133 lines
9.3 KiB
HTML
133 lines
9.3 KiB
HTML
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_simd_where 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</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> T, <span class="kw1">class</span> Abi <span class="sy1">></span><br /></span>
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<p>where_expression<span class="sy1"><</span>simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span>, simd<span class="sy1"><</span>T, Abi<span class="sy1">>></span><br />
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where<span class="br0">(</span> <span class="kw4">const</span> <span class="kw1">typename</span> simd<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy4">::</span><span class="me2">mask_type</span><span class="sy3">&</span> mask,<br /></p>
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simd<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy3">&</span> value<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(1)</td>
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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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<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="kw1">class</span> Abi <span class="sy1">></span><br /></span>
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<p>const_where_expression<span class="sy1"><</span>simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span>, <span class="kw4">const</span> simd<span class="sy1"><</span>T, Abi<span class="sy1">>></span><br />
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where<span class="br0">(</span> <span class="kw4">const</span> <span class="kw1">typename</span> simd<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy4">::</span><span class="me2">mask_type</span><span class="sy3">&</span> mask,<br /></p>
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<span class="kw4">const</span> simd<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy3">&</span> value<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(2)</td>
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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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<tr class="t-dcl t-since-parallelism_ts_2">
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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="kw1">class</span> Abi <span class="sy1">></span><br /></span>
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<p>where_expression<span class="sy1"><</span>simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span>, simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">>></span><br />
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where<span class="br0">(</span> <span class="kw4">const</span> nodeduce_t<span class="sy1"><</span>simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">>></span><span class="sy3">&</span> mask,<br /></p>
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simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy3">&</span> value<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(3)</td>
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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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</tr>
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<tr class="t-dcl t-since-parallelism_ts_2">
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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="kw1">class</span> Abi <span class="sy1">></span><br /></span>
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<p>const_where_expression<span class="sy1"><</span>simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span>, <span class="kw4">const</span> simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">>></span><br />
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where<span class="br0">(</span> <span class="kw4">const</span> nodeduce_t<span class="sy1"><</span>simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">>></span><span class="sy3">&</span> mask,<br /></p>
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<span class="kw4">const</span> simd_mask<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy3">&</span> value<span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(4)</td>
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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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<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>where_expression<span class="sy1"><</span><span class="kw4">bool</span>, T<span class="sy1">></span><br /></p>
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where<span class="br0">(</span> <span class="coMULTI">/*see below*/</span> mask, T<span class="sy3">&</span> value <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(5)</td>
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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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</tr>
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<tr class="t-dcl t-since-parallelism_ts_2">
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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>const_where_expression<span class="sy1"><</span><span class="kw4">bool</span>, <span class="kw4">const</span> T<span class="sy1">></span><br /></p>
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where<span class="br0">(</span> <span class="coMULTI">/*see below*/</span> mask, <span class="kw4">const</span> T<span class="sy3">&</span> value <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td>(6)</td>
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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>构造新的 <span class="t-c"><span class="mw-geshi cpp source-cpp">const_where_expression</span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">where_expression</span></span> 。</p>
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<div class="t-li1"><span class="t-li">1-6)</span> 从给定的 mask 和 value 参数构造 where_expression 。</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<div class="t-li1"><span class="t-li">1-4)</span>
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<td>mask</td>
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<td>-</td>
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<td><code>simd_mask</code> 对象</td>
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<td>value</td>
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<td>-</td>
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<td>到应用掩码于其上的对象的引用</td>
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<div class="t-li1"><span class="t-li">5-6)</span>
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<td>mask</td>
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<td>-</td>
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<td><code>bool</code> 类型掩码</td>
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<tr class="t-par">
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<td>value</td>
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<td>-</td>
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<td>到应用掩码于其上的标量的引用</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>构造的 <span class="t-c"><span class="mw-geshi cpp source-cpp">const_where_expression</span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp">where_expression</span></span> 。</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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<div class="t-li1"><span class="t-li">5-6)</span> 使用掩码的实现定义类型，以之禁用从其他类型到 bool 的隐式转换。</div>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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