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    CWG Issue 1394</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="1394"></A><H4>1394.
  
Incomplete types as parameters of deleted functions
</H4>
<B>Section: </B>9.3.4.6&#160; [<A href="https://wg21.link/dcl.fct">dcl.fct</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD3
 &#160;&#160;&#160;

 <B>Submitter: </B>Johannes Schaub
 &#160;&#160;&#160;

 <B>Date: </B>2011-09-11<BR>


<P>[Moved to DR at the October, 2012 meeting.]</P>



<P>Currently, 9.3.4.6 [<A href="https://wg21.link/dcl.fct#9">dcl.fct</A>] paragraph 9 requires that</P>

<BLOCKQUOTE>

The type of a parameter or the return type for a function
definition shall not be an incomplete class type (possibly
cv-qualified) unless the function definition is nested within the
member-specification for that class (including definitions in
nested classes defined within the class).

</BLOCKQUOTE>

<P>There is no reason for this requirement for a function with a
deleted definition, and it would be useful to relax this prohibition
in such cases.</P>

<P><B>Proposed resolution (February, 2012):</B></P>

<P>Change 9.3.4.6 [<A href="https://wg21.link/dcl.fct#9">dcl.fct</A>] paragraph 9 as follows:</P>

<BLOCKQUOTE>

Types shall not be defined in return or parameter types.  The type of
a parameter or the return type for a function definition shall not be
an incomplete class type (possibly cv-qualified) unless the function
<INS>is deleted (9.6.3 [<A href="https://wg21.link/dcl.fct.def.delete">dcl.fct.def.delete</A>]) or the</INS> definition
is nested within the <I>member-specification</I> for that class
(including definitions in nested classes defined within the class).

</BLOCKQUOTE>

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