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    CWG Issue 755</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="755"></A><H4>755.
  
Generalized <I>lambda-capture</I>s
</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>CD3
 &#160;&#160;&#160;

 <B>Submitter: </B>John Freeman
 &#160;&#160;&#160;

 <B>Date: </B>11 December, 2008<BR>




<P>In the current specification of lambda expressions, a name appearing
in a <I>lambda-capture</I> must refer to a local variable or reference
with automatic storage duration (7.5.6 [<A href="https://wg21.link/expr.prim.lambda">expr.prim.lambda</A>] paragraph
3).  This restriction seems unnecessary and possibly confusing.</P>

<P>One possibility would be to extend the syntax of the
<I>lambda-capture</I> to be something like</P>

<BLOCKQUOTE>

<TT>v = </TT><I>expr</I>

</BLOCKQUOTE>

<P>with the meaning that the closure object would have a member
named <TT>v</TT> initialized with the value <I>expr</I>.  With this
extension, the current syntax could be viewed as an abbreviation
for</P>

<BLOCKQUOTE>

<TT>v = v</TT>

</BLOCKQUOTE>

<P><B>Rationale, March, 2009:</B></P>

<P>This idea was discussed and rejected by the EWG.</P>

<P><B>This issue was addressed by the adoption of N3648, adopted at the
April, 2013 (Bristol) meeting.</B></P>

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