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    CWG Issue 1811</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="1811"></A><H4>1811.
  
Lookup of deallocation function in a virtual destructor definition
</H4>
<B>Section: </B>11.4.7&#160; [<A href="https://wg21.link/class.dtor">class.dtor</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Richard Smith
 &#160;&#160;&#160;

 <B>Date: </B>2013-11-18<BR>


<P>[Moved to DR at the November, 2014 meeting.]</P>



<P>According to 11.4.7 [<A href="https://wg21.link/class.dtor#12">class.dtor</A>] paragraph 12,</P>

<BLOCKQUOTE>

At the point of definition of a virtual destructor
(including an implicit definition
(11.4.5.3 [<A href="https://wg21.link/class.copy.ctor">class.copy.ctor</A>])), the non-array deallocation
function is looked up in the scope of the destructor's class
(6.5.2 [<A href="https://wg21.link/class.member.lookup">class.member.lookup</A>]), and, if no declaration is
found, the function is looked up in the global scope. If the
result of this lookup is ambiguous or inaccessible, or if
the lookup selects a placement deallocation function or a
function with a deleted definition
(9.6 [<A href="https://wg21.link/dcl.fct.def">dcl.fct.def</A>]), the program is
ill-formed. [<I>Note:</I> This assures that a deallocation
function corresponding to the dynamic type of an object is
available for the <I>delete-expression</I>
(11.4.11 [<A href="https://wg21.link/class.free">class.free</A>]). &#8212;<I>end note</I>]

</BLOCKQUOTE>

<P>This specification is not sufficiently clear regarding the
nature of the lookup.  Presumably the intent is that the
processing be parallel to that described in 7.6.2.9 [<A href="https://wg21.link/expr.delete">expr.delete</A>],
but that should be made explicit.</P>

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

<P>Change 11.4.7 [<A href="https://wg21.link/class.dtor#12">class.dtor</A>] paragraph 12 as follows:</P>

<BLOCKQUOTE>

At the point of definition of a virtual destructor (including an implicit
definition (11.4.5.3 [<A href="https://wg21.link/class.copy.ctor">class.copy.ctor</A>])), the non-array deallocation
function is <DEL>looked up in the scope of the destructor's class
(6.5.2 [<A href="https://wg21.link/class.member.lookup">class.member.lookup</A>]), and, if no declaration is found, the function
is looked up in the global scope</DEL> <INS>determined as if for the
expression <TT>delete this</TT> appearing in a non-virtual destructor of
the destructor's class (see 7.6.2.9 [<A href="https://wg21.link/expr.delete">expr.delete</A>])</INS>. If
the <DEL>result of this lookup is ambiguous or
inaccessible,</DEL> <INS>lookup fails</INS> or if the <DEL>lookup selects a
placement deallocation function or a function with</DEL> <INS>deallocation
function has</INS> a deleted definition (9.6 [<A href="https://wg21.link/dcl.fct.def">dcl.fct.def</A>]), the
program is ill-formed. [<I>Note:</I> This assures that a deallocation
function corresponding to the dynamic type of an object is available for
the <I>delete-expression</I> (11.4.11 [<A href="https://wg21.link/class.free">class.free</A>]). &#8212;<I>end
note</I>]

</BLOCKQUOTE>

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