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‎issue4243.html‎

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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="4243"><a href="lwg-active.html#4243">4243</a>. <code class='backtick'>as_bytes</code>/<code class='backtick'>as_writable_bytes</code> is broken with <code>span&lt;volatile T&gt;</code></h3>
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<p><b>Section:</b> 23.7.2.3 <a href="https://wg21.link/span.objectrep">[span.objectrep]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Hewill Kang <b>Opened:</b> 2025-04-12 <b>Last modified:</b> 2025-04-13</p>
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<b>Submitter:</b> Hewill Kang <b>Opened:</b> 2025-04-12 <b>Last modified:</b> 2025-04-21</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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}
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</pre></blockquote>
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<p><strong>Previous resolution [SUPERSEDED]:</strong></p>
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<blockquote class="note">
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<p id="res-4243"><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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</li>
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</ol>
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</blockquote>
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<p><i>[2025-04-16; Hewill Kang provides alternative wording]</i></p>
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<p>
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Based on reflector feedback, the revised wording just improves the current state of not supporting
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support for <code class='backtick'>volatile</code>.
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</p>
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<p id="res-4243"><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 23.7.2.3 <a href="https://wg21.link/span.objectrep">[span.objectrep]</a> as indicated:</p>
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<blockquote>
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<pre>
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template&lt;class ElementType, size_t Extent&gt;
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span&lt;const byte, Extent == dynamic_extent ? dynamic_extent : sizeof(ElementType) * Extent&gt;
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as_bytes(span&lt;ElementType, Extent&gt; s) noexcept;
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Constraints</i>: <code>is_volatile_v&lt;ElementType&gt;</code> is <code class='backtick'>false</code>.</ins>
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</p>
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<p>
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-1- <i>Effects</i>: Equivalent to: <code>return R{reinterpret_cast&lt;const byte*&gt;(s.data()), s.size_bytes()};</code><br/>
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where <code>R</code> is the return type.
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</p>
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</blockquote>
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<pre>
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template&lt;class ElementType, size_t Extent&gt;
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span&lt;byte, Extent == dynamic_extent ? dynamic_extent : sizeof(ElementType) * Extent&gt;
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as_writable_bytes(span&lt;ElementType, Extent&gt; s) noexcept;
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</pre>
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<blockquote>
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<p>
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-2- <i>Constraints</i>: <code>is_const_v&lt;ElementType&gt;</code> is <code class='backtick'>false</code> <ins>and
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<code>is_volatile_v&lt;ElementType&gt;</code> is <code class='backtick'>false</code></ins>.
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</p>
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<p>
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-3- <i>Effects</i>: Equivalent to: <code>return R{reinterpret_cast&lt;byte*&gt;(s.data()), s.size_bytes()};</code><br/>
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where <code class='backtick'>R</code> is the return type.
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</p>
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</blockquote>
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</blockquote>
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</li>
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</ol>
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‎lwg-active.html‎

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</tr>
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<tr>
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<td align="left">Date:</td>
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<td align="left">2025-04-13</td>
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<td align="left">2025-04-21</td>
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</tr>
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<tr>
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<td align="left">Project:</td>
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</tr>
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</table>
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<h1>C++ Standard Library Active Issues List (Revision D125)</h1>
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<p>Revised 2025-04-13 at 12:45:17 UTC
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<p>Revised 2025-04-21 at 09:45:59 UTC
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</p>
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<p>Reference ISO/IEC IS 14882:2020(E)</p>
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<p>Also see:</p>
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<hr>
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<h3 id="4243"><a href="#4243">4243</a><sup><a href="https://cplusplus.github.io/LWG/issue4243">(i)</a></sup>. <code class='backtick'>as_bytes</code>/<code class='backtick'>as_writable_bytes</code> is broken with <code>span&lt;volatile T&gt;</code></h3>
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<p><b>Section:</b> 23.7.2.3 <a href="https://wg21.link/span.objectrep">[span.objectrep]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Hewill Kang <b>Opened:</b> 2025-04-12 <b>Last modified:</b> 2025-04-13</p>
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<b>Submitter:</b> Hewill Kang <b>Opened:</b> 2025-04-12 <b>Last modified:</b> 2025-04-21</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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}
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</pre></blockquote>
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<p><strong>Previous resolution [SUPERSEDED]:</strong></p>
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<blockquote class="note">
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<p id="res-4243"><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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</li>
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</ol>
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</blockquote>
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<p><i>[2025-04-16; Hewill Kang provides alternative wording]</i></p>
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<p>
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Based on reflector feedback, the revised wording just improves the current state of not supporting
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support for <code class='backtick'>volatile</code>.
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</p>
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<p id="res-4243"><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 23.7.2.3 <a href="https://wg21.link/span.objectrep">[span.objectrep]</a> as indicated:</p>
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<blockquote>
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<pre>
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template&lt;class ElementType, size_t Extent&gt;
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span&lt;const byte, Extent == dynamic_extent ? dynamic_extent : sizeof(ElementType) * Extent&gt;
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as_bytes(span&lt;ElementType, Extent&gt; s) noexcept;
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</pre>
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<blockquote>
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<p>
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<ins>-?- <i>Constraints</i>: <code>is_volatile_v&lt;ElementType&gt;</code> is <code class='backtick'>false</code>.</ins>
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</p>
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<p>
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-1- <i>Effects</i>: Equivalent to: <code>return R{reinterpret_cast&lt;const byte*&gt;(s.data()), s.size_bytes()};</code><br/>
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where <code>R</code> is the return type.
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</p>
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</blockquote>
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<pre>
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template&lt;class ElementType, size_t Extent&gt;
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span&lt;byte, Extent == dynamic_extent ? dynamic_extent : sizeof(ElementType) * Extent&gt;
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as_writable_bytes(span&lt;ElementType, Extent&gt; s) noexcept;
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</pre>
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<blockquote>
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<p>
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-2- <i>Constraints</i>: <code>is_const_v&lt;ElementType&gt;</code> is <code class='backtick'>false</code> <ins>and
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<code>is_volatile_v&lt;ElementType&gt;</code> is <code class='backtick'>false</code></ins>.
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</p>
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<p>
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-3- <i>Effects</i>: Equivalent to: <code>return R{reinterpret_cast&lt;byte*&gt;(s.data()), s.size_bytes()};</code><br/>
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where <code class='backtick'>R</code> is the return type.
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</p>
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</blockquote>
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</blockquote>
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‎lwg-closed.html‎

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</tr>
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<tr>
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<td align="left">Date:</td>
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<td align="left">2025-04-13</td>
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<td align="left">2025-04-21</td>
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</table>
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<h1>C++ Standard Library Closed Issues List (Revision D125)</h1>
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<p>Revised 2025-04-13 at 12:45:17 UTC
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<p>Revised 2025-04-21 at 09:45:59 UTC
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</p>
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<p>Reference ISO/IEC IS 14882:2020(E)</p>
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<p>Also see:</p>

‎lwg-defects.html‎

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</tr>
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<tr>
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<td align="left">Date:</td>
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<td align="left">2025-04-13</td>
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<td align="left">2025-04-21</td>
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</tr>
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</tr>
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</table>
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<h1>C++ Standard Library Defect Reports and Accepted Issues (Revision D125)</h1>
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<p>Revised 2025-04-13 at 12:45:17 UTC
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<p>Revised 2025-04-21 at 09:45:59 UTC
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</p>
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<p>Reference ISO/IEC IS 14882:2020(E)</p>
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<p>Also see:</p>

‎lwg-immediate.html‎

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<td align="left">Date:</td>
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<td align="left">Revised 2025-04-13 at 12:45:17 UTC
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<td align="left">Revised 2025-04-21 at 09:45:59 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 2025-04-13 at 12:45:17 UTC
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<p>Revised 2025-04-21 at 09:45:59 UTC
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</p><h2 id="Section_3">Section 3 (2 issues)</h2>
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<p><a href="lwg-index.html#Section_3">(view all issues)</a></p>
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<table class="issues-index">

‎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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<h2>Index by Section</h2>
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<p><a href="lwg-index-open.html">(view only non-Ready open issues)</a></p>
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<p>Revised 2025-04-21 at 09:45:59 UTC
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</p><h2 id="Section_2">Section 2 (2 issues)</h2>
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‎lwg-ready.html‎

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<td align="left">Date:</td>
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<td align="left">Revised 2025-04-13 at 12:45:17 UTC
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‎lwg-status-date.html‎

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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 2025-04-21 at 09:45:59 UTC
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</p><h2 id="Ready">Ready (7 issues)</h2>
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‎lwg-status.html‎

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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>
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<p>Revised 2025-04-21 at 09:45:59 UTC
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</p><h2 id="Ready">Ready (7 issues)</h2>
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