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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> // <memory> -*- C++ -*-</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> // Copyright (C) 2001-2018 Free Software Foundation, Inc.</div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> //</div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> // This file is part of the GNU ISO C++ Library. This library is free</div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> // software; you can redistribute it and/or modify it under the</div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> // terms of the GNU General Public License as published by the</div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> // Free Software Foundation; either version 3, or (at your option)</div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> // any later version.</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> // This library is distributed in the hope that it will be useful,</div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> // but WITHOUT ANY WARRANTY; without even the implied warranty of</div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> // GNU General Public License for more details.</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> // Under Section 7 of GPL version 3, you are granted additional</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> // permissions described in the GCC Runtime Library Exception, version</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> // 3.1, as published by the Free Software Foundation.</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> // You should have received a copy of the GNU General Public License and</div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> // a copy of the GCC Runtime Library Exception along with this program;</div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> // <http://www.gnu.org/licenses/>.</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> /*</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  * Copyright (c) 1997-1999</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  * Silicon Graphics Computer Systems, Inc.</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  *</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  * Permission to use, copy, modify, distribute and sell this software</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  * and its documentation for any purpose is hereby granted without fee,</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  * provided that the above copyright notice appear in all copies and</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  * that both that copyright notice and this permission notice appear</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  * in supporting documentation. Silicon Graphics makes no</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  * representations about the suitability of this software for any</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  * purpose. It is provided "as is" without express or implied warranty.</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  *</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</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> /** @file include/memory</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  * This is a Standard C++ Library header.</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</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> #ifndef _GLIBCXX_MEMORY</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> #define _GLIBCXX_MEMORY 1</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> #pragma GCC system_header</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> /**</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  * @defgroup memory Memory</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  * @ingroup utilities</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>  * Components for memory allocation, deallocation, and management.</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</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> /**</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  * @defgroup pointer_abstractions Pointer Abstractions</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  * @ingroup memory</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>  * Smart pointers, etc.</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</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> #include <bits/stl_algobase.h></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> #include <bits/allocator.h></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> #include <bits/stl_construct.h></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> #include <bits/stl_uninitialized.h></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> #include <bits/stl_tempbuf.h></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> #include <bits/stl_raw_storage_iter.h></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> #if __cplusplus >= 201103L</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> # include <exception> // std::exception</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> # include <typeinfo> // std::type_info in get_deleter</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> # include <iosfwd> // std::basic_ostream</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> # include <ext/atomicity.h></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> # include <ext/concurrence.h></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> # include <bits/functexcept.h></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> # include <bits/stl_function.h> // std::less</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> # include <bits/uses_allocator.h></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span> # include <type_traits></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> # include <debug/debug.h></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> # include <bits/unique_ptr.h></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> # include <bits/shared_ptr.h></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span> # include <bits/shared_ptr_atomic.h></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> # if _GLIBCXX_USE_DEPRECATED</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> # include <backward/auto_ptr.h></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> # endif</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> #else</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> # include <backward/auto_ptr.h></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span> #endif</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> #if __cplusplus >= 201103L</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> # include <cstdint></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> # ifdef _GLIBCXX_USE_C99_STDINT_TR1</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> namespace std _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> </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>  * @brief Fit aligned storage in buffer.</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  *</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  * [ptr.align]</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  *</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  * This function tries to fit @a __size bytes of storage with alignment</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  * @a __align into the buffer @a __ptr of size @a __space bytes. If such</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  * a buffer fits then @a __ptr is changed to point to the first byte of the</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  * aligned storage and @a __space is reduced by the bytes used for alignment.</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  *</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  * @param __align A fundamental or extended alignment value.</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  * @param __size Size of the aligned storage required.</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  * @param __ptr Pointer to a buffer of @a __space bytes.</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  * @param __space Size of the buffer pointed to by @a __ptr.</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  * @return the updated pointer if the aligned storage fits, otherwise nullptr.</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  */</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> inline void*</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> align(size_t __align, size_t __size, void*& __ptr, size_t& __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>  const auto __intptr = reinterpret_cast<uintptr_t>(__ptr);</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  const auto __aligned = (__intptr - 1u + __align) & -__align;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  const auto __diff = __aligned - __intptr;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  if ((__size + __diff) > __space)</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  return nullptr;</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  else</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>  return __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> // 20.7.4 [util.dynamic.safety], pointer safety</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> enum class 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> inline void</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> declare_reachable(void*) { }</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> template <typename _Tp></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  inline _Tp*</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  undeclare_reachable(_Tp* __p) { return __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> inline void</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> declare_no_pointers(char*, size_t) { }</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> inline void</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> undeclare_no_pointers(char*, size_t) { }</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> inline pointer_safety</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span> get_pointer_safety() noexcept { return 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> } // namespace</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span> #endif // _GLIBCXX_USE_C99_STDINT_TR1</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> #endif // C++11</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> #endif /* _GLIBCXX_MEMORY */</div></div><!-- fragment --></div><!-- contents -->
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