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    CWG Issue 2071</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="2071"></A><H4>2071.
  
<TT>typedef</TT> with no declarator
</H4>
<B>Section: </B>9.2.4&#160; [<A href="https://wg21.link/dcl.typedef">dcl.typedef</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD4
 &#160;&#160;&#160;

 <B>Submitter: </B>Richard Smith
 &#160;&#160;&#160;

 <B>Date: </B>2014-01-16<BR>


<P>[Adopted at the February, 2016 meeting.]</P>



<P>There should be a rule to prohibit the almost certainly
erroneous declaration</P>

<PRE>
  typedef struct X { };    //<SPAN CLASS="cmnt"> Missing declarator</SPAN>
</PRE>

<P><B>Proposed resolution (September, 2015):</B></P>

<P>Change 9.2.4 [<A href="https://wg21.link/dcl.typedef#1">dcl.typedef</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

Declarations containing the <I>decl-specifier</I> <TT>typedef</TT> declare
identifiers that can be used later for naming fundamental
(6.9.2 [<A href="https://wg21.link/basic.fundamental">basic.fundamental</A>]) or compound (6.9.4 [<A href="https://wg21.link/basic.compound">basic.compound</A>])
types. The <TT>typedef</TT> specifier shall not be combined in
a <I>decl-specifier-seq</I> with any other kind of specifier except
a <I>type-specifier</I>, and it shall not be used in
the <I>decl-specifier-seq</I> of a <I>parameter-declaration</I>
(9.3.4.6 [<A href="https://wg21.link/dcl.fct">dcl.fct</A>]) nor in the <I>decl-specifier-seq</I> of
a <I>function-definition</I> (9.6 [<A href="https://wg21.link/dcl.fct.def">dcl.fct.def</A>]). <INS>If
a <TT>typedef</TT> specifier appears in a declaration without
a <I>declarator</I>, the program is ill-formed.</INS>

</BLOCKQUOTE>

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