137 lines
9.7 KiB
HTML
137 lines
9.7 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::take_view<V>::end</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_take_view_end 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::ranges::take_view<V>::</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_view.html">take 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> begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires 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="sy4">;</span></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 <code>take_view</code> 末尾的迭代器或哨位。 <code>take_view</code> 的末尾是底层范围的第 <code>count</code> 元素的后一位置，或若后者拥有少于 <code>count</code> 个元素则为其末尾。</p>
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<div class="t-li1"><span class="t-li">1)</span> 返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">take_view<span class="sy4">::</span><span class="coMULTI">/*sentinel*/</span><span class="sy1"><</span><span class="kw2">false</span><span class="sy1">></span></span></span>、 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">default_sentinel_t</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">range_iterator_t</span><span class="sy1"><</span>V<span class="sy1">></span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 返回 <span class="t-c"><span class="mw-geshi cpp source-cpp">take_view<span class="sy4">::</span><span class="coMULTI">/*sentinel*/</span><span class="sy1"><</span><span class="kw2">true</span><span class="sy1">></span></span></span>、 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">default_sentinel_t</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">ranges<span class="sy4">::</span><span class="me2">range_iterator_t</span><span class="sy1"><</span><span class="kw4">const</span> V<span class="sy1">></span></span></span> 。</div>
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<p>重载 <span class="t-v">(1)</span> 仅若 <code>V</code> <a href="cpp-ranges.html#.E8.BE.85.E5.8A.A9.E6.A6.82.E5.BF.B5">简单视图</a>（即若 <code>V</code> 与 <code>const V</code> 均为视图且拥有相同迭代器与哨位类型）才参与重载决议。</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>结果依赖于可能为 const 限定的底层视图类型 <code>_Base</code> ，即 <span class="t-c"><span class="mw-geshi cpp source-cpp">V</span></span> （对于重载 <span class="t-v">(1)</span> ）或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> V</span></span> （对于重载 <span class="t-v">(2)</span> ）所满足的概念。</p>
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<p>令 <span class="t-c"><span class="mw-geshi cpp source-cpp">base_</span></span> 为底层视图。</p>
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<table class="wikitable">
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<th rowspan="2" colspan="2">底层视图满足……</th>
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<th colspan="2"><a href="cpp-ranges-random_access_range.html"><code>random_access_range</code></a></th>
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<th>是</th>
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<th>否</th>
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<th rowspan="2"><a href="cpp-ranges-sized_range.html"><code>sized_range</code></a></th>
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<th>是</th>
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<td>ranges::begin(base_) +
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<p>ranges::range_difference_t<Base_>(this->size())}</p>
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</td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">default_sentinel</span></span></span></td>
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<th>否</th>
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<td colspan="2">
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<div class="t-li1"><span class="t-li">1)</span> <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><span class="br0">}</span></span></span></div>
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<div class="t-li1"><span class="t-li">2)</span> <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><span class="br0">}</span></span></span></div>
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</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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<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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</tr>
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<tr>
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<td><a rel="nofollow" class="external text" href="https://wg21.link/P2393R1">P2393R1</a></td>
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<td>C++20</td>
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<td>有符号与无符号整数类间的隐式转换可能失败</td>
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<td>使之为显式</td>
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</tr>
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</table>
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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_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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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-iterator-counted_iterator.html"><span class="t-lines"><span>counted_iterator</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>对到范围结尾距离进行跟踪的迭代器适配器<br />
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<span class="t-mark">(类模板)</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_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_view-begin.html"><tt>take_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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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</body>
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