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<title>std::basic_ios&lt;CharT,Traits&gt;::tie</title>
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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>tie</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_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy2">*</span> tie<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_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy2">*</span> tie<span class="br0">(</span> <a href="cpp-io-basic_ostream.html"><span class="kw1715">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT,Traits<span class="sy1">&gt;</span><span class="sy2">*</span> str <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#31649;&#29702;&#32852;&#31995;&#27969;&#12290;&#32852;&#31995;&#27969;&#26159;&#36755;&#20986;&#27969;&#65292;&#23427;&#19982;&#27969;&#32531;&#20914;&#65288; <span class="t-lc"><a href="cpp-io-basic_ios-rdbuf.html">rdbuf()</a></span> &#65289;&#25152;&#25511;&#21046;&#30340;&#36755;&#20986;&#24207;&#21015;&#21516;&#27493;&#65292;&#21363;&#22312;&#20219;&#20309; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#19978;&#30340;&#36755;&#20837;/&#36755;&#20986;&#25805;&#20316;&#21069;&#65292;&#22312;&#32852;&#31995;&#27969;&#19978;&#35843;&#29992; <span class="t-c"><span class="mw-geshi cpp source-cpp">flush<span class="br0">(</span><span class="br0">)</span></span></span> &#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#36820;&#22238;&#24403;&#21069;&#32852;&#31995;&#27969;&#12290;&#33509;&#26080;&#32852;&#31995;&#27969;&#65292;&#21017;&#36820;&#22238;&#31354;&#25351;&#38024;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#35774;&#32622;&#24403;&#21069;&#32852;&#31995;&#27969;&#20026; <code>str</code> &#12290;&#36820;&#22238;&#25805;&#20316;&#21069;&#30340;&#32852;&#31995;&#27969;&#12290;&#33509;&#26080;&#32852;&#31995;&#27969;&#65292;&#21017;&#36820;&#22238;&#31354;&#25351;&#38024;&#12290;</div>
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<p>&#40664;&#35748;&#24773;&#20917;&#19979;&#65292;&#32852;&#31995;&#26631;&#20934;&#27969; <code>cin</code> &#21644; <code>cerr</code> &#21040; <code>cout</code> &#12290;&#31867;&#20284;&#22320;&#65292;&#32852;&#31995;&#20854;&#23485;&#23545;&#24212;&#29256;&#26412; <code>wcin</code> &#21644; <code>wcerr</code> &#21040; <code>wcout</code> &#12290;</p>
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<pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;fstream&gt;</span>
<span class="co2">#include &lt;string&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_ofstream.html"><span class="kw1733">std::<span class="me2">ofstream</span></span></a> os<span class="br0">(</span><span class="st0">&quot;test.txt&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-io-basic_ifstream.html"><span class="kw1732">std::<span class="me2">ifstream</span></span></a> is<span class="br0">(</span><span class="st0">&quot;test.txt&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> value<span class="br0">(</span><span class="st0">&quot;0&quot;</span><span class="br0">)</span><span class="sy4">;</span>
os <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;Hello&quot;</span><span class="sy4">;</span>
is <span class="sy1">&gt;&gt;</span> value<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;Result before tie(): <span class="es1">\&quot;</span>&quot;</span> <span class="sy1">&lt;&lt;</span> value <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\&quot;</span><span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
is.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
is.<span class="me1">tie</span><span class="br0">(</span><span class="sy3">&amp;</span>os<span class="br0">)</span><span class="sy4">;</span>
is <span class="sy1">&gt;&gt;</span> value<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;Result after tie(): <span class="es1">\&quot;</span>&quot;</span> <span class="sy1">&lt;&lt;</span> value <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;<span class="es1">\&quot;</span><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">Result before tie(): &quot;0&quot;
Result after tie(): &quot;Hello&quot;</pre></div>
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