113 lines
6.3 KiB
HTML
113 lines
6.3 KiB
HTML
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<title>std::logical_not<void></title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_functional_logical_not_void 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::</span>logical_not<void></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-utility.html">utility</a>‎ | <a href="cpp-utility-functional.html">functional</a></span></div>
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<div>定义于头文件 <code><a href="cpp-header-functional.html"><functional></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><></span><br />
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<span class="kw1">class</span> logical_not<span class="sy1"><</span><span class="kw4">void</span><span class="sy1">></span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-logical_not.html"><span class="kw1043">std::<span class="me2">logical_not</span></span></a><span class="sy1"><></span></span></span> 是 <span class="t-lc"><a href="cpp-utility-functional-logical_not.html">std::logical_not</a></span> 的特化，拥有待推导的参数和返回类型。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
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<td>成员类型</td>
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<td>定义</td>
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<td><code>is_transparent</code></td>
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<td>/* 未指定 */</td>
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<h3><span class="mw-headline" id="Member_functions">Member functions</span></h3>
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<div><strong class="selflink"><span class="t-lines"><span>operator()</span></span></strong></div>
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<td>到其参数<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h2><span class="mw-headline" id="std::logical_not.3C.3E::operator.28.29"><span style="font-size:0.7em; line-height:130%">std::logical_not<>::</span>operator()</span></h2>
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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> T <span class="sy1">></span><br /></span>
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<p><span class="kw4">constexpr</span> <span class="kw4">auto</span> operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> T<span class="sy3">&&</span> arg <span class="br0">)</span> <span class="kw4">const</span><br /></p>
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<span class="sy2">-</span><span class="sy1">></span> decltype<span class="br0">(</span><span class="sy3">!</span><a href="cpp-utility-forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1"><</span>T<span class="sy1">></span><span class="br0">(</span>arg<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></div>
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<p>返回 <code>!arg</code> 的结果。</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>arg</td>
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<td>-</td>
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<td>应用逻辑非到的值</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"><span class="sy3">!</span>arg</span></span> 的结果。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>成员类型 <code>is_transparent</code> 指示调用方，此函数对象是一个<i>通透</i>函数对象：它接受任意类型的参数并使用完美转发，这在将函数对象在多种语境中，或以右值参数使用时，避免不需要的复制和转换。特别是，诸如 <span class="t-lc"><a href="cpp-container-set-find.html">std::set::find</a></span> 和 <span class="t-lc"><a href="cpp-container-set-lower_bound.html">std::set::lower_bound</a></span> 的模板函数在其 <code>Compare</code> 类型上使用此类型。</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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