New issue from Jiang An: "Can the overload of std::num_get::do_get for bool call the overload for long?"

Author: Dani-Hub

xml/issue4163.xml

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+<?xml version='1.0' encoding='utf-8' standalone='no'?>
+<!DOCTYPE issue SYSTEM "lwg-issue.dtd">
+
+<issue num="4162" status="New">
+<title>Can the overload of <tt>std::num_get::do_get</tt> for <tt>bool</tt> call the overload for <tt>long</tt>?</title>
+<section><sref ref="[facet.num.get.virtuals]"/></section>
+<submitter>Jiang An</submitter>
+<date>29 Sep 2024</date>
+<priority>99</priority>
+
+<discussion>
+<p>
+<sref ref="[facet.num.get.virtuals]"/>/6 currently says:
+</p>
+<blockquote style="border-left: 3px solid #ccc;padding-left: 15px;">
+<p>
+<i>Effects</i>: If <tt>(str.flags()&amp;ios_base::boolalpha) == 0</tt> then input proceeds as it would for a 
+<tt>long</tt> except that if a value is being stored into <tt>val</tt>, [&hellip;]
+</p>
+</blockquote>
+<p>
+It is unclear whether an implementation is allowed to call the overload for <tt>long</tt> in this case. 
+Currently, libc++'s version calls that overload, while libstdc++ and MSVC STL's don't 
+(<a href="https://godbolt.org/z/83M1hKThv">example</a>).
+<p/>
+As the divergence implementation strategies is observable, perhaps we should clarify on this.
+</p>
+</discussion>
+
+<resolution>
+</resolution>
+
+</issue>