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    CWG Issue 855</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="855"></A><H4>855.
  
Incorrect comments in <I>braced-init-list</I> assignment example
</H4>
<B>Section: </B>7.6.19&#160; [<A href="https://wg21.link/expr.assign">expr.assign</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD2
 &#160;&#160;&#160;

 <B>Submitter: </B>Daniel Kr&#252;gler
 &#160;&#160;&#160;

 <B>Date: </B>5 April, 2009<BR>


<P>[Voted into WP at October, 2009 meeting.]</P>



<P>7.6.19 [<A href="https://wg21.link/expr.assign#9">expr.assign</A>] paragraph 9 has the following example:</P>

<PRE>
    complex&lt;double&gt; z;
    z = { 1,2 };      //<SPAN CLASS="cmnt"> meaning </SPAN>z.operator=(1,2)
    z += { 1, 2 };    //<SPAN CLASS="cmnt"> meaning </SPAN>z.operator+=(1,2)
</PRE>

<P>These comments make it look as if the assignment operator takes two
arguments, which is obviously not the case.  It would be better if the
comments read something like</P>

<PRE>
     //<SPAN CLASS="cmnt"> meaning </SPAN>z.operator=(complex&lt;double&gt;(1,2))
</PRE>

<P>or even</P>

<PRE>
    //<SPAN CLASS="cmnt"> meaning </SPAN>z.operator=({1,2})<SPAN CLASS="cmnt">, resolves to</SPAN>
    //<SPAN CLASS="cmnt"> </SPAN>z.operator=(complex&lt;double&gt;(1,2)
</PRE>

<P><B>Proposed resolution (July, 2009):</B></P>

<P>Change the example in 7.6.19 [<A href="https://wg21.link/expr.assign#9">expr.assign</A>] paragraph 9 as
follows:</P>

<BLOCKQUOTE>

<P>[<I>Example:</I>
</P>

<PRE>
  complex&lt;double&gt; z;
  z = { 1,2 };        //<SPAN CLASS="cmnt"> meaning </SPAN>z.operator=(<INS>{</INS>1,2<INS>}</INS>)
  z += { 1, 2 };      //<SPAN CLASS="cmnt"> meaning </SPAN>z.operator+=(<INS>{</INS>1,2<INS>}</INS>)
<INS>  int a, b;</INS>
  a = b = { 1 };      //<SPAN CLASS="cmnt"> meaning </SPAN>a=b=1;
  a = { 1 } = b;      //<SPAN CLASS="cmnt"> syntax error</SPAN>
</PRE>

<P>&#8212;<I>end example</I>]</P>

</BLOCKQUOTE>

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