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<title>std::basic_ostream&lt;CharT,Traits&gt;::flush</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_ostream&lt;CharT,Traits&gt;::</span>flush</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-io.html">io</a>&lrm; | <a href="cpp-io-basic_ostream.html">basic ostream</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_ostream<span class="sy3">&amp;</span> flush<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#20889;&#20837;&#26410;&#25552;&#20132;&#26356;&#25913;&#21040;&#24213;&#23618;&#36755;&#20986;&#24207;&#21015;&#12290;</p>
<p>&#33509; rdbuf() &#20026;&#31354;&#25351;&#38024;&#65292;&#21017;&#19981;&#20570;&#20219;&#20309;&#20107;&#12290;</p>
<p>&#21542;&#21017;&#65292;&#34920;&#29616;&#20026;<a href="cpp-named_req-UnformattedOutputFunction.html"><span style="font-style:italic">&#26080;&#26684;&#24335;&#36755;&#20986;&#20989;&#25968;</span> <span style="font-family: Georgia, &#39;DejaVu Serif&#39;, serif; font-style:italic">(UnformattedOutputFunction)</span></a> <span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span>&#12290;&#26500;&#36896;&#24182;&#26816;&#26597; sentry &#23545;&#35937;&#21518;&#65292;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">rdbuf<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">&gt;</span>pubsync<span class="br0">(</span><span class="br0">)</span></span></span> &#12290;&#33509;&#35813;&#35843;&#29992;&#36820;&#22238; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">-</span><span class="nu0">1</span></span></span> &#65292;&#21017;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">setstate<span class="br0">(</span>badbit<span class="br0">)</span></span></span> &#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span></p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#33509; <span class="t-c"><span class="mw-geshi cpp source-cpp">exceptions<span class="br0">(</span><span class="br0">)</span><span class="sy3">&amp;</span>badbit<span class="sy3">!</span><span class="sy1">=</span><span class="nu0">0</span></span></span> &#21017;&#21487;&#33021;&#25243;&#20986; <span class="t-lc"><a href="cpp-io-ios_base-failure.html">std::ios_base::failure</a></span> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;thread&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;chrono&gt;</span>
<span class="kw4">void</span> f<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Output from thread...&quot;</span><span class="sy4">;</span>
<a href="cpp-thread-sleep_for.html"><span class="kw2149">std::<span class="me2">this_thread</span><span class="sy4">::</span><span class="me2">sleep_for</span></span></a><span class="br0">(</span><a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="br0">(</span><span class="nu0">2</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;...thread calls flush()<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">flush</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-thread-thread.html"><span class="kw2146">std::<span class="me2">thread</span></span></a> t1<span class="br0">(</span>f<span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-thread-sleep_for.html"><span class="kw2149">std::<span class="me2">this_thread</span><span class="sy4">::</span><span class="me2">sleep_for</span></span></a><span class="br0">(</span><a href="cpp-chrono-duration.html"><span class="kw997">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">seconds</span></span></a><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-clog.html"><span class="kw1762">std::<span class="me2">clog</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Output from main<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
t1.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">Output from main
Output from thread.....thread calls flush()</pre></div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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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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<td>&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">sync<span class="br0">(</span><span class="br0">)</span></span></span><br />
<span class="t-mark">(<code>std::basic_streambuf&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-io-basic_streambuf-pubsync.html"><span class="t-lines"><span>sync</span></span></a></div>
<div><span class="t-lines"><span><span class="t-cmark">[&#34394;]</span></span></span></div>
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<td>&#23558;&#32531;&#20914;&#19982;&#20851;&#32852;&#30340;&#23383;&#31526;&#24207;&#21015;&#21516;&#27493;<br />
<span class="t-mark">(<code>std::basic_streambuf&lt;CharT,Traits&gt;</code> &#30340;&#34394;&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-io-manip-flush.html"><span class="t-lines"><span>flush</span></span></a></div>
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<td>&#20914;&#27927;&#36755;&#20986;&#27969;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-io-manip-endl.html"><span class="t-lines"><span>endl</span></span></a></div>
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<td>&#36755;&#20986; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="st0">&#39;<span class="es1">\n</span>&#39;</span></span></span> &#24182;&#20914;&#27927;&#36755;&#20986;&#27969;<br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<div><a href="cpp-io-basic_istream-sync.html"><span class="t-lines"><span>sync</span></span></a></div>
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<td>&#19982;&#24213;&#23618;&#23384;&#20648;&#35774;&#22791;&#21516;&#27493;<br />
<span class="t-mark">(<code>std::basic_istream&lt;CharT,Traits&gt;</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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