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211 lines
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211 lines
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3 years ago
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<title>LCOV - test.info - 9/ext/aligned_buffer.h</title>
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<td width="10%" class="headerItem">Current view:</td>
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<td width="35%" class="headerValue"><a href="../../index.html">top level</a> - <a href="index.html">9/ext</a> - aligned_buffer.h<span style="font-size: 80%;"> (source / <a href="aligned_buffer.h.func-sort-c.html">functions</a>)</span></td>
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<td class="headerItem">Test:</td>
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<td class="headerValue">test.info</td>
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<td></td>
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<td class="headerItem">Lines:</td>
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<td class="headerCovTableEntry">8</td>
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<td class="headerCovTableEntry">8</td>
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<td class="headerItem">Date:</td>
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<td class="headerValue">2022-06-07 00:30:42</td>
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<td class="headerItem">Functions:</td>
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<td class="headerCovTableEntry">4</td>
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<pre class="sourceHeading"> Branch data Line data Source code</pre>
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<pre class="source">
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<a name="1"><span class="lineNum"> 1 </span> : : // Aligned memory buffer -*- C++ -*-</a>
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<a name="2"><span class="lineNum"> 2 </span> : : </a>
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<a name="3"><span class="lineNum"> 3 </span> : : // Copyright (C) 2013-2019 Free Software Foundation, Inc.</a>
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<a name="4"><span class="lineNum"> 4 </span> : : //</a>
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<a name="5"><span class="lineNum"> 5 </span> : : // This file is part of the GNU ISO C++ Library. This library is free</a>
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<a name="6"><span class="lineNum"> 6 </span> : : // software; you can redistribute it and/or modify it under the</a>
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<a name="7"><span class="lineNum"> 7 </span> : : // terms of the GNU General Public License as published by the</a>
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<a name="8"><span class="lineNum"> 8 </span> : : // Free Software Foundation; either version 3, or (at your option)</a>
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<a name="9"><span class="lineNum"> 9 </span> : : // any later version.</a>
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<a name="10"><span class="lineNum"> 10 </span> : : </a>
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<a name="11"><span class="lineNum"> 11 </span> : : // This library is distributed in the hope that it will be useful,</a>
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<a name="12"><span class="lineNum"> 12 </span> : : // but WITHOUT ANY WARRANTY; without even the implied warranty of</a>
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<a name="13"><span class="lineNum"> 13 </span> : : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</a>
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<a name="14"><span class="lineNum"> 14 </span> : : // GNU General Public License for more details.</a>
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<a name="15"><span class="lineNum"> 15 </span> : : </a>
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<a name="16"><span class="lineNum"> 16 </span> : : // Under Section 7 of GPL version 3, you are granted additional</a>
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<a name="17"><span class="lineNum"> 17 </span> : : // permissions described in the GCC Runtime Library Exception, version</a>
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<a name="18"><span class="lineNum"> 18 </span> : : // 3.1, as published by the Free Software Foundation.</a>
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<a name="19"><span class="lineNum"> 19 </span> : : </a>
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<a name="20"><span class="lineNum"> 20 </span> : : // You should have received a copy of the GNU General Public License and</a>
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<a name="21"><span class="lineNum"> 21 </span> : : // a copy of the GCC Runtime Library Exception along with this program;</a>
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<a name="22"><span class="lineNum"> 22 </span> : : // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</a>
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<a name="23"><span class="lineNum"> 23 </span> : : // <http://www.gnu.org/licenses/>.</a>
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<a name="24"><span class="lineNum"> 24 </span> : : </a>
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<a name="25"><span class="lineNum"> 25 </span> : : /** @file ext/aligned_buffer.h</a>
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<a name="26"><span class="lineNum"> 26 </span> : : * This file is a GNU extension to the Standard C++ Library.</a>
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<a name="27"><span class="lineNum"> 27 </span> : : */</a>
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<a name="28"><span class="lineNum"> 28 </span> : : </a>
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<a name="29"><span class="lineNum"> 29 </span> : : #ifndef _ALIGNED_BUFFER_H</a>
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<a name="30"><span class="lineNum"> 30 </span> : : #define _ALIGNED_BUFFER_H 1</a>
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<a name="31"><span class="lineNum"> 31 </span> : : </a>
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<a name="32"><span class="lineNum"> 32 </span> : : #pragma GCC system_header</a>
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<a name="33"><span class="lineNum"> 33 </span> : : </a>
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<a name="34"><span class="lineNum"> 34 </span> : : #if __cplusplus >= 201103L</a>
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<a name="35"><span class="lineNum"> 35 </span> : : # include <type_traits></a>
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<a name="36"><span class="lineNum"> 36 </span> : : #else</a>
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<a name="37"><span class="lineNum"> 37 </span> : : # include <bits/c++0x_warning.h></a>
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<a name="38"><span class="lineNum"> 38 </span> : : #endif</a>
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<a name="39"><span class="lineNum"> 39 </span> : : </a>
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<a name="40"><span class="lineNum"> 40 </span> : : namespace __gnu_cxx</a>
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<a name="41"><span class="lineNum"> 41 </span> : : {</a>
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<a name="42"><span class="lineNum"> 42 </span> : : // A utility type containing a POD object that can hold an object of type</a>
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<a name="43"><span class="lineNum"> 43 </span> : : // _Tp initialized via placement new or allocator_traits::construct.</a>
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<a name="44"><span class="lineNum"> 44 </span> : : // Intended for use as a data member subobject, use __aligned_buffer for</a>
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<a name="45"><span class="lineNum"> 45 </span> : : // complete objects.</a>
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<a name="46"><span class="lineNum"> 46 </span> : : template<typename _Tp></a>
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<a name="47"><span class="lineNum"> 47 </span> : : struct __aligned_membuf</a>
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<a name="48"><span class="lineNum"> 48 </span> : : {</a>
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<a name="49"><span class="lineNum"> 49 </span> : : // Target macro ADJUST_FIELD_ALIGN can produce different alignment for</a>
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<a name="50"><span class="lineNum"> 50 </span> : : // types when used as class members. __aligned_membuf is intended</a>
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<a name="51"><span class="lineNum"> 51 </span> : : // for use as a class member, so align the buffer as for a class member.</a>
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<a name="52"><span class="lineNum"> 52 </span> : : // Since GCC 8 we could just use alignof(_Tp) instead, but older</a>
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<a name="53"><span class="lineNum"> 53 </span> : : // versions of non-GNU compilers might still need this trick.</a>
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<a name="54"><span class="lineNum"> 54 </span> : : struct _Tp2 { _Tp _M_t; };</a>
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<a name="55"><span class="lineNum"> 55 </span> : : </a>
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<a name="56"><span class="lineNum"> 56 </span> : : alignas(__alignof__(_Tp2::_M_t)) unsigned char _M_storage[sizeof(_Tp)];</a>
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<a name="57"><span class="lineNum"> 57 </span> : : </a>
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<a name="58"><span class="lineNum"> 58 </span> : : __aligned_membuf() = default;</a>
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<a name="59"><span class="lineNum"> 59 </span> : : </a>
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<a name="60"><span class="lineNum"> 60 </span> : : // Can be used to avoid value-initialization zeroing _M_storage.</a>
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<a name="61"><span class="lineNum"> 61 </span> : : __aligned_membuf(std::nullptr_t) { }</a>
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<a name="62"><span class="lineNum"> 62 </span> : : </a>
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<a name="63"><span class="lineNum"> 63 </span> : : void*</a>
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<a name="64"><span class="lineNum"> 64 </span> :<span class="lineCov"> 233 : _M_addr() noexcept</span></a>
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<a name="65"><span class="lineNum"> 65 </span> :<span class="lineCov"> 233 : { return static_cast<void*>(&_M_storage); }</span></a>
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<a name="66"><span class="lineNum"> 66 </span> : : </a>
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<a name="67"><span class="lineNum"> 67 </span> : : const void*</a>
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<a name="68"><span class="lineNum"> 68 </span> :<span class="lineCov"> 45 : _M_addr() const noexcept</span></a>
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<a name="69"><span class="lineNum"> 69 </span> :<span class="lineCov"> 45 : { return static_cast<const void*>(&_M_storage); }</span></a>
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<a name="70"><span class="lineNum"> 70 </span> : : </a>
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<a name="71"><span class="lineNum"> 71 </span> : : _Tp*</a>
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<a name="72"><span class="lineNum"> 72 </span> :<span class="lineCov"> 233 : _M_ptr() noexcept</span></a>
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<a name="73"><span class="lineNum"> 73 </span> :<span class="lineCov"> 233 : { return static_cast<_Tp*>(_M_addr()); }</span></a>
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<a name="74"><span class="lineNum"> 74 </span> : : </a>
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<a name="75"><span class="lineNum"> 75 </span> : : const _Tp*</a>
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<a name="76"><span class="lineNum"> 76 </span> :<span class="lineCov"> 45 : _M_ptr() const noexcept</span></a>
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<a name="77"><span class="lineNum"> 77 </span> :<span class="lineCov"> 45 : { return static_cast<const _Tp*>(_M_addr()); }</span></a>
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<a name="78"><span class="lineNum"> 78 </span> : : };</a>
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<a name="79"><span class="lineNum"> 79 </span> : : </a>
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<a name="80"><span class="lineNum"> 80 </span> : : #if _GLIBCXX_INLINE_VERSION</a>
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<a name="81"><span class="lineNum"> 81 </span> : : template<typename _Tp></a>
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<a name="82"><span class="lineNum"> 82 </span> : : using __aligned_buffer = __aligned_membuf<_Tp>;</a>
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<a name="83"><span class="lineNum"> 83 </span> : : #else</a>
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<a name="84"><span class="lineNum"> 84 </span> : : // Similar to __aligned_membuf but aligned for complete objects, not members.</a>
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<a name="85"><span class="lineNum"> 85 </span> : : // This type is used in <forward_list>, <future>, <bits/shared_ptr_base.h></a>
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<a name="86"><span class="lineNum"> 86 </span> : : // and <bits/hashtable_policy.h>, but ideally they would use __aligned_membuf</a>
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<a name="87"><span class="lineNum"> 87 </span> : : // instead, as it has smaller size for some types on some targets.</a>
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<a name="88"><span class="lineNum"> 88 </span> : : // This type is still used to avoid an ABI change.</a>
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<a name="89"><span class="lineNum"> 89 </span> : : template<typename _Tp></a>
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<a name="90"><span class="lineNum"> 90 </span> : : struct __aligned_buffer</a>
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<a name="91"><span class="lineNum"> 91 </span> : : : std::aligned_storage<sizeof(_Tp), __alignof__(_Tp)></a>
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<a name="92"><span class="lineNum"> 92 </span> : : {</a>
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<a name="93"><span class="lineNum"> 93 </span> : : typename</a>
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<a name="94"><span class="lineNum"> 94 </span> : : std::aligned_storage<sizeof(_Tp), __alignof__(_Tp)>::type _M_storage;</a>
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<a name="95"><span class="lineNum"> 95 </span> : : </a>
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<a name="96"><span class="lineNum"> 96 </span> : : __aligned_buffer() = default;</a>
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<a name="97"><span class="lineNum"> 97 </span> : : </a>
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<a name="98"><span class="lineNum"> 98 </span> : : // Can be used to avoid value-initialization</a>
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<a name="99"><span class="lineNum"> 99 </span> : : __aligned_buffer(std::nullptr_t) { }</a>
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<a name="100"><span class="lineNum"> 100 </span> : : </a>
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<a name="101"><span class="lineNum"> 101 </span> : : void*</a>
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<a name="102"><span class="lineNum"> 102 </span> : : _M_addr() noexcept</a>
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<a name="103"><span class="lineNum"> 103 </span> : : {</a>
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<a name="104"><span class="lineNum"> 104 </span> : : return static_cast<void*>(&_M_storage);</a>
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<a name="105"><span class="lineNum"> 105 </span> : : }</a>
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<a name="106"><span class="lineNum"> 106 </span> : : </a>
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<a name="107"><span class="lineNum"> 107 </span> : : const void*</a>
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<a name="108"><span class="lineNum"> 108 </span> : : _M_addr() const noexcept</a>
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<a name="109"><span class="lineNum"> 109 </span> : : {</a>
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<a name="110"><span class="lineNum"> 110 </span> : : return static_cast<const void*>(&_M_storage);</a>
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<a name="111"><span class="lineNum"> 111 </span> : : }</a>
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<a name="112"><span class="lineNum"> 112 </span> : : </a>
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<a name="113"><span class="lineNum"> 113 </span> : : _Tp*</a>
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<a name="114"><span class="lineNum"> 114 </span> : : _M_ptr() noexcept</a>
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<a name="115"><span class="lineNum"> 115 </span> : : { return static_cast<_Tp*>(_M_addr()); }</a>
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<a name="116"><span class="lineNum"> 116 </span> : : </a>
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<a name="117"><span class="lineNum"> 117 </span> : : const _Tp*</a>
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<a name="118"><span class="lineNum"> 118 </span> : : _M_ptr() const noexcept</a>
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<a name="119"><span class="lineNum"> 119 </span> : : { return static_cast<const _Tp*>(_M_addr()); }</a>
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<a name="120"><span class="lineNum"> 120 </span> : : };</a>
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<a name="121"><span class="lineNum"> 121 </span> : : #endif</a>
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<a name="122"><span class="lineNum"> 122 </span> : : </a>
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<a name="123"><span class="lineNum"> 123 </span> : : } // namespace</a>
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<a name="124"><span class="lineNum"> 124 </span> : : </a>
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<a name="125"><span class="lineNum"> 125 </span> : : #endif /* _ALIGNED_BUFFER_H */</a>
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</pre>
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<br>
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<table width="100%" border=0 cellspacing=0 cellpadding=0>
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<tr><td class="ruler"><img src="../../glass.png" width=3 height=3 alt=""></td></tr>
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<tr><td class="versionInfo">Generated by: <a href="http://ltp.sourceforge.net/coverage/lcov.php" target="_parent">LCOV version 1.14</a></td></tr>
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<br>
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