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    CWG Issue 2015</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="2015"></A><H4>2015.
  
odr-use of deleted virtual functions
</H4>
<B>Section: </B>9.6.3&#160; [<A href="https://wg21.link/dcl.fct.def.delete">dcl.fct.def.delete</A>]
 &#160;&#160;&#160;

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

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

 <B>Date: </B>2014-10-05<BR>


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

<P>It is not clear that the odr-use of a virtual function described in
6.3 [<A href="https://wg21.link/basic.def.odr#3">basic.def.odr</A>] paragraph 3 is exempt from the prohibition
against referring to a deleted function (9.6.3 [<A href="https://wg21.link/dcl.fct.def.delete#2">dcl.fct.def.delete</A>] paragraph 2)
.</P>

<P><B>Proposed resolution (May, 2015):</B></P>

<P>Change 9.6.3 [<A href="https://wg21.link/dcl.fct.def.delete#2">dcl.fct.def.delete</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

A program that refers to a deleted function implicitly or
explicitly, other than to declare it, is ill-formed.
[<I>Note:</I> This includes calling the function implicitly
or explicitly and forming a pointer or pointer-to-member to
the function. It applies even for references in expressions
that are not potentially-evaluated. If a function is
overloaded, it is referenced only if the function is
selected by overload resolution. <INS>The implicit odr-use
(6.3 [<A href="https://wg21.link/basic.def.odr">basic.def.odr</A>]) of a virtual function does not, by
itself, constitute a reference.</INS> &#8212;<I>end note</I>]

</BLOCKQUOTE>

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