100 lines
6.0 KiB
HTML
100 lines
6.0 KiB
HTML
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<title>std::ranges::subrange<I,S,K>::begin</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_subrange_begin 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::subrange<I,S,K>::</span>begin</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-subrange.html">subrange</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> I begin<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span> requires std<span class="sy4">::</span><span class="me2">copyable</span><span class="sy1"><</span>I<span class="sy1">></span><span class="sy4">;</span></span></div>
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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="br0">[</span><span class="br0">[</span>nodiscard<span class="br0">]</span><span class="br0">]</span> <span class="kw4">constexpr</span> I begin<span class="br0">(</span><span class="br0">)</span> requires <span class="br0">(</span><span class="sy3">!</span>std<span class="sy4">::</span><span class="me2">copyable</span><span class="sy1"><</span>I<span class="sy1">></span><span class="br0">)</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>获得指向 <code>subrange</code> 首元素的迭代器，或若视图为空则为尾迭代器。</p>
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<p><img alt="range-begin-end.svg" src="range-begin-end.svg" width="546" height="157" /></p>
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<div class="t-li1"><span class="t-li">1)</span> 若迭代器类型可复制，则返回存储的迭代器的副本。</div>
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<div class="t-li1"><span class="t-li">2)</span> 若迭代器类型不可复制，则返回从存储的迭代器移动构造的迭代器。</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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<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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<div class="t-li1"><span class="t-li">1)</span> 从存储的迭代器复制构造的迭代器。</div>
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<div class="t-li1"><span class="t-li">2)</span> 从存储的迭代器移动构造的迭代器。</div>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>调用 <span class="t-v">(2)</span> 可能将存储的迭代器置于合法但未指定的状态，取决于 <code>I</code> 的构造函数的行为。</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=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-ranges-subrange-end.html"><span class="t-lines"><span>end</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>获得哨位<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-iterator-begin.html"><span class="t-lines"><span>begin</span><span>cbegin</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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</div>
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</td>
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<td>返回指向容器或数组起始的迭代器<br />
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<span class="t-mark">(函数模板)</span></td>
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<div><a href="cpp-ranges-begin.html"><span class="t-lines"><span>ranges::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>返回指向范围起始的迭代器<br />
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<span class="t-mark">(定制点对象)</span></td>
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