142 lines
9.4 KiB
HTML
142 lines
9.4 KiB
HTML
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<title>std::basic_spanbuf<CharT,Traits>::setbuf</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_spanbuf_setbuf 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_spanbuf<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_spanbuf.html">basic spanbuf</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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<a href="cpp-io-basic_streambuf.html"><span class="kw1666">std::<span class="me2">basic_streambuf</span></span></a><span class="sy1"><</span>CharT, Traits<span class="sy1">></span><span class="sy2">*</span> setbuf<span class="br0">(</span> CharT <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> override<span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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<p>使 <code>basic_spanbuf</code> 进行缓冲区 [<code>s</code>, <code>s + n</code>) 上的 I/O 。等价地调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">this<span class="sy2">-</span><span class="sy1">></span>span<span class="br0">(</span>std<span class="sy4">::</span><span class="me2">span</span><span class="sy1"><</span>CharT<span class="sy1">></span><span class="br0">(</span>s, n<span class="br0">)</span><span class="br0">)</span></span></span> 然后返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">this</span></span> 。</p>
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<th rowspan="2">打开模式中设置的位<br />
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（影响指向获取区的指针）</th>
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<th colspan="3">设置后的返回值</th>
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<td><span class="t-lc"><a href="cpp-io-basic_streambuf-gptr.html">eback()</a></span></td>
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<td><span class="t-lc"><a href="cpp-io-basic_streambuf-gptr.html">gptr()</a></span></td>
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<td><span class="t-lc"><a href="cpp-io-basic_streambuf-gptr.html">egptr()</a></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-ios_base-openmode.html"><span class="kw1674">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">in</span></span></a></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s <span class="sy2">+</span> n</span></span></td>
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<td colspan="4"></td>
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<th rowspan="2">打开模式中设置的位<br />
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（影响指向放置区的指针）</th>
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<th colspan="3">设置后的返回值</th>
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<td><span class="t-lc"><a href="cpp-io-basic_streambuf-pptr.html">pbase()</a></span></td>
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<td><span class="t-lc"><a href="cpp-io-basic_streambuf-pptr.html">pptr()</a></span></td>
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<td><span class="t-lc"><a href="cpp-io-basic_streambuf-pptr.html">epptr()</a></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-ios_base-openmode.html"><span class="kw1675">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">out</span></span></a> <span class="sy3">&&</span> <span class="sy3">!</span><a href="cpp-io-ios_base-openmode.html"><span class="kw1677">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">ate</span></span></a></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s <span class="sy2">+</span> n</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-io-ios_base-openmode.html"><span class="kw1675">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">out</span></span></a> <span class="sy3">&&</span> <a href="cpp-io-ios_base-openmode.html"><span class="kw1677">std::<span class="me2">ios_base</span><span class="sy4">::</span><span class="me2">ate</span></span></a></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s <span class="sy2">+</span> n</span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s <span class="sy2">+</span> n</span></span></td>
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<p>此函数为受保护和虚，只可以通过 <code>pubsetbuf()</code> 或派生自 <span class="t-lc">std::basic_spanbuf</span> 的用户定义类的成员函数调用它。</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>s</td>
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<td>-</td>
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<td>指向用户提供的缓冲区的首个 <code>CharT</code> 的指针</td>
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</tr>
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<tr class="t-par">
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<td>n</td>
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<td>-</td>
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<td>用户提供的缓冲区中的 <code>CharT</code> 元素数量</td>
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</table>
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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><span class="t-c"><span class="mw-geshi cpp source-cpp">this</span></span></p>
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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>弃用的流缓冲 <span class="t-lc"><a href="cpp-io-strstreambuf.html">std::strstreambuf</a></span> 或 boost.IOStreams 设备 <a rel="nofollow" class="external text" href="http://www.boost.org/doc/libs/release/libs/iostreams/doc/classes/array.html#array"><code>boost::basic_array</code></a> 亦能实现用户提供的 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 数组上的 I/O 缓冲。</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-empty-cell"></td>
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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 class="t-dsc-member-div">
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<div><a href="cpp-io-basic_streambuf-pubsetbuf.html"><span class="t-lines"><span>pubsetbuf</span></span></a></div>
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</td>
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<td>调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">setbuf<span class="br0">(</span><span class="br0">)</span></span></span><br />
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<span class="t-mark">(<code>std::basic_streambuf<CharT,Traits></code> 的公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-basic_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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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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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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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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