117 lines
8.0 KiB
HTML
117 lines
8.0 KiB
HTML
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<title>std::basic_syncbuf<CharT,Traits,Allocator>::basic_syncbuf</title>
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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>basic_syncbuf</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="br0">(</span><span class="br0">)</span><br />
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<span class="sy4">:</span> basic_syncbuf<span class="br0">(</span>nullptr<span class="br0">)</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_syncbuf<span class="br0">(</span> streambuf_type<span class="sy2">*</span> obuf <span class="br0">)</span><br />
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<span class="sy4">:</span> basic_syncbuf<span class="br0">(</span> obuf, Allocator<span class="br0">(</span><span class="br0">)</span> <span class="br0">)</span> <span class="br0">{</span><span class="br0">}</span></span></div>
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<td>(2)</td>
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<div><span class="mw-geshi cpp source-cpp">basic_syncbuf<span class="br0">(</span> streambuf_type<span class="sy2">*</span> obuf, <span class="kw4">const</span> Allocator<span class="sy3">&</span> a<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(3)</td>
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<div><span class="mw-geshi cpp source-cpp">basic_syncbuf<span class="br0">(</span> basic_syncbuf<span class="sy3">&&</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(4)</td>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数：创建 <code>std::basic_syncbuf</code> 的实例，将其同步时发生（ emit-on-sync ）策略设为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> ，被包装流缓冲设为 <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> ，并以默认构造的 <code>Allocator</code> 为临时存储的分配器。</div>
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<div class="t-li1"><span class="t-li">2,3)</span> 创建 <code>std::basic_syncbuf</code> 的实例，将其同步时发生（ emit-on-sync ）策略设为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> ，被包装流缓冲设为 <code>obuf</code> ，并以 <code>a</code> 为临时存储的分配器。</div>
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<div class="t-li1"><span class="t-li">3)</span> 移动构造函数：通过从另一 <code>std::basic_syncbuf</code> 对象 <code>rhs</code> 移动所有内容，包括临时存储、被包装流指针、策略及所有其他状态（例如互斥指针），移动构造 <code>std::basic_syncbuf</code> 对象。移动后， <code>rhs</code> 不与流关联，而 <span class="t-c"><span class="mw-geshi cpp source-cpp">rhs.<span class="me1">get_wrapped</span><span class="br0">(</span><span class="br0">)</span><span class="sy1">==</span>nullptr</span></span> 。 <code>rhs</code> 的基类 <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> 的放置区指针保证为空。销毁被移动的 <code>rhs</code> 将不产生任何输出。</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>obuf</td>
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<td>-</td>
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<td>指向要包装的 <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> 的指针</td>
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<td>a</td>
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<td>-</td>
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<td>用于临时存储的分配器</td>
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<td>rhs</td>
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<td>-</td>
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<td>作为移动来源的另一 std::basic_syncbuf</td>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<div class="t-li1"><span class="t-li">2,3)</span> 可能从内部临时存储的构造函数抛出 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> ，或从互斥的构造抛出 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span> 。</div>
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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>通常为 <span class="t-lc">std::basic_osyncstream</span> 的适当构造函数所调用。</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_streambuf-pubsync.html"><span class="t-lines"><span>sync</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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<td>将缓冲与关联的字符序列同步<br />
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<span class="t-mark">(<code>std::basic_streambuf<CharT,Traits></code> 的虚受保护成员函数)</span></td>
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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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<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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