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    CWG Issue 1896</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="1896"></A><H4>1896.
  
Repeated alias templates
</H4>
<B>Section: </B>13.7.8&#160; [<A href="https://wg21.link/temp.alias">temp.alias</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD6
 &#160;&#160;&#160;

 <B>Submitter: </B>Mike Miller
 &#160;&#160;&#160;

 <B>Date: </B>2014-03-18<BR>


<P>[Accepted at the November, 2020 meeting as part of paper P1787R6 and
moved to DR at the February, 2021 meeting.]</P>

<P>The current wording of the Standard does not permit repeated
alias template declarations within a scope, but some current
implementations allow it, presumably by analogy with typedef
declarations.  Should the Standard be changed to permit this usage?</P>

<P><B>Notes from the November, 2014 meeting:</B></P>

<P>CWG agreed that the usage should be permitted, provided that
the dependent types are equivalent.  Note that this is a weaker
requirement than the token-for-token identity of the ODR, since
alias templates are not definitions per Clause 13 [<A href="https://wg21.link/temp#1">temp</A>] paragraph 1.
</P>

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