99 lines
6.4 KiB
HTML
99 lines
6.4 KiB
HTML
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<title>std::basic_syncbuf<CharT,Traits,Allocator>::operator=</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_syncbuf_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::basic_syncbuf<CharT,Traits,Allocator>::</span>operator=</h1>
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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_syncbuf.html">basic syncbuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_syncbuf<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span>basic_syncbuf<span class="sy3">&&</span> other<span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>首先，调用 <a href="cpp-io-basic_syncbuf-emit.html"><tt>emit()</tt></a> 传输所有待决输出（和延迟冲入，若存在）到被包装流。</p>
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<p>然后通过从<code>other</code> 移动所有内容，包括临时存储、被包装的流指针、策略及所有其他状态（如互斥指针），进行移动赋值。移动后， <code>other</code> 不与流关联，而 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get_wrapped</span><span class="br0">(</span><span class="br0">)</span><span class="sy1">==</span>nullptr</span></span> 。 <code>other</code> 的 <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> 基类的放置区成员指针保证为空。销毁被移动的 <code>other</code> 将不会产生任何输出。</p>
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<p>若 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-memory-allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1"><</span>Allocator<span class="sy1">></span><span class="sy4">::</span><span class="me2">propagate_on_container_move_assignment</span><span class="sy4">::</span><span class="me2">value</span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> ，则不更改分配器。否则，移动后 <span class="t-c"><span class="mw-geshi cpp source-cpp">get_allocator<span class="br0">(</span><span class="br0">)</span></span></span> 等于 <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get_allocator</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</p>
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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>other</td>
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<td>-</td>
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<td>要移动的另一 std::basic_syncbuf</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><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></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-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><a href="cpp-io-basic_osyncstream-operator=.html"><span class="t-lines"><span>operator=</span></span></a></div>
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<td>赋值 basic_osyncstream<br />
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<span class="t-mark">(<code>std::basic_osyncstream<CharT,Traits,Allocator></code> 的公开成员函数)</span></td>
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<div><a href="cpp-io-basic_syncbuf-basic_syncbuf.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造 basic_syncbuf 对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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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-io-basic_syncbuf-emit.html"><span class="t-lines"><span>emit</span></span></a></div>
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</div>
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</td>
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<td>原子地传输整个内部缓冲区给被包装 streambuf<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_syncbuf-swap.html"><span class="t-lines"><span>swap</span></span></a></div>
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</div>
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</td>
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<td>交换二个 basic_syncbuf 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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</table>
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