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    CWG Issue 1079</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="1079"></A><H4>1079.
  
Overload resolution involving aggregate initialization
</H4>
<B>Section: </B>12.2.4.3&#160; [<A href="https://wg21.link/over.ics.rank">over.ics.rank</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++11
 &#160;&#160;&#160;

 <B>Submitter: </B>Jason Merrill
 &#160;&#160;&#160;

 <B>Date: </B>2010-06-15<BR>


<P>[Voted into the WP at the March, 2011 meeting as part of paper N3262.]</P>



<P>The current wording makes some calls involving aggregate
initialization ambiguous that should not be.  For example, the
calls below to <TT>f</TT> and <TT>g</TT> should each prefer the
second overload:</P>

<PRE>
    struct A { int i; };

    void f (const A &amp;);
    void f (A &amp;&amp;);

    void g (A, double);
    void g (A, int);

    int main() {
       f ( { 1 } );
       g ( { 1 }, 1 );
    }
</PRE>

<P><B>Proposed resolution (August, 2010) [SUPERSEDED]:</B></P>

<P>Change 12.2.4.3 [<A href="https://wg21.link/over.ics.rank">over.ics.rank</A>]
bullet 3.2 as follows:</P>

<UL><LI><P>User-defined conversion sequence <TT>U1</TT> is a better
conversion sequence than another user-defined conversion sequence
<TT>U2</TT> if they contain the same user-defined conversion function
or constructor <INS>or aggregate initialization</INS> and if the
second standard conversion sequence of <TT>U1</TT> is better than the
second standard conversion sequence of <TT>U2</TT>.</P></LI></UL>

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