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    CWG Issue 1920</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="1920"></A><H4>1920.
  
Qualification mismatch in <I>pseudo-destructor-name</I>
</H4>
<B>Section: </B>_N4778_.7.6.1.4&#160; [<A href="https://wg21.link/expr.pseudo">expr.pseudo</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD4
 &#160;&#160;&#160;

 <B>Submitter: </B>David Majnemer
 &#160;&#160;&#160;

 <B>Date: </B>2014-05-01<BR>


<P>[Moved to DR at the May, 2015 meeting.]</P>

<P>An example like</P>

<PRE>
  typedef int T;
  typedef const T CT;

  void blah2(T *a) {
   a-&gt;CT::~T();
  }
</PRE>

<P>is ill-formed, because _N4778_.7.6.1.4 [<A href="https://wg21.link/expr.pseudo#2">expr.pseudo</A>] paragraph 2
requires that the two <I>type-name</I>s in the <I>qualified-id</I>
be the same type.  The corresponding case for a real destructor,
however, is allowed because of the provision in 11.3 [<A href="https://wg21.link/class.name#5">class.name</A>] paragraph 5
ignoring cv-qualifiers in a <I>typedef-name</I> referring
to a class type.  The specification for pseudo-destructors should be
adjusted accordingly.</P>

<P><B>Proposed resolution (November, 2014):</B></P>

<P>Change _N4778_.7.6.1.4 [<A href="https://wg21.link/expr.pseudo#2">expr.pseudo</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

<P>...The cv-unqualified versions of the object type and of the
type designated by the <I>pseudo-destructor-name</I> shall
be the same type. Furthermore, the two <I>type-name</I>s in
a <I>pseudo-destructor-name</I> of the form</P>

<UL>
<I>nested-name-specifier<SUB>opt</SUB> type-name</I> <TT>:: ~</TT> <I>type-name</I>
</UL>

<P>shall designate the same scalar type <INS>(ignoring
cv-qualification)</INS>.</P>

</BLOCKQUOTE>

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