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    CWG Issue 896</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="896"></A><H4>896.
  
Rvalue references and rvalue-reference conversion functions
</H4>
<B>Section: </B>9.5.4&#160; [<A href="https://wg21.link/dcl.init.ref">dcl.init.ref</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Steve Adamczyk
 &#160;&#160;&#160;

 <B>Date: </B>9 May, 2009<BR>


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

<P>Consider the following example:</P>

<PRE>
    struct A { } a;
    struct B {
      operator A&amp;&amp;() {
        return static_cast&lt;A&amp;&amp;&gt;(a);
      }
    };
    A&amp;&amp; r = B();
</PRE>

<P>One would expect that <TT>r</TT> would be bound to the object
returned by <TT>B::operator A&amp;&amp;()</TT>, i.e., <TT>a</TT>.
However, the logic in 9.5.4 [<A href="https://wg21.link/dcl.init.ref#5">dcl.init.ref</A>] paragraph 5
requires that the result of the conversion function be copied to a
temporary and <TT>r</TT> bound to the temporary.</P>

<P>Probably the way to address this is to add another top-level bullet
between the first and second that would essentially mimic the first
bullet except dealing with rvalue references: direct binding to
reference-compatible rvalues or to the reference-compatible result of
a conversion function.  (Note that this should only apply to class
rvalues; the creation of a temporary for non-class rvalues is
necessary to have an object for the reference to bind to.)</P>

<P>(See also <A HREF="656.html">issue 656</A>.)</P>

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

<P>This issue is resolved by the resolution of <A HREF="656.html">issue 656</A>.</P>

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