102 lines
5.8 KiB
HTML
102 lines
5.8 KiB
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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<title>std::atomic<T>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_atomic_atomic_operator skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::atomic<T>::</span>operator=</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.html">atomic</a></span></div>
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<td rowspan="142">(1)</td>
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<td rowspan="142"><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">T operator<span class="sy1">=</span><span class="br0">(</span> T desired <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">T operator<span class="sy1">=</span><span class="br0">(</span> T desired <span class="br0">)</span> <span class="kw4">volatile</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td rowspan="142">(2)</td>
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<td rowspan="142"><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">atomic<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> atomic<span class="sy3">&</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp">atomic<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> atomic<span class="sy3">&</span> <span class="br0">)</span> <span class="kw4">volatile</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<div class="t-li1"><span class="t-li">1)</span> 原子地赋 <code>desired</code> 给值原子变量。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">store<span class="br0">(</span>desired<span class="br0">)</span></span></span> 。<span class="t-rev-inl t-since-cxx20"><span>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-atomic-atomic.html"><span class="kw2066">std::<span class="me2">atomic</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="sy4">::</span><span class="me2">is_always_lock_free</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 则 volatile 限定版本被弃用。</span> <span><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> 原子变量非<a href="cpp-named_req-CopyAssignable.html"><span style="font-style:italic">可复制赋值</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span></a> 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>desired</td>
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<td>-</td>
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<td>要赋值的值</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p><code>desired</code> 。</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>不同于大多数赋值运算符，原子类型的赋值运算符不返回到其左侧参数的引用。它们会返回存储值的副本。</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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<div><a href="cpp-atomic-atomic-atomic.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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<td>构造原子对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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