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<a href="a00272.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">// Allocators -*- C++ -*-</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 2001-2018 Free Software Foundation, Inc.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later version.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU General Public License for more details.</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/*</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * Copyright (c) 1996-1997</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Silicon Graphics Computer Systems, Inc.</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> *</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * Permission to use, copy, modify, distribute and sell this software</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * and its documentation for any purpose is hereby granted without fee,</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * provided that the above copyright notice appear in all copies and</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * that both that copyright notice and this permission notice appear</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * in supporting documentation. Silicon Graphics makes no</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * representations about the suitability of this software for any</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * purpose. It is provided "as is" without express or implied warranty.</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> <span class="comment">/** @file bits/allocator.h</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * This is an internal header file, included by other library headers.</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * Do not attempt to use it directly. @headername{memory}</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> */</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> </div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#ifndef _ALLOCATOR_H</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#define _ALLOCATOR_H 1</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> </div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#include <<a class="code" href="a00653.html">bits/c++allocator.h</a>></span> <span class="comment">// Define the base class to std::allocator.</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include <<a class="code" href="a00419.html">bits/memoryfwd.h</a>></span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#include <<a class="code" href="a00167.html">type_traits</a>></span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#define __cpp_lib_incomplete_container_elements 201505</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor"># define __cpp_lib_allocator_is_always_equal 201411</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> </div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">namespace </span><a class="code" href="a01538.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> {</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment"></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> <span class="comment"> * @addtogroup allocators</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"> */</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"> /// allocator<void> specialization.</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"></span> <span class="keyword">template</span><></div><div class="line"><a name="l00068"></a><span class="lineno"><a class="line" href="a04696.html"> 68</a></span>  <span class="keyword">class </span><a class="code" href="a04704.html">allocator</a><void></div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  {</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">typedef</span> <span class="keywordtype">size_t</span> size_type;</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">typedef</span> ptrdiff_t difference_type;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">typedef</span> <span class="keywordtype">void</span>* pointer;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="keywordtype">void</span>* const_pointer;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">typedef</span> <span class="keywordtype">void</span> value_type;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keyword">struct </span>rebind</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  { <span class="keyword">typedef</span> <a class="code" href="a04704.html">allocator<_Tp1></a> other; };</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> </div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">// 2103. std::allocator propagate_on_container_move_assignment</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keyword">typedef</span> <a class="code" href="a03040.html">true_type</a> <a class="code" href="a03040.html">propagate_on_container_move_assignment</a>;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">typedef</span> <a class="code" href="a03040.html">true_type</a> <a class="code" href="a03040.html">is_always_equal</a>;</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up, <span class="keyword">typename</span>... _Args></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  construct(_Up* __p, _Args&&... __args)</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  { ::new((<span class="keywordtype">void</span> *)__p) _Up(std::forward<_Args>(__args)...); }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> </div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordtype">void</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  destroy(_Up* __p) { __p->~_Up(); }</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="preprocessor">#endif</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"> 98</span> <span class="comment"></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"> * @brief The @a standard allocator, as per [20.4].</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> *</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> * See https://gcc.gnu.org/onlinedocs/libstdc++/manual/memory.html#std.util.memory.allocator</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * for further details.</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> *</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * @tparam _Tp Type of allocated object.</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> */</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="a04704.html"> 108</a></span>  <span class="keyword">class </span><a class="code" href="a04704.html">allocator</a> : <span class="keyword">public</span> <a class="code" href="a10432.html">__allocator_base</a><_Tp></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>:</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">typedef</span> <span class="keywordtype">size_t</span> size_type;</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">typedef</span> ptrdiff_t difference_type;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keyword">typedef</span> _Tp* pointer;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keyword">typedef</span> <span class="keyword">const</span> _Tp* const_pointer;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keyword">typedef</span> _Tp& reference;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">typedef</span> <span class="keyword">const</span> _Tp& const_reference;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">typedef</span> _Tp value_type;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span> </div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keyword">struct </span>rebind</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  { <span class="keyword">typedef</span> <a class="code" href="a04704.html">allocator<_Tp1></a> other; };</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="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="comment">// _GLIBCXX_RESOLVE_LIB_DEFECTS</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="comment">// 2103. std::allocator propagate_on_container_move_assignment</span></div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keyword">typedef</span> <a class="code" href="a03040.html">true_type</a> <a class="code" href="a03040.html">propagate_on_container_move_assignment</a>;</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span> </div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keyword">typedef</span> <a class="code" href="a03040.html">true_type</a> <a class="code" href="a03040.html">is_always_equal</a>;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> </div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <a class="code" href="a04704.html">allocator</a>() <span class="keywordflow">throw</span>() { }</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> </div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <a class="code" href="a04704.html">allocator</a>(<span class="keyword">const</span> <a class="code" href="a04704.html">allocator</a>& __a) <span class="keywordflow">throw</span>()</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  : <a class="code" href="a10432.html">__allocator_base<_Tp></a>(__a) { }</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> </div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1></div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <a class="code" href="a04704.html">allocator</a>(<span class="keyword">const</span> <a class="code" href="a04704.html">allocator<_Tp1></a>&) <span class="keywordflow">throw</span>() { }</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> </div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  ~<a class="code" href="a04704.html">allocator</a>() <span class="keywordflow">throw</span>() { }</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> </div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">// Inherit everything else.</span></div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  };</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>  <span class="keyword">template</span><<span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  operator==(<span class="keyword">const</span> <a class="code" href="a04704.html">allocator<_T1></a>&, <span class="keyword">const</span> <a class="code" href="a04704.html">allocator<_T2></a>&)</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  _GLIBCXX_USE_NOEXCEPT</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  { <span class="keywordflow">return</span> <span class="keyword">true</span>; }</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> </div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  operator==(<span class="keyword">const</span> allocator<_Tp>&, <span class="keyword">const</span> allocator<_Tp>&)</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  _GLIBCXX_USE_NOEXCEPT</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  { <span class="keywordflow">return</span> <span class="keyword">true</span>; }</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span> </div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2></div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  operator!=(<span class="keyword">const</span> allocator<_T1>&, <span class="keyword">const</span> allocator<_T2>&)</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  _GLIBCXX_USE_NOEXCEPT</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</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>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  operator!=(<span class="keyword">const</span> allocator<_Tp>&, <span class="keyword">const</span> allocator<_Tp>&)</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  _GLIBCXX_USE_NOEXCEPT</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  { <span class="keywordflow">return</span> <span class="keyword">false</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="comment">// Invalid allocator<cv T> partial specializations.</span></div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  <span class="comment">// allocator_traits::rebind_alloc can be used to form a valid allocator type.</span></div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keyword">class </span>allocator<const _Tp></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="keyword">public</span>:</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keyword">typedef</span> _Tp value_type;</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up> allocator(<span class="keyword">const</span> allocator<_Up>&) { }</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  };</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  <span class="keyword">class </span>allocator<volatile _Tp></div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  {</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keyword">typedef</span> _Tp value_type;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up> allocator(<span class="keyword">const</span> allocator<_Up>&) { }</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  };</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="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keyword">class </span>allocator<const volatile _Tp></div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  {</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keyword">typedef</span> _Tp value_type;</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Up> allocator(<span class="keyword">const</span> allocator<_Up>&) { }</div><div class="line"><a name="l00192"></a><span class="lineno"> 192</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"> /// @} group allocator</span></div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="comment"></span></div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="comment">// Inhibit implicit instantiations for required instantiations,</span></div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="comment">// which are defined via explicit instantiations elsewhere.</span></div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="preprocessor">#if _GLIBCXX_EXTERN_TEMPLATE</span></div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>allocator<char>;</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>allocator<wchar_t>;</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span> </div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="comment">// Undefine.</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="preprocessor">#undef __allocator_base</span></div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span> </div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="comment">// To implement Option 3 of DR 431.</span></div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc, <span class="keywordtype">bool</span> = __is_empty(_Alloc)></div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keyword">struct </span>__alloc_swap</div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  { <span class="keyword">static</span> <span class="keywordtype">void</span> _S_do_it(_Alloc&, _Alloc&) _GLIBCXX_NOEXCEPT { } };</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span> </div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="keyword">struct </span>__alloc_swap<_Alloc, false></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="keyword">static</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  _S_do_it(_Alloc& __one, _Alloc& __two) _GLIBCXX_NOEXCEPT</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  {</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  <span class="comment">// Precondition: swappable allocators.</span></div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">if</span> (__one != __two)</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  swap(__one, __two);</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  }</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  };</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> </div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  <span class="comment">// Optimize for stateless allocators.</span></div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc, <span class="keywordtype">bool</span> = __is_empty(_Alloc)></div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keyword">struct </span>__alloc_neq</div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  {</div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keyword">static</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  _S_do_it(<span class="keyword">const</span> _Alloc&, <span class="keyword">const</span> _Alloc&)</div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div><div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  };</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> </div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc></div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keyword">struct </span>__alloc_neq<_Alloc, false></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="keyword">static</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  _S_do_it(<span class="keyword">const</span> _Alloc& __one, <span class="keyword">const</span> _Alloc& __two)</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  { <span class="keywordflow">return</span> __one != __two; }</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  };</div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> </div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keywordtype">bool</span></div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  = __or_<is_copy_constructible<typename _Tp::value_type>,</div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  is_nothrow_move_constructible<typename _Tp::value_type>>::value></div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <span class="keyword">struct </span>__shrink_to_fit_aux</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  { <span class="keyword">static</span> <span class="keywordtype">bool</span> _S_do_it(_Tp&) noexcept { <span class="keywordflow">return</span> <span class="keyword">false</span>; } };</div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div><div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keyword">struct </span>__shrink_to_fit_aux<_Tp, true></div><div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  {</div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keyword">static</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  _S_do_it(_Tp& __c) noexcept</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  {</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="preprocessor">#if __cpp_exceptions</span></div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">try</span></div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  {</div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  _Tp(__make_move_if_noexcept_iterator(__c.begin()),</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  __make_move_if_noexcept_iterator(__c.end()),</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  __c.get_allocator()).swap(__c);</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">return</span> <span class="keyword">true</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="keywordflow">catch</span>(...)</div><div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  { <span class="keywordflow">return</span> <span class="keyword">false</span>; }</div><div class="line"><a name="l00263"></a><span class="lineno"> 263</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00266"></a><span class="lineno"> 266</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"> 268</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span> } <span class="comment">// namespace std</span></div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span> </div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="a04704_html"><div class="ttname"><a href="a04704.html">std::allocator</a></div><div class="ttdoc">The standard allocator, as per [20.4].</div><div class="ttdef"><b>Definition:</b> <a href="a00272_source.html#l00108">allocator.h:108</a></div></div>
<div class="ttc" id="a10432_html"><div class="ttname"><a href="a10432.html">__gnu_cxx::new_allocator</a></div><div class="ttdoc">An allocator that uses global new, as per [20.4].This is precisely the allocator defined in the C++ S...</div><div class="ttdef"><b>Definition:</b> <a href="a01052_source.html#l00058">new_allocator.h:58</a></div></div>
<div class="ttc" id="a00167_html"><div class="ttname"><a href="a00167.html">type_traits</a></div></div>
<div class="ttc" id="a01538_html"><div class="ttname"><a href="a01538.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a03040_html"><div class="ttname"><a href="a03040.html">std::integral_constant</a></div><div class="ttdoc">integral_constant</div><div class="ttdef"><b>Definition:</b> <a href="a00167_source.html#l00057">type_traits:57</a></div></div>
<div class="ttc" id="a00653_html"><div class="ttname"><a href="a00653.html">c++allocator.h</a></div></div>
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