102 lines
6.4 KiB
HTML
102 lines
6.4 KiB
HTML
<!DOCTYPE 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::experimental::where_expression</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_simd_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>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 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="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> 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>where_expression</code> 抽象给定的算术或数据并行类型非 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 ∈ ℕ0 | 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>应用 M 到其上的值类型</td>
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</tr>
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</table>
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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">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">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">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 class="t-dsc-member-div">
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<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/simd/where_expression/operator_assign&action=edit&redlink=1" class="new" title="cpp/experimental/simd/where expression/operator assign（页面不存在）"><span class="t-lines"><span>operator=</span></span></a></div>
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</td>
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<td>赋值被选择位置<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/where_expression/compound_operators&action=edit&redlink=1" class="new" title="cpp/experimental/simd/where expression/compound operators（页面不存在）"><span class="t-lines"><span>operator+=</span> <span>operator-=</span> <span>operator*=</span> <span>operator/=</span> <span>operator%=</span> <span>operator&=</span> <span>operator|=</span> <span>operator^=</span> <span>operator<<=</span> <span>operator>>=</span></span></a></div>
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</div>
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</td>
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<td>复合赋值运算符<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/where_expression/inc&action=edit&redlink=1" class="new" title="cpp/experimental/simd/where expression/inc（页面不存在）"><span class="t-lines"><span>operator++</span> <span>operator--</span></span></a></div>
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</div>
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</td>
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<td>自增和自减运算符<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/experimental/simd/where_expression/copy_from&action=edit&redlink=1" class="new" title="cpp/experimental/simd/where expression/copy from（页面不存在）"><span class="t-lines"><span>copy_from</span></span></a></div>
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</div>
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</td>
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<td>从地址加载到被选择位置<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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