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    CWG Issue 930</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="930"></A><H4>930.
  
<TT>alignof</TT> with incomplete array type
</H4>
<B>Section: </B>7.6.2.6&#160; [<A href="https://wg21.link/expr.alignof">expr.alignof</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD2
 &#160;&#160;&#160;

 <B>Submitter: </B>Alisdair Meredith
 &#160;&#160;&#160;

 <B>Date: </B>6 July, 2009<BR>


<P>[Voted into WP at October, 2009 meeting.]</P>



<P>7.6.2.6 [<A href="https://wg21.link/expr.alignof#1">expr.alignof</A>] paragraph 1 currently says regarding
<TT>alignof</TT>,</P>

<BLOCKQUOTE>

The operand shall be a <I>type-id</I> representing a complete
effective object type or a reference to a complete effective object
type.

</BLOCKQUOTE>

<P>This prohibits taking the alignment of an array type with an
unknown bound.  There doesn't appear to be any reason for this
restriction.</P>

<P><B>Proposed resolution (July, 2009):</B></P>

<P>Change 7.6.2.6 [<A href="https://wg21.link/expr.alignof#1">expr.alignof</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

The operand shall be a type-id representing a complete effective
object type <INS>or an array thereof</INS> or a reference to a
complete effective object type.

</BLOCKQUOTE>

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