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    CWG Issue 2529</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="2529"></A><H4>2529.
  
Constant destruction of constexpr references
</H4>
<B>Section: </B>7.7&#160; [<A href="https://wg21.link/expr.const">expr.const</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++23
 &#160;&#160;&#160;

 <B>Submitter: </B>Jiang An
 &#160;&#160;&#160;

 <B>Date: </B>2022-02-08<BR>


<P>[Accepted as a DR at the February, 2023 meeting.]</P>

<P>According to 9.2.6 [<A href="https://wg21.link/dcl.constexpr#10">dcl.constexpr</A>] paragraph 10,
a constexpr variable must have constant destruction.
However, 7.7 [<A href="https://wg21.link/expr.const#7">expr.const</A>] paragraph 7 only defines
constant destruction for objects, not for references.
Presumably constexpr references should also be able to
have constant destruction, and any temporary object to
which such a reference is bound should also be required
to have constant destruction.</P>

<P><B>Proposed resolution (approved by CWG 2022-12-02):</B></P>

<P>Change in 9.2.6 [<A href="https://wg21.link/dcl.constexpr#7">dcl.constexpr</A>] paragraph 7 as follows:</P>

<BLOCKQUOTE>

A <TT>constexpr</TT> specifier used in an object declaration declares
the object as const. Such an object shall have literal type and shall
be initialized. In any constexpr variable declaration, the
full-expression of the initialization shall be a constant expression
(7.7 [<A href="https://wg21.link/expr.const">expr.const</A>]). A constexpr variable <INS>that is an
object, as well as any temporary to which a constexpr reference is
bound,</INS> shall have constant destruction. [ Example: ... ]

</BLOCKQUOTE>

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