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    CWG Issue 877</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="877"></A><H4>877.
  
Viable functions and binding references to rvalues
</H4>
<B>Section: </B>12.2.3&#160; [<A href="https://wg21.link/over.match.viable">over.match.viable</A>]
 &#160;&#160;&#160;

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

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

 <B>Date: </B>23 April, 2009<BR>


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



<P>12.2.3 [<A href="https://wg21.link/over.match.viable#3">over.match.viable</A>] paragraph 3 says,</P>

<BLOCKQUOTE>

If the parameter has reference type, the implicit conversion sequence
includes the operation of binding the reference, and the fact that a
reference to non-const cannot be bound to an rvalue can affect the
viability of the function (see 12.2.4.2.5 [<A href="https://wg21.link/over.ics.ref">over.ics.ref</A>]).

</BLOCKQUOTE>

<P>This should say &#8220;lvalue reference to non-const,&#8221; as
is correctly stated in 12.2.4.2.5 [<A href="https://wg21.link/over.ics.ref#3">over.ics.ref</A>] paragraph 3.</P>

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

<P>Change 12.2.3 [<A href="https://wg21.link/over.match.viable#3">over.match.viable</A>] paragraph 3 as follows:</P>

<BLOCKQUOTE>

If the parameter has reference type, the implicit conversion sequence
includes the operation of binding the reference, and the fact that
<DEL>a</DEL> <INS>an lvalue</INS> reference to non-const cannot be
bound to an rvalue can affect the viability of the function (see
12.2.4.2.5 [<A href="https://wg21.link/over.ics.ref">over.ics.ref</A>]).

</BLOCKQUOTE>

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