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    CWG Issue 424</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="424"></A><H4>424.
  
Wording problem with issue 56 resolution on redeclaring typedefs in class scope
</H4>
<B>Section: </B>9.2.4&#160; [<A href="https://wg21.link/dcl.typedef">dcl.typedef</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD1
 &#160;&#160;&#160;

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

 <B>Date: </B>25 June 2003<BR>


<P>[Voted into WP at March 2004 meeting.]</P>

<P>I wonder if perhaps the <A HREF="56.html">core issue 56</A>
change in 9.2.4 [<A href="https://wg21.link/dcl.typedef#2">dcl.typedef</A>] paragraph 2
wasn't quite careful enough.  The intent was to remove
the allowance for:</P>
<PRE>
  struct S {
    typedef int I;
    typedef int I;
  };
</PRE>
<P>but I think it also disallows the following:</P>
<PRE>
  class B {
    typedef struct A {} A;
    void f(struct B::A*p);
  };
</PRE>

<P>See also <A HREF="407.html">issue 407</A>.</P>

<P><B>Proposed resolution (October 2003):</B></P>

<P>At the end of 9.2.4 [<A href="https://wg21.link/dcl.typedef#2">dcl.typedef</A>] paragraph 2,
 add the following:</P>
<BLOCKQUOTE>
In a given class scope, a <TT>typedef</TT> specifier can be used to redefine
any <I>class-name</I> declared in that scope that is not
also a <I>typedef-name</I>
to refer to the type to which it already refers. [<I>Example:</I>
<PRE>
  struct S {
    typedef struct A {} A;  // OK
    typedef struct B B;     // OK
    typedef A A;            // error
  };
</PRE>
]
</BLOCKQUOTE>

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