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    CWG Issue 2070</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="2070"></A><H4>2070.
  
<I>using-declaration</I> with dependent <I>nested-name-specifier</I>
</H4>
<B>Section: </B>6.5.5.2&#160; [<A href="https://wg21.link/class.qual">class.qual</A>]
 &#160;&#160;&#160;

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

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

 <B>Date: </B>2015-01-15<BR>


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



<P>It makes no sense for a user to write a class template that
contains a <I>using-declaration</I> that is sometimes an
inheriting constructor declaration and sometimes pulls in a
named value from a base class; These are sufficiently
different things that we're doing them a disservice by
conflating them. We're also doing a disservice to all
<I>readers</I> of the code, by allowing an inheriting constructor
to be written using a syntax that does not look like one.</P>

<P>In an inheriting constructor <I>using-declaration</I>, the
<I>nested-name-specifier</I> and the <I>unqualified-id</I> should
be required to be the same <I>identifier</I>.</P>

<P><B>Notes from the May, 2015 meeting:</B></P>

<P>The consensus of CWG was that the same name should be required
when the <I>nested-name-specifier</I> is dependent and in the
<I>using-declaration</I> case but should be allowed to be different
in all other cases.  See also issues <A HREF="156.html">156</A>
and <A HREF="399.html">399</A>.</P>

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