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web/cppreference-zh/chmhelp/cpp-io-basic_filebuf-sync.html
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web/cppreference-zh/chmhelp/cpp-io-basic_filebuf-sync.html
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<!DOCTYPE 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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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::basic_filebuf<CharT,Traits>::sync</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_filebuf_sync skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_filebuf<CharT,Traits>::</span>sync</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_filebuf.html">basic filebuf</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<td class="t-dcl-nopad">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">protected</span><span class="sy4">:</span><br />
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<span class="kw1">virtual</span> <span class="kw4">int</span> sync<span class="br0">(</span><span class="br0">)</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td class="t-dcl-nopad"></td>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<p>若放置区存在(例如文件为写入打开),则调用 <span class="t-lc"><a href="cpp-io-basic_streambuf-overflow.html">overflow()</a></span> 写入所有未处理输出到文件,然后如同以调用 <span class="t-lc"><a href="cpp-io-c-fflush.html">std::fflush</a></span> 冲入文件。</p>
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<p>若获取区存在(例如文件为读取打开),则效果是实现定义的。典型实现可能清空获取区,并将当前文件位置后移对应的字节数。</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>成功情况下为 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> ,失败情况下为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1</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>对于输出流, <span class="t-lc"><a href="cpp-io-basic_filebuf-close.html">close()</a></span> 、 <span class="t-lc"><a href="cpp-io-basic_streambuf-pubseekoff.html">seekoff()</a></span> 和 <span class="t-lc"><a href="cpp-io-basic_streambuf-pubseekpos.html">seekpos()</a></span> 隐式调用,而 <span class="t-lc"><a href="cpp-io-basic_streambuf-pubsync.html">std::basic_streambuf::pubsync()</a></span> 显式调用 <code>sync()</code> 或其等价内容。</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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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<tr>
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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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</tr>
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</table>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_streambuf-pubsync.html"><span class="t-lines"><span>pubsync</span></span></a></div>
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</div>
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</td>
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<td>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">sync<span class="br0">(</span><span class="br0">)</span></span></span><br />
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<span class="t-mark">(<code>std::basic_streambuf<CharT,Traits></code> 的公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-c-fflush.html"><span class="t-lines"><span>fflush</span></span></a></div>
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</div>
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</td>
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<td>将输出流与实际文件同步<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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