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<title>std::basic_streambuf<CharT,Traits>::uflow</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_streambuf_uflow skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_streambuf<CharT,Traits>::</span>uflow</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"><span class="kw1">virtual</span> int_type uflow<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>通过更新指向输入区的指针（若需要），确保输入区中至少一个字符可用。成功时返回字符的值，并令<i>获取指针</i>的值前进一个字符。失败时返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">traits<span class="sy4">::</span><span class="me2">eof</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</p>
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<p>函数可以更新 <code>gptr</code> 、 <code>egptr</code> 和 <code>eback</code> 指针，以定义新加载的数据位置（若存在）。失败时，函数确保 <span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> nullptr</span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> egptr</span></span> 。</p>
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<p>函数的基类版本调用 <span class="t-lc"><a href="cpp-io-basic_streambuf-underflow.html">underflow()</a></span> 并自增 <span class="t-lc"><a href="cpp-io-basic_streambuf-gptr.html">gptr()</a></span> 。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>（无）</p>
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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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<p>成功时为<i>获取指针</i>前进一之前所指向的字符的值，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">traits<span class="sy4">::</span><span class="me2">eof</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</p>
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<p>函数的基类版本返回 <span class="t-lc"><a href="cpp-io-basic_streambuf-underflow.html">underflow()</a></span> 所返回的值。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p><span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::streambuf</a></span> 的公开函数仅若 <span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">==</span> nullptr</span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">gptr<span class="br0">(</span><span class="br0">)</span> <span class="sy1">>=</span> egptr<span class="br0">(</span><span class="br0">)</span></span></span> 才调用此函数。</p>
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<p>要求不使用获取区且不设置 basic_streambuf 中获取区指针的定制 streambuf 类覆写此函数。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-io-basic_streambuf-underflow.html"><span class="t-lines"><span>underflow</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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<td>从关联输入序列读取字符到获取区<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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<div><a href="cpp-io-basic_streambuf-overflow.html"><span class="t-lines"><span>overflow</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>从放置区写入字符到关联的输出序列<br />
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<span class="t-mark">(虚受保护成员函数)</span></td>
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