42 lines
2.6 KiB
HTML
42 lines
2.6 KiB
HTML
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<title>std::atomic_ref<T>::required_alignment</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::atomic_ref<T>::</span>required_alignment</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-atomic.html">atomic</a>‎ | <a href="cpp-atomic-atomic_ref.html">atomic ref</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">static</span> <span class="kw4">constexpr</span> <a href="cpp-types-size_t.html"><span class="kw100">std::<span class="me2">size_t</span></span></a> required_alignment<span class="sy1">=</span> <span class="coMULTI">/*implementation-defined*/</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p><code>required_alignment</code> 的值是要被原子引用所引用的对象所需的对齐要求，至少为 <span class="t-c"><span class="mw-geshi cpp source-cpp">alignof<span class="br0">(</span>T<span class="br0">)</span></span></span> 。</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>硬件可能要求要被引用 <code>atomic_ref<T></code> 的对象拥有比其他 <code>T</code> 对象更严格的要求，而 <code>atomic_ref</code> 上的操作是否免锁能依赖于被引用对象的对齐。</p>
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