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<a href="intrusive__ptr_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/* Copyright (C) 2006 to 2013 Chris Vine</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"></span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">The library comprised in this file or of which this file is part is</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">distributed by Chris Vine under the GNU Lesser General Public</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">License as follows:</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"></span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> This library is free software; you can redistribute it and/or</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> modify it under the terms of the GNU Lesser General Public License</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> as published by the Free Software Foundation; either version 2.1 of</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> the License, or (at your option) any later version.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"></span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> This library is distributed in the hope that it will be useful, but</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> Lesser General Public License, version 2.1, for more details.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> You should have received a copy of the GNU Lesser General Public</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> License, version 2.1, along with this library (see the file LGPL.TXT</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> which came with this source code package in the c++-gtk-utils</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> sub-directory); if not, write to the Free Software Foundation, Inc.,</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">However, it is not intended that the object code of a program whose</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">source code instantiates a template from this file or uses macros or</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">inline functions (of any length) should by reason only of that</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">instantiation or use be subject to the restrictions of use in the GNU</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">Lesser General Public License. With that in mind, the words "and</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">macros, inline functions and instantiations of templates (of any</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">length)" shall be treated as substituted for the words "and small</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">macros and small inline functions (ten lines or less in length)" in</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">the fourth paragraph of section 5 of that licence. This does not</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">affect any other reason why object code may be subject to the</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">restrictions in that licence (nor for the avoidance of doubt does it</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">affect the application of section 2 of that licence to modifications</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">of the source code in this file).</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"></span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#ifndef CGU_INTRUSIVE_PTR_H</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor"></span><span class="preprocessor">#define CGU_INTRUSIVE_PTR_H</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// define this if, instead of GLIB atomic funcions/memory barriers,</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// you want to use a (slower) mutex to lock the reference count in the</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// IntrusiveLockCounter class</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">/* #define CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX 1 */</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include <utility></span> <span class="comment">// for std::move and std::swap</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include <functional></span> <span class="comment">// for std::less and std::hash<T*></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#include <cstddef></span> <span class="comment">// for std::size_t</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#ifdef CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor"></span><span class="preprocessor">#include <<a class="code" href="mutex_8h.html" title="Provides wrapper classes for pthread mutexes and condition variables, and scoped locking classes for ...">c++-gtk-utils/mutex.h</a>></span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor"></span><span class="preprocessor">#include <glib.h></span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#include <<a class="code" href="cgu__config_8h.html">c++-gtk-utils/cgu_config.h</a>></span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"></span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * @addtogroup handles handles and smart pointers</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="keyword">namespace </span>Cgu {</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"></span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * @class IntrusivePtr intrusive_ptr.h c++-gtk-utils/intrusive_ptr.h</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> * @brief This is a smart pointer for managing objects allocated on</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> * freestore which maintain their own reference count.</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * @details This is a class which manages objects which maintain their</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * own reference count. It requires that the referenced object has</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * two functions called ref() and unref(), which increment and</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * decrement the reference count respectively. The IntrusiveCounter</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> * or IntrusiveLockCounter class can be inherited from to do this, but</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * they do not have to be used. The IntrusiveLockCounter class is the</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * same as the IntrusiveCounter class, except that it locks the</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * reference count when it is incremented or decremented in order that</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * IntrusivePtr objects in different threads can access the same</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * object. (But only the reference count is locked, not the methods</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * of the referenced object.)</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * All the constructors (including the constructor which takes a raw</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * pointer) increment the reference count, and the destructor</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * decrements it and expects the referenced object to be deleted when</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * the last IntrusivePtr referencing a particular object is destroyed.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * The IntrusiveCounter and IntrusiveLockCounter classes behave in</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * this way. (This is different from the behaviour of GobjHandle</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * smart pointers, which are constrained by the GObject reference</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * counting system which begins with a reference count of 1 rather</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * than 0, and of course different from normal shared pointer</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * implementations for the same reason. The advantage of the approach</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * with IntrusivePtr is that an already-managed object may safely be</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> * passed to the constructor taking a raw pointer without any</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> * additional steps being necessary.)</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> </div>
<div class="line"><a name="l00098"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html"> 98</a></span> <span class="keyword">template</span> <<span class="keyword">class</span> T> <span class="keyword">class </span><a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a> {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  T* obj_p;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">void</span> unreference() {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">if</span> (obj_p) obj_p->unref();</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> </div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordtype">void</span> reference() {</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> (obj_p) obj_p->ref();</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  }</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> * This constructor does not throw unless the managed object's ref()</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> * function throws (which would not happen with any sane</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * implementation, and does not happen with the IntrusiveCounter and</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * IntrusiveLockCounter classes).</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * @param ptr The object which the IntrusivePtr is to manage (if</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * any).</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a550697dc6d7c1b15cf90d3005b928e26"> 119</a></span>  <span class="keyword">explicit</span> <a class="code" href="classCgu_1_1IntrusivePtr.html#a550697dc6d7c1b15cf90d3005b928e26">IntrusivePtr</a>(T* ptr = 0) {</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  obj_p = ptr;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  reference();</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  }</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"></span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> * This copy constructor does not throw unless the managed object's</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> * ref() function throws (which would not happen with any sane</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> * implementation, and does not happen with the IntrusiveCounter and</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * IntrusiveLockCounter classes).</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * @param intr_ptr The intrusive pointer to be copied.</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#aea72ab7c433f95659876787d8f93904d"> 131</a></span>  <a class="code" href="classCgu_1_1IntrusivePtr.html#aea72ab7c433f95659876787d8f93904d">IntrusivePtr</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a>& intr_ptr) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  obj_p = intr_ptr.obj_p;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  reference();</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"></span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * The move constructor does not throw. It has move semantics.</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * @param intr_ptr The instrusive pointer to be moved.</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a37240bb9adc45fa874658bcc4efd0ac4"> 140</a></span>  <a class="code" href="classCgu_1_1IntrusivePtr.html#a37240bb9adc45fa874658bcc4efd0ac4">IntrusivePtr</a>(<a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a>&& intr_ptr) noexcept {</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  obj_p = intr_ptr.obj_p;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  intr_ptr.obj_p = 0;</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
<div class="line"><a name="l00145"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a04a374ecab2499e81653198fd49ff15e"> 145</a></span>  <span class="keyword">template</span> <<span class="keyword">class</span> U> <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a>;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"></span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> * A version of the copy constructor which enables pointer type</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> * conversion (assuming the type passed is implicitly type</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * convertible to the managed type, such as a derived type). This</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> * copy constructor does not throw unless the managed object's ref()</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> * function throws (which would not happen with any sane</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> * implementation, and does not happen with the IntrusiveCounter and</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> * IntrusiveLockCounter classes).</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> * @param intr_ptr The intrusive pointer to be copied.</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a135d41419f6bd1d7ab6b4a1b5d06fd91"> 157</a></span>  <span class="keyword">template</span> <<span class="keyword">class</span> U> <a class="code" href="classCgu_1_1IntrusivePtr.html#a135d41419f6bd1d7ab6b4a1b5d06fd91">IntrusivePtr</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<U></a>& intr_ptr) {</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  obj_p = intr_ptr.obj_p;</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  reference();</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  }</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"></span></div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> * A version of the move constructor which enables pointer type</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"> * conversion (assuming the type passed is implicitly type</span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> * convertible to the managed type, such as a derived type). This</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> * move constructor does not throw.</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> * @param intr_ptr The intrusive pointer to be moved.</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00169"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a8c3812e2bb2caff9402d1be440c4ad18"> 169</a></span>  <span class="keyword">template</span> <<span class="keyword">class</span> U> <a class="code" href="classCgu_1_1IntrusivePtr.html#a8c3812e2bb2caff9402d1be440c4ad18">IntrusivePtr</a>(<a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<U></a>&& intr_ptr) noexcept {</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  obj_p = intr_ptr.obj_p;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  intr_ptr.obj_p = 0;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  }</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"> * This method (and so copy or move assignment) does not throw unless</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> * the unref() function or destructor of a managed object throws.</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> * @param intr_ptr The assignee.</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> * @return The IntrusivePtr object after assignment.</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">// having a value type as the argument, rather than reference to const</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="comment">// and then initialising a tmp object, gives the compiler more scope</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="comment">// for optimisation, and also caters for r-values without a separate</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">// overload</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a312a1bd23d0f7a450361dd08587df49a"> 184</a></span>  <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a>& <a class="code" href="classCgu_1_1IntrusivePtr.html#a312a1bd23d0f7a450361dd08587df49a">operator=</a>(<a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a> intr_ptr) {</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <a class="code" href="namespaceCgu.html#af7fd3a7ee74c9924a1449a3acad2f821">std::swap</a>(obj_p, intr_ptr.obj_p);</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  }</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"></span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> * A version of the assignment operator which enables pointer type</span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"> * conversion (assuming the type passed is implicitly type</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"> * convertible to the managed type, such as a derived type). This</span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> * method does not throw unless the unref() function or destructor of</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> * a managed object throws.</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> * @param intr_ptr The assignee.</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> * @return The IntrusivePtr object after assignment.</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a69df46ee02b4ecac9ca90a868c4bab13"> 198</a></span>  <span class="keyword">template</span> <<span class="keyword">class</span> U> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a>& <a class="code" href="classCgu_1_1IntrusivePtr.html#a69df46ee02b4ecac9ca90a868c4bab13">operator=</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<U></a>& intr_ptr) {</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">return</span> <a class="code" href="classCgu_1_1IntrusivePtr.html#a312a1bd23d0f7a450361dd08587df49a">operator=</a>(<a class="code" href="classCgu_1_1IntrusivePtr.html#a04a374ecab2499e81653198fd49ff15e">IntrusivePtr</a>(intr_ptr));</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  }</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"></span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> * A version of the operator for move assignment which enables</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"> * pointer type conversion (assuming the type passed is implicitly</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span> <span class="comment"> * type convertible to the managed type, such as a derived type).</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="comment"> * This method does not throw unless the unref() function or</span></div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span> <span class="comment"> * destructor of a managed object throws.</span></div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span> <span class="comment"> * @param intr_ptr The intrusive pointer to be moved.</span></div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"> * @return The IntrusivePtr object after the move operation.</span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a5e6612f3ddf252714334c405e8433396"> 211</a></span>  <span class="keyword">template</span> <<span class="keyword">class</span> U> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a>& <a class="code" href="classCgu_1_1IntrusivePtr.html#a5e6612f3ddf252714334c405e8433396">operator=</a>(<a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<U></a>&& intr_ptr) {</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">return</span> <a class="code" href="classCgu_1_1IntrusivePtr.html#a312a1bd23d0f7a450361dd08587df49a">operator=</a>(<a class="code" href="classCgu_1_1IntrusivePtr.html#a04a374ecab2499e81653198fd49ff15e">IntrusivePtr</a>(std::move(intr_ptr)));</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  }</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"></span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"> * This method does not throw.</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> * @return A pointer to the managed object (or NULL if none is</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * handled).</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a19bcb754f7367bedfa92ce880449282f"> 220</a></span>  T* <span class="keyword">get</span>() <span class="keyword">const</span> noexcept {<span class="keywordflow">return</span> obj_p;}</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"></span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> * This method does not throw.</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> * @return A reference to the managed object.</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#ac7fbf30d4d2dfdc27879bb4df1e8c494"> 226</a></span>  T& <a class="code" href="classCgu_1_1IntrusivePtr.html#ac7fbf30d4d2dfdc27879bb4df1e8c494">operator*</a>() const noexcept {<span class="keywordflow">return</span> *obj_p;}</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"></span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * This method does not throw.</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> * @return A pointer to the managed object (or NULL if none is</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * handled).</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a0dbd9a5288282879ad137b29f4eff797"> 233</a></span>  T* <a class="code" href="classCgu_1_1IntrusivePtr.html#a0dbd9a5288282879ad137b29f4eff797">operator-></a>() const noexcept {<span class="keywordflow">return</span> obj_p;}</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"></span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"> * Causes the intrusive pointer to cease to manage its managed</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> * object, deleting it if this is the last intrusive pointer managing</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> * it. If the argument passed is not NULL, the intrusive pointer</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * will manage the new object passed. This method does not throw</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * unless the the unref() function or destructor of a managed object</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> * throws.</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * @param ptr NULL (the default), or a new object to manage.</span></div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#acb3483e8ad73f1288f6474044951ed64"> 244</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCgu_1_1IntrusivePtr.html#acb3483e8ad73f1288f6474044951ed64">reset</a>(T* ptr = 0) {</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr</a> tmp(ptr);</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <a class="code" href="namespaceCgu.html#af7fd3a7ee74c9924a1449a3acad2f821">std::swap</a>(obj_p, tmp.obj_p);</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  }</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> <span class="comment"></span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="comment"> * The destructor does not throw unless the destructor of a managed</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment"> * object throws - that should never happen.</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusivePtr.html#a9935566b027ec669cdc930583cbf579d"> 253</a></span>  <a class="code" href="classCgu_1_1IntrusivePtr.html#a9935566b027ec669cdc930583cbf579d">~IntrusivePtr</a>() {unreference();}</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> };</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="comment"></span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment"> * @class IntrusiveCounter intrusive_ptr.h c++-gtk-utils/intrusive_ptr.h</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"> * @brief This is a counter class providing the ref() and unref()</span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="comment"> * functions required by IntrusivePtr.</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> * @sa IntrusiveLockCounter.</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="comment"> * This is a counter class providing the ref() and unref() functions</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="comment"> * required by IntrusivePtr. It is intended to be inherited from by</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"> * classes which are to be managed by such a smart pointer.</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div>
<div class="line"><a name="l00268"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveCounter.html"> 268</a></span> <span class="keyword">class </span><a class="code" href="classCgu_1_1IntrusiveCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr. ">IntrusiveCounter</a> {</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count;</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> </div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="comment">// we should not be able to copy objects of this class</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="comment">// - objects, if constructed on the heap, should be passed</span></div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="comment">// via an IntrusivePtr object. An object of a derived class</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">// might still copy itself via its copy constructor and take</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="comment">// along a new base IntrusiveCounter object constructed via</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="comment">// the default constructor, and thus have a correct reference</span></div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="comment">// count of 0, but derived classes should not try to provide</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="comment">// their own assignment operators.</span><span class="comment"></span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> <span class="comment"> * This class cannot be copied. The copy constructor is deleted.</span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <a class="code" href="classCgu_1_1IntrusiveCounter.html#ae0b74e55ae761b7fdc252912bbbf0a02">IntrusiveCounter</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusiveCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr. ">IntrusiveCounter</a>&) = <span class="keyword">delete</span>;<span class="comment"></span></div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> <span class="comment"> * This class cannot be copied. The assignment operator is deleted.</span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <a class="code" href="classCgu_1_1IntrusiveCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr. ">IntrusiveCounter</a>& <a class="code" href="classCgu_1_1IntrusiveCounter.html#a68fd65e3f627f99f2a3d3c9ff97601e1">operator=</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusiveCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr. ">IntrusiveCounter</a>&) = <span class="keyword">delete</span>;</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="comment"></span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="comment"> * Increments the reference count. This method does not throw.</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00292"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveCounter.html#aada5f35bf90ba6c57cb4b458303a5e82"> 292</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCgu_1_1IntrusiveCounter.html#aada5f35bf90ba6c57cb4b458303a5e82">ref</a>() noexcept {++count;}</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="comment"></span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="comment"> * Decrements the reference count, and if the count reaches 0 deletes</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="comment"> * itself (ie the managed object). This method does not throw unless</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="comment"> * the destructor of a derived class throws - that should never</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"> * happen.</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveCounter.html#ab4f23b4da815fa11f3711a867abc5f39"> 300</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCgu_1_1IntrusiveCounter.html#ab4f23b4da815fa11f3711a867abc5f39">unref</a>() {</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  --count;</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="keywordflow">if</span> (count == 0) <span class="keyword">delete</span> <span class="keyword">this</span>;</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  }</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="comment"></span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="comment"> * The constructor does not throw.</span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveCounter.html#ae0b74e55ae761b7fdc252912bbbf0a02"> 308</a></span>  <a class="code" href="classCgu_1_1IntrusiveCounter.html#ae0b74e55ae761b7fdc252912bbbf0a02">IntrusiveCounter</a>() noexcept: count(0) {}</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="comment"></span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> <span class="comment"> * This destructor does not throw, unless the destructor of a derived</span></div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="comment"> * class throws - that should never happen.</span></div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveCounter.html#a54512d7ab4067f2cb72d44b4b13ab9e9"> 314</a></span>  <span class="keyword">virtual</span> <a class="code" href="classCgu_1_1IntrusiveCounter.html#a54512d7ab4067f2cb72d44b4b13ab9e9">~IntrusiveCounter</a>() {}</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> };</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span> <span class="comment"></span></div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment"> * @class IntrusiveLockCounter intrusive_ptr.h c++-gtk-utils/intrusive_ptr.h</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="comment"> * @brief This is a counter class providing the ref() and unref()</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="comment"> * functions required by IntrusivePtr, with a thread safe reference</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> <span class="comment"> * count..</span></div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="comment"> * @sa IntrusiveCounter.</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="comment"> * This is a counter class providing the ref() and unref() functions</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="comment"> * required by IntrusivePtr. It is intended to be inherited from by</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"> * classes which are to be managed by such a smart pointer, and</span></div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="comment"> * includes synchronization so that such an inheriting class object</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="comment"> * can be accessed by different IntrusivePtr objects in different</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment"> * threads (although the word Lock is in the title, by default it uses</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment"> * glib atomic functions to access the reference count rather than a</span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment"> * mutex, so the overhead should be very small). Note that only the</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment"> * reference count is protected, so this is thread safe in the sense</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="comment"> * in which a raw pointer is thread safe.</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="comment"> * As mentioned, by default glib atomic functions are used to provide</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="comment"> * thread-safe manipulation of the reference count. However, the</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment"> * symbol CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX can be defined so that</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="comment"> * the library uses mutexes instead, which might be useful for some</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="comment"> * debugging purposes. Note that if</span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="comment"> * CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX is to be defined, this is best</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="comment"> * done by textually amending the intrusive_ptr.h header file before</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="comment"> * the library is compiled. This will ensure that everything in the</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment"> * program and the library which includes the intrusive_ptr.h header</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment"> * is guaranteed to see the same definitions so that the C++</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment"> * standard's one-definition-rule is complied with.</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> </div>
<div class="line"><a name="l00349"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveLockCounter.html"> 349</a></span> <span class="keyword">class </span><a class="code" href="classCgu_1_1IntrusiveLockCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr, with a thread safe reference count.. ">IntrusiveLockCounter</a> {</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="preprocessor">#ifdef CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX</span></div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="preprocessor"></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count;</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  <a class="code" href="classCgu_1_1Thread_1_1Mutex.html" title="A wrapper class for pthread mutexes. ">Thread::Mutex</a> mutex;</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="preprocessor"></span> gint count;</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="comment">// we should not be able to copy objects of this class</span></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="comment">// - objects, if constructed on the heap, should be passed</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  <span class="comment">// via an IntrusivePtr object. An object of a derived class</span></div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="comment">// might still copy itself via its copy constructor and take</span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="comment">// along a new base IntrusiveLockCounter object constructed via</span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  <span class="comment">// the default constructor, and thus have a correct reference</span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  <span class="comment">// count of 0, but derived classes should not try to provide</span></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <span class="comment">// their own assignment operators.</span><span class="comment"></span></div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> <span class="comment"> * This class cannot be copied. The copy constructor is deleted.</span></div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  <a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a3a298e554696034cccaeb30c72e2e085">IntrusiveLockCounter</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusiveLockCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr, with a thread safe reference count.. ">IntrusiveLockCounter</a>&) = <span class="keyword">delete</span>;<span class="comment"></span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span> <span class="comment"> * This class cannot be copied. The assignment operator is deleted.</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <a class="code" href="classCgu_1_1IntrusiveLockCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr, with a thread safe reference count.. ">IntrusiveLockCounter</a>& <a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a429e454085319660c1daf6ebeedf8fe4">operator=</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusiveLockCounter.html" title="This is a counter class providing the ref() and unref() functions required by IntrusivePtr, with a thread safe reference count.. ">IntrusiveLockCounter</a>&) = <span class="keyword">delete</span>;</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="comment"></span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="comment"> * Increments the reference count. This method does not throw.</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00378"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveLockCounter.html#afea5cfeec2d6f530b409830c058df789"> 378</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCgu_1_1IntrusiveLockCounter.html#afea5cfeec2d6f530b409830c058df789">ref</a>() noexcept {</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> <span class="preprocessor">#ifdef CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX</span></div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="preprocessor"></span> <a class="code" href="classCgu_1_1Thread_1_1Mutex_1_1Lock.html" title="A scoped locking class for exception safe Mutex locking. ">Thread::Mutex::Lock</a> lock(mutex); </div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  ++count;</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> <span class="preprocessor"></span> g_atomic_int_inc(&count);</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> <span class="preprocessor"></span> }</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="comment"></span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="comment"> * Decrements the reference count, and if the count reaches 0 deletes</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="comment"> * itself (ie the managed object). This method does not throw unless</span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> <span class="comment"> * the destructor of a derived class throws - that should never</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="comment"> * happen.</span></div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00393"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a1f6ca5710a72753db4ba75a4e6b5333c"> 393</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a1f6ca5710a72753db4ba75a4e6b5333c">unref</a>() {</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> <span class="preprocessor">#ifdef CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX</span></div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span> <span class="preprocessor"></span> mutex.lock(); </div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  --count;</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  <span class="keywordflow">if</span> (count == 0) {</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  mutex.unlock();</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keyword">delete</span> <span class="keyword">this</span>;</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  }</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <span class="keywordflow">else</span> mutex.unlock();</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span> <span class="preprocessor"></span> <span class="keywordflow">if</span> (g_atomic_int_dec_and_test(&count)) {</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="keyword">delete</span> <span class="keyword">this</span>;</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  }</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span> <span class="preprocessor"></span> }</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span> <span class="comment"></span></div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <span class="comment"> * By default, glib atomic functions are used to provide thread-safe</span></div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span> <span class="comment"> * manipulation of the reference count. However, the header file</span></div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> <span class="comment"> * intrusive_ptr.h can be textually amended before the library is</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="comment"> * compiled to define the symbol CGU_INTRUSIVE_LOCK_COUNTER_USE_MUTEX</span></div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span> <span class="comment"> * so as to use mutexes instead, which might be useful for some</span></div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="comment"> * debugging purposes. Were that to be done, Cgu::Thread::MutexError</span></div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> <span class="comment"> * might be thrown by this constructor if initialization of the mutex</span></div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> <span class="comment"> * fails.</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="comment"> * Otherwise, this constructor does not throw.</span></div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00421"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a3a298e554696034cccaeb30c72e2e085"> 421</a></span>  <a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a3a298e554696034cccaeb30c72e2e085">IntrusiveLockCounter</a>(): count(0) {}</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span> <span class="comment"></span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="comment"> * This destructor does not throw, unless the destructor of a derived</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="comment"> * class throws - that should never happen.</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00427"></a><span class="lineno"><a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a8d744278e06334efc17486416ca092c0"> 427</a></span>  <span class="keyword">virtual</span> <a class="code" href="classCgu_1_1IntrusiveLockCounter.html#a8d744278e06334efc17486416ca092c0">~IntrusiveLockCounter</a>() {}</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> };</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> </div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span> <span class="preprocessor">#if defined(CGU_USE_SMART_PTR_COMPARISON) || defined(DOXYGEN_PARSING)</span></div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span> <span class="comment">// we can use built-in operator == when comparing pointers referencing</span></div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span> <span class="comment">// different objects of the same type</span><span class="comment"></span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> <span class="comment"> * This comparison operator does not throw. It compares the addresses</span></div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> <span class="comment"> * of the managed objects.</span></div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> <span class="comment"> * Since 2.0.0-rc2</span></div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
<div class="line"><a name="l00443"></a><span class="lineno"><a class="code" href="group__handles.html#ga321638d351069d5051bae0167659a5d9"> 443</a></span> <span class="keywordtype">bool</span> <a class="code" href="group__handles.html#gae31f500ae48d467e4f19a85238317aeb">operator==</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<T></a>& s1, <span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<T></a>& s2) noexcept {</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  <span class="keywordflow">return</span> (s1.get() == s2.get());</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span> }</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> <span class="comment"></span></div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> <span class="comment"> * This comparison operator does not throw. It compares the addresses</span></div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> <span class="comment"> * of the managed objects.</span></div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span> <span class="comment"> * Since 2.0.0-rc2</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
<div class="line"><a name="l00456"></a><span class="lineno"><a class="code" href="group__handles.html#ga98c0b7299beec37a4cb12886bc34fc49"> 456</a></span> <span class="keywordtype">bool</span> <a class="code" href="group__handles.html#ga1a3dd375618ebb42260ee6c4c2478bd4">operator!=</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<T></a>& s1, <span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<T></a>& s2) noexcept {</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <span class="keywordflow">return</span> !(s1 == s2);</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span> }</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> </div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span> <span class="comment">// we must use std::less rather than the < built-in operator for</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span> <span class="comment">// pointers to objects not within the same array or object: "For</span></div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span> <span class="comment">// templates greater, less, greater_equal, and less_equal, the</span></div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> <span class="comment">// specializations for any pointer type yield a total order, even if</span></div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span> <span class="comment">// the built-in operators <, >, <=, >= do not." (para 20.3.3/8).</span><span class="comment"></span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span> <span class="comment"> * This comparison operator does not throw unless std::less applied to</span></div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span> <span class="comment"> * pointer types throws (which it would not do with any sane</span></div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span> <span class="comment"> * implementation). It compares the addresses of the managed objects.</span></div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span> <span class="comment"> * Since 2.0.0-rc2</span></div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
<div class="line"><a name="l00475"></a><span class="lineno"><a class="code" href="group__handles.html#gaf28ba044679b8faacf842e0830b2e125"> 475</a></span> <span class="keywordtype">bool</span> operator<(const IntrusivePtr<T>& s1, <span class="keyword">const</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">IntrusivePtr<T></a>& s2) {</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  <span class="keywordflow">return</span> std::less<T*>()(s1.get(), s2.get());</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> }</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> </div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> <span class="preprocessor">#endif // CGU_USE_SMART_PTR_COMPARISON</span></div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span> } <span class="comment">// namespace Cgu</span></div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span> </div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span> <span class="comment">// doxygen produces long filenames that tar can't handle:</span></div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span> <span class="comment">// we have generic documentation for std::hash specialisations</span></div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span> <span class="comment">// in doxygen.main.in</span></div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span> <span class="preprocessor">#if defined(CGU_USE_SMART_PTR_COMPARISON) && !defined(DOXYGEN_PARSING)</span></div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span> <span class="preprocessor"></span><span class="comment">/* This struct allows InstrusivePtr objects to be keys in unordered</span></div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span> <span class="comment"> associative containers */</span></div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span> <span class="keyword">namespace </span>std {</div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> <span class="keyword">template</span> <<span class="keyword">class</span> T></div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> <span class="keyword">struct </span>hash<Cgu::IntrusivePtr<T>> {</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <span class="keyword">typedef</span> std::size_t result_type;</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  <span class="keyword">typedef</span> <a class="code" href="classCgu_1_1IntrusivePtr.html" title="This is a smart pointer for managing objects allocated on freestore which maintain their own referenc...">Cgu::IntrusivePtr<T></a> argument_type;</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  result_type operator()(<span class="keyword">const</span> argument_type& s)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="comment">// this is fine: std::hash structs do not normally contain data and</span></div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  <span class="comment">// std::hash<T*> certainly won't, so we don't have overhead constructing</span></div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  <span class="comment">// std::hash<T*> on the fly</span></div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  <span class="keywordflow">return</span> <a class="code" href="classstd_1_1hash.html" title="A specialization of std::hash for Cgu::Callback::FunctorArg, Cgu::Callback::SafeFunctorArg, Cgu::GobjHandle, Cgu::GvarHandle, Cgu::IntrusivePtr, Cgu::SharedHandle, Cgu::SharedLockHandle, Cgu::SharedPtr and Cgu::SharedLockPtr so that such objects may be keys of unordered associative containers. ">std::hash<T*></a>()(s.get());</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  }</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> };</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span> } <span class="comment">// namespace std</span></div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span> <span class="preprocessor">#endif // CGU_USE_SMART_PTR_COMPARISON</span></div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span> <span class="preprocessor">#endif</span></div>
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