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    CWG Issue 2378</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="2378"></A><H4>2378.
  
Inconsistent grammar for reference <I>init-capture</I> of pack
</H4>
<B>Section: </B>7.5.6.3&#160; [<A href="https://wg21.link/expr.prim.lambda.capture">expr.prim.lambda.capture</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++20
 &#160;&#160;&#160;

 <B>Submitter: </B>Barry Revzin
 &#160;&#160;&#160;

 <B>Date: </B>2018-06-14<BR>


<P>[Accepted (as paper P2095R0) at the February, 2020 (Prague) meeting.]</P>



<P>The grammar for <I>init-capture</I> is:</P>

<UL>
<I>capture:</I>
<UL>
<TT>...</TT><I><SUB>opt</SUB> init-capture</I>
</UL>
</UL>

<UL>
<I>init-capture:</I>
<UL>
<I>identifier initializer</I><BR>
<TT>&amp;</TT> <I>identifier initializer</I>
</UL>
</UL>

<P>As a consequence a reference init-capture pack is written as</P>

<PRE>
  [...&amp;x = init]
</PRE>

<P>instead of the way packs of references are commonly written:</P>

<PRE>
  [&amp;...x = init]
</PRE>

<P><B>Notes from the November, 2018 meeting:</B></P>

<P>CWG agreed with the suggested direction.</P>

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