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    CWG Issue 2129</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="2129"></A><H4>2129.
  
Non-object prvalues and constant expressions
</H4>
<B>Section: </B>7.7&#160; [<A href="https://wg21.link/expr.const">expr.const</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Faisal Vali
 &#160;&#160;&#160;

 <B>Date: </B>2015-05-20<BR>


<P>[Adopted at the February, 2016 meeting.]</P>



<P>According to 7.7 [<A href="https://wg21.link/expr.const#5">expr.const</A>] paragraph 5,</P>

<BLOCKQUOTE>

A constant expression is either a glvalue core constant
expression whose value... or a prvalue core constant
expression whose value is an object where...

</BLOCKQUOTE>

<P>Since an integer literal is prvalue that is not an
object, this definition does not allow it to be a
constant expression.</P>

<P><B>Proposed resolution (February, 2016):</B></P>

<P>Change 7.7 [<A href="https://wg21.link/expr.const#5">expr.const</A>] paragraph 5 as follows:</P>

<BLOCKQUOTE>

<P>A <I>constant expression</I> is either a glvalue core constant
expression whose value refers to an entity that is a
permitted result of a constant expression (as defined
below), or a prvalue core constant expression whose value <DEL>is
an object where, for that object and its subobjects</DEL>
<INS>satisfies the following constraints</INS>:</P>

<UL>
<LI><P>
<INS>if the value is an object of class
type,</INS> each non-static data member of reference type
refers to an entity that is a permitted result of a constant
expression, <DEL>and</DEL>
</P></LI>

<LI><P>if the <DEL>object or
subobject</DEL> <INS>value</INS> is of pointer type, it
contains the address of an object with static storage
duration, the address past the end of such an object
(7.6.6 [<A href="https://wg21.link/expr.add">expr.add</A>]), the address of a function, or a
null pointer value<DEL>.</DEL><INS>, and</INS>
</P></LI>

<LI><P><INS>if the value is an object of class or array type,
each subobject satisfies these constraints for the value.</INS></P></LI>

</UL>

<P>An entity is a <I>permitted result of a constant
expression</I> if...</P>

</BLOCKQUOTE>

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