110 lines
6.3 KiB
HTML
110 lines
6.3 KiB
HTML
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<title>std::default_sentinel_t, std::default_sentinel</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>default_sentinel_t, <span style="font-size:0.7em; line-height:130%">std::</span>default_sentinel</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-iterator.html">iterator</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-iterator.html"><iterator></a></code></div>
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<td></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">struct</span> default_sentinel_t <span class="br0">{</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="kw1">inline</span> <span class="kw4">constexpr</span> default_sentinel_t default_sentinel<span class="br0">{</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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<div class="t-li1"><span class="t-li">1)</span> <code>default_sentinel_t</code> 是用于表示范围结尾的空类类型。能与知晓其范围边界的迭代器类型（例如 <span class="t-lc">std::counted_iterator</span> ）一同使用它。</div>
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<div class="t-li1"><span class="t-li">2)</span> <code>default_sentinel</code> 是 <code>default_sentinel_t</code> 类型常量。</div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="cpp source-cpp">
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<pre class="de1"><span class="co2">#include <iterator></span>
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<span class="co2">#include <algorithm></span>
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<span class="co2">#include <list></span>
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<span class="co2">#include <iostream></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="cpp-container-list.html"><span class="kw1275">std::<span class="me2">list</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span> l<span class="br0">{</span><span class="nu0">3</span>,<span class="nu0">1</span>,<span class="nu0">4</span>,<span class="nu0">1</span>,<span class="nu0">5</span>,<span class="nu0">9</span>,<span class="nu0">2</span>,<span class="nu0">6</span><span class="br0">}</span><span class="sy4">;</span>
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std<span class="sy4">::</span><span class="me2">ranges</span><span class="sy4">::</span><span class="me2">copy</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">counted_iterator</span><span class="br0">(</span><a href="cpp-iterator-begin.html"><span class="kw676">std::<span class="me2">begin</span></span></a><span class="br0">(</span>l<span class="br0">)</span>, <span class="nu0">4</span><span class="br0">)</span>,
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std<span class="sy4">::</span><span class="me2">default_sentinel</span>, <a href="cpp-iterator-ostream_iterator.html"><span class="kw670">std::<span class="me2">ostream_iterator</span></span></a><span class="sy1"><</span><span class="kw4">int</span><span class="sy1">></span><span class="br0">{</span><a href="cpp-io-cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a>, <span class="st0">" "</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">3 1 4 1</pre></div>
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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-iterator-istream_iterator.html"><span class="t-lines"><span>istream_iterator</span></span></a></div>
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</div>
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<td>从 <span class="t-lc"><a href="cpp-io-basic_istream.html">std::basic_istream</a></span> 读取的输入迭代器<br />
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<span class="t-mark">(类模板)</span></td>
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<div><a href="cpp-iterator-istreambuf_iterator.html"><span class="t-lines"><span>istreambuf_iterator</span></span></a></div>
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</div>
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<td>从 <span class="t-lc"><a href="cpp-io-basic_streambuf.html">std::basic_streambuf</a></span> 读取的输入迭代器<br />
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<span class="t-mark">(类模板)</span></td>
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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>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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