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    CWG Issue 924</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="924"></A><H4>924.
  
<I>alias-declaration</I> as a class member
</H4>
<B>Section: </B>11.4&#160; [<A href="https://wg21.link/class.mem">class.mem</A>]
 &#160;&#160;&#160;

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

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

 <B>Date: </B>23 June, 2009<BR><BR>


<A href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3296.html#FI10">N3092 comment
  FI&#160;10<BR></A>

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

<P>The grammar for <I>member-declaration</I> in 11.4 [<A href="https://wg21.link/class.mem">class.mem</A>] does not include a production for the
<I>alias-declaration</I> form of typedef declarations, meaning that
something like</P>

<PRE>
    struct S {
      using UINT = unsigned int;
    };
</PRE>

<P>is ill-formed.  This seems like an oversight.</P>

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

<P>In the grammar in 11.4 [<A href="https://wg21.link/class.mem">class.mem</A>], add the indicated
production to the definition of <I>member-declaration</I>:</P>

<UL>
<I>member-declaration:</I>
<UL>
<I>decl-specifier-seq<SUB>opt</SUB> attribute-specifier<SUB>opt</SUB> member-declarator-list<SUB>opt</SUB></I> <TT>;</TT>
</UL>
<UL>
<I>function-definition</I> <TT>;</TT><SUB><I>opt</I></SUB>
</UL>
<UL>
<TT>::</TT><SUB><I>opt</I></SUB> <I>nested-name-specifier</I> <TT>template</TT><SUB><I>opt</I></SUB> <I>unqualified-id</I> <TT>;</TT>
</UL>
<UL><I>using-declaration</I></UL>
<UL><I>static_assert-declaration</I></UL>
<UL><I>template-declaration</I></UL>
<UL><INS><I>alias-declaration</I></INS></UL>
</UL>

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