92 lines
5.5 KiB
HTML
92 lines
5.5 KiB
HTML
<!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::span<T,Extent>::rbegin</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_container_span_rbegin skin-cppreference2 action-view cpp-page-template 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::span<T,Extent>::</span>rbegin</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-container.html">container</a>‎ | <a href="cpp-container-span.html">span</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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<div class="t-page-template" style="">
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<p></p>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> reverse_iterator rbegin<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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<p>返回指向逆向 <code>span</code> 首元素的逆向迭代器。它对应非逆向 <code>span</code> 的末元素。若 <code>span</code> 为空，则返回的迭代器等于 <span class="t-lc">rend()</span> 。</p>
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<div class="t-image">
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<p><img alt="range-rbegin-rend.svg" src="range-rbegin-rend.svg" width="589" height="250" /></p>
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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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<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>指向首元素的逆向迭代器。</p>
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<h3><span class="mw-headline" id=".E5.A4.8D.E6.9D.82.E5.BA.A6">复杂度</span></h3>
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<p>常数。</p>
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<p><br /></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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<div class="t-example">
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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 <algorithm></span>
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<span class="co2">#include <iostream></span>
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<span class="co2">#include <iterator></span>
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<span class="co2">#include <span></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">constexpr</span> std<span class="sy4">::</span><span class="me2">span</span><span class="sy1"><</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy1">></span> code<span class="br0">{</span> <span class="st0">"@droNE_T0P_w$s@s#_SECRET_a,p^42!"</span> <span class="br0">}</span><span class="sy4">;</span>
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<span class="kw4">auto</span> hacker <span class="sy1">=</span> <span class="br0">[</span><span class="br0">]</span><span class="br0">(</span><span class="kw4">const</span> <span class="kw4">unsigned</span> O<span class="br0">)</span> <span class="br0">{</span> <span class="kw1">return</span> O<span class="sy2">-</span><span class="nu8">0141</span><span class="sy1"><</span><span class="nu0">120</span><span class="sy4">;</span> <span class="br0">}</span><span class="sy4">;</span>
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<a href="cpp-algorithm-copy.html"><span class="kw1583">std::<span class="me2">copy_if</span></span></a><span class="br0">(</span>code.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</span>, code.<span class="me1">rend</span><span class="br0">(</span><span class="br0">)</span>,
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<a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1"><</span><span class="kw4">const</span> <span class="kw4">char</span><span class="sy1">></span><span class="br0">(</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a><span class="br0">)</span>, hacker<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">password</pre></div>
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</div>
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</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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<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-container-span-rend.html"><span class="t-lines"><span>rend</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>返回指向末尾的逆向迭代器<br />
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<span class="t-mark">(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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</body>
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