176 lines
8.7 KiB
HTML
176 lines
8.7 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::bit_and</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_utility_functional_bit_and 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>bit_and</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 id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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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> <span class="kw1">class</span> T <span class="sy1">></span><br />
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<span class="kw1">struct</span> bit_and<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 前)</span></td>
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<tr class="t-dcl t-since-cxx14">
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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> <span class="kw4">void</span> <span class="sy1">></span><br />
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<span class="kw1">struct</span> bit_and<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>进行逐位与的函数对象。等效地调用类型 <code>T</code> 上的 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy3">&</span></span></span> 。</p>
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<h3><span class="mw-headline" id=".E7.89.B9.E5.8C.96">特化</span></h3>
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<table class="t-rev-begin">
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<p>标准库提供 <code>std::bit_and</code> 在不指定 <code>T</code> 时的特化，它使得参数类型和返回类型留待推导。</p>
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<div><a href="cpp-utility-functional-bit_and_void.html"><span class="t-lines"><span>bit_and<span class="t-dsc-small"><void></span></span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx14">(C++14)</span></span></span></div>
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<td>实现 <span class="t-c"><span class="mw-geshi cpp source-cpp">x <span class="sy3">&</span> y</span></span> 并推导参数和返回类型的函数对象<br />
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<span class="t-mark">(类模板特化)</span></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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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>类型</td>
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<td>定义</td>
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<td><code>result_type</code> <span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></td>
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<td><code>T</code></td>
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<td><code>first_argument_type</code> <span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></td>
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<td><code>T</code></td>
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<td><code>second_argument_type</code> <span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></td>
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<td><code>T</code></td>
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<p>这些成员类型由公开继承 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-utility-functional-binary_function.html"><span class="kw1125">std::<span class="me2">binary_function</span></span></a><span class="sy1"><</span>T, T, T<span class="sy1">></span></span></span> 获得。</p>
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<td><span class="t-mark-rev t-until-cxx11">(C++11 前)</span></td>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div><span class="t-lines"><span>operator()</span></span></div>
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<td>返回二个参数逐位与的结果<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::bit_and::operator.28.29"><span style="font-size:0.7em; line-height:130%">std::bit_and::</span>operator()</span></h2>
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<div><span class="mw-geshi cpp source-cpp">T operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&</span> lhs, <span class="kw4">const</span> T<span class="sy3">&</span> rhs <span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-until-cxx14">(C++14 前)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">constexpr</span> T operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span> <span class="kw4">const</span> T<span class="sy3">&</span> lhs, <span class="kw4">const</span> T<span class="sy3">&</span> rhs <span class="br0">)</span> <span class="kw4">const</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>返回 <code>lhs</code> 和 <code>rhs</code> 逐位与的结果。</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>lhs, rhs</td>
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<td>-</td>
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<td>要计算逐位与的值</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">lhs <span class="sy3">&</span> rhs</span></span> 的结果。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>可能抛出实现定义的异常。</p>
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<h3><span class="mw-headline" id=".E5.8F.AF.E8.83.BD.E7.9A.84.E5.AE.9E.E7.8E.B0">可能的实现</span></h3>
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<pre class="de1"><span class="kw4">constexpr</span> T operator<span class="br0">(</span><span class="br0">)</span><span class="br0">(</span><span class="kw4">const</span> T <span class="sy3">&</span>lhs, <span class="kw4">const</span> T <span class="sy3">&</span>rhs<span class="br0">)</span> <span class="kw4">const</span>
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<span class="br0">{</span>
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<span class="kw1">return</span> lhs <span class="sy3">&</span> rhs<span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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