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‎issue4259.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="4259"><a href="lwg-active.html#4259">4259</a>. P1148R0 changed the return values of searching functions of <code class='backtick'>std::basic_string</code> on some platforms</h3>
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<p><b>Section:</b> 27.4.3.8.2 <a href="https://wg21.link/string.find">[string.find]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-05-05 <b>Last modified:</b> 2025-05-18</p>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-05-05 <b>Last modified:</b> 2025-06-14</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#string.find">active issues</a> in [string.find].</p>
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Do we want to restore the old return values?
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</p>
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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Previous resolution [SUPERSEDED]: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-4259"><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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</blockquote>
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</li>
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</ol>
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</blockquote>
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<p><i>[2025-06-10, reflector discussion]</i></p>
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<p>
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During reflector discussion of this issue there was a preference to adjust the
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proposed wording to use <code class='backtick'>s.npos</code> instead of <code class='backtick'>size_t(-1)</code>.
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</p>
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<p id="res-4259"><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 27.4.3.8.2 <a href="https://wg21.link/string.find">[string.find]</a> as indicated:</p>
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<blockquote>
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<pre>
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template&lt;class T&gt;
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constexpr size_type find(const T&amp; t, size_type pos = 0) const noexcept(<i>see below</i>);
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[&hellip;]
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template&lt;class T&gt;
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constexpr size_type find_last_not_of(const T&amp; t, size_type pos = npos) const noexcept(<i>see below</i>);
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</pre>
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<blockquote>
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<p>
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-2- <i>Constraints</i>: [&hellip;]
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<p/>
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-3- <i>Effects</i>: Let <code><i>G</i></code> be the name of the function. Equivalent to:
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</p>
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<blockquote><pre>
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basic_string_view&lt;charT, traits&gt; s = *this, sv = t;
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<del>return s.<i>G</i>(sv, pos);</del>
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<ins>if (auto result = s.<i>G</i>(sv, pos); result == s.npos)
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return npos;
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else
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return result;</ins>
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</pre></blockquote>
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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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</table>
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<h1>C++ Standard Library Active Issues List (Revision D125)</h1>
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<p>Revised 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 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="4259"><a href="#4259">4259</a><sup><a href="https://cplusplus.github.io/LWG/issue4259">(i)</a></sup>. P1148R0 changed the return values of searching functions of <code class='backtick'>std::basic_string</code> on some platforms</h3>
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<p><b>Section:</b> 27.4.3.8.2 <a href="https://wg21.link/string.find">[string.find]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-05-05 <b>Last modified:</b> 2025-05-18</p>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-05-05 <b>Last modified:</b> 2025-06-14</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#string.find">active issues</a> in [string.find].</p>
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Do we want to restore the old return values?
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</p>
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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-4259"><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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</blockquote>
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</li>
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</ol>
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</blockquote>
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<p><i>[2025-06-10, reflector discussion]</i></p>
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<p>
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During reflector discussion of this issue there was a preference to adjust the
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proposed wording to use <code class='backtick'>s.npos</code> instead of <code class='backtick'>size_t(-1)</code>.
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</p>
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<p id="res-4259"><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 27.4.3.8.2 <a href="https://wg21.link/string.find">[string.find]</a> as indicated:</p>
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<blockquote>
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<pre>
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template&lt;class T&gt;
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constexpr size_type find(const T&amp; t, size_type pos = 0) const noexcept(<i>see below</i>);
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[&hellip;]
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template&lt;class T&gt;
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constexpr size_type find_last_not_of(const T&amp; t, size_type pos = npos) const noexcept(<i>see below</i>);
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</pre>
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<blockquote>
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<p>
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-2- <i>Constraints</i>: [&hellip;]
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<p/>
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-3- <i>Effects</i>: Let <code><i>G</i></code> be the name of the function. Equivalent to:
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</p>
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<blockquote><pre>
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basic_string_view&lt;charT, traits&gt; s = *this, sv = t;
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<del>return s.<i>G</i>(sv, pos);</del>
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<ins>if (auto result = s.<i>G</i>(sv, pos); result == s.npos)
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return npos;
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else
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return result;</ins>
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</pre></blockquote>
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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-closed.html‎

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</tr>
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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 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 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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</table>
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<h1>C++ Standard Library Defect Reports and Accepted Issues (Revision D125)</h1>
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<p>Revised 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 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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</tr>
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<tr>
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<td align="left">Date:</td>
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<td align="left">Revised 2025-06-14 at 09:47:03 UTC
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<td align="left">Revised 2025-06-14 at 10:02:39 UTC
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</td>
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</tr>
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<tr>

‎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 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 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 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 UTC
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</p><h2 id="Section_2">Section 2 (2 issues)</h2>
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<table class="issues-index">
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‎lwg-ready.html‎

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<tr>
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<td align="left">Date:</td>
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<td align="left">Revised 2025-06-14 at 09:47:03 UTC
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<td align="left">Revised 2025-06-14 at 10:02:39 UTC
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</td>
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<tr>

‎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>
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<p>Revised 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 UTC
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</p><h2 id="Voting">Voting (24 issues)</h2>
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<table class="issues-index">
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<tr>
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<td id="4259"><a href="lwg-active.html#4259" title="P1148R0 changed the return values of searching functions of std::basic_string on some platforms (Status: New)">4259</a><sup><a href="https://cplusplus.github.io/LWG/issue4259">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>27.4.3.8.2 [string.find]</td>
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<td>P1148R0 changed the return values of searching functions of <code class='backtick'>std::basic_string</code> on some platforms</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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<tr>
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<td id="4165"><a href="lwg-active.html#4165" title="Should swapping a built-in array or std::array with itself result in UB? (Status: New)">4165</a><sup><a href="https://cplusplus.github.io/LWG/issue4165">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>18.4.9 [concept.swappable]</td>
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<td></td>
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<td id="4259"><a href="lwg-active.html#4259" title="P1148R0 changed the return values of searching functions of std::basic_string on some platforms (Status: New)">4259</a><sup><a href="https://cplusplus.github.io/LWG/issue4259">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>27.4.3.8.2 [string.find]</td>
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<td>P1148R0 changed the return values of searching functions of <code class='backtick'>std::basic_string</code> on some platforms</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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<tr>
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<td id="4261"><a href="lwg-active.html#4261" title="P1206R7 broke uses of container adaptors with old custom sequence containers (Status: New)">4261</a><sup><a href="https://cplusplus.github.io/LWG/issue4261">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>27.4.3.8.2 [string.find]</td>

‎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 2025-06-14 at 09:47:03 UTC
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<p>Revised 2025-06-14 at 10:02:39 UTC
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</p><h2 id="Voting">Voting (24 issues)</h2>
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<table class="issues-index">
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