80 lines
6.1 KiB
HTML
80 lines
6.1 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::ranges::elements_view<V,N>::iterator<Const>::iterator</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_elements_view_iterator_iterator 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::ranges::elements_view<V,N>::<i>iterator</i><Const>::</span><i>iterator</i></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-ranges.html">ranges</a>‎ | <a href="cpp-ranges-elements_view.html">elements view</a>‎ | <a href="cpp-ranges-elements_view-iterator.html">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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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*iterator*/</span><span class="br0">(</span><span class="br0">)</span> requires std<span class="sy4">::</span><span class="me2">default_initializable</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">>></span><br />
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<span class="sy1">=</span> <span class="kw1">default</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-cxx20">(C++20 起)</span></td>
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<tr class="t-dcl t-since-cxx20">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw1">explicit</span> <span class="coMULTI">/*iterator*/</span><span class="br0">(</span> ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">></span> current <span class="br0">)</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-cxx20">(C++20 起)</span></td>
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</tr>
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="coMULTI">/*iterator*/</span><span class="br0">(</span> <span class="coMULTI">/*iterator*/</span><span class="sy1"><</span><span class="sy3">!</span>Const<span class="sy1">></span> i <span class="br0">)</span> requires Const <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">convertible_to</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>V<span class="sy1">></span>, ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">>></span><span class="sy4">;</span></span></div>
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</td>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 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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<p>构造迭代器。</p>
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<div class="t-li1"><span class="t-li">1)</span> 经由其默认成员初始化器（<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy1">=</span> ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="br0">(</span><span class="br0">)</span></span></span>）<a href="cpp-language-value_initialization.html">值初始化</a>底层迭代器 <code><i>current_</i></code> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 以 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>current<span class="br0">)</span></span></span> 初始化底层迭代器 <code><i>current_</i></code> 。</div>
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<div class="t-li1"><span class="t-li">3)</span> 从 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*iterator*/</span><span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span></span></span> 转换到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*iterator*/</span><span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span></span></span> 。以 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>i.<span class="me1">current</span><span class="br0">)</span></span></span> 初始化底层迭代器 <code><i>current_</i></code> 。</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>current</td>
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<td>-</td>
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<td>指向（可能为 const 限定的） <code>V</code> 中的迭代器</td>
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</tr>
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<tr class="t-par">
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<td>i</td>
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<td>-</td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*iterator*/</span><span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span></span></span></td>
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</tr>
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</table>
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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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<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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