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    CWG Issue 1527</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="1527"></A><H4>1527.
  
Assignment from <I>braced-init-list</I>
</H4>
<B>Section: </B>7.6.19&#160; [<A href="https://wg21.link/expr.assign">expr.assign</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD3
 &#160;&#160;&#160;

 <B>Submitter: </B>Mike Miller
 &#160;&#160;&#160;

 <B>Date: </B>2012-07-23<BR>


<P>[Moved to DR at the April, 2013 meeting.]</P>



<P>According to 7.6.19 [<A href="https://wg21.link/expr.assign#9">expr.assign</A>] paragraph 9,</P>

<BLOCKQUOTE>

<P>A <I>braced-init-list</I> may appear on the right-hand side of</P>

<UL>
<LI><P>an assignment to a scalar...
</P></LI>

<LI><P>an assignment defined by a user-defined assignment operator, in which
case the initializer list is passed as the argument to the operator
function.
</P></LI>

</UL>

</BLOCKQUOTE>

<P>Presumably the phrase &#8220;user-defined&#8221; is not intended to
forbid an example like</P>

<PRE>
  struct A {
    A();
    A ( std::initializer_list&lt;int&gt; ) ;
  };
  void f() {
    A a;
    a = {37};
  }
</PRE>

<P>which relies on an implicitly-declared assignment operator.</P>

<P><B>Proposed resolution (August, 2012):</B></P>

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

<BLOCKQUOTE>

<P>A <I>braced-init-list</I> may appear on the right-hand side of</P>

<UL>
<LI><P>an assignment to a scalar, in which case the initializer
list shall have at most a single element.  The meaning of
<TT>x={v}</TT>, where <TT>T</TT> is the scalar type of the expression
<TT>x</TT>, is that of <TT>x=T(v)</TT> except that no narrowing
conversion (8.5.4) is allowed. The meaning of <TT>x={}</TT> is
<TT>x=T()</TT>.
</P></LI>

<LI><P>an assignment <DEL>defined by a user-defined assignment
operator</DEL> <INS>to an object of class type</INS>, in which case
the initializer list is passed as the argument to the
<INS>assignment</INS> operator function <INS>selected by overload
resolution (12.4.3.2 [<A href="https://wg21.link/over.assign">over.assign</A>], 12.2 [<A href="https://wg21.link/over.match">over.match</A>])</INS>.
</P></LI>

</UL>

</BLOCKQUOTE>

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