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1 /* |
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2 * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved. |
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3 * |
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4 * Redistribution and use in source and binary forms, with or without |
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5 * modification, are permitted provided that the following conditions |
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6 * are met: |
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7 * |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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14 * its contributors may be used to endorse or promote products derived |
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15 * from this software without specific prior written permission. |
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16 * |
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17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 */ |
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28 |
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29 #ifndef JSRetainPtr_h |
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30 #define JSRetainPtr_h |
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31 |
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32 #include <JavaScriptCore/JSStringRef.h> |
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33 #include <algorithm> |
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34 |
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35 inline void JSRetain(JSStringRef string) { JSStringRetain(string); } |
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36 inline void JSRelease(JSStringRef string) { JSStringRelease(string); } |
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37 |
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38 enum AdoptTag { Adopt }; |
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39 |
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40 template <typename T> class JSRetainPtr { |
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41 public: |
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42 JSRetainPtr() : m_ptr(0) {} |
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43 JSRetainPtr(T ptr) : m_ptr(ptr) { if (ptr) JSRetain(ptr); } |
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44 |
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45 JSRetainPtr(AdoptTag, T ptr) : m_ptr(ptr) { } |
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46 |
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47 JSRetainPtr(const JSRetainPtr& o) : m_ptr(o.m_ptr) { if (T ptr = m_ptr) JSRetain(ptr); } |
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48 |
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49 ~JSRetainPtr() { if (T ptr = m_ptr) JSRelease(ptr); } |
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50 |
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51 template <typename U> JSRetainPtr(const JSRetainPtr<U>& o) : m_ptr(o.get()) { if (T ptr = m_ptr) JSRetain(ptr); } |
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52 |
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53 T get() const { return m_ptr; } |
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54 |
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55 T releaseRef() { T tmp = m_ptr; m_ptr = 0; return tmp; } |
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56 |
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57 T operator->() const { return m_ptr; } |
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58 |
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59 bool operator!() const { return !m_ptr; } |
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60 |
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61 // This conversion operator allows implicit conversion to bool but not to other integer types. |
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62 typedef T JSRetainPtr::*UnspecifiedBoolType; |
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63 operator UnspecifiedBoolType() const { return m_ptr ? &JSRetainPtr::m_ptr : 0; } |
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64 |
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65 JSRetainPtr& operator=(const JSRetainPtr&); |
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66 template <typename U> JSRetainPtr& operator=(const JSRetainPtr<U>&); |
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67 JSRetainPtr& operator=(T); |
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68 template <typename U> JSRetainPtr& operator=(U*); |
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69 |
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70 void adopt(T); |
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71 |
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72 void swap(JSRetainPtr&); |
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73 |
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74 private: |
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75 T m_ptr; |
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76 }; |
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77 |
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78 template <typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(const JSRetainPtr<T>& o) |
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79 { |
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80 T optr = o.get(); |
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81 if (optr) |
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82 JSRetain(optr); |
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83 T ptr = m_ptr; |
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84 m_ptr = optr; |
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85 if (ptr) |
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86 JSRelease(ptr); |
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87 return *this; |
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88 } |
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89 |
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90 template <typename T> template <typename U> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(const JSRetainPtr<U>& o) |
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91 { |
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92 T optr = o.get(); |
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93 if (optr) |
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94 JSRetain(optr); |
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95 T ptr = m_ptr; |
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96 m_ptr = optr; |
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97 if (ptr) |
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98 JSRelease(ptr); |
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99 return *this; |
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100 } |
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101 |
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102 template <typename T> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(T optr) |
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103 { |
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104 if (optr) |
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105 JSRetain(optr); |
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106 T ptr = m_ptr; |
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107 m_ptr = optr; |
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108 if (ptr) |
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109 JSRelease(ptr); |
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110 return *this; |
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111 } |
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112 |
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113 template <typename T> inline void JSRetainPtr<T>::adopt(T optr) |
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114 { |
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115 T ptr = m_ptr; |
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116 m_ptr = optr; |
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117 if (ptr) |
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118 JSRelease(ptr); |
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119 } |
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120 |
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121 template <typename T> template <typename U> inline JSRetainPtr<T>& JSRetainPtr<T>::operator=(U* optr) |
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122 { |
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123 if (optr) |
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124 JSRetain(optr); |
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125 T ptr = m_ptr; |
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126 m_ptr = optr; |
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127 if (ptr) |
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128 JSRelease(ptr); |
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129 return *this; |
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130 } |
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131 |
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132 template <class T> inline void JSRetainPtr<T>::swap(JSRetainPtr<T>& o) |
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133 { |
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134 std::swap(m_ptr, o.m_ptr); |
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135 } |
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136 |
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137 template <class T> inline void swap(JSRetainPtr<T>& a, JSRetainPtr<T>& b) |
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138 { |
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139 a.swap(b); |
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140 } |
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141 |
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142 template <typename T, typename U> inline bool operator==(const JSRetainPtr<T>& a, const JSRetainPtr<U>& b) |
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143 { |
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144 return a.get() == b.get(); |
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145 } |
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146 |
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147 template <typename T, typename U> inline bool operator==(const JSRetainPtr<T>& a, U* b) |
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148 { |
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149 return a.get() == b; |
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150 } |
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151 |
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152 template <typename T, typename U> inline bool operator==(T* a, const JSRetainPtr<U>& b) |
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153 { |
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154 return a == b.get(); |
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155 } |
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156 |
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157 template <typename T, typename U> inline bool operator!=(const JSRetainPtr<T>& a, const JSRetainPtr<U>& b) |
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158 { |
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159 return a.get() != b.get(); |
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160 } |
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161 |
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162 template <typename T, typename U> inline bool operator!=(const JSRetainPtr<T>& a, U* b) |
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163 { |
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164 return a.get() != b; |
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165 } |
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166 |
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167 template <typename T, typename U> inline bool operator!=(T* a, const JSRetainPtr<U>& b) |
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168 { |
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169 return a != b.get(); |
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170 } |
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171 |
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172 |
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173 #endif // JSRetainPtr_h |