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‎issue4260.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 4260: Query objects must be default constructible</title>
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<meta property="og:title" content="Issue 4260: Query objects must be default constructible">
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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="4260"><a href="lwg-active.html#4260">4260</a>. Query objects must be default constructible</h3>
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<p><b>Section:</b> 33.2.1 <a href="https://wg21.link/exec.queryable.general">[exec.queryable.general]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Eric Niebler <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 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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Imported from <a href="https://github.com/cplusplus/sender-receiver/issues/333">cplusplus/sender-receiver #333</a>.
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<p/>
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We require the types of query objects such as <code class='backtick'>get_scheduler</code> to be customization point objects.
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16.3.3.3.5 <a href="https://wg21.link/customization.point.object">[customization.point.object]</a> requires them to be <code class='backtick'>semiregular</code> but that concept
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does not require default constructability. Much of <code class='backtick'>std::execution</code> assumes query object types
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to be default constructible.
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<p/>
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I propose adding a (nothrow) default-constructibility requirement.
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</p>
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<p id="res-4260"><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 33.2.1 <a href="https://wg21.link/exec.queryable.general">[exec.queryable.general]</a> as indicated:</p>
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<blockquote>
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<p>
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-1- A <i>queryable object</i> is a read-only collection of key/value pair where each key is a
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customization point object known as a <i>query object</i>.
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<ins>The type of a query object satisfies <code class='backtick'>default_initializable</code>, and its default constructor
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is not potentially throwing.</ins>
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A <i>query</i> is an invocation of a query object with a queryable object as its first
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argument and a (possibly empty) set of additional arguments.
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A query imposes syntactic and semantic requirements on its invocations.
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</p>
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</blockquote>
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</li>
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</ol>
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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-immediate.html‎

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<td align="left">Date:</td>
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<td align="left">Revised 2025-05-18 at 09:36:53 UTC
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<td align="left">Revised 2025-05-18 at 09:48:56 UTC
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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 2025-05-18 at 09:36:53 UTC
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<p>Revised 2025-05-18 at 09:48:56 UTC
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</p><h2 id="Section_3">Section 3 (2 issues)</h2>
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<td id="4260"><a href="lwg-active.html#4260" title="Query objects must be default constructible (Status: New)">4260</a><sup><a href="https://cplusplus.github.io/LWG/issue4260">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.2.1 [exec.queryable.general]<a id="exec.queryable.general"></a></td>
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<td>Query objects must be default constructible</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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<td id="4143"><a href="lwg-active.html#4143" title="execution::set_value/set_error/set_stopped/start should always return void (Status: New)">4143</a><sup><a href="https://cplusplus.github.io/LWG/issue4143">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.7.2 [exec.set.value]<a id="exec.set.value"></a></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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<h2>Index by Section</h2>
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<p>Revised 2025-05-18 at 09:48:56 UTC
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<td id="4260"><a href="lwg-active.html#4260" title="Query objects must be default constructible (Status: New)">4260</a><sup><a href="https://cplusplus.github.io/LWG/issue4260">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.2.1 [exec.queryable.general]<a id="exec.queryable.general"></a></td>
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<td>Query objects must be default constructible</td>
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<td>Yes</td>
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<td id="4175"><a href="lwg-defects.html#4175" title="get_env() specified in terms of as_const() but this doesn't work with rvalue senders (Status: WP)">4175</a><sup><a href="https://cplusplus.github.io/LWG/issue4175">(i)</a></sup></td>
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<td>33.5.2 [exec.get.allocator]<a id="exec.get.allocator"></a></td>

‎lwg-ready.html‎

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<td align="left">Date:</td>
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<td align="left">Revised 2025-05-18 at 09:36:53 UTC
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‎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>Revised 2025-05-18 at 09:36:53 UTC
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<p>Revised 2025-05-18 at 09:48:56 UTC
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</p><h2 id="Ready">Ready (7 issues)</h2>
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<td id="4260"><a href="lwg-active.html#4260" title="Query objects must be default constructible (Status: New)">4260</a><sup><a href="https://cplusplus.github.io/LWG/issue4260">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>33.2.1 [exec.queryable.general]</td>
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<td>Yes</td>
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<td id="4257"><a href="lwg-active.html#4257" title="Stream insertion for chrono::local_time should be constrained (Status: New)">4257</a><sup><a href="https://cplusplus.github.io/LWG/issue4257">(i)</a></sup></td>
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‎lwg-status.html‎

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</p><h2 id="Ready">Ready (7 issues)</h2>
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<td id="4260"><a href="lwg-active.html#4260" title="Query objects must be default constructible (Status: New)">4260</a><sup><a href="https://cplusplus.github.io/LWG/issue4260">(i)</a></sup></td>
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<td>33.2.1 [exec.queryable.general]</td>
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<td id="4143"><a href="lwg-active.html#4143" title="execution::set_value/set_error/set_stopped/start should always return void (Status: New)">4143</a><sup><a href="https://cplusplus.github.io/LWG/issue4143">(i)</a></sup></td>
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<td>33.7.2 [exec.set.value]</td>

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