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<a href="gvar__handle_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) 2010 and 2011 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_GVAR_HANDLE_H</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor"></span><span class="preprocessor">#define CGU_GVAR_HANDLE_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="preprocessor">#include <functional></span> <span class="comment">// for std::less and std::hash<T*></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include <cstddef></span> <span class="comment">// for std::size_t</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#include <glib.h></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">#if defined(DOXYGEN_PARSING) || GLIB_CHECK_VERSION(2,24,0)</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</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="l00050"></a><span class="lineno"> 50</span> <span class="comment"></span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * @addtogroup handles handles and smart pointers</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">namespace </span>Cgu {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"></span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> * @class GvarHandle gvar_handle.h c++-gtk-utils/gvar_handle.h</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * @brief This is a handle for managing the reference count of</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"> * GVariant objects.</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * @sa GobjHandle</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * This is a class which manages the reference count of GVariant</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * objects. It does not maintain its own reference count, but</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * interfaces with that kept by the GVariant object.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> * GVariant objects created with one of the g_variant_new*() functions</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * are created with a floating reference. The constructor of a</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * GvarHandle which takes a pointer will automatically take</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * ownership of such a newly created GVariant object, by calling</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * g_variant_ref_sink().</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * GVariant objects which are obtained by one of the g_variant_get*()</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> * or similar getter functions, such as g_variant_get_child_value(),</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> * g_variant_get_variant(), g_variant_get() with a "v" or "(v)" format</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment"> * string, or g_variant_iter_next_value(), or as the return value of a</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"> * dbus method call in gio's dbus implementation such as</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> * g_dbus_connection_call_sync(), g_dbus_connection_call_finish(),</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * g_dbus_proxy_call_sync() or g_dbus_proxy_call_finish(), are not</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> * created with a floating reference (the variant normally already</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> * exists), but instead the reference count is incremented by the</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * function concerned when the object is passed out to the user, so</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * giving ownership to the user.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * It follows that g_variant_ref_sink() is not called by the</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * constructor taking a pointer if the floating reference has already</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * been sunk. This behaviour will ensure that the handle behaves the</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * same whether it is passed a GVariant object from one of the</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * g_variant_new*() functions, or from one of the g_variant_get*() and</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * other getter functions mentioned above. One consequence is that if</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * the constructor taking a pointer is passed a pointer which has</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> * already been passed to and is managed by another GvarHandle object,</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"> * the user must call g_variant_ref() herself explicitly: but GVariant</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> * objects already owned by a GvarHandle should not normally be passed</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> * to another GvarHandle that way, as GvarHandles have a copy</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> * constructor and assignment operator which will increment the</span></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * reference count automatically.</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> * In other words, invoke the constructor taking a pointer only with a</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * newly created GVariant object, or with a GVariant object directly</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * handed out by a GVariant getter function or as the return value of</span></div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * a gio dbus method call, and everything else will take care of</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * itself. In this respect, GvarHandles work the same way as</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * conventional shared pointer implementations managing objects</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> * allocated on free store. The same applies to the reset() method.</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * Because glib and gio themselves increment the reference count of a</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> * GVariant object where they need to take ownership, an</span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> * already-managed object held by a GvarHandle can safely be passed by</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> * pointer as the first argument of one of glib's g_variant_*()</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> * functions or as an argument to one of gio's dbus functions, and</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="comment"> * that is one of its intended usages. For that purpose, the pointer</span></div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"> * can be obtained by means of the operatorT*() type conversion</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> * operator (which returns the underlying pointer), or by explicitly</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * calling the get() method to obtain the underlying pointer.</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * By automatically handling GVariant reference counts, GvarHandle</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * makes GVariant objects exception-safe, and they also permit</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * GVariant objects to be kept in standard C++ containers.</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * GVariant objects are thread safe, including their reference counts.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * This means that a GVariant object may be held by GvarHandles in</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> * containers in different threads, and accessed concurrently in those</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> * different threads.</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> * Typical usage might be, for example, as follows:</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * @code</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> * // execute a method "TwoInts" taking two 'int' arguments and</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> * // returning a string-array via g_dbus_proxy_call_sync()</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> * gint32 a = 2;</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * gint32 b = 10;</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> * Cgu::GvarHandle result(g_dbus_proxy_call_sync(proxy,</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"> * "TwoInts",</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> * g_variant_new("(ii)", a, b),</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> <span class="comment"> * G_DBUS_CALL_FLAGS_NONE,</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"> * -1,</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> * 0,</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"> * 0));</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span> <span class="comment"> * if (!result.get()) {</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="comment"> * g_critical("Failed to execute method TwoInts");</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"> * execute_error_strategy();</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> * }</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"> * else {</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> <span class="comment"> * // gio's dbus implementation wraps all return</span></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="comment"> * // values in a tuple: first extract the string-array</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> <span class="comment"> * // from the tuple</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> <span class="comment"> * Cgu::GvarHandle sa_variant(g_variant_get_child_value(result, 0));</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> * // free str_arr with g_strfreev()</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="comment"> * gchar** str_arr = g_variant_dup_strv(sa_variant, 0);</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> * }</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"> * @endcode</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> <span class="comment"> * Further examples of the use of GvarHandle, see @ref Variants</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"> 157</span> <span class="comment"> * @note This class is only available if glib >= 2.24.0 is installed.</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
<div class="line"><a name="l00160"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html"> 160</a></span> <span class="keyword">class </span><a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a> {</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  GVariant* obj_p;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> </div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  <span class="keywordtype">void</span> unreference() noexcept {</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">if</span> (obj_p) g_variant_unref(obj_p);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  }</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> </div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordtype">void</span> reference() noexcept {</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="keywordflow">if</span> (obj_p) g_variant_ref(obj_p);</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">public</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"> * The constructor does not throw. g_variant_ref_sink() is called if</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> * the managed object has a floating reference.</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"> * @param ptr The GVariant object which the GvarHandle is to manage</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="comment"> * (if any).</span></div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"> * @note The pointer passed, if not NULL, should not normally already</span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"> * have been given to and so managed by any other GvarHandle object.</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> * Use the copy constructor instead instead in that case.</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00183"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html#aa4d1d65e77d223d884b6048c098f0229"> 183</a></span>  <span class="keyword">explicit</span> <a class="code" href="classCgu_1_1GvarHandle.html#aa4d1d65e77d223d884b6048c098f0229">GvarHandle</a>(GVariant* ptr = 0) noexcept {</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  obj_p = ptr;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> </div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// if an object with a floating reference has been passed to this constructor,</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">// take ownership of it</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">if</span> (ptr && g_variant_is_floating(ptr)) {</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  g_variant_ref_sink(ptr);</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  }</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  }</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="comment"></span></div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span> <span class="comment"> * Causes the handle to cease to manage its managed object (if any)</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"> * and decrements its reference count, so destroying it if the</span></div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"> * reference count thereby becomes 0. If the argument passed is not</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> * NULL, the handle will manage the new GVariant object passed and</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> * g_variant_ref_sink() is called if the new object has a floating</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"> * reference. This method does not throw.</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> * @param ptr NULL (the default), or a new GVariant object to manage.</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="comment"> * @note The pointer passed, if not NULL, should not normally already</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> <span class="comment"> * have been given to and so managed by any other GvarHandle object.</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> * Use the assignment operator instead in that case.</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00205"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html#a09d1d388ad0ef26d862e3f0052a52625"> 205</a></span>  <span class="keywordtype">void</span> <a class="code" href="classCgu_1_1GvarHandle.html#a09d1d388ad0ef26d862e3f0052a52625">reset</a>(GVariant* ptr = 0) noexcept {</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  </div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  unreference();</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  obj_p = ptr;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> </div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">// if an object with a floating reference has been passed to this method,</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// take ownership of it</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keywordflow">if</span> (ptr && g_variant_is_floating(ptr)) {</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  g_variant_ref_sink(ptr);</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  }</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  }</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"></span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * The copy constructor does not throw. It increments the reference</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> * count of the managed object.</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * @param gvar The handle to be copied.</span></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"><a class="code" href="classCgu_1_1GvarHandle.html#a5f780c9b28391e5974f56d5a6772d27f"> 222</a></span>  <a class="code" href="classCgu_1_1GvarHandle.html#a5f780c9b28391e5974f56d5a6772d27f">GvarHandle</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& gvar) noexcept {</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  obj_p = gvar.obj_p;</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  reference();</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  }</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"></span></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"> * The move constructor does not throw. It has move semantics.</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * @param gvar The handle to be moved.</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html#afca935799340fdb8c6ce77d86b5f4867"> 231</a></span>  <a class="code" href="classCgu_1_1GvarHandle.html#afca935799340fdb8c6ce77d86b5f4867">GvarHandle</a>(<a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>&& gvar) noexcept {</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  obj_p = gvar.obj_p;</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  gvar.obj_p = 0;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</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"> /**</span></div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> * This method does not throw. It decrements the reference count of</span></div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> * the former managed object (if any), so destroying it if the</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> * reference count thereby becomes 0, and increments the reference</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> * count of the new managed GVariant object.</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"> * @param gvar The assignor.</span></div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> * @return The GvarHandle object after assignment.</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_1GvarHandle.html#a3d0f1cce1387ed93f8759ced9b6652f5"> 244</a></span>  <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& <a class="code" href="classCgu_1_1GvarHandle.html#a3d0f1cce1387ed93f8759ced9b6652f5">operator=</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& gvar) noexcept {</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <span class="comment">// check whether we are already referencing this object -</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="comment">// if so make this a null op. This will also deal with</span></div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="comment">// self-assignment</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  <span class="keywordflow">if</span> (obj_p != gvar.obj_p) {</div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> </div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="comment">// first unreference any object referenced by this handle</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  unreference();</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> </div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="comment">// now inherit the GVariant from the assigning handle</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="comment">// and reference it</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  obj_p = gvar.obj_p;</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  reference();</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  }</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  }</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"></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 method does not throw. It decrements the reference count of</span></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span> <span class="comment"> * the former managed object (if any), so destroying it if the</span></div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="comment"> * reference count thereby becomes 0, and has move semantics with</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="comment"> * respect to the new managed object.</span></div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> <span class="comment"> * @param gvar The handle to be moved.</span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span> <span class="comment"> * @return The GvarHandle object after the move operation.</span></div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html#abc9954951a4fb27d2d38ab427b5d67af"> 270</a></span>  <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& <a class="code" href="classCgu_1_1GvarHandle.html#abc9954951a4fb27d2d38ab427b5d67af">operator=</a>(<a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>&& gvar) noexcept {</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span> </div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="comment">// check for self-assignment</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">if</span> (<span class="keyword">this</span> != &gvar) {</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span> </div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">// first unreference any object referenced by this handle</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  unreference();</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> </div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="comment">// now inherit the GVariant from the moving handle</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  obj_p = gvar.obj_p;</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  gvar.obj_p = 0;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  }</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</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"> /**</span></div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span> <span class="comment"> * This method does not throw.</span></div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> <span class="comment"> * @return A pointer to the handled GVariant object (or NULL if none</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="comment"> * is handled).</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"><a class="code" href="classCgu_1_1GvarHandle.html#a491cc6a805a79683efe1c92b8f195221"> 290</a></span>  GVariant* <span class="keyword">get</span>() <span class="keyword">const</span> noexcept {<span class="keywordflow">return</span> obj_p;}</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"> 292</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="comment"> * This method does not throw.</span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="comment"> * @return A pointer to the handled GVariant object (or NULL if none</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="comment"> * is handled).</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html#a2e917fea31668962ae98fd176fe5f201"> 297</a></span>  <span class="keyword">operator</span> GVariant*() <span class="keyword">const</span> noexcept {<span class="keywordflow">return</span> obj_p;}</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"></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"> 300</span> <span class="comment"> * The destructor does not throw. It decrements the reference count</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> * of the managed object (if any), so destroying it if the reference</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment"> * count thereby becomes 0.</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00304"></a><span class="lineno"><a class="code" href="classCgu_1_1GvarHandle.html#a351a6c46e9673634ea8034e145bbd482"> 304</a></span>  <a class="code" href="classCgu_1_1GvarHandle.html#a351a6c46e9673634ea8034e145bbd482">~GvarHandle</a>() {unreference();}</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> };</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> </div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="preprocessor">#if defined(CGU_USE_SMART_PTR_COMPARISON) || defined(DOXYGEN_PARSING)</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="comment">// we can use built-in operator == when comparing pointers referencing</span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment">// different objects of the same type</span><span class="comment"></span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> <span class="comment"> * @ingroup handles</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"> 314</span> <span class="comment"> * This comparison operator does not throw. It compares the addresses</span></div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span> <span class="comment"> * of the managed objects.</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"> * Since 2.0.0-rc2</span></div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00319"></a><span class="lineno"><a class="code" href="group__handles.html#ga88bb389d92da0085d2ac96886e2f4508"> 319</a></span> <span class="keyword">inline</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_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& h1, <span class="keyword">const</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& h2) noexcept {</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  <span class="keywordflow">return</span> (h1.get() == h2.get());</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span> }</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span> <span class="comment"></span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span> <span class="comment"> * This comparison operator does not throw. It compares the addresses</span></div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"> * of the managed objects.</span></div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="comment"> * Since 2.0.0-rc2</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"><a class="code" href="group__handles.html#ga24dbacf878805c38599a8e4c9d84cf95"> 331</a></span> <span class="keyword">inline</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_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& h1, <span class="keyword">const</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& h2) noexcept {</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="keywordflow">return</span> !(h1 == h2);</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> }</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> </div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="comment">// we must use std::less rather than the < built-in operator for</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="comment">// pointers to objects not within the same array or object: "For</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="comment">// templates greater, less, greater_equal, and less_equal, the</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment">// specializations for any pointer type yield a total order, even if</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</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="l00340"></a><span class="lineno"> 340</span> <span class="comment">/**</span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="comment"> * @ingroup handles</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="comment"> * This comparison operator does not throw unless std::less applied to</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment"> * pointer types throws (which it would not do with any sane</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment"> * implementation). It compares the addresses of the managed objects.</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"> * Since 2.0.0-rc2</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00349"></a><span class="lineno"><a class="code" href="group__handles.html#ga187d72cb5619107484ecfc51393302c4"> 349</a></span> <span class="keyword">inline</span> <span class="keywordtype">bool</span> <a class="code" href="group__handles.html#gae28b173eb28864721ad19cf0b511aa1a">operator<</a>(<span class="keyword">const</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& h1, <span class="keyword">const</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">GvarHandle</a>& h2) {</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordflow">return</span> std::less<GVariant*>()(h1.<a class="code" href="classCgu_1_1GvarHandle.html#a491cc6a805a79683efe1c92b8f195221">get</a>(), h2.<a class="code" href="classCgu_1_1GvarHandle.html#a491cc6a805a79683efe1c92b8f195221">get</a>());</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> }</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> </div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="preprocessor">#endif // CGU_USE_SMART_PTR_COMPARISON</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span> } <span class="comment">// namespace Cgu</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span> </div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span> <span class="comment">// doxygen produces long filenames that tar can't handle:</span></div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span> <span class="comment">// we have generic documentation for std::hash specialisations</span></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span> <span class="comment">// in doxygen.main.in</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> <span class="preprocessor">#if defined(CGU_USE_SMART_PTR_COMPARISON) && !defined(DOXYGEN_PARSING)</span></div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span> <span class="preprocessor"></span><span class="comment">/* This struct allows GvarHandle objects to be keys in unordered</span></div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span> <span class="comment"> associative containers */</span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> <span class="keyword">namespace </span>std {</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> <span class="keyword">template</span> <></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span> <span class="keyword">struct </span>hash<Cgu::GvarHandle> {</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keyword">typedef</span> std::size_t result_type;</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <span class="keyword">typedef</span> <a class="code" href="classCgu_1_1GvarHandle.html" title="This is a handle for managing the reference count of GVariant objects. ">Cgu::GvarHandle</a> argument_type;</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  result_type operator()(<span class="keyword">const</span> argument_type& h)<span class="keyword"> const </span>{</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  <span class="comment">// this is fine: std::hash structs do not normally contain data and</span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  <span class="comment">// std::hash<T*> certainly won't, so we don't have overhead constructing</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="comment">// std::hash<T*> on the fly</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</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<GVariant*></a>()(h.get());</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  }</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  };</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span> } <span class="comment">// namespace std</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="preprocessor">#endif // CGU_USE_SMART_PTR_COMPARISON</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> <span class="preprocessor"></span><span class="preprocessor">#warning GvarHandle not available: glib >= 2.24.0 is required</span></div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/*GLIB_CHECK_VERSION(2,24,0)*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="preprocessor">#endif </span><span class="comment">/*CGU_GVAR_HANDLE_H*/</span><span class="preprocessor"></span></div>
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