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<title>std::basic_string_view<CharT,Traits>::rend, std::basic_string_view<CharT,Traits>::crend</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_string_basic_string_view_rend 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_string_view<CharT,Traits>::</span>rend, <span style="font-size:0.7em; line-height:130%">std::basic_string_view<CharT,Traits>::</span>crend</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-string.html">string</a>‎ | <a href="cpp-string-basic_string_view.html">basic string view</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> const_reverse_iterator rend<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><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> const_reverse_iterator crend<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><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<p>返回指向逆向视图末字符的后一字符的逆向迭代器。它对应非逆向视图的首字符的前趋字符。此字符表现作占位符，试图访问它会导致未定义行为。</p>
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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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<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>指向逆向视图末字符后继字符的 <code>const_reverse_iterator</code></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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<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 <string_view></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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<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">char</span><span class="sy1">></span> out_it<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><span class="sy4">;</span>
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<a href="cpp-string-basic_string_view.html"><span class="kw1248">std::<span class="me2">string_view</span></span></a> str_view<span class="br0">(</span><span class="st0">"abcdef"</span><span class="br0">)</span><span class="sy4">;</span>
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<a href="cpp-algorithm-copy.html"><span class="kw1582">std::<span class="me2">copy</span></span></a><span class="br0">(</span>str_view.<span class="me1">rbegin</span><span class="br0">(</span><span class="br0">)</span>, str_view.<span class="me1">rend</span><span class="br0">(</span><span class="br0">)</span>, out_it<span class="br0">)</span><span class="sy4">;</span>
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<span class="sy2">*</span>out_it <span class="sy1">=</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<a href="cpp-algorithm-copy.html"><span class="kw1582">std::<span class="me2">copy</span></span></a><span class="br0">(</span>str_view.<span class="me1">crbegin</span><span class="br0">(</span><span class="br0">)</span>, str_view.<span class="me1">crend</span><span class="br0">(</span><span class="br0">)</span>, out_it<span class="br0">)</span><span class="sy4">;</span>
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<span class="sy2">*</span>out_it <span class="sy1">=</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></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">fedcba
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fedcba</pre></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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<div class="t-dsc-member-div">
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<div><a href="cpp-string-basic_string_view-rbegin.html"><span class="t-lines"><span>rbegin</span><span>crbegin</span></span></a></div>
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</div>
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</td>
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<td>返回指向起始的反向迭代器<br />
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<span class="t-mark">(公开成员函数)</span></td>
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