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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_ios&lt;CharT,Traits&gt;::</span>rdbuf</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_ios.html">basic ios</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_streambuf.html"><span class="kw1666">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy2">*</span> rdbuf<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<div><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_streambuf.html"><span class="kw1666">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy2">*</span> rdbuf<span class="br0">(</span> <a href="cpp-io-basic_streambuf.html"><span class="kw1666">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy2">*</span> sb <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#31649;&#29702;&#20851;&#32852;&#30340;&#27969;&#32531;&#20914;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238;&#20851;&#32852;&#30340;&#27969;&#32531;&#20914;&#12290;&#33509;&#26080;&#20851;&#32852;&#27969;&#32531;&#20914;&#65292;&#21017;&#36820;&#22238;&#31354;&#25351;&#38024;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#35774;&#32622;&#20851;&#32852;&#27969;&#32531;&#20914;&#20026; <code>sb</code> &#12290;&#36890;&#36807;&#35843;&#29992; <span class="t-lc"><a href="cpp-io-basic_ios-clear.html">clear()</a></span> &#28165;&#38500;&#38169;&#35823;&#29366;&#24577;&#12290;&#36820;&#22238;&#25805;&#20316;&#21069;&#30340;&#20851;&#32852;&#27969;&#32531;&#20914;&#12290;&#33509;&#26080;&#20851;&#32852;&#27969;&#32531;&#20914;&#65292;&#21017;&#36820;&#22238;&#31354;&#25351;&#38024;&#12290;</div>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>sb</td>
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<td>&#35201;&#20851;&#32852;&#30340;&#27969;&#32531;&#20914;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#20851;&#32852;&#30340;&#27969;&#32531;&#20914;&#65292;&#25110;&#33509;&#26080;&#20851;&#32852;&#27969;&#32531;&#20914;&#21017;&#20026;&#31354;&#25351;&#38024;&#12290;</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">&#24322;&#24120;</span></h3>
<p>&#21487;&#33021;&#25243;&#20986;&#23454;&#29616;&#23450;&#20041;&#30340;&#24322;&#24120;&#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;iostream&gt;</span>
<span class="co2">#include &lt;sstream&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<a href="cpp-io-basic_ostringstream.html"><span class="kw1736">std::<span class="me2">ostringstream</span></span></a> local<span class="sy4">;</span>
<span class="kw4">auto</span> cout_buff <span class="sy1">=</span> <a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#20445;&#23384;&#25351;&#21521; std::cout &#32531;&#20914;&#30340;&#25351;&#38024;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">rdbuf</span><span class="br0">(</span>local.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// &#20197; &#39;local&#39; &#23545;&#35937;&#30340;&#32531;&#20914;</span>
<span class="co1">// &#26367;&#25442;&#20869;&#37096;&#30340; std::cout &#32531;&#20914;</span>
<span class="co1">// &#29616;&#22312; std::cout &#20197; &#39;local&#39; &#32531;&#20914;&#24037;&#20316;</span>
<span class="co1">// &#20320;&#30475;&#19981;&#21040;&#27492;&#28040;&#24687;</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;some message&quot;</span><span class="sy4">;</span>
<span class="co1">// &#22238;&#21040;&#26087;&#32531;&#20914;</span>
<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>.<span class="me1">rdbuf</span><span class="br0">(</span>cout_buff<span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// &#20320;&#23558;&#30475;&#21040;&#27492;&#28040;&#24687;</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;back to default buffer<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="co1">// &#25171;&#21360; &#39;local&#39; &#20869;&#23481;</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;local content: &quot;</span> <span class="sy1">&lt;&lt;</span> local.<span class="me1">str</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\n</span>&quot;</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">back to default buffer
local content: some message</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_ios-set_rdbuf.html"><span class="t-lines"><span>set_rdbuf</span></span></a></div>
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<td>&#26367;&#25442; <code>rdbuf</code> &#32780;&#19981;&#28165;&#38500;&#20854;&#38169;&#35823;&#29366;&#24577;<br />
<span class="t-mark">(&#21463;&#20445;&#25252;&#25104;&#21592;&#20989;&#25968;)</span></td>
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