103 lines
7.6 KiB
HTML
103 lines
7.6 KiB
HTML
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<title>std::ranges::take_while_view<V,Pred>::end</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_take_while_view_end 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::take_while_view<V,Pred>::</span>end</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-take_while_view.html">take while view</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>__SimpleView<span class="sy1"><</span>V<span class="sy1">></span><span class="br0">)</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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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> <span class="kw4">auto</span> end<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires<br /></span>
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<p> ranges<span class="sy4">::</span><span class="me2">range</span><span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span> <span class="sy3">&&</span><br /></p>
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std<span class="sy4">::</span><span class="me2">indirect_unary_predicate</span><span class="sy1"><</span><span class="kw4">const</span> Pred, ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">>></span><span class="sy4">;</span></div>
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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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<td></td>
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<td></td>
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<td></td>
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<p>返回表示视图末尾的<a href="cpp-ranges-take_while_view-sentinel.html">哨位</a>。</p>
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<div class="t-li1"><span class="t-li">1)</span> 等效于返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*sentinel*/</span><span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span>, <a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span>pred<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> ，其中 <code><i>base_</i></code> 代表底层视图。</div>
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<div class="t-li1"><span class="t-li">2)</span> 等效于返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="coMULTI">/*sentinel*/</span><span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span><span class="br0">(</span>ranges<span class="sy4">::</span><span class="me2">end</span><span class="br0">(</span>base_<span class="br0">)</span>, <a href="cpp-memory-addressof.html"><span class="kw757">std::<span class="me2">addressof</span></span></a><span class="br0">(</span>pred<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> ，其中 <code><i>base_</i></code> 代表底层视图。</div>
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<p>若 <code>V</code> 为<a href="cpp-ranges.html#.E8.BE.85.E5.8A.A9.E6.A6.82.E5.BF.B5">简单视图</a>（即 <code>V</code> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> V</span></span> 是拥有相同迭代器与哨位类型的视图）则重载 <span class="t-v">(1)</span> 不参与重载决议。</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>表示视图末尾的<a href="cpp-ranges-take_while_view-sentinel.html">哨位</a>。</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=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
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<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。</p>
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<table class="dsctable" style="font-size:0.8em">
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<tr>
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<th>DR</th>
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<th>应用于</th>
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<th>出版时的行为</th>
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<th>正确行为</th>
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<td><a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3450">LWG 3450</a></td>
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<td>C++20</td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span></span></span> 重载可能返回不可与迭代器比较的哨位</td>
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<td>已约束</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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<table class="t-dsc-begin">
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-take_while_view-begin.html"><span class="t-lines"><span>begin</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>返回指向起始的迭代器<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-ranges-take_while_view-sentinel-operator_cmp.html"><span class="t-lines"><span>operator==</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>比较哨位与从 <a href="cpp-ranges-take_while_view-begin.html"><tt>take_while_view::begin</tt></a> 返回的迭代器<br />
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<span class="t-mark">(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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