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<title>std::basic_streambuf<CharT,Traits>::pubsetbuf, std::basic_streambuf<CharT,Traits>::setbuf</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_streambuf<CharT,Traits>::</span>pubsetbuf, <span style="font-size:0.7em; line-height:130%">std::basic_streambuf<CharT,Traits>::</span>setbuf</h1>
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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_streambuf.html">basic streambuf</a></span></div>
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<div><span class="mw-geshi cpp source-cpp">basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> pubsetbuf<span class="br0">(</span> char_type<span class="sy2">*</span> s, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n <span class="br0">)</span></span></div>
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<td>(1)</td>
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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> basic_streambuf<span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> setbuf<span class="br0">(</span> char_type<span class="sy2">*</span> s, <a href="cpp-io-streamsize.html"><span class="kw1804">std::<span class="me2">streamsize</span></span></a> n <span class="br0">)</span></span></div>
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<div class="t-li1"><span class="t-li">1)</span> 调用最终派生类上的 <code>setbuf(s, n)</code></div>
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<div class="t-li1"><span class="t-li">2)</span> 此函数的基类版本无效果。派生类可覆写此函数，以允许移除或替换受控制字符序列（缓冲区）为用户提供的数组，或为任何实现特定的目的。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<td>s</td>
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<td>-</td>
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<td>指向用户提供的缓冲区中首个 CharT 的指针</td>
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<td>n</td>
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<td>-</td>
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<td>用户提供缓冲区中的 CharT 元素数</td>
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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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<div class="t-li1"><span class="t-li">1)</span> <code>setbuf(s, n)</code> 的返回值</div>
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<div class="t-li1"><span class="t-li">2)</span> <span class="t-c"><span class="mw-geshi cpp source-cpp">this</span></span></div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<p>为读取提供 10k 缓冲区。 Linux 上，可用 strace 工具观察实际读取的字节数</p>
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <fstream></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <string></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="kw4">int</span> cnt <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span>
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<a href="cpp-io-basic_ifstream.html"><span class="kw1732">std::<span class="me2">ifstream</span></span></a> file<span class="sy4">;</span>
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<span class="kw4">char</span> buf<span class="br0">[</span><span class="nu0">1024</span><span class="sy2">*</span><span class="nu0">10</span> <span class="sy2">+</span> <span class="nu0">1</span><span class="br0">]</span><span class="sy4">;</span>
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file.<span class="me1">rdbuf</span><span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>pubsetbuf<span class="br0">(</span>buf, sizeof buf<span class="br0">)</span><span class="sy4">;</span>
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file.<span class="me1">open</span><span class="br0">(</span><span class="st0">"/usr/share/dict/words"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">for</span> <span class="br0">(</span><a href="cpp-string-basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> line<span class="sy4">;</span> getline<span class="br0">(</span>file, line<span class="br0">)</span><span class="sy4">;</span><span class="br0">)</span> <span class="br0">{</span>
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cnt<span class="sy2">++</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1"><<</span> cnt <span class="sy1"><<</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_stringbuf-setbuf.html"><span class="t-lines"><span>setbuf</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>试图以数组替换受控字符序列<br />
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<span class="t-mark">(<code>std::basic_stringbuf<CharT,Traits,Allocator></code> 的虚受保护成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_filebuf-setbuf.html"><span class="t-lines"><span>setbuf</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>提供用户供应的缓冲区，或将此 filebuf 转变为无缓冲<br />
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<span class="t-mark">(<code>std::basic_filebuf<CharT,Traits></code> 的虚受保护成员函数)</span></td>
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<div><a href="cpp-io-strstreambuf-setbuf.html"><span class="t-lines"><span>setbuf</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-cmark">[虚]</span></span></span></div>
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</div>
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</td>
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<td>试图以数组替换受控制字符序列<br />
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<span class="t-mark">(<code>std::strstreambuf</code> 的虚受保护成员函数)</span></td>
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<div><a href="cpp-io-c-setbuf.html"><span class="t-lines"><span>setbuf</span></span></a></div>
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<td>为文件流设置缓冲区<br />
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<span class="t-mark">(函数)</span></td>
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