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‎issue4280.html‎

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<!DOCTYPE html>
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<html lang="en">
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<meta charset="utf-8">
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<title>Issue 4280: simd::partial_load uses undefined identifier T</title>
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<meta property="og:title" content="Issue 4280: simd::partial_load uses undefined identifier T">
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<meta property="og:description" content="C++ library issue. Status: New">
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<p><em>This page is a snapshot from the LWG issues list, see the <a href="lwg-active.html">Library Active Issues List</a> for more information and the meaning of <a href="lwg-active.html#New">New</a> status.</em></p>
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<h3 id="4280"><a href="lwg-active.html#4280">4280</a>. <code class='backtick'>simd::partial_load</code> uses undefined identifier <code class='backtick'>T</code></h3>
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<p><b>Section:</b> 29.10.7.7 <a href="https://wg21.link/simd.loadstore">[simd.loadstore]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Tim Song <b>Opened:</b> 2025-06-21 <b>Last modified:</b> 2025-06-21</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#New">New</a> status.</p>
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<p><b>Discussion:</b></p>
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<p>
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The <i>Effects:</i> element of <code class='backtick'>std::simd::partial_load</code> (after the latest rename) uses <code class='backtick'>T</code>
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but that is not defined anywhere. It should be <code class='backtick'>V::value_type</code>.
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<p/>
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Also, this paragraph should be a <i>Returns:</i> element.
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</p>
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<p id="res-4280"><b>Proposed resolution:</b></p>
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<p>
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This wording is relative to <a href="https://wg21.link/N5008">N5008</a>.
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</p>
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<ol>
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<li><p>Modify 29.10.7.7 <a href="https://wg21.link/simd.loadstore">[simd.loadstore]</a> as indicated:</p>
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<blockquote>
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<pre><code>
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template&lt;class V = <i>see below</i>, ranges::contiguous_range R, class... Flags&gt;
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requires ranges::sized_range&lt;R&gt;
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constexpr V partial_load(R&amp;&amp; r, flags&lt;Flags...&gt; f = {});
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[&hellip;]
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template&lt;class V = <i>see below</i>, contiguous_iterator I, sized_sentinel_for&lt;I&gt; S, class... Flags&gt;
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constexpr V partial_load(I first, S last, const typename V::mask_type&amp; mask,
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flags&lt;Flags...&gt; f = {});
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</code></pre>
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<blockquote>
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<p>
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-6- [&hellip;]
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<p/>
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-7- <i>Mandates</i>: [&hellip;]
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<p/>
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-8- <i>Preconditions</i>: [&hellip;]
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<p/>
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-9- <del><i>Effects</i>: Initializes the</del><ins><i>Returns</i>: A <code class='backtick'>basic_simd</code> object
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whose</ins> <code><i>i</i></code><sup>th</sup> element <ins>is initialized</ins> with
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<code>mask[<i>i</i>] &amp;&amp; <i>i</i> &lt; ranges::size(r) ? static_cast&lt;T&gt;(ranges::data(r)[<i>i</i>]) : T()</code>
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for all <code><i>i</i></code> in the range of <code>[0, V::size())</code><ins>, where <code class='backtick'>T</code> is <code class='backtick'>V::value_type</code></ins>.
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<p/>
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-10- <i>Remarks</i>: The default argument for template parameter <code class='backtick'>V</code> is <code>basic_simd&lt;ranges::range_value_t&lt;R&gt;&gt;</code>.
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</p>
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</blockquote>
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</li>
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</ol>
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</body>
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</html>

‎lwg-active.html‎

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‎lwg-closed.html‎

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‎lwg-defects.html‎

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‎lwg-immediate.html‎

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<td align="left">Date:</td>
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<td align="left">Revised 2025-06-21 at 13:19:11 UTC
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<td align="left">Revised 2025-06-21 at 13:51:26 UTC
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‎lwg-index-open.html‎

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<p>This document is the Index by Section for the <a href="lwg-active.html">Library Active Issues List</a>.</p>
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<h2>Index by Section (non-Ready active issues only)</h2>
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<p><a href="lwg-index.html">(view all issues)</a></p>
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<p>Revised 2025-06-21 at 13:51:26 UTC
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</p><h2 id="Section_3">Section 3 (2 issues)</h2>
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<td id="4280"><a href="lwg-active.html#4280" title="simd::partial_load uses undefined identifier T (Status: New)">4280</a><sup><a href="https://cplusplus.github.io/LWG/issue4280">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>29.10.7.7 [simd.loadstore]<a id="simd.loadstore"></a></td>
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<td><code class='backtick'>simd::partial_load</code> uses undefined identifier <code class='backtick'>T</code></td>
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<td>Yes</td>
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<td></td>
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<td></td>
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</tr>
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<td id="4238"><a href="lwg-active.html#4238" title="simd_mask&lt;complex&lt;double&gt;&gt;::operator+/-/~ return a disabled simd specialization (Status: New)">4238</a><sup><a href="https://cplusplus.github.io/LWG/issue4238">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>29.10.8.4 [simd.mask.unary]<a id="simd.mask.unary"></a></td>

‎lwg-index.html‎

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<p>This document is the Index by Section for the <a href="lwg-active.html">Library Active Issues List</a>, <a href="lwg-defects.html">Library Defect Reports and Accepted Issues</a>, and <a href="lwg-closed.html">Library Closed Issues List</a>.</p>
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<p>Revised 2025-06-21 at 13:51:26 UTC
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<td id="4280"><a href="lwg-active.html#4280" title="simd::partial_load uses undefined identifier T (Status: New)">4280</a><sup><a href="https://cplusplus.github.io/LWG/issue4280">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>29.10.7.7 [simd.loadstore]<a id="simd.loadstore"></a></td>
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<td><code class='backtick'>simd::partial_load</code> uses undefined identifier <code class='backtick'>T</code></td>
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<td>Yes</td>
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<td></td>
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<td></td>
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<td id="4238"><a href="lwg-active.html#4238" title="simd_mask&lt;complex&lt;double&gt;&gt;::operator+/-/~ return a disabled simd specialization (Status: New)">4238</a><sup><a href="https://cplusplus.github.io/LWG/issue4238">(i)</a></sup></td>
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‎lwg-ready.html‎

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<td align="left">Date:</td>
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This document is the Index by Status and Date for the <a href="lwg-active.html">Library Active Issues List</a>,
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<a href="lwg-defects.html">Library Defect Reports and Accepted Issues</a>, and <a href="lwg-closed.html">Library Closed Issues List</a>.
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<p>Revised 2025-06-21 at 13:51:26 UTC
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</p><h2 id="Voting">Voting (24 issues)</h2>
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<td id="4280"><a href="lwg-active.html#4280" title="simd::partial_load uses undefined identifier T (Status: New)">4280</a><sup><a href="https://cplusplus.github.io/LWG/issue4280">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>29.10.7.7 [simd.loadstore]</td>
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<td><code class='backtick'>simd::partial_load</code> uses undefined identifier <code class='backtick'>T</code></td>
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<td>Yes</td>
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<td></td>
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<td></td>
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</tr>
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<td id="4279"><a href="lwg-active.html#4279" title="&sect;[fs.op.absolute] Non-normative encouragement should be Recommended practice (Status: New)">4279</a><sup><a href="https://cplusplus.github.io/LWG/issue4279">(i)</a></sup></td>
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<td>31.12.13.2 [fs.op.absolute]</td>

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<a href="lwg-defects.html">Library Defect Reports and Accepted Issues</a>, and <a href="lwg-closed.html">Library Closed Issues List</a>.
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</p><h2 id="Voting">Voting (24 issues)</h2>
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<td id="4280"><a href="lwg-active.html#4280" title="simd::partial_load uses undefined identifier T (Status: New)">4280</a><sup><a href="https://cplusplus.github.io/LWG/issue4280">(i)</a></sup></td>
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<td>29.10.7.7 [simd.loadstore]</td>
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<td><code class='backtick'>simd::partial_load</code> uses undefined identifier <code class='backtick'>T</code></td>
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<td>Yes</td>
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<td></td>
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<td></td>
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<td>29.10.8.4 [simd.mask.unary]</td>

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