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<a href="a00107.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">// <memory> -*- 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) 1997-1999</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"></span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">/** @file include/memory</span></div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * This is a Standard C++ Library header.</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 _GLIBCXX_MEMORY</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#define _GLIBCXX_MEMORY 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">#pragma GCC system_header</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment"></span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">/**</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment"> * @defgroup memory Memory</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * @ingroup utilities</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"> * Components for memory allocation, deallocation, and management.</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> <span class="comment"></span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="comment">/**</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="comment"> * @defgroup pointer_abstractions Pointer Abstractions</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="comment"> * @ingroup memory</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment"> *</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment"> * Smart pointers, etc.</span></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> </div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor">#include <<a class="code" href="a00530.html">bits/stl_algobase.h</a>></span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#include <<a class="code" href="a00272.html">bits/allocator.h</a>></span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#include <<a class="code" href="a00536.html">bits/stl_construct.h</a>></span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#include <<a class="code" href="a00596.html">bits/stl_uninitialized.h</a>></span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor">#include <<a class="code" href="a00590.html">bits/stl_tempbuf.h</a>></span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#include <<a class="code" href="a00578.html">bits/stl_raw_storage_iter.h</a>></span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> </div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor"># include <<a class="code" href="a00026.html">exception</a>></span> <span class="comment">// std::exception</span></div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor"># include <<a class="code" href="a00035.html">typeinfo</a>></span> <span class="comment">// std::type_info in get_deleter</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor"># include <<a class="code" href="a00083.html">iosfwd</a>></span> <span class="comment">// std::basic_ostream</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor"># include <<a class="code" href="a01022.html">ext/atomicity.h</a>></span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="preprocessor"># include <<a class="code" href="a01034.html">ext/concurrence.h</a>></span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor"># include <<a class="code" href="a00356.html">bits/functexcept.h</a>></span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor"># include <<a class="code" href="a00542.html">bits/stl_function.h</a>></span> <span class="comment">// std::less</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor"># include <bits/uses_allocator.h></span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor"># include <<a class="code" href="a00167.html">type_traits</a>></span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor"># include <<a class="code" href="a00743.html">debug/debug.h</a>></span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor"># include <<a class="code" href="a00620.html">bits/unique_ptr.h</a>></span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor"># include <bits/shared_ptr.h></span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor"># include <<a class="code" href="a00503.html">bits/shared_ptr_atomic.h</a>></span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor"># if _GLIBCXX_USE_DEPRECATED</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor"># include <<a class="code" href="a00719.html">backward/auto_ptr.h</a>></span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor"># endif</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor"># include <<a class="code" href="a00719.html">backward/auto_ptr.h</a>></span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor"># include <<a class="code" href="a00236.html">cstdint</a>></span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="preprocessor"># ifdef _GLIBCXX_USE_C99_STDINT_TR1</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="keyword">namespace </span><a class="code" href="a01538.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"></span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">/**</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * @brief Fit aligned storage in buffer.</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"> * [ptr.align]</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"> * This function tries to fit @a __size bytes of storage with alignment</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * @a __align into the buffer @a __ptr of size @a __space bytes. If such</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * a buffer fits then @a __ptr is changed to point to the first byte of the</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * aligned storage and @a __space is reduced by the bytes used for alignment.</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="comment"> * @param __align A fundamental or extended alignment value.</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> * @param __size Size of the aligned storage required.</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> * @param __ptr Pointer to a buffer of @a __space bytes.</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> * @param __space Size of the buffer pointed to by @a __ptr.</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> * @return the updated pointer if the aligned storage fits, otherwise nullptr.</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> */</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> <span class="keyword">inline</span> <span class="keywordtype">void</span>*</div><div class="line"><a name="l00114"></a><span class="lineno"><a class="line" href="a01538.html#a7a0544b4d4e49cb7f4668d8ce7b914d5"> 114</a></span> <a class="code" href="a01538.html#a7a0544b4d4e49cb7f4668d8ce7b914d5">align</a>(<span class="keywordtype">size_t</span> __align, <span class="keywordtype">size_t</span> __size, <span class="keywordtype">void</span>*& __ptr, <span class="keywordtype">size_t</span>& __space) noexcept</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> {</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keyword">const</span> <span class="keyword">auto</span> __intptr = reinterpret_cast<uintptr_t>(__ptr);</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">const</span> <span class="keyword">auto</span> __aligned = (__intptr - 1u + __align) & -__align;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">const</span> <span class="keyword">auto</span> __diff = __aligned - __intptr;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">if</span> ((__size + __diff) > __space)</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">else</span></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>  __space -= __diff;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">return</span> __ptr = reinterpret_cast<void*>(__aligned);</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> }</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="comment">// 20.7.4 [util.dynamic.safety], pointer safety</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="keyword">enum class</span> pointer_safety { relaxed, preferred, strict };</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> declare_reachable(<span class="keywordtype">void</span>*) { }</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="keyword">template</span> <<span class="keyword">typename</span> _Tp></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">inline</span> _Tp*</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  undeclare_reachable(_Tp* __p) { <span class="keywordflow">return</span> __p; }</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> <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> declare_no_pointers(<span class="keywordtype">char</span>*, <span class="keywordtype">size_t</span>) { }</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span> <span class="keyword">inline</span> <span class="keywordtype">void</span></div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> undeclare_no_pointers(<span class="keywordtype">char</span>*, <span class="keywordtype">size_t</span>) { }</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="keyword">inline</span> pointer_safety</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> get_pointer_safety() noexcept { <span class="keywordflow">return</span> pointer_safety::relaxed; }</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> </div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="preprocessor">#endif // _GLIBCXX_USE_C99_STDINT_TR1</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> <span class="preprocessor">#endif // C++11</span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="preprocessor">#endif </span><span class="comment">/* _GLIBCXX_MEMORY */</span><span class="preprocessor"></span></div><div class="ttc" id="a00536_html"><div class="ttname"><a href="a00536.html">stl_construct.h</a></div></div>
<div class="ttc" id="a00356_html"><div class="ttname"><a href="a00356.html">functexcept.h</a></div></div>
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