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‎issue3049.html‎

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<b>Submitter:</b> Jared Hoberock <b>Opened:</b> 2017-12-04 <b>Last modified:</b> 2022-04-25</p>
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<p><b>Priority: </b>3
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#algorithms.requirements">active issues</a> in [algorithms.requirements].</p>
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<p><b>View all other</b> <a href="lwg-index.html#algorithms.requirements">issues</a> in [algorithms.requirements].</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#Open">Open</a> status.</p>
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<p><b>Discussion:</b></p>

‎issue3419.html‎

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<b>Submitter:</b> Richard Smith <b>Opened:</b> 2020-03-24 <b>Last modified:</b> 2023-11-22</p>
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<p><b>Priority: </b>0
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</p>
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<p><b>View other</b> <a href="lwg-index-open.html#algorithms.requirements">active issues</a> in [algorithms.requirements].</p>
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<p><b>View all other</b> <a href="lwg-index.html#algorithms.requirements">issues</a> in [algorithms.requirements].</p>
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<p><b>View all issues with</b> <a href="lwg-status.html#C++23">C++23</a> status.</p>
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<p><b>Discussion:</b></p>

‎issue4277.html‎

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<!DOCTYPE html>
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<title>Issue 4277: &sect;[algorithms.requirements] It is unclear what an algorithm is</title>
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<meta property="og:title" content="Issue 4277: &sect;[algorithms.requirements] It is unclear what an algorithm is">
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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="4277"><a href="lwg-active.html#4277">4277</a>. &sect;[algorithms.requirements] It is unclear what an algorithm is</h3>
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<p><b>Section:</b> 26.2 <a href="https://wg21.link/algorithms.requirements">[algorithms.requirements]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jan Schultke <b>Opened:</b> 2025-06-08 <b>Last modified:</b> 2025-06-14</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#algorithms.requirements">active issues</a> in [algorithms.requirements].</p>
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<p><b>View all other</b> <a href="lwg-index.html#algorithms.requirements">issues</a> in [algorithms.requirements].</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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26.2 <a href="https://wg21.link/algorithms.requirements">[algorithms.requirements]</a> paragraph 15 states:
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</p>
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<blockquote style="border-left: 3px solid #ccc;padding-left: 15px;">
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The well-formedness and behavior of a call to an algorithm with an explicitly-specified
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template argument list is unspecified, except where explicitly stated otherwise.
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</p>
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</blockquote>
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<p>
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It is unclear what this applies to because "algorithm" is never defined. 26.2 <a href="https://wg21.link/algorithms.requirements">[algorithms.requirements]</a>
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paragraph 1 uses the term while mentioning iterators and containers, but [algorithm] specifies
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function templates such as <code class='backtick'>std::gcd</code> which do not accept iterators.
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<p/>
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The <i>Remarks</i> specifications in 26.8.9 <a href="https://wg21.link/alg.min.max">[alg.min.max]</a> providing exemptions from
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26.2 <a href="https://wg21.link/algorithms.requirements">[algorithms.requirements]</a> paragraph 15 suggest that even function templates not
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accepting iterators are considered algorithms.
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</p>
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<p id="res-4277"><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 26.2 <a href="https://wg21.link/algorithms.requirements">[algorithms.requirements]</a> as indicated:</p>
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<blockquote>
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-15- The well-formedness and behavior of a call to <del>an algorithm</del><ins>a function template specified in Clause
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26 <a href="https://wg21.link/algorithms">[algorithms]</a> (including call operators of algorithm function objects denoted as algorithms throughout Clause
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26.2 <a href="https://wg21.link/algorithms.requirements">[algorithms.requirements]</a>)</ins> with an explicitly-specified template argument list is unspecified,
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except where explicitly stated otherwise.
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<p/>
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[<i>Note 3</i>: Consequently, an implementation can declare an algorithm with different template parameters than those
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presented. &mdash; <i>end note</i>]
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‎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 2025-06-14 at 10:25:20 UTC
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<td align="left">Revised 2025-06-14 at 10:41:13 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 2025-06-14 at 10:41:13 UTC
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<td id="4277"><a href="lwg-active.html#4277" title="&sect;[algorithms.requirements] It is unclear what an algorithm is (Status: New)">4277</a><sup><a href="https://cplusplus.github.io/LWG/issue4277">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>26.2 [algorithms.requirements]<a id="algorithms.requirements"></a></td>
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<td>&sect;[algorithms.requirements] It is unclear what an algorithm is</td>
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<td>Yes</td>
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<td id="3049"><a href="lwg-active.html#3049" title="Missing wording allowing algorithms to use copies of function objects as substitutes for their parameters (Status: Open)">3049</a><sup><a href="https://cplusplus.github.io/LWG/issue3049">(i)</a></sup></td>
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<td>26.2 [algorithms.requirements]</td>
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<td>Missing wording allowing algorithms to use copies of function objects as substitutes for their parameters</td>
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<td>Yes</td>
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‎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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<p><a href="lwg-index-open.html">(view only non-Ready open issues)</a></p>
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<p>Revised 2025-06-14 at 10:41:13 UTC
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<td id="4277"><a href="lwg-active.html#4277" title="&sect;[algorithms.requirements] It is unclear what an algorithm is (Status: New)">4277</a><sup><a href="https://cplusplus.github.io/LWG/issue4277">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>26.2 [algorithms.requirements]<a id="algorithms.requirements"></a></td>
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<td>&sect;[algorithms.requirements] It is unclear what an algorithm is</td>
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<td>Yes</td>
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<td id="3049"><a href="lwg-active.html#3049" title="Missing wording allowing algorithms to use copies of function objects as substitutes for their parameters (Status: Open)">3049</a><sup><a href="https://cplusplus.github.io/LWG/issue3049">(i)</a></sup></td>
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‎lwg-ready.html‎

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