126 lines
7.3 KiB
HTML
126 lines
7.3 KiB
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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<title>std::reverse_iterator<Iter>::operator*,-></title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_iterator_reverse_iterator_operator 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::reverse_iterator<Iter>::</span>operator*,-></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-iterator.html">iterator</a>‎ | <a href="cpp-iterator-reverse_iterator.html">reverse iterator</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></tbody>
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<tbody class="t-dcl-rev t-dcl-rev-num">
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<td></td>
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<td rowspan="142">(1)</td>
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<td></td>
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<tr class="t-dcl t-until-cxx17">
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<div><span class="mw-geshi cpp source-cpp">reference operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> reference operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><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-cxx17">(C++17 起)</span></td>
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<td rowspan="142">(2)</td>
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<tr class="t-dcl t-until-cxx17">
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<div><span class="mw-geshi cpp source-cpp">pointer operator<span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-until-cxx17">(C++17 前)</span></td>
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<tr class="t-dcl t-since-cxx17 t-until-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> pointer operator<span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><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-cxx17">(C++17 起)</span><br />
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<span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<tr class="t-dcl t-since-cxx20">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> pointer operator<span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><br /></span>
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<p> requires <span class="br0">(</span><a href="cpp-types-is_pointer.html"><span class="kw463">std::<span class="me2">is_pointer_v</span></span></a><span class="sy1"><</span>Iter<span class="sy1">></span> <span class="sy3">||</span><br /></p>
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requires <span class="br0">(</span><span class="kw4">const</span> Iter i<span class="br0">)</span> <span class="br0">{</span> i.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span> <span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<td></td>
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<p>返回指向 <code>current</code> 前一元素的引用或指针。</p>
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<div class="t-li1"><span class="t-li">1)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">Iter tmp <span class="sy1">=</span> current<span class="sy4">;</span> <span class="kw1">return</span> <span class="sy2">*--</span>tmp<span class="sy4">;</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> <a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span>operator<span class="sy2">*</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</div>
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</td>
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<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td>
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<div class="t-li1"><span class="t-li">2)</span> 若 <code>Iter</code> 为指针类型则等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> current <span class="sy2">-</span> <span class="nu0">1</span><span class="sy4">;</span></span></span> 。否则等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> <a href="cpp-iterator-prev.html"><span class="kw675">std::<span class="me2">prev</span></span></a><span class="br0">(</span>current<span class="br0">)</span>.<span class="me1">operator</span><span class="sy2">-</span><span class="sy1">></span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</div>
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</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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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 <code>current</code> 前一元素的引用或指针。</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 class="t-dsc-member-div">
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<div><a href="cpp-iterator-reverse_iterator-operator_at.html"><span class="t-lines"><span>operator[]</span></span></a></div>
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</div>
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</td>
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<td>按索引访问元素<br />
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<span class="t-mark">(公开成员函数)</span></td>
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