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‎issue4278.html‎

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<!DOCTYPE html>
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<html lang="en">
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<title>Issue 4278: Consider changing how get-domain-early(sndr) works</title>
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<meta property="og:title" content="Issue 4278: Consider changing how get-domain-early(sndr) works">
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<meta property="og:description" content="C++ library issue. Status: New">
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<meta property="og:url" content="https://cplusplus.github.io/LWG/issue4278.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="4278"><a href="lwg-active.html#4278">4278</a>. Consider changing how <code><i>get-domain-early</i>(sndr)</code> works</h3>
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<p><b>Section:</b> 33.9.2 <a href="https://wg21.link/exec.snd.expos">[exec.snd.expos]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jonathan Wakely <b>Opened:</b> 2025-06-16 <b>Last modified:</b> 2025-06-21</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#exec.snd.expos">active issues</a> in [exec.snd.expos].</p>
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<p><b>View all other</b> <a href="lwg-index.html#exec.snd.expos">issues</a> in [exec.snd.expos].</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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During LWG review of <a href="https://wg21.link/P3481R3">P3481R3</a> it was noted that we need to say "except that <code class='backtick'>sndr</code>
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is only evaluated once" because it's used in <code><i>get-domain-early</i>(sndr)</code>, but that
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exposition-only-function doesn't actually use its argument, it only cares about the type, and
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it default constructs a <code class='backtick'>Domain</code> of a type determined by using the type of <code class='backtick'>sndr</code>.
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<p/>
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If we had something like:
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</p>
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<blockquote><pre>
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template&lt;class Sender&gt;
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using <i>get-domain-early-t</i> = decltype(<i>get-domain-early</i>(declval&lt;const Sender&amp;&gt;()));
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</pre></blockquote>
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<p>
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then we wouldn't need to use <code class='backtick'>sndr</code> twice in expressions that currently use <code><i>get-domain-early</i>(sndr)</code>.
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</p>
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<p id="res-4278"><b>Proposed resolution:</b></p>
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</body>
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</html>

‎lwg-active.html‎

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‎lwg-closed.html‎

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‎lwg-defects.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 2025-06-17 at 12:13:10 UTC
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<td align="left">Revised 2025-06-21 at 12:46:02 UTC
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</td>
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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 2025-06-17 at 12:13:10 UTC
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<p>Revised 2025-06-21 at 12:46:02 UTC
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</p><h2 id="Section_3">Section 3 (2 issues)</h2>
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<h2 id="Section_33">Section 33 (8 issues)</h2>
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<td id="4248"><a href="lwg-active.html#4248" title="Late domain-based dispatching of schedule_from and continues_on are flipped (Status: New)">4248</a><sup><a href="https://cplusplus.github.io/LWG/issue4248">(i)</a></sup></td>
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<td id="4278"><a href="lwg-active.html#4278" title="Consider changing how get-domain-early(sndr) works (Status: New)">4278</a><sup><a href="https://cplusplus.github.io/LWG/issue4278">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.9.2 [exec.snd.expos]<a id="exec.snd.expos"></a></td>
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<td>Consider changing how <code><i>get-domain-early</i>(sndr)</code> works</td>
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<td><span class="no-pr">No</span></td>
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<td id="4248"><a href="lwg-active.html#4248" title="Late domain-based dispatching of schedule_from and continues_on are flipped (Status: New)">4248</a><sup><a href="https://cplusplus.github.io/LWG/issue4248">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.9.2 [exec.snd.expos]</td>
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<td>Late domain-based dispatching of <code class='backtick'>schedule_from</code> and <code class='backtick'>continues_on</code> are flipped</td>
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<td>Yes</td>
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<td>1</td>

‎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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<td id="4248"><a href="lwg-active.html#4248" title="Late domain-based dispatching of schedule_from and continues_on are flipped (Status: New)">4248</a><sup><a href="https://cplusplus.github.io/LWG/issue4248">(i)</a></sup></td>
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<td id="4278"><a href="lwg-active.html#4278" title="Consider changing how get-domain-early(sndr) works (Status: New)">4278</a><sup><a href="https://cplusplus.github.io/LWG/issue4278">(i)</a></sup></td>
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<td>Consider changing how <code><i>get-domain-early</i>(sndr)</code> works</td>
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<td><span class="no-pr">No</span></td>
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<td id="4248"><a href="lwg-active.html#4248" title="Late domain-based dispatching of schedule_from and continues_on are flipped (Status: New)">4248</a><sup><a href="https://cplusplus.github.io/LWG/issue4248">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.9.2 [exec.snd.expos]</td>
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<td>Late domain-based dispatching of <code class='backtick'>schedule_from</code> and <code class='backtick'>continues_on</code> are flipped</td>
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<td>Yes</td>
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<td>1</td>

‎lwg-ready.html‎

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<td align="left">Date:</td>
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<td align="left">Revised 2025-06-17 at 12:13:10 UTC
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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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<td id="4278"><a href="lwg-active.html#4278" title="Consider changing how get-domain-early(sndr) works (Status: New)">4278</a><sup><a href="https://cplusplus.github.io/LWG/issue4278">(i)</a></sup></td>
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<td>33.9.2 [exec.snd.expos]</td>
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<td>Consider changing how <code><i>get-domain-early</i>(sndr)</code> works</td>
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<td><span class="no-pr">No</span></td>
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<td id="3696"><a href="lwg-active.html#3696" title="&quot;Basic integral types&quot; should not be used (Status: New)">3696</a><sup><a href="https://cplusplus.github.io/LWG/issue3696">(i)</a></sup></td>
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<td>31.2.2 [stream.types]</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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<td id="4278"><a href="lwg-active.html#4278" title="Consider changing how get-domain-early(sndr) works (Status: New)">4278</a><sup><a href="https://cplusplus.github.io/LWG/issue4278">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.9.2 [exec.snd.expos]</td>
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<td>Consider changing how <code><i>get-domain-early</i>(sndr)</code> works</td>
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<td><span class="no-pr">No</span></td>
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<td>33.9.2 [exec.snd.expos]</td>

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