67 lines
5.4 KiB
HTML
67 lines
5.4 KiB
HTML
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<title>operator==(ranges::take_while_view::sentinel)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_ranges_take_while_view_sentinel_operator_cmp skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">operator==<small>(ranges::take_while_view::<i>sentinel</i>)</small></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>‎ | <a href="cpp-ranges-take_while_view-sentinel.html">sentinel</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">friend</span> <span class="kw4">constexpr</span> <span class="kw4">bool</span> operator<span class="sy1">==</span><span class="br0">(</span> <span class="kw4">const</span> ranges<span class="sy4">::</span><span class="me2">iterator_t</span><span class="sy1"><</span>Base<span class="sy1">></span><span class="sy3">&</span> x,<br />
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<span class="kw4">const</span> <span class="coMULTI">/*sentinel*/</span><span class="sy3">&</span> y<span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td>
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<p>比较 <span class="t-c"><span class="mw-geshi cpp source-cpp">take_while_view<span class="sy4">::</span><span class="coMULTI">/*sentinel*/</span></span></span> 与指向（可能为 const 限定的）视图 <code>V</code> 中的迭代器。迭代器常从调用 <a href="cpp-ranges-take_while_view-begin.html"><tt>take_while_view::begin</tt></a> 获得。</p>
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<p>若 <code>x</code> 与 <code>y</code> 的底层哨位（即 <a href="cpp-ranges-take_while_view-sentinel-base.html"><code>y.base()</code></a> ）比较相等或谓词在应用到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>x</span></span> 时返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> 。</p>
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<p>此函数对通常<a href="cpp-language-unqualified_lookup.html">无限定</a>或<a href="cpp-language-qualified_lookup.html">有限定查找</a>不可见，而只能在 <code>take_while_view::<i>sentinel</i><Const></code> 为参数的关联类时由<a href="cpp-language-adl.html">实参依赖查找</a>找到。</p>
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<p><code>!=</code> 运算符从 <code>operator==</code> <a href="cpp-language-operators.html#.E5.85.B3.E7.B3.BB.E8.BF.90.E7.AE.97.E7.AC.A6">合成</a>。</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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<td>x</td>
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<td>-</td>
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<td>要比较的迭代器</td>
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<tr class="t-par">
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<td>y</td>
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<td>-</td>
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<td>要比较的哨位</td>
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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><span class="t-c"><span class="mw-geshi cpp source-cpp">y.<span class="me1">end_</span> <span class="sy1">==</span> x <span class="sy3">||</span> <span class="sy3">!</span><a href="cpp-utility-functional-invoke.html"><span class="kw1058">std::<span class="me2">invoke</span></span></a><span class="br0">(</span><span class="sy2">*</span>y.<span class="me1">pred_</span>, <span class="sy2">*</span>x<span class="br0">)</span></span></span> ，其中 <code><i>end_</i></code> 代表存储的哨位而 <code><i>pred_</i></code> 代表存储的指向谓词的指针。</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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