89 lines
4.6 KiB
HTML
89 lines
4.6 KiB
HTML
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<title>std::ranges::take_while_view<V,Pred>::take_while_view</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_take_while_view_take_while_view 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>take_while_view</h1>
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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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<table class="t-dcl-begin">
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<div><span class="mw-geshi cpp source-cpp">take_while_view<span class="br0">(</span><span class="br0">)</span> requires std<span class="sy4">::</span><span class="me2">default_initializable</span><span class="sy1"><</span>V<span class="sy1">></span> <span class="sy3">&&</span><br />
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std<span class="sy4">::</span><span class="me2">default_initializable</span><span class="sy1"><</span>Pred<span class="sy1">></span> <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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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> take_while_view<span class="br0">(</span> V base, Pred pred <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 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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<p>构造 <code>take_while_view</code> 。</p>
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<div class="t-li1"><span class="t-li">1)</span> 默认构造函数。<a href="cpp-language-value_initialization.html">值初始化</a>底层哨位与谓词。</div>
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<div class="t-li1"><span class="t-li">2)</span> 从 <code>base</code> 移动构造底层视图并从 <code>pred</code> 移动构造谓词。</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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<td>base</td>
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<td>-</td>
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<td>底层视图</td>
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</tr>
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<tr class="t-par">
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<td>fun</td>
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<td>-</td>
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<td>谓词</td>
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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-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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</table>
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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://wg21.link/P2325R3">P2325R3</a></td>
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<td>C++20</td>
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<td>若 <code>Pred</code> 非 <a href="cpp-concepts-default_initializable.html"><code>default_initializable</code></a> ，<br />
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则默认构造函数构造不含 <code>Pred</code> 的 <code>take_while_view</code></td>
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<td><code>take_while_view</code> 亦非<br />
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<a href="cpp-concepts-default_initializable.html"><code>default_initializable</code></a></td>
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