70 lines
3.8 KiB
HTML
70 lines
3.8 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::align_val_t</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_memory_new_align_val_t skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>align_val_t</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-memory.html">memory</a>‎ | <a href="cpp-memory-new.html">new</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div>定义于头文件 <code><a href="cpp-header-new.html"><new></a></code></div>
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<td></td>
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<tr class="t-dcl t-since-cxx17">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw2">enum</span> <span class="kw1">class</span> align_val_t <span class="sy4">:</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p>在将 <a href="cpp-language-new.html">new 表达式</a>和 <a href="cpp-language-delete.html">delete 表达式</a>用于对齐要求大于 <code>__STDCPP_DEFAULT_NEW_ALIGNMENT__</code> 的对象时，该对齐要求作为 <code>std::align_val_t</code> 类型的参数传递给分配/解分配函数。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>对齐（以 <span class="t-c"><span class="mw-geshi cpp source-cpp">alignof</span></span> 取得者）拥有 <span class="t-lc"><a href="cpp-types-size_t.html">std::size_t</a></span> 类型，但采用 <span class="t-lc"><a href="cpp-types-size_t.html">std::size_t</a></span> 作为附加参数的布置形式分配和删除函数已经被使用了，故使用此类型以代替。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-new-operator_new.html"><span class="t-lines"><span>operator new</span><span>operator new[]</span></span></a></div>
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</div>
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</td>
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<td>分配函数<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-memory-new-operator_delete.html"><span class="t-lines"><span>operator delete</span><span>operator delete[]</span></span></a></div>
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</div>
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</td>
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<td>解分配函数<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</body>
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