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    CWG Issue 2936</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="2936"></A><H4>2936.
  
Local classes of templated functions should be part of the current instantiation
</H4>
<B>Section: </B>13.8.3.2&#160; [<A href="https://wg21.link/temp.dep.type">temp.dep.type</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD7
 &#160;&#160;&#160;

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

 <B>Date: </B>2024-09-02<BR>


<P>[Accepted as a DR at the November, 2024 meeting.]</P>



<P>Consider:</P>

<PRE>
  template&lt;class T&gt;
  void f()
  {
    struct Y {
      using type = int;
    };
    Y::type y;  //<SPAN CLASS="cmnt"> error; missing typename</SPAN>
  }
</PRE>

<P>Since lookup of <TT>Y</TT> always finds the local class, regardless
of <TT>T</TT>, the requirement to apply <TT>typename</TT> is too
strict.</P>

<P><B>Proposed resolution (approved by CWG 2024-11-08):</B></P>

<P>Change in 13.8.3.2 [<A href="https://wg21.link/temp.dep.type#1">temp.dep.type</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

A name or <I>template-id</I> refers to the current instantiation if it
is

<UL>
<LI>...</LI>

<LI>in the definition of a nested class of a class template, the name
of the nested class referenced as a member of the current
instantiation, <DEL>or</DEL>
</LI>

<LI>in the definition of a class template partial specialization or a
member of a class template partial specialization, the name of the
class template followed by a template argument list equivalent to that
of the partial specialization (13.7.6 [<A href="https://wg21.link/temp.spec.partial">temp.spec.partial</A>]) enclosed
in &lt;&gt; (or an equivalent template alias specialization)<DEL>.</DEL><INS>, or</INS>
</LI>

<LI class="ins">in the definition of a templated function, the name of
a local class (11.6 [<A href="https://wg21.link/class.local">class.local</A>].</LI>

</UL>
</BLOCKQUOTE>

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