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    CWG Issue 2162</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="2162"></A><H4>2162.
  
Capturing <TT>this</TT> by reference
</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>Brian Bi
 &#160;&#160;&#160;

 <B>Date: </B>2015-07-23<BR>


<P>The current wording of 7.5.6 [<A href="https://wg21.link/expr.prim.lambda">expr.prim.lambda</A>] paragraphs 15
and 16 does not, but presumably should, indicate that <TT>this</TT>,
if implicitly captured, is always captured by copy and not by
reference.</P>

<P><B>Proposed resolution (February, 2016):</B></P>

<P>Change 7.5.6 [<A href="https://wg21.link/expr.prim.lambda#15">expr.prim.lambda</A>] paragraph 15 as follows,
dividing the existing text into a bulleted list:</P>

<BLOCKQUOTE>

<P>An entity is <I>captured by copy</I> if</P>

<UL>
<LI><P><INS>it is <TT>this</TT>,</INS></P></LI>

<LI><P>it is implicitly captured and the <I>capture-default</I> is
<TT>=</TT><INS>,</INS> or</P></LI>

<LI><P>
<DEL>if</DEL> it is explicitly captured with a
capture that is not of the
form <TT>&amp;</TT> <I>identifier</I>
or <TT>&amp;</TT> <I>identifier initializer</I>.</P></LI>

</UL>

<P>For each entity captured by copy...</P>

</BLOCKQUOTE>

<P><B>Notes from the February, 2016 meeting:</B></P>

<P>Paper P0018 is intended to change this area, so this issue is
being returned to "review" status to accommodate those changes.</P>

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