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‎issue4259.html‎

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@@ -67,6 +67,8 @@ <h3 id="4259"><a href="lwg-active.html#4259">4259</a>. P1148R0 changed the retur
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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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<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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<p><b>View all other</b> <a href="lwg-index.html#string.find">issues</a> in [string.find].</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>

‎issue4261.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Issue 4261: P1206R7 broke uses of container adaptors with old custom sequence containers</title>
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<meta property="og:title" content="Issue 4261: P1206R7 broke uses of container adaptors with old custom sequence containers">
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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="4261"><a href="lwg-active.html#4261">4261</a>. P1206R7 broke uses of container adaptors with old custom sequence containers</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> 2025-05-07 <b>Last modified:</b> 2025-05-18</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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<p><b>View all other</b> <a href="lwg-index.html#string.find">issues</a> in [string.find].</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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<a href="https://wg21.link/P1206R7" title=" Conversions from ranges to containers">P1206R7</a> added some requirements for sequence containers, including program-defined ones.
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<p/>
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These requirements mean that if a custom C++20 sequence container type has no newly required member
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functions added in C++23 mode, it is no longer a sequence container, and uses of it with
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<code class='backtick'>std::stack</code>, <code class='backtick'>std::queue</code>, or <code class='backtick'>std::priority_queue</code> possibly have undefined behavior or
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make the program ill-formed. Additionally, some users want to use C++23 flat container adaptors
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with old sequence containers (<a href="https://github.com/llvm/llvm-project/issues/136656">llvm/llvm-project#136656</a>),
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it is unclear whether such uses are intentionally rejected.
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<p/>
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Perhaps the requirements on <code class='backtick'>from_range_t</code> constructor, <code class='backtick'>insert_range</code> and <code class='backtick'>assign_range</code> should be made optional,
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although these operations should have specified semantics whenever being well-formed in immediate contexts.
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</p>
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<p id="res-4261"><b>Proposed resolution:</b></p>
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</body>
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</html>

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