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web/cppreference-zh/chmhelp/cpp-io-basic_spanbuf-span.html
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web/cppreference-zh/chmhelp/cpp-io-basic_spanbuf-span.html
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<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::basic_spanbuf<CharT,Traits>::span</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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</head>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_io_basic_spanbuf_span skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_spanbuf<CharT,Traits>::</span>span</h1>
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<div id="bodyContent">
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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 id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dcl t-since-cxx23">
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<td>
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<div><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">span</span><span class="sy1"><</span>CharT<span class="sy1">></span> span<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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</tr>
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<tr class="t-dcl t-since-cxx23">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</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> s <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx23">(C++23 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</tbody>
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</table>
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<div class="t-li1"><span class="t-li">1)</span> 若打开模式中设置了 <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::out</a></span> 则获取引用被写入区域的 <code>span</code> ，否则获取引用底层缓冲区的 <code>span</code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 使 <code>basic_spanbuf</code> 进行 <code>s</code> 所引用的缓冲区上的 I/O 。设置指向获取区、放置区或两者的指针。
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<table class="wikitable">
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<tr>
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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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</tr>
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<tr>
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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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</tr>
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<tr>
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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 class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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</tr>
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<tr>
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<td colspan="4"></td>
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</tr>
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<tr>
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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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</tr>
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<tr>
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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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</tr>
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<tr>
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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 class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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</tr>
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<tr>
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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 class="me1">data</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">s.<span class="me1">data</span><span class="br0">(</span><span class="br0">)</span> <span class="sy2">+</span> s.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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</tr>
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</table>
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</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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<table class="t-par-begin">
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<tr class="t-par">
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<td>s</td>
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<td>-</td>
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<td>引用用户提供的缓冲区的 <a href="cpp-container-span.html"><tt>std::span</tt></a></td>
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</tr>
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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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<div class="t-li1"><span class="t-li">1)</span> 若打开模式中设置了 <span class="t-lc"><a href="cpp-io-ios_base-openmode.html">std::ios_base::out</a></span> 则为 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">span</span><span class="sy1"><</span>CharT<span class="sy1">></span><span class="br0">(</span>pbase<span class="br0">(</span><span class="br0">)</span>, pptr<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ，否则为引用整个底层缓冲区的 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">span</span><span class="sy1"><</span>CharT<span class="sy1">></span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> （无）</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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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<tr>
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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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</tr>
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</table>
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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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<tr class="t-dsc">
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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-str.html"><span class="t-lines"><span>str</span></span></a></div>
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</div>
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</td>
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<td>替换或获得关联字符串的副本<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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</tr>
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<tr class="t-dsc">
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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-view.html"><span class="t-lines"><span>view</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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</div>
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</td>
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<td>获得底层字符序列上的视图<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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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-io-strstreambuf-str.html"><span class="t-lines"><span>str</span></span></a></div>
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</div>
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</td>
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<td>标记缓冲为冻结并返回输入序列的起始指针<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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</tr>
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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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</div>
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</div>
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</body>
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</html>
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