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‎issue4225.html‎

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<!DOCTYPE html>
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<title>Issue 4225: What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list?</title>
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<meta property="og:title" content="Issue 4225: What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list?">
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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="4225"><a href="lwg-active.html#4225">4225</a>. What should happen when an exception is thrown on resizing <code class='backtick'>std::deque</code>, <code class='backtick'>std::forward_list</code>, or <code class='backtick'>std::list</code>?</h3>
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<p><b>Section:</b> 23.3.5.3 <a href="https://wg21.link/deque.capacity">[deque.capacity]</a>, 23.3.7.5 <a href="https://wg21.link/forward.list.modifiers">[forward.list.modifiers]</a>, 23.3.9.3 <a href="https://wg21.link/list.capacity">[list.capacity]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-03-15 <b>Last modified:</b> 2025-03-15</p>
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<p><b>Priority: </b>Not Prioritized
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</p>
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<p><b>View all other</b> <a href="lwg-index.html#deque.capacity">issues</a> in [deque.capacity].</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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Currently, <code class='backtick'>std::vector</code> and <code class='backtick'>std::inplace_vector</code>'s <code class='backtick'>resize</code> functions are specified to have no effects
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on the container when an exception is throwing on appending. However, such specification seem to be missing
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for <code class='backtick'>std::deque</code>, <code class='backtick'>std::forward_list</code>, and <code class='backtick'>std::list</code>.
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<p/>
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Is such difference intented? Do we want to roll back the status of container when the appending is partially done?
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<p/>
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<b>Daniel:</b>
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<p/>
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The specific <code class='backtick'>resize</code> exception guarantee for <code class='backtick'>std::vector</code> came from resolving LWG <a href="lwg-defects.html#2033" title="Preconditions of reserve, shrink_to_fit, and resize functions (Status: C++14)">2033</a><sup><a href="https://cplusplus.github.io/LWG/issue2033" title="Latest snapshot">(i)</a></sup> and were
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later effectively copied to <code class='backtick'>std::inplace_vector</code> because that container's specification should resemble
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as much as possible that of <code class='backtick'>std::vector</code>.
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</p>
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<p id="res-4225"><b>Proposed resolution:</b></p>
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</body>
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</html>

‎lwg-active.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 2025-03-15 at 16:11:02 UTC
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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 2025-03-15 at 16:34:53 UTC
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</p><h2 id="Section_3">Section 3 (2 issues)</h2>
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<td id="4225"><a href="lwg-active.html#4225" title="What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list? (Status: New)">4225</a><sup><a href="https://cplusplus.github.io/LWG/issue4225">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>23.3.5.3 [deque.capacity]<a id="deque.capacity"></a></td>
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<td>What should happen when an exception is thrown on resizing <code class='backtick'>std::deque</code>, <code class='backtick'>std::forward_list</code>, or <code class='backtick'>std::list</code>?</td>
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<td><span class="no-pr">No</span></td>
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<td id="4123"><a href="lwg-active.html#4123" title="Container effects use &quot;the assignment operator or move assignment operator&quot; (Status: New)">4123</a><sup><a href="https://cplusplus.github.io/LWG/issue4123">(i)</a></sup></td>
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<td>23.3.5.4 [deque.modifiers]<a id="deque.modifiers"></a></td>

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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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<td id="4225"><a href="lwg-active.html#4225" title="What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list? (Status: New)">4225</a><sup><a href="https://cplusplus.github.io/LWG/issue4225">(i)</a></sup></td>
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<td>23.3.5.3 [deque.capacity]<a id="deque.capacity"></a></td>
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<td>What should happen when an exception is thrown on resizing <code class='backtick'>std::deque</code>, <code class='backtick'>std::forward_list</code>, or <code class='backtick'>std::list</code>?</td>
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<td><span class="no-pr">No</span></td>
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<td><a href="lwg-active.html#C++11">C++11</a></td>
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<td>23.3.5.3 [deque.capacity]</td>
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<td>Effects of <code>resize(size())</code> on a <code>deque</code></td>
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<td align="left">Date:</td>
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<td id="4225"><a href="lwg-active.html#4225" title="What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list? (Status: New)">4225</a><sup><a href="https://cplusplus.github.io/LWG/issue4225">(i)</a></sup></td>
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<td>23.3.5.3 [deque.capacity]</td>
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<td>What should happen when an exception is thrown on resizing <code class='backtick'>std::deque</code>, <code class='backtick'>std::forward_list</code>, or <code class='backtick'>std::list</code>?</td>
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<td><span class="no-pr">No</span></td>
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<td id="4223"><a href="lwg-active.html#4223" title="Deduction guides for maps are mishandling tuples and references (Status: New)">4223</a><sup><a href="https://cplusplus.github.io/LWG/issue4223">(i)</a></sup></td>
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<td>23.4.1 [associative.general]</td>

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<td id="4225"><a href="lwg-active.html#4225" title="What should happen when an exception is thrown on resizing std::deque, std::forward_list, or std::list? (Status: New)">4225</a><sup><a href="https://cplusplus.github.io/LWG/issue4225">(i)</a></sup></td>
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<td>23.3.5.3 [deque.capacity]</td>
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<td>What should happen when an exception is thrown on resizing <code class='backtick'>std::deque</code>, <code class='backtick'>std::forward_list</code>, or <code class='backtick'>std::list</code>?</td>
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<td><span class="no-pr">No</span></td>
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<td>23.3.5.4 [deque.modifiers]</td>

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