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    CWG Issue 2853</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="2853"></A><H4>2853.
  
Pointer arithmetic with pointer to hypothetical element
</H4>
<B>Section: </B>7.6.6&#160; [<A href="https://wg21.link/expr.add">expr.add</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD7
 &#160;&#160;&#160;

 <B>Submitter: </B>Jim X
 &#160;&#160;&#160;

 <B>Date: </B>2024-02-03<BR>


<P>[Accepted as a DR at the March, 2024 meeting.]</P>

<P>(From submission
<A HREF="https://github.com/cplusplus/CWG/issues/495">#495</A>.)</P>

<P>The phrasing in 7.6.6 [<A href="https://wg21.link/expr.add#4.2">expr.add</A>] bullet 4.2 excludes
pointer arithmetic on a pointer pointing to the hypothetical
(past-the-end) array element.</P>

<P><B>Proposed resolution (approved by CWG 2024-02-16):</B></P>

<P>Change in 7.6.6 [<A href="https://wg21.link/expr.add#4.2">expr.add</A>] bullet 4.2 as follows:</P>

<BLOCKQUOTE>

<UL>
<LI>...</LI>
<LI>
Otherwise, if P points to <DEL>an</DEL> <INS>a
(possibly-hypothetical)</INS> array element i of an array object x
with n elements (9.3.4.5 [<A href="https://wg21.link/dcl.array">dcl.array</A>]), [ Footnote: ... ] the
expressions P + J and J + P (where J has the value j) point to the
(possibly-hypothetical) array element i + j of x if 0 &lt;= i + j
&lt;= n and the expression P - J points to the (possibly-hypothetical)
array element i - j of x if 0 &lt;= i - j &lt;= n.
</LI>
</UL>

</BLOCKQUOTE>

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