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‎issue4340.html‎

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<!DOCTYPE html>
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<html lang="en">
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<title>Issue 4340: task::promise_type::unhandled_stopped() should be noexcept</title>
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<meta property="og:title" content="Issue 4340: task::promise_type::unhandled_stopped() should be noexcept">
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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="4340"><a href="lwg-active.html#4340">4340</a>. <code>task::promise_type::unhandled_stopped()</code> should be <code>noexcept</code></h3>
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<p><b>Section:</b> 33.13.6.5 <a href="https://wg21.link/task.promise">[task.promise]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Dietmar Kühl <b>Opened:</b> 2025-08-31 <b>Last modified:</b> 2025-09-01</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#task.promise">active issues</a> in [task.promise].</p>
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<p><b>View all other</b> <a href="lwg-index.html#task.promise">issues</a> in [task.promise].</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 function <code>task::promise_type::unhandled_stopped()</code>
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is called from <code>set_stopped()</code> of a receiver and calls
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<code>set_stopped</code> itself. These functions are required to
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be <code>noexcept</code>. Thus, <code>unhandled_stopped()</code>
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can't throw an exception and should be marked <code>noexcept</code>.
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All other declarations of <code>unhandled_stopped()</code> are
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already marked <code>noexcept</code> but
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<code>task::promise_type::unhandled_stopped()</code> isn't.
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</p>
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<p id="res-4340"><b>Proposed resolution:</b></p>
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<p>
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In the synopsis in 33.13.6.5 <a href="https://wg21.link/task.promise">[task.promise]</a> add <code>noexcept</code>
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to the declaration of <code>task::promise_type::unhandled_stopped()</code>:
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<blockquote><pre>
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namespace std::execution {
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template&lt;class T, class Environment&gt;
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class task&lt;T, Environment&gt;::promise_type {
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...
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coroutine_handle&lt;&gt; unhandled_stopped() <ins>noexcept</ins>;
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...
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};
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}
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</pre></blockquote>
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</p>
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<p>
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In the specification in 33.13.6.5 <a href="https://wg21.link/task.promise">[task.promise]</a> paragraph 13 add <code>noexcept</code>:
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<blockquote>
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<pre>
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coroutine_handle&lt;&gt; unhandled_stopped() <ins>noexcept</ins>;
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</pre>
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<p>-13- <i>Effects</i>: Completes the asynchronous operation
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associated with <code><i>STATE</i>(*this)</code> by invoking
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<code>set_stopped(std::move(<i>RCVR</i>(*this)))</code>.</p>
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<td align="left">Date:</td>
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<td align="left">Revised 2025-09-01 at 11:54:35 UTC
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<td align="left">Revised 2025-09-01 at 17:03:34 UTC
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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 2025-09-01 at 17:03:34 UTC
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<td id="4340"><a href="lwg-active.html#4340" title="task::promise_type::unhandled_stopped() should be noexcept (Status: New)">4340</a><sup><a href="https://cplusplus.github.io/LWG/issue4340">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.13.6.5 [task.promise]</td>
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<td><code>task::promise_type::unhandled_stopped()</code> should be <code>noexcept</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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<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="4340"><a href="lwg-active.html#4340" title="task::promise_type::unhandled_stopped() should be noexcept (Status: New)">4340</a><sup><a href="https://cplusplus.github.io/LWG/issue4340">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.13.6.5 [task.promise]</td>
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<td><code>task::promise_type::unhandled_stopped()</code> should be <code>noexcept</code></td>
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<td>Yes</td>
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<td></td>
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<td id="4340"><a href="lwg-active.html#4340" title="task::promise_type::unhandled_stopped() should be noexcept (Status: New)">4340</a><sup><a href="https://cplusplus.github.io/LWG/issue4340">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.13.6.5 [task.promise]</td>
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<td><code>task::promise_type::unhandled_stopped()</code> should be <code>noexcept</code></td>
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<td>Yes</td>
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<td>33.13.6.5 [task.promise]</td>
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<td><code>task::promise_type::unhandled_stopped()</code> should be <code>noexcept</code></td>
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<td>Yes</td>
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<td id="2479"><a href="lwg-active.html#2479" title="Unclear how wbuffer_convert uses cvtstate (Status: New)">2479</a><sup><a href="https://cplusplus.github.io/LWG/issue2479">(i)</a></sup></td>
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