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    CWG Issue 2130</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="2130"></A><H4>2130.
  
Over-aligned types in <I>new-expression</I>s
</H4>
<B>Section: </B>7.6.2.8&#160; [<A href="https://wg21.link/expr.new">expr.new</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Richard Smith
 &#160;&#160;&#160;

 <B>Date: </B>2015-05-28<BR>


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



<P>According to 7.6.2.8 [<A href="https://wg21.link/expr.new#1">expr.new</A>] paragraph 1,</P>

<BLOCKQUOTE>

It is implementation-defined whether over-aligned types
are supported (6.8.3 [<A href="https://wg21.link/basic.align">basic.align</A>]).

</BLOCKQUOTE>

<P>However, there is no mechanism for informing an allocation
function of the required alignment for over-aligned types.
Nevertheless, 6.8.3 [<A href="https://wg21.link/basic.align#9">basic.align</A>] paragraph 9 says:</P>

<BLOCKQUOTE>

Additionally, a request for runtime allocation of dynamic
storage for which the requested alignment cannot be honored
shall be treated as an allocation failure.

</BLOCKQUOTE>

<P>This seems contradictory.</P>

<P><B>Proposed resolution (October, 2015):</B></P>

<P>Change 6.8.3 [<A href="https://wg21.link/basic.align#9">basic.align</A>] paragraph 9 as follows:</P>

<BLOCKQUOTE>

If a request for a specific extended alignment in a specific
context is not supported by an implementation, the program
is ill-formed. <DEL>Additionally, a request for runtime
allocation of dynamic storage for which the requested
alignment cannot be honored shall be treated as an
allocation failure.</DEL>

</BLOCKQUOTE>

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