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    CWG Issue 1161</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="1161"></A><H4>1161.
  
Dependent <I>nested-name-specifier</I> in a pointer-to-member declarator
</H4>
<B>Section: </B>13.8&#160; [<A href="https://wg21.link/temp.res">temp.res</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>GB
 &#160;&#160;&#160;

 <B>Date: </B>2010-08-03<BR><BR>


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

<A href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3296.html#GB44">N3092 comment
  GB&#160;44<BR></A>

<P>It is not clear from the current wording of 13.8 [<A href="https://wg21.link/temp.res">temp.res</A>]
whether the following is well-formed or not:</P>

<PRE>
    template&lt;typename T&gt; struct id { typedef T type; };
    template&lt;typename T&gt; void f() { int id&lt;T&gt;::type::*p = 0; }
    struct A { };
    int main() { f&lt;A&gt;(); }
</PRE>

<P>If <TT>typename</TT> is required before the use of
<TT>id&lt;T&gt;::type</TT>, it is not permitted by the current
syntax.</P>

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

<P>Change 13.8 [<A href="https://wg21.link/temp.res#5">temp.res</A>] paragraph 5 as follows:</P>

<BLOCKQUOTE>

A qualified name used as the name in a <I>mem-initializer-id</I>, a
<I>base-specifier</I>, or an
<I>elaborated-type-specifier</I> is implicitly assumed to
name a type, without the use of the <TT>typename</TT>
keyword. <INS>In a <I>nested-name-specifier</I> that
immediately contains a <I>nested-name-specifier</I> that
depends on a template parameter, the <I>identifier</I> or
<I>simple-template-id</I> is implicitly assumed to name a
type, without the use of the <TT>typename</TT>
keyword.</INS> [<I>Note:</I> the <TT>typename</TT> keyword
is not permitted by the syntax of these
constructs. &#8212;<I>end note</I>]

</BLOCKQUOTE>

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