91 lines
5.6 KiB
HTML
91 lines
5.6 KiB
HTML
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<title>std::basic_spanbuf<CharT,Traits>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_spanbuf_operator skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_spanbuf<CharT,Traits>::</span>operator=</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-io.html">io</a>‎ | <a href="cpp-io-basic_spanbuf.html">basic spanbuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_spanbuf<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span> basic_spanbuf<span class="sy3">&&</span> rhs <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">basic_spanbuf<span class="sy3">&</span> operator<span class="br0">(</span> <span class="kw4">const</span> basic_spanbuf<span class="sy3">&</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<div class="t-li1"><span class="t-li">1)</span> 移动赋值运算符。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">auto</span> tmp<span class="br0">{</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>rhs<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span> this<span class="sy2">-</span><span class="sy1">></span>swap<span class="br0">(</span>tmp<span class="br0">)</span><span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*</span>this<span class="sy4">;</span></span></span> 。移动赋值后 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 保有 <code>rhs</code> 在移动赋值前保有的状态。移动赋值后 <code>rhs</code> 是否仍然保有底层缓冲区是实现定义的。</div>
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<div class="t-li1"><span class="t-li">2)</span> 复制赋值运算符被删除； <code>basic_spanbuf</code> 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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<table class="t-par-begin">
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<td>rhs</td>
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<td>-</td>
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<td>将作为移动来源的另一 <code>basic_spanbuf</code></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>*this</code></p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>可能抛出实现定义的异常。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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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 class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-io-basic_spanbuf-basic_spanbuf.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</td>
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<td>构造 <code>basic_spanbuf</code> 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-io-basic_spanbuf-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx23">(C++23)</span></span></span></div>
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</div>
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</td>
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<td>交换二个 <code>basic_spanbuf</code> 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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