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    CWG Issue 2431</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="2431"></A><H4>2431.
  
Full-expressions and temporaries bound to references
</H4>
<B>Section: </B>6.10&#160; [<A href="https://wg21.link/basic.exec">basic.exec</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++20
 &#160;&#160;&#160;

 <B>Submitter: </B>Andrey Erokhin
 &#160;&#160;&#160;

 <B>Date: </B>2019-02-07<BR>


<P>[Adopted as a DR at the November, 2019 meeting.]</P>

<P>According to 6.10 [<A href="https://wg21.link/basic.exec#5">basic.exec</A>] paragraph 5,</P>

<BLOCKQUOTE>

<P>A <I>full-expression</I> is</P>

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

<LI><P>an invocation of a destructor generated at the end of
the lifetime of an object other than a temporary object
(6.8.7 [<A href="https://wg21.link/class.temporary">class.temporary</A>]), or</P></LI>

<LI><P>...</P></LI>

</UL>

</BLOCKQUOTE>

<P>This definition excludes the destruction of temporaries
that are bound to references from being treated as
full-expressions. It is not clear whether this omission has
observable effects or not. See
<A HREF="https://github.com/cplusplus/draft/issues/2664">
editorial issue 2664</A>.</P>

<P><B>Proposed resolution (October, 2019):</B></P>

<P>Change 6.10 [<A href="https://wg21.link/basic.exec#5.5">basic.exec</A>] bullet 5.5 as follows:</P>

<BLOCKQUOTE>


<P>A <I>full-expression</I> is</P>

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

<LI><P>an invocation of a destructor generated at the end of the
lifetime of an object other than a temporary object
(6.8.7 [<A href="https://wg21.link/class.temporary">class.temporary</A>]) <INS>whose lifetime has not been
extended</INS>, or</P></LI>

<LI><P>...</P></LI>

</UL>

</BLOCKQUOTE>

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