1 | /* |
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2 | * ORXONOX - the hottest 3D action shooter ever to exist |
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3 | * > www.orxonox.net < |
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4 | * |
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5 | * |
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6 | * License notice: |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU General Public License |
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10 | * as published by the Free Software Foundation; either version 2 |
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11 | * of the License, or (at your option) any later version. |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | * GNU General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with this program; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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21 | * |
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22 | * Author: |
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23 | * Fabian 'x3n' Landau |
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24 | * Co-authors: |
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25 | * ... |
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26 | * |
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27 | */ |
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28 | |
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29 | // Inspired by boost::intrusive_ptr by Peter Dimov |
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30 | |
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31 | #ifndef _WeakPtr_H__ |
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32 | #define _WeakPtr_H__ |
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33 | |
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34 | #include "CorePrereqs.h" |
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35 | |
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36 | #include <cassert> |
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37 | #include "OrxonoxClass.h" |
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38 | |
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39 | namespace orxonox |
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40 | { |
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41 | template <class T> |
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42 | class WeakPtr |
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43 | { |
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44 | public: |
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45 | inline WeakPtr() : pointer_(0), base_(0) |
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46 | { |
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47 | } |
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48 | |
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49 | inline WeakPtr(int) : pointer_(0), base_(0) |
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50 | { |
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51 | } |
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52 | |
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53 | inline WeakPtr(T* pointer) : pointer_(pointer), base_(pointer) |
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54 | { |
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55 | if (this->base_) |
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56 | this->base_->registerWeakPtr(this); |
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57 | } |
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58 | |
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59 | inline WeakPtr(const WeakPtr& other) : pointer_(other.pointer_), base_(other.base_) |
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60 | { |
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61 | if (this->base_) |
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62 | this->base_->registerWeakPtr(this); |
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63 | } |
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64 | |
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65 | template <class O> |
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66 | inline WeakPtr(const WeakPtr<O>& other) : pointer_(other.get()), base_(other.base_) |
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67 | { |
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68 | if (this->base_) |
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69 | this->base_->registerWeakPtr(this); |
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70 | } |
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71 | |
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72 | inline ~WeakPtr() |
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73 | { |
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74 | if (this->base_) |
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75 | this->base_->unregisterWeakPtr(this); |
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76 | } |
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77 | |
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78 | inline const WeakPtr& operator=(int) |
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79 | { |
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80 | WeakPtr(0).swap(*this); |
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81 | return *this; |
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82 | } |
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83 | |
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84 | inline const WeakPtr& operator=(T* pointer) |
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85 | { |
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86 | WeakPtr(pointer).swap(*this); |
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87 | return *this; |
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88 | } |
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89 | |
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90 | inline const WeakPtr& operator=(const WeakPtr& other) |
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91 | { |
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92 | WeakPtr(other).swap(*this); |
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93 | return *this; |
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94 | } |
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95 | |
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96 | template <class O> |
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97 | inline const WeakPtr& operator=(const WeakPtr<O>& other) |
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98 | { |
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99 | WeakPtr(other).swap(*this); |
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100 | return *this; |
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101 | } |
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102 | |
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103 | inline T* get() const |
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104 | { |
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105 | return this->pointer_; |
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106 | } |
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107 | |
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108 | inline OrxonoxClass* getBase() const |
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109 | { |
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110 | return this->base_; |
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111 | } |
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112 | |
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113 | inline operator T*() const |
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114 | { |
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115 | return this->pointer_; |
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116 | } |
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117 | |
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118 | inline T* operator->() const |
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119 | { |
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120 | assert(this->pointer_ != 0); |
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121 | return this->pointer_; |
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122 | } |
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123 | |
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124 | inline T& operator*() const |
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125 | { |
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126 | assert(this->pointer_ != 0); |
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127 | return *this->pointer_; |
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128 | } |
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129 | |
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130 | inline bool operator!() const |
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131 | { |
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132 | return (this->pointer_ == 0); |
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133 | } |
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134 | |
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135 | inline void swap(WeakPtr& other) |
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136 | { |
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137 | { |
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138 | T* temp = this->pointer_; |
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139 | this->pointer_ = other.pointer_; |
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140 | other.pointer_ = temp; |
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141 | } |
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142 | { |
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143 | OrxonoxClass* temp = this->base_; |
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144 | this->base_ = other.base_; |
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145 | other.base_ = temp; |
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146 | } |
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147 | } |
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148 | |
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149 | inline void reset() |
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150 | { |
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151 | WeakPtr().swap(*this); |
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152 | } |
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153 | |
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154 | private: |
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155 | T* pointer_; |
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156 | OrxonoxClass* base_; |
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157 | }; |
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158 | |
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159 | template <class T> |
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160 | void swap(WeakPtr<T>& a, WeakPtr<T>& b) |
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161 | { |
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162 | a.swap(b); |
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163 | } |
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164 | |
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165 | template <class T, class U> |
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166 | WeakPtr<T> static_pointer_cast(const WeakPtr<U>& p) |
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167 | { |
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168 | return static_cast<T*>(p.get()); |
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169 | } |
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170 | |
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171 | template <class T, class U> |
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172 | WeakPtr<T> const_pointer_cast(const WeakPtr<U>& p) |
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173 | { |
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174 | return const_cast<T*>(p.get()); |
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175 | } |
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176 | |
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177 | template <class T, class U> |
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178 | WeakPtr<T> dynamic_pointer_cast(const WeakPtr<U>& p) |
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179 | { |
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180 | return dynamic_cast<T*>(p.get()); |
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181 | } |
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182 | } |
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183 | |
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184 | #endif /* _WeakPtr_H__ */ |
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