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    CWG Issue 1482</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="1482"></A><H4>1482.
  
Point of declaration of enumeration
</H4>
<B>Section: </B>6.4.2&#160; [<A href="https://wg21.link/basic.scope.pdecl">basic.scope.pdecl</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD3
 &#160;&#160;&#160;

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

 <B>Date: </B>2012-03-20<BR>


<P>[Moved to DR at the April, 2013 meeting.]</P>

<P>According to 6.4.2 [<A href="https://wg21.link/basic.scope.pdecl#2">basic.scope.pdecl</A>] paragraph 2,</P>

<BLOCKQUOTE>

The point of declaration for an enumeration is immediately after the
identifier (if any) in either its <I>enum-specifier</I> (9.8.1 [<A href="https://wg21.link/dcl.enum">dcl.enum</A>]) or its first <I>opaque-enum-declaration</I> (9.8.1 [<A href="https://wg21.link/dcl.enum">dcl.enum</A>]), whichever comes first.

</BLOCKQUOTE>

<P>This would make the following example well-formed:</P>

<PRE>
  template&lt;typename T&gt; struct S { typedef char I; };
  enum E: S&lt;E&gt;::I { e };
</PRE>

<P>Presumably that would make <TT>E</TT> an incomplete enumeration type
for the instantiation of <TT>S&lt;E&gt;</TT> (a concept not otherwise
found in the Standard).  However, some implementations reject this
example, presumably making the point of declaration after the
<I>enum-base</I>.  We either need to make it ill-formed or describe
incomplete enumeration types.</P>

<P>See also <A HREF="977.html">issue 977</A>.</P>

<P><B>Proposed resolution (December, 2012):</B></P>

<OL>
<LI><P>Change 6.9 [<A href="https://wg21.link/basic.types#5">basic.types</A>] paragraph 5 as follows:</P></LI>

<BLOCKQUOTE>

A class that has been declared but not defined, <INS>an enumeration
type in certain contexts (9.8.1 [<A href="https://wg21.link/dcl.enum">dcl.enum</A>]),</INS> or an array
of unknown size or of incomplete element type, is an
incompletely-defined object type.<SUP>43</SUP> Incompletely-defined
object types...

</BLOCKQUOTE>

<LI><P>Add the following as a new paragraph preceding
9.8.1 [<A href="https://wg21.link/dcl.enum#6">dcl.enum</A>] paragraph 6:</P></LI>

<BLOCKQUOTE>

<P><INS>An enumeration whose underlying type is fixed is an incomplete
type from its point of declaration (6.4.2 [<A href="https://wg21.link/basic.scope.pdecl">basic.scope.pdecl</A>]) to
immediately after its <I>enum-base</I> (if any), at which point it
becomes a complete type. An enumeration whose underlying type is not
fixed is an incomplete type from its point of declaration to
immediately after the closing <TT>}</TT> of its
<I>enum-specifier</I>, at which point it becomes a complete
type.</INS></P>

<P>For an enumeration whose underlying type is not fixed...</P>

</BLOCKQUOTE>

</OL>

<P>This resolution also resolves <A HREF="977.html">issue 977</A>.</P>

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