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    CWG Issue 1036</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="1036"></A><H4>1036.
  
Alignment attribute in an <I>exception-declaration</I>
</H4>
<B>Section: </B>9.13.2&#160; [<A href="https://wg21.link/dcl.align">dcl.align</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++11
 &#160;&#160;&#160;

 <B>Submitter: </B>Daveed Vandevoorde
 &#160;&#160;&#160;

 <B>Date: </B>2010-02-26<BR>


<P>[Voted into the WP at the November, 2010 meeting.]</P>

<P>The Standard explicitly bans alignment attributes for function parameters
(9.13.2 [<A href="https://wg21.link/dcl.align#1">dcl.align</A>] paragraph 1), but it is silent regarding
the &#8220;parameter&#8221; of an exception handler.  This should be
clarified one way or the other.</P>

<P><B>Proposed resolution (October, 2010):</B></P>

<P>Change 9.13.2 [<A href="https://wg21.link/dcl.align#1">dcl.align</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

...The <I>attribute</I> may be followed by an ellipsis.  The attribute
may be applied to a variable <DEL>that is neither a function parameter
nor declared with the register storage class specifier and to a class
data member that is not a bit-field</DEL> <INS>or to a class data
member, but it shall not be applied to a bit-field, a function
parameter, the formal parameter of a catch clause (14.4 [<A href="https://wg21.link/except.handle">except.handle</A>]), or a variable declared with the <TT>register</TT>
storage class specifier</INS>. The attribute may also be applied to
the declaration of a class or enumeration type.

</BLOCKQUOTE>

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