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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>istreambuf_iterator</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-iterator.html">iterator</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-iterator.html">&lt;iterator&gt;</a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="cpp-string-char_traits.html"><span class="kw1266">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span> <span class="sy1">&gt;</span><br /></span>
<p><span class="kw1">class</span> istreambuf_iterator <span class="sy4">:</span> <span class="kw1">public</span> <a href="cpp-iterator-iterator.html"><span class="kw657">std::<span class="me2">iterator</span></span></a><span class="sy1">&lt;</span> <a href="cpp-iterator-iterator_tags.html"><span class="kw652">std::<span class="me2">input_iterator_tag</span></span></a>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; CharT,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw1">typename</span> Traits<span class="sy4">::</span><span class="me2">off_type</span>,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="coMULTI">/* unspecified, usually CharT* */</span>,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; CharT <span class="sy1">&gt;</span></div>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> CharT, <span class="kw1">class</span> Traits <span class="sy1">=</span> <a href="cpp-string-char_traits.html"><span class="kw1266">std::<span class="me2">char_traits</span></span></a><span class="sy1">&lt;</span>CharT<span class="sy1">&gt;</span> <span class="sy1">&gt;</span><br />
<span class="kw1">class</span> istreambuf_iterator<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 &#36215;)</span></td>
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<p><code>std::istreambuf_iterator</code> &#26159;&#21333;&#36255;&#36845;&#20195;&#22120;&#65292;&#20174;&#20026;&#20043;&#26500;&#36896;&#36845;&#20195;&#22120;&#30340; <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> &#23545;&#35937;&#35835;&#21462;&#30456;&#32487;&#23383;&#31526;&#12290;</p>
<p>&#40664;&#35748;&#26500;&#36896;&#30340; <code>std::istreambuf_iterator</code> &#36845;&#20195;&#22120;&#34987;&#31216;&#20026;<i>&#27969;&#23614;</i>&#36845;&#20195;&#22120;&#12290;&#21512;&#27861;&#30340; <code>std::istreambuf_iterator</code> &#25269;&#36798;&#24213;&#23618;&#27969;&#32467;&#23614;&#26102;&#65292;&#23427;&#21464;&#24471;&#31561;&#20110;&#27969;&#23614;&#36845;&#20195;&#22120;&#12290;&#35299;&#24341;&#29992;&#25110;&#36827;&#19968;&#27493;&#33258;&#22686;&#23427;&#23548;&#33268;&#26410;&#23450;&#20041;&#34892;&#20026;&#12290;</p>
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<p><code>std::istreambuf_iterator</code> &#25317;&#26377;&#24179;&#20961;&#22797;&#21046;&#26500;&#36896;&#20989;&#25968;&#12289; constexpr &#40664;&#35748;&#26500;&#36896;&#20989;&#25968;&#21644;&#24179;&#20961;&#26512;&#26500;&#20989;&#25968;&#12290;</p>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">&#25104;&#21592;&#31867;&#22411;</span></h3>
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<td>&#25104;&#21592;&#31867;&#22411;</td>
<td>&#23450;&#20041;</td>
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<td><code>iterator_category</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-iterator_tags.html"><span class="kw652">std::<span class="me2">input_iterator_tag</span></span></a></span></span></td>
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<td><code>value_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">CharT</span></span></td>
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<td><code>difference_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">Traits<span class="sy4">::</span><span class="me2">off_type</span></span></span></td>
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<td><code>pointer</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/* unspecified, usually CharT* */</span></span></span></td>
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<td><code>reference</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp">CharT</span></span></td>
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<td><code>char_type</code></td>
<td><code>CharT</code></td>
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<td><code>traits_type</code></td>
<td><code>Traits</code></td>
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<td><code>int_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">typename</span> traits<span class="sy4">::</span><span class="me2">int_type</span></span></span></td>
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<td><code>streambuf_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_streambuf.html"><span class="kw1665">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span></span></span></td>
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<td><code>istream_type</code></td>
<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-basic_istream.html"><span class="kw1712">std::<span class="me2">basic_istream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span></span></span></td>
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<td><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/* proxy */</span></span></td>
<td>&#23454;&#29616;&#23450;&#20041;&#30340;&#31867;&#31867;&#22411;&#12290;&#21517;&#31216; <code><i>proxy</i></code> &#20165;&#20026;&#35828;&#26126;&#12290;<br />
<code><i>proxy</i></code> &#23545;&#35937;&#20445;&#26377;&#19968;&#20010; <code>char_type</code> &#23383;&#31526;&#21644;&#19968;&#20010; <code>streambuf_type*</code> &#25351;&#38024;&#12290;<br />
&#20197; <code>operator*</code> &#35299;&#24341;&#29992; <code><i>proxy</i></code> &#23545;&#35937;&#24471;&#21040;&#23384;&#20648;&#30340;&#23383;&#31526;&#12290;</td>
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<p>&#35201;&#27714;&#36890;&#36807;&#20174; <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-iterator-iterator.html"><span class="kw657">std::<span class="me2">iterator</span></span></a><span class="sy1">&lt;</span><a href="cpp-iterator-iterator_tags.html"><span class="kw652">std::<span class="me2">input_iterator_tag</span></span></a>, CharT, Traits<span class="sy4">::</span><span class="me2">off_type</span>, <span class="coMULTI">/* unspecified, usually CharT* */</span>, CharT<span class="sy1">&gt;</span></span></span> &#32487;&#25215;&#33719;&#24471;&#25104;&#21592;&#31867;&#22411; <code>iterator_category</code>&#12289; <code>value_type</code>&#12289; <code>difference_type</code>&#12289; <code>pointer</code> &#21450; <code>reference</code> &#12290;</p>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><a href="cpp-iterator-istreambuf_iterator-istreambuf_iterator.html"><span class="t-lines"><span>(&#26500;&#36896;&#20989;&#25968;)</span></span></a></div>
</div>
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<td>&#26500;&#36896;&#26032;&#30340; <code>istreambuf_iterator</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
<div><span class="t-lines"><span>(&#26512;&#26500;&#20989;&#25968;)</span></span></div>
<div><span class="t-lines"><span><span class="t-mark">(&#38544;&#24335;&#22768;&#26126;)</span></span></span></div>
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<td>&#26512;&#26500; <code>istreambuf_iterator</code><br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-iterator-istreambuf_iterator-operator*.html"><span class="t-lines"><span>operator*</span><span>operator-&gt;</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-cxx11">(C++11 &#36215;)</span><span class="t-mark-rev t-until-cxx17">(C++17 &#21069;)</span></span></span></div>
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<td>&#33719;&#24471;&#24403;&#21069;&#23383;&#31526;&#30340;&#21103;&#26412;<br />
&#33509; <code>CharT</code> &#25317;&#26377;&#25104;&#21592;&#65292;&#21017;&#35775;&#38382;&#24403;&#21069;&#23383;&#31526;&#30340;&#25104;&#21592;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-iterator-istreambuf_iterator-operator_arith.html"><span class="t-lines"><span>operator++</span><span>operator++<span class="t-dsc-small">(int)</span></span></span></a></div>
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<td>&#25512;&#36827;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div class="t-dsc-member-div">
<div><a href="cpp-iterator-istreambuf_iterator-equal.html"><span class="t-lines"><span>equal</span></span></a></div>
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<td>&#27979;&#35797;&#20004;&#20010; <code>istreambuf_iterator</code> &#26159;&#21542;&#22343;&#20026;&#27969;&#23614;&#25110;&#22343;&#21512;&#27861;<br />
<span class="t-mark">(&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<h3><span class="mw-headline" id=".E9.9D.9E.E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">&#38750;&#25104;&#21592;&#20989;&#25968;</span></h3>
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<div><a href="cpp-iterator-istreambuf_iterator-operator_cmp.html"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 &#20013;&#31227;&#38500;)</span></span></span></div>
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<td>&#27604;&#36739;&#20004;&#20010; <code>istreambuf_iterator</code><br />
<span class="t-mark">(&#20989;&#25968;&#27169;&#26495;)</span></td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="cpp source-cpp">
<pre class="de1"><span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;sstream&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;iterator&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="co1">// &#20856;&#22411;&#20351;&#29992;&#24773;&#20917;&#65306;&#20197;&#19968;&#23545;&#36845;&#20195;&#22120;&#34920;&#31034;&#30340;&#36755;&#20837;&#27969;</span>
<a href="cpp-io-basic_istringstream.html"><span class="kw1734">std::<span class="me2">istringstream</span></span></a> in<span class="br0">{</span><span class="st0">&quot;Hello, world&quot;</span><span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">istreambuf_iterator</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> it<span class="br0">{</span>in<span class="br0">}</span>, end<span class="sy4">;</span>
<a href="cpp-string-basic_string.html"><span class="kw1229">std::<span class="me2">string</span></span></a> ss<span class="br0">{</span>it, end<span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;ss has &quot;</span> <span class="sy1">&lt;&lt;</span> ss.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot; bytes; &quot;</span>
<span class="st0">&quot;it holds <span class="es1">\&quot;</span>&quot;</span> <span class="sy1">&lt;&lt;</span> ss <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="co1">// &#28436;&#31034;&#21333;&#36255;&#26412;&#24615;</span>
<a href="cpp-io-basic_istringstream.html"><span class="kw1734">std::<span class="me2">istringstream</span></span></a> s<span class="br0">{</span><span class="st0">&quot;abc&quot;</span><span class="br0">}</span><span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">istreambuf_iterator</span><span class="sy1">&lt;</span><span class="kw4">char</span><span class="sy1">&gt;</span> i1<span class="br0">{</span>s<span class="br0">}</span>, i2<span class="br0">{</span>s<span class="br0">}</span><span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;i1 returns &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>i1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</span>
<span class="st0">&quot;i2 returns &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>i2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="sy2">++</span>i1<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;after incrementing i1, but not i2<span class="es1">\n</span>&quot;</span>
<span class="st0">&quot;i1 returns &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>i1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</span>
<span class="st0">&quot;i2 returns &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>i2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</span><span class="sy4">;</span>
<span class="sy2">++</span>i2<span class="sy4">;</span>
<a href="cpp-io-cout.html"><span class="kw1757">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;after incrementing i2, but not i1<span class="es1">\n</span>&quot;</span>
<span class="st0">&quot;i1 returns &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>i1 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<span class="es1">\n</span>&quot;</span>
<span class="st0">&quot;i2 returns &#39;&quot;</span> <span class="sy1">&lt;&lt;</span> <span class="sy2">*</span>i2 <span class="sy1">&lt;&lt;</span> <span class="st0">&quot;&#39;<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>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">ss has 12 bytes; it holds &quot;Hello, world&quot;
i1 returns &#39;a&#39;
i2 returns &#39;a&#39;
after incrementing i1, but not i2
i1 returns &#39;b&#39;
i2 returns &#39;b&#39;
after incrementing i2, but not i1
i1 returns &#39;c&#39;
i2 returns &#39;c&#39;</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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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-ostreambuf_iterator.html"><span class="t-lines"><span>ostreambuf_iterator</span></span></a></div>
</div>
</td>
<td>&#20889;&#20837; <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> &#30340;&#36755;&#20986;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="cpp-iterator-istream_iterator.html"><span class="t-lines"><span>istream_iterator</span></span></a></div>
</div>
</td>
<td>&#20174; <span class="t-lc"><a href="cpp-io-basic_istream.html">std::basic_istream</a></span> &#35835;&#21462;&#30340;&#36755;&#20837;&#36845;&#20195;&#22120;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<div class="visualClear"></div>
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