73 lines
4.6 KiB
HTML
73 lines
4.6 KiB
HTML
<!DOCTYPE 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::take_view 的推导指引</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_take_view_deduction_guides skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><code>std::ranges::take_view</code> 的推导指引</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_view.html">take view</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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<div>定义于头文件 <code><a href="cpp-header-ranges.html"><ranges></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> R <span class="sy1">></span><br />
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take_view<span class="br0">(</span> R<span class="sy3">&&</span>, ranges<span class="sy4">::</span><span class="me2">range_difference_t</span><span class="sy1"><</span>R<span class="sy1">></span> <span class="br0">)</span> <span class="sy2">-</span><span class="sy1">></span> take_view<span class="sy1"><</span>views<span class="sy4">::</span><span class="me2">all_t</span><span class="sy1"><</span>R<span class="sy1">>></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-cxx20">(C++20 起)</span></td>
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<p>为 <span class="t-lc">std::ranges::take_view</span> 提供该<a href="cpp-language-class_template_argument_deduction.html">推导指引</a>以允许从 <a href="cpp-ranges-range.html"><code>range</code></a> 和元素数推导。</p>
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<p>若 <code>R</code> 为 <a href="cpp-ranges-view.html"><code>view</code></a> ，则推导的类型为 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">take_view</span><span class="sy1"><</span>R<span class="sy1">></span></span></span> ；否则，推导的类型通常为 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">take_view</span><span class="sy1"><</span>ranges<span class="sy4">::</span><span class="me2">ref_view</span><span class="sy1"><</span>R<span class="sy1">>></span></span></span> 。</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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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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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/issue3447">LWG 3447</a></td>
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<td>C++20</td>
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<td>模板形参 <code>R</code> 以 <a href="cpp-ranges-range.html"><code>range</code></a> 约束</td>
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<td>不约束 <code>R</code> （但 <a href="cpp-ranges-iterator_t.html"><tt>range_difference_t</tt></a> 要求 <a href="cpp-ranges-range.html"><code>range</code></a> ）</td>
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