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‎issue4284.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 4284: Integer-class types should be formattable</title>
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<meta property="og:title" content="Issue 4284: Integer-class types should be formattable">
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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/issue4284.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="4284"><a href="lwg-active.html#4284">4284</a>. Integer-class types should be formattable</h3>
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<p><b>Section:</b> 28.5.6.4 <a href="https://wg21.link/format.formatter.spec">[format.formatter.spec]</a> <b>Status:</b> <a href="lwg-active.html#New">New</a>
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<b>Submitter:</b> Jiang An <b>Opened:</b> 2025-06-27 <b>Last modified:</b> 2025-06-28</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#format.formatter.spec">active issues</a> in [format.formatter.spec].</p>
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<p><b>View all other</b> <a href="lwg-index.html#format.formatter.spec">issues</a> in [format.formatter.spec].</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 following program doesn't compile with MSVC STL (<a href="https://godbolt.org/z/aazK6bhqM">Godbolt link</a>).
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</p>
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<blockquote><pre>
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#include &lt;format&gt;
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#include &lt;ranges&gt;
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int main() {
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auto iv1 = std::views::iota(42ull, 1729ull);
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auto iv2 = std::views::iota(iv1.begin(), iv1.end());
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std::format("{}", iv2.size()); // <span style="color:red;font-weight:bolder">Error</span>
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}
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</pre></blockquote>
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<p>
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In MSVC STL, the type of <code class='backtick'>iv2.size()</code> is an integer-class type, and the standard hasn't guaranteed there're
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enabled formatter specializations for integer-class types. As a result, this program is not guaranteed to
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be well-formed.
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<p/>
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Perhaps we should require enabled <code class='backtick'>std::formatter</code> specializations for integer-class types to get rid of
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such uncertainty and inconsistency.
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</p>
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<p id="res-4284"><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 28.5.6.4 <a href="https://wg21.link/format.formatter.spec">[format.formatter.spec]</a> as indicated:</p>
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<blockquote>
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<p>
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-2- [&hellip;] Each header that declares the template
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<code class='backtick'>formatter</code> provides the following enabled specializations:
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</p>
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<ol style="list-style-type: none">
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<li><p>(2.1) &mdash; [&hellip;]</p></li>
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<li><p>(2.2) &mdash; [&hellip;]</p></li>
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<li><p>(2.3) &mdash; [&hellip;]</p></li>
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<li><p><ins>(2.?) &mdash; For each <code class='backtick'>charT</code>, for each cv-unqualified integer-class type
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(24.3.4.4 <a href="https://wg21.link/iterator.concept.winc">[iterator.concept.winc]</a>) <code class='backtick'>IntegerClass</code>, a specialization</ins>
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</p>
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<blockquote><pre>
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<ins>template&lt;&gt; struct formatter&lt;IntegerClass, charT&gt;;</ins>
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</pre></blockquote>
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</li>
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<li><p>(2.4) &mdash; [&hellip;]</p></li>
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</ol>
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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 2025-06-28 at 14:45:47 UTC
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<td align="left">Revised 2025-06-28 at 17:28:20 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 2025-06-28 at 17:28:20 UTC
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<td id="4146"><a href="lwg-active.html#4146" title="&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors (Status: New)">4146</a><sup><a href="https://cplusplus.github.io/LWG/issue4146">(i)</a></sup></td>
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<td id="4284"><a href="lwg-active.html#4284" title="Integer-class types should be formattable (Status: New)">4284</a><sup><a href="https://cplusplus.github.io/LWG/issue4284">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>28.5.6.4 [format.formatter.spec]<a id="format.formatter.spec"></a></td>
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<td>Integer-class types should be formattable</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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<tr>
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<td id="4146"><a href="lwg-active.html#4146" title="&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors (Status: New)">4146</a><sup><a href="https://cplusplus.github.io/LWG/issue4146">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>28.5.6.4 [format.formatter.spec]</td>
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<td>&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors</td>
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<td>Yes</td>
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<td></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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<p>Revised 2025-06-28 at 14:45:47 UTC
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<p>Revised 2025-06-28 at 17:28:20 UTC
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<td id="4146"><a href="lwg-active.html#4146" title="&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors (Status: New)">4146</a><sup><a href="https://cplusplus.github.io/LWG/issue4146">(i)</a></sup></td>
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<td id="4284"><a href="lwg-active.html#4284" title="Integer-class types should be formattable (Status: New)">4284</a><sup><a href="https://cplusplus.github.io/LWG/issue4284">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>28.5.6.4 [format.formatter.spec]<a id="format.formatter.spec"></a></td>
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<td>Integer-class types should be formattable</td>
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<td>Yes</td>
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<td></td>
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<td></td>
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<td id="4146"><a href="lwg-active.html#4146" title="&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors (Status: New)">4146</a><sup><a href="https://cplusplus.github.io/LWG/issue4146">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>28.5.6.4 [format.formatter.spec]</td>
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<td>&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors</td>
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‎lwg-ready.html‎

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<td id="4284"><a href="lwg-active.html#4284" title="Integer-class types should be formattable (Status: New)">4284</a><sup><a href="https://cplusplus.github.io/LWG/issue4284">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>28.5.6.4 [format.formatter.spec]</td>
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<td>Integer-class types should be formattable</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="4281"><a href="lwg-active.html#4281" title="Inconsistency between value_or() and error_or() in std::expected (Status: New)">4281</a><sup><a href="https://cplusplus.github.io/LWG/issue4281">(i)</a></sup></td>
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<td>22.5.3.7 [optional.observe]</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="4284"><a href="lwg-active.html#4284" title="Integer-class types should be formattable (Status: New)">4284</a><sup><a href="https://cplusplus.github.io/LWG/issue4284">(i)</a></sup></td>
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<td><a href="lwg-active.html#New">New</a></td>
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<td>28.5.6.4 [format.formatter.spec]</td>
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<td>Integer-class types should be formattable</td>
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<td>Yes</td>
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<td id="4146"><a href="lwg-active.html#4146" title="&sect;[format.formatter.spec]/3 unconditionally enables nonlocking for container adaptors (Status: New)">4146</a><sup><a href="https://cplusplus.github.io/LWG/issue4146">(i)</a></sup></td>
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<td>28.5.6.4 [format.formatter.spec]</td>

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