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‎issue4150.html‎

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<meta charset="utf-8">
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<title>Issue 4150: The preconditions on run_loop::run() are too strict</title>
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<meta property="og:title" content="Issue 4150: The preconditions on run_loop::run() are too strict">
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<meta property="og:description" content="C++ library issue. Status: New">
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<meta property="og:description" content="C++ library issue. Status: Resolved">
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<meta property="og:url" content="https://cplusplus.github.io/LWG/issue4150.html">
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<meta property="og:type" content="website">
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<meta property="og:image" content="http://cplusplus.github.io/LWG/images/cpp_logo.png">
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</head>
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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="4150"><a href="lwg-active.html#4150">4150</a>. The preconditions on <code>run_loop::run()</code> are too strict</h3>
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<p><b>Section:</b> 33.12.1.4 <a href="https://wg21.link/exec.run.loop.members">[exec.run.loop.members]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Eric Niebler <b>Opened:</b> 2024-09-05 <b>Last modified:</b> 2024-09-06</p>
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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#Resolved">Resolved</a> status.</em></p>
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<h3 id="4150"><a href="lwg-defects.html#4150">4150</a>. The preconditions on <code>run_loop::run()</code> are too strict</h3>
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<p><b>Section:</b> 33.12.1.4 <a href="https://wg21.link/exec.run.loop.members">[exec.run.loop.members]</a> <b>Status:</b> <a href="lwg-active.html#Resolved">Resolved</a>
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<b>Submitter:</b> Eric Niebler <b>Opened:</b> 2024-09-05 <b>Last modified:</b> 2025-02-07</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>View all issues with</b> <a href="lwg-status.html#Resolved">Resolved</a> status.</p>
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<p><b>Discussion:</b></p>
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<p>
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From <a href="https://github.com/cplusplus/sender-receiver/issues/280">sender-receiver/issues #280</a>:
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If <code>sndr</code> completes synchronously, the <code>sync_wait_receiver</code> will call <code>finish()</code>
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on the loop before <code>loop.run()</code> is called, violating <code>run</code>'s precondition.
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</p>
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<p><i>[2025-02-07 Status changed: New &rarr; Resolved.]</i></p>
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<p>Resolved by <a href="https://wg21.link/P3396R1">P3396R1</a>.</p>
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<p id="res-4150"><b>Proposed resolution:</b></p>

‎issue4152.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="4152"><a href="lwg-active.html#4152">4152</a>. The primary template of <code>std::char_traits</code> is totally underspecified</h3>
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<p><b>Section:</b> 27.2.2 <a href="https://wg21.link/char.traits.require">[char.traits.require]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2024-09-08 <b>Last modified:</b> 2024-09-08</p>
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<p><b>Priority: </b>Not Prioritized
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2024-09-08 <b>Last modified:</b> 2025-02-07</p>
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<p><b>Priority: </b>4
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#char.traits.require">active issues</a> in [char.traits.require].</p>
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<p><b>View all other</b> <a href="lwg-index.html#char.traits.require">issues</a> in [char.traits.require].</p>
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since C++20.
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</p>
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<p><i>[2025-02-07; Reflector poll]</i></p>
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<p>
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Set priority to 4 after reflector poll.
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</p>
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<p>
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27.2.1 <a href="https://wg21.link/char.traits.general">[char.traits.general]</a>/1 says that the subclause
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"defines a class template <code>char_traits&lt;charT&gt;</code>",
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but we never provided a definition.
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</p>
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<p>
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"Libc++ started to warn that the primary template is deprecated and will
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be removed. The proposed resolution doesn't improve matters though."
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</p>
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<p>
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"The definition should be cross-platform. Unspecified doesn't help."
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</p>
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<p id="res-4152"><b>Proposed resolution:</b></p>
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<p>

‎issue4156.html‎

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<meta charset="utf-8">
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<title>Issue 4156: error_category messages have unspecified encoding</title>
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<meta property="og:title" content="Issue 4156: error_category messages have unspecified encoding">
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<meta property="og:description" content="C++ library issue. Status: New">
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<meta property="og:description" content="C++ library issue. Status: SG16">
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<meta property="og:url" content="https://cplusplus.github.io/LWG/issue4156.html">
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</head>
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<body>
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<hr>
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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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<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#SG16">SG16</a> status.</em></p>
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<h3 id="4156"><a href="lwg-active.html#4156">4156</a>. <code>error_category</code> messages have unspecified encoding</h3>
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<p><b>Section:</b> 19.5.3.2 <a href="https://wg21.link/syserr.errcat.virtuals">[syserr.errcat.virtuals]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Victor Zverovich <b>Opened:</b> 2024-09-18 <b>Last modified:</b> 2024-09-18</p>
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<p><b>Priority: </b>Not Prioritized
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<p><b>Section:</b> 19.5.3.2 <a href="https://wg21.link/syserr.errcat.virtuals">[syserr.errcat.virtuals]</a> <b>Status:</b> <a href="lwg-active.html#SG16">SG16</a>
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<b>Submitter:</b> Victor Zverovich <b>Opened:</b> 2024-09-18 <b>Last modified:</b> 2025-02-07</p>
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<p><b>Priority: </b>3
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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>View all issues with</b> <a href="lwg-status.html#SG16">SG16</a> status.</p>
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<p><b>Discussion:</b></p>
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19.5.3.1 <a href="https://wg21.link/syserr.errcat.overview">[syserr.errcat.overview]</a> says:
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<p><i>[2025-02-07; Reflector poll]</i></p>
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Set priority to 3 after reflector poll.
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</p>
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<p>
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"Do we need to say something about <code class='backtick'>name()</code> too? Does this requirement apply
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to user overrides? If it does, what's the consequence of a violation? UB?
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This 'encoding for strings returned by the library' questions feels like it
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should be comprehensively addressed in a paper rather than as a patchwork of
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individual issues."
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</p>
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<p id="res-4156"><b>Proposed resolution:</b></p>
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<p>

‎issue4161.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="4161"><a href="lwg-active.html#4161">4161</a>. Some free functions don't automatically work for program-defined <code>std::complex&lt;<i>NonFloatingPoint</i>&gt;</code></h3>
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<p><b>Section:</b> 29.4 <a href="https://wg21.link/complex.numbers">[complex.numbers]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2024-09-29 <b>Last modified:</b> 2024-10-03</p>
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<p><b>Priority: </b>Not Prioritized
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2024-09-29 <b>Last modified:</b> 2025-02-07</p>
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<p><b>Priority: </b>3
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</p>
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<p><b>View all other</b> <a href="lwg-index.html#complex.numbers">issues</a> in [complex.numbers].</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><i>[2025-02-07; Reflector poll]</i></p>
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Set priority to 3 after reflector poll.
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</p>
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<p>
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"Program-defined specializations of <code class='backtick'>std::complex</code>
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(i.e. explicit specializations and program-defined partial specializations)
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seem unsupportably broken. We should say so explicitly until somebody writes
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a paper to fix them."
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</p>
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<p id="res-4161"><b>Proposed resolution:</b></p>
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