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    CWG Issue 2755</TITLE>
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<P><EM>This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21
  Core Issues List revision 118b.
  See http://www.open-std.org/jtc1/sc22/wg21/ for the official
  list.</EM></P>
<P>2025-09-28</P>
<HR>
<A NAME="2755"></A><H4>2755.
  
Incorrect wording applied by P2738R1
</H4>
<B>Section: </B>7.7&#160; [<A href="https://wg21.link/expr.const">expr.const</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD7
 &#160;&#160;&#160;

 <B>Submitter: </B>Jens Maurer
 &#160;&#160;&#160;

 <B>Date: </B>2023-06-28<BR>


<P>[Accepted as a DR at the November, 2023 meeting.]</P>

<P>
<A HREF="https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2023/p2738r1.pdf">P2738R1</A>
(constexpr cast from void*: towards constexpr type-erasure)
applied incorrect wording to 7.7 [<A href="https://wg21.link/expr.const#5.14">expr.const</A>] bullet 5.14:</P>

<BLOCKQUOTE>

<UL>
<LI>...</LI>
<LI>a conversion from a prvalue P of type &#8221;pointer to cv
void&#8221; to a pointer-to-object type T unless P points to an object
whose type is similar to T;
</LI>

<LI>...</LI>
</UL>

</BLOCKQUOTE>

<P>The issue is that <TT>T</TT> is defined to be a pointer type, but
the "similar to" phrasing uses it as the pointee type.</P>

<P><B>Proposed resolution (approved by CWG 2023-07-14):</B></P>

<P>Change in 7.7 [<A href="https://wg21.link/expr.const#5.14">expr.const</A>] bullet 5.14 as follows:</P>

<BLOCKQUOTE>

<UL>
<LI>...</LI>
<LI>a conversion from a prvalue P of type &#8221;pointer to cv
void&#8221; to a <DEL>pointer-to-object</DEL> type <DEL>T</DEL> <INS>"<I>cv1</I>
pointer to <TT>T</TT>", where <TT>T</TT> is
not <I>cv2</I> <TT>void</TT>,</INS> unless P points to an
object whose type is similar to T;
</LI>

<LI>...</LI>
</UL>

</BLOCKQUOTE>

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