84 lines
5.2 KiB
HTML
84 lines
5.2 KiB
HTML
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<title>std::experimental::const_where_expression</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_simd_const_where_expression 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::experimental::</span>const_where_expression</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-simd.html">simd</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/simd&action=edit&redlink=1" class="new" title="cpp/header/experimental/simd（页面不存在）"><experimental/simd></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> M, <span class="kw1">class</span> V <span class="sy1">></span><br />
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<span class="kw1">class</span> const_where_expression<span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></td>
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<p>类模板 <code>const_where_expression</code> 抽象给定的算术或数据并行类型 const 对象的被选择元素的概念。被选择元素表示对于所有 i ∈ {j ∈ ℕ | j < M::size() ⋀ mask[j]} 的 data[i] 。</p>
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<h3><span class="mw-headline" id=".E6.A8.A1.E6.9D.BF.E5.BD.A2.E5.8F.82">模板形参</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>M</td>
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<td>-</td>
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<td>掩码类型</td>
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</tr>
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<tr class="t-par">
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<td>V</td>
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<td>-</td>
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<td>要应用 M 到其上的值类型</td>
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<p>(M, V) 的合法组合是： (<span class="t-c"><span class="mw-geshi cpp source-cpp">simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span></span></span>, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> simd<span class="sy1"><</span>T, Abi<span class="sy1">></span></span></span>) 、 (<span class="t-c"><span class="mw-geshi cpp source-cpp">simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span></span></span>, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span></span></span>) 、 (<span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">bool</span></span></span>, <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">const</span> T</span></span>) 。</p>
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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><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/simd/const_where_expression/operator_minus&action=edit&redlink=1" class="new" title="cpp/experimental/simd/const where expression/operator minus（页面不存在）"><span class="t-lines"><span>operator-</span></span></a></div>
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<td>取选择元素的相反数<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/simd/const_where_expression/copy_to&action=edit&redlink=1" class="new" title="cpp/experimental/simd/const where expression/copy to（页面不存在）"><span class="t-lines"><span>copy_to</span></span></a></div>
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</div>
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</td>
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<td>存储选择的元素到地址<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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