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    CWG Issue 2229</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="2229"></A><H4>2229.
  
Volatile unnamed bit-fields
</H4>
<B>Section: </B>11.4.10&#160; [<A href="https://wg21.link/class.bit">class.bit</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD5
 &#160;&#160;&#160;

 <B>Submitter: </B>David Majnemer
 &#160;&#160;&#160;

 <B>Date: </B>2016-02-08<BR>


<P>[Accepted as a DR at the March, 2018 (Jacksonville) meeting.]</P>

<P>According to 11.4.10 [<A href="https://wg21.link/class.bit#2">class.bit</A>] paragraph 2, unnamed bit-fields
are not members, but there does not appear to be a prohibition against
their being declared <TT>volatile</TT>. Is this intended?</P>

<P><B>Proposed resolution (November, 2017)</B></P>

<P>Change 11.4.10 [<A href="https://wg21.link/class.bit#2">class.bit</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

A declaration for a bit-field that omits the <I>identifier</I> declares an
<I>unnamed bit-field</I>. Unnamed bit-fields are not members and cannot be
initialized. <INS>An unnamed bit-field shall not be declared with a
cv-qualified type.</INS> [<I>Note:</I> An unnamed bit-field is useful for
padding...

</BLOCKQUOTE>

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