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<title>std::basic_streambuf<CharT,Traits>::basic_streambuf</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>basic_streambuf</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">protected</span><span class="sy4">:</span><br />
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basic_streambuf<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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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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basic_streambuf<span class="br0">(</span><span class="kw4">const</span> basic_streambuf<span class="sy3">&</span> rhs<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div class="t-li1"><span class="t-li">1)</span> 构造 <code>basic_streambuf</code> 对象，初始化六个成员（ <code>eback()</code> 、 <code>gptr()</code> 、 <code>egptr()</code> 、 <code>pbase()</code> 、 <code>pptr()</code> 和 <code>epptr()</code> ）为空指针值， locale 成员为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-locale-locale.html"><span class="kw1894">std::<span class="me2">locale</span></span></a><span class="br0">(</span><span class="br0">)</span></span></span> ，构造时的全局 C++ 本地环境的副本。</div>
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<div class="t-li1"><span class="t-li">2)</span> 从 <code>rhs</code> 复制构造，初始化六个指针和 locale 对象为 <code>rhs</code> 所保有值的副本。注意这是浅复制：新构造的 basic_streambuf 的指针指向的字符数组与 <code>rhs</code> 的相同。</div>
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<p>两个构造函数均为受保护，而且仅为具体的 streambuf 类，如 <span class="t-lc"><a href="cpp-io-basic_filebuf.html">std::basic_filebuf</a></span> 、 <span class="t-lc"><a href="cpp-io-basic_stringbuf.html">std::basic_stringbuf</a></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-strstreambuf.html"><span class="kw1752">std::<span class="me2">strstreambuf</span></span></a></span></span> 调用。</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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<td>rhs</td>
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<td>-</td>
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<td>要复制的 streambuf 对象</td>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>C++11 前， <code>basic_streambuf</code> 或其任何派生类是否为<a href="cpp-named_req-CopyConstructible.html"><span style="font-style:italic">可复制构造</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span></a> 是未指定的（ <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue421">LWG 问题 421</a> ），而不同的 C++ 库实现提供不同的选项。</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_filebuf-basic_filebuf.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<td>构造 basic_filebuf 对象<br />
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<span class="t-mark">(<code>std::basic_filebuf<CharT,Traits></code> 的公开成员函数)</span></td>
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<div><a href="cpp-io-basic_stringbuf-basic_stringbuf.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<td>构造一个 basic_stringbuf 对象<br />
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<span class="t-mark">(<code>std::basic_stringbuf<CharT,Traits,Allocator></code> 的公开成员函数)</span></td>
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<div><a href="cpp-io-strstreambuf-strstreambuf.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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<td>构造 strstreambuf 对象<br />
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<span class="t-mark">(<code>std::strstreambuf</code> 的公开成员函数)</span></td>
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