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    CWG Issue 2638</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="2638"></A><H4>2638.
  
Improve the example for initializing by initializer list
</H4>
<B>Section: </B>9.5.5&#160; [<A href="https://wg21.link/dcl.init.list">dcl.init.list</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD7
 &#160;&#160;&#160;

 <B>Submitter: </B>Shafik Yaghmour
 &#160;&#160;&#160;

 <B>Date: </B>2022-10-26<BR>


<P>[Accepted as a DR at the March, 2024 meeting.]</P>

<P>
<A HREF="2137.html">Issue 2137</A> amended the rules for
initialization by initializer list, but neglected to add an
example.</P>

<P><B>Proposed resolution (approved by CWG 2023-11-11):</B></P>

<P>Change the example in 9.5.5 [<A href="https://wg21.link/dcl.init.list#3.7">dcl.init.list</A>] bullet 3.7 as follows:</P>

<PRE>
struct S {
  S(std::initializer_list&lt;double&gt;); //<SPAN CLASS="cmnt"> #1</SPAN>
  S(std::initializer_list&lt;int&gt;);    //<SPAN CLASS="cmnt"> #2</SPAN>
  <INS>S(std::initializer_list&lt;S&gt;);      //<SPAN CLASS="cmnt"> #3</SPAN></INS>
  S();                              //<SPAN CLASS="cmnt"> <DEL>#3</DEL><INS>#4</INS></SPAN>

  //<SPAN CLASS="cmnt"> ...</SPAN>
};
S s1 = { 1.0, 2.0, 3.0 };  //<SPAN CLASS="cmnt"> invoke #1</SPAN>
S s2 = { 1, 2, 3 };        //<SPAN CLASS="cmnt"> invoke #2</SPAN>
<INS>S s3{s2};                  //<SPAN CLASS="cmnt"> invoke #3 (not the copy constructor)</SPAN></INS>
S <DEL>s3</DEL><INS>s4</INS> = { };              //<SPAN CLASS="cmnt"> invoke <DEL>#3</DEL><INS>#4</INS></SPAN>
</PRE>

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