92 lines
6.8 KiB
HTML
92 lines
6.8 KiB
HTML
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<title>std::basic_syncbuf<CharT,Traits,Allocator>::emit</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_syncbuf_emit 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>emit</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"><span class="kw4">bool</span> emit<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>原子地传输所有待决输出到被包装流。</p>
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<p>所有传输字符到同一被包装流缓冲对象的 <span class="t-c"><span class="mw-geshi cpp source-cpp">emit<span class="br0">(</span><span class="br0">)</span></span></span> 调用以单独全序出现，在该全序中，每个 <span class="t-c"><span class="mw-geshi cpp source-cpp">emit<span class="br0">(</span><span class="br0">)</span></span></span> 调用<a href="cpp-atomic-memory_order.html">同步于</a>后继的 <span class="t-c"><span class="mw-geshi cpp source-cpp">emit<span class="br0">(</span><span class="br0">)</span></span></span> 调用，即使这些调用通过不同的 <span class="t-lc">std::basic_syncbuf</span>/<span class="t-lc">std::basic_osyncstream</span> 实例进行。实践中，这表示 emit() 采用与被包装流对象唯一关联的锁：例如，能在一个静态哈希映射中保有锁，其中将被包装流的地址用作关键。</p>
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<p>若最近对 <span class="t-c"><span class="mw-geshi cpp source-cpp">emit<span class="br0">(</span><span class="br0">)</span></span></span> 的调用导致调用了 <a href="cpp-io-basic_syncbuf-sync.html"><tt>sync</tt></a> ，则它会调用其上的 <a href="cpp-io-basic_streambuf-pubsync.html"><tt>pubsync()</tt></a> 冲入被包装流。</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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<p>（无）</p>
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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>若以下均为真则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ：</p>
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<ul>
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<li>有被包装流（被包装的流缓冲指针非空）</li>
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<li>已成功将所有字符从临时存储发送到被包装流</li>
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<li>若请求调用 <a href="cpp-io-basic_streambuf-pubsync.html"><tt>pubsync()</tt></a> ，则它亦成功完成。</li>
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</ul>
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<p>否则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>通常为占有流缓冲的 <span class="t-lc">std::basic_osyncstream</span> 或 <a href="cpp-io-basic_osyncstream-emit.html"><tt>std::basic_osyncstream::emit</tt></a> 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_osyncstream-~basic_osyncstream.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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<td>销毁 basic_osyncstream 并发射其内部缓冲区<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_osyncstream-emit.html"><span class="t-lines"><span>emit</span></span></a></div>
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<td>调用底层 basic_syncbuf 上的 emit 以传输其内部数据到最终目标<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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<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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