |
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179 if(empty()) { |
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180 m_elements.push_front(element); |
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181 } |
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182 else { |
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183 orderUp(element); |
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184 } |
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185 } |
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186 |
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187 template<typename index_type, typename priority_type> |
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188 void FIFE::PriorityQueue<index_type, priority_type>::popElement(void) { |
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189 |
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190 if(!empty()) { |
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191 m_elements.pop_front(); |
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192 } |
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193 |
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194 } |
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195 |
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196 template<typename index_type, typename priority_type> |
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197 bool FIFE::PriorityQueue<index_type, priority_type>::changeElementPriority(const index_type& index, const priority_type& newPriority) { |
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198 |
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199 ElementListIt i = getElementIterator(index); |
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200 |
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|
201 if(i == m_elements.end()) { |
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* Datasets becomes the new trunk and retires after that :-)
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202 return false; |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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203 } |
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204 |
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205 int compare_res = compare(value_type(index, newPriority), (*i)); |
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* Datasets becomes the new trunk and retires after that :-)
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206 |
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207 i->second = newPriority; |
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* Datasets becomes the new trunk and retires after that :-)
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208 |
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* Datasets becomes the new trunk and retires after that :-)
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209 if(compare_res > 0 && i != m_elements.begin()) { |
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* Datasets becomes the new trunk and retires after that :-)
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210 orderDown(i); |
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* Datasets becomes the new trunk and retires after that :-)
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211 } else if(compare_res < 0) { |
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* Datasets becomes the new trunk and retires after that :-)
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212 orderUp(i); |
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* Datasets becomes the new trunk and retires after that :-)
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213 } |
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214 |
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215 return true; |
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216 |
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217 } |
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218 |
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219 template<typename index_type, typename priority_type> |
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* Datasets becomes the new trunk and retires after that :-)
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220 void FIFE::PriorityQueue<index_type, priority_type>::clear(void) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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221 |
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222 m_elements.clear(); |
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* Datasets becomes the new trunk and retires after that :-)
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223 |
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224 } |
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225 |
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226 template<typename index_type, typename priority_type> |
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* Datasets becomes the new trunk and retires after that :-)
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227 void FIFE::PriorityQueue<index_type, priority_type>::orderUp(ElementListIt i) { |
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228 |
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229 assert(i != m_elements.end() && L"Invalid iterator passed to function"); |
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* Datasets becomes the new trunk and retires after that :-)
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230 |
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* Datasets becomes the new trunk and retires after that :-)
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231 value_type vt = (*i); |
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* Datasets becomes the new trunk and retires after that :-)
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232 |
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* Datasets becomes the new trunk and retires after that :-)
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233 i = m_elements.erase(i); |
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* Datasets becomes the new trunk and retires after that :-)
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234 |
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* Datasets becomes the new trunk and retires after that :-)
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235 while(i != m_elements.end()) { |
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* Datasets becomes the new trunk and retires after that :-)
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236 |
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* Datasets becomes the new trunk and retires after that :-)
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237 if(compare(vt, (*i)) > 0) { |
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* Datasets becomes the new trunk and retires after that :-)
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238 |
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* Datasets becomes the new trunk and retires after that :-)
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239 m_elements.insert(i, vt); |
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* Datasets becomes the new trunk and retires after that :-)
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240 |
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* Datasets becomes the new trunk and retires after that :-)
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241 return; |
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* Datasets becomes the new trunk and retires after that :-)
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242 } |
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* Datasets becomes the new trunk and retires after that :-)
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243 |
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* Datasets becomes the new trunk and retires after that :-)
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244 ++i; |
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* Datasets becomes the new trunk and retires after that :-)
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245 } |
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* Datasets becomes the new trunk and retires after that :-)
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246 |
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* Datasets becomes the new trunk and retires after that :-)
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247 m_elements.push_back(vt); |
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* Datasets becomes the new trunk and retires after that :-)
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248 |
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* Datasets becomes the new trunk and retires after that :-)
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249 } |
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* Datasets becomes the new trunk and retires after that :-)
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250 |
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* Datasets becomes the new trunk and retires after that :-)
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251 template<class index_type, class priority_type> |
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* Datasets becomes the new trunk and retires after that :-)
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252 void FIFE::PriorityQueue<index_type, priority_type>::orderUp(const value_type& val) |
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* Datasets becomes the new trunk and retires after that :-)
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253 { |
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* Datasets becomes the new trunk and retires after that :-)
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254 for(ElementListIt i = m_elements.begin(); i != m_elements.end(); ++i) |
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* Datasets becomes the new trunk and retires after that :-)
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255 { |
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* Datasets becomes the new trunk and retires after that :-)
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|
256 assert(val.first != i->first); |
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* Datasets becomes the new trunk and retires after that :-)
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257 |
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* Datasets becomes the new trunk and retires after that :-)
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|
258 if(compare(val, (*i)) > 0) |
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* Datasets becomes the new trunk and retires after that :-)
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|
259 { |
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* Datasets becomes the new trunk and retires after that :-)
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|
260 assert(val.first != i->first); |
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* Datasets becomes the new trunk and retires after that :-)
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|
261 |
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* Datasets becomes the new trunk and retires after that :-)
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|
262 m_elements.insert(i, val); |
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* Datasets becomes the new trunk and retires after that :-)
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|
263 |
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* Datasets becomes the new trunk and retires after that :-)
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|
264 return; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
265 } |
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* Datasets becomes the new trunk and retires after that :-)
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|
266 } |
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* Datasets becomes the new trunk and retires after that :-)
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267 |
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* Datasets becomes the new trunk and retires after that :-)
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|
268 m_elements.push_back(val); |
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* Datasets becomes the new trunk and retires after that :-)
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|
269 } |
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* Datasets becomes the new trunk and retires after that :-)
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|
270 |
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* Datasets becomes the new trunk and retires after that :-)
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changeset
|
271 template<typename index_type, typename priority_type> |
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* Datasets becomes the new trunk and retires after that :-)
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|
272 void FIFE::PriorityQueue<index_type, priority_type>::orderDown(ElementListIt i) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
273 |
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* Datasets becomes the new trunk and retires after that :-)
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|
274 assert(i != m_elements.end()); |
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* Datasets becomes the new trunk and retires after that :-)
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275 |
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* Datasets becomes the new trunk and retires after that :-)
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|
276 value_type vt = (*i); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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277 |
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* Datasets becomes the new trunk and retires after that :-)
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|
278 i = m_elements.erase(i); |
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* Datasets becomes the new trunk and retires after that :-)
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|
279 |
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* Datasets becomes the new trunk and retires after that :-)
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|
280 if(i == m_elements.end()) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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parents:
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|
281 --i; |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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|
282 } |
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* Datasets becomes the new trunk and retires after that :-)
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|
283 |
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* Datasets becomes the new trunk and retires after that :-)
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diff
changeset
|
284 ElementListIt j = i; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
285 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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|
286 ++j; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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|
287 |
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* Datasets becomes the new trunk and retires after that :-)
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changeset
|
288 while(i != m_elements.begin()) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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parents:
diff
changeset
|
289 if(compare(vt, (*i)) < 0) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
290 |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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changeset
|
291 m_elements.insert(j, vt); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
292 |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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changeset
|
293 return; |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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|
294 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
295 |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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|
296 --i; |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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|
297 --j; |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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|
298 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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|
299 |
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* Datasets becomes the new trunk and retires after that :-)
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parents:
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changeset
|
300 m_elements.push_front(vt); |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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changeset
|
301 } |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
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parents:
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changeset
|
302 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff
changeset
|
303 template<typename index_type, typename priority_type> |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff
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304 int FIFE::PriorityQueue<index_type, priority_type>::compare(const value_type& a, const value_type& b) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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305 |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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306 if(m_ordering == Descending) { |
4a0efb7baf70
* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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307 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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308 if(a.second > b.second) { |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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309 return 1; |
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* Datasets becomes the new trunk and retires after that :-)
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310 } else if(b.second > a.second) { |
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* Datasets becomes the new trunk and retires after that :-)
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311 return -1; |
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* Datasets becomes the new trunk and retires after that :-)
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312 } |
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* Datasets becomes the new trunk and retires after that :-)
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313 |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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314 } else { |
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* Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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315 |
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* Datasets becomes the new trunk and retires after that :-)
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316 if(a.second < b.second) { |
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* Datasets becomes the new trunk and retires after that :-)
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317 return 1; |
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* Datasets becomes the new trunk and retires after that :-)
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318 } else if(b.second < a.second) { |
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* Datasets becomes the new trunk and retires after that :-)
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319 return -1; |
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* Datasets becomes the new trunk and retires after that :-)
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320 } |
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* Datasets becomes the new trunk and retires after that :-)
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321 } |
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* Datasets becomes the new trunk and retires after that :-)
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322 |
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* Datasets becomes the new trunk and retires after that :-)
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323 return 0; |
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* Datasets becomes the new trunk and retires after that :-)
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324 } |
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* Datasets becomes the new trunk and retires after that :-)
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325 |
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* Datasets becomes the new trunk and retires after that :-)
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326 #endif |