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    CWG Issue 1600</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="1600"></A><H4>1600.
  
Erroneous reference initialization in example
</H4>
<B>Section: </B>9.2.9.3&#160; [<A href="https://wg21.link/dcl.type.simple">dcl.type.simple</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD4
 &#160;&#160;&#160;

 <B>Submitter: </B>Niels Dekker
 &#160;&#160;&#160;

 <B>Date: </B>2012-12-30<BR>


<P>[Moved to DR at the November, 2014 meeting.]</P>



<P>The example in 9.2.9.3 [<A href="https://wg21.link/dcl.type.simple#4">dcl.type.simple</A>] paragraph 4 reads,
in part,</P>

<PRE>
  const int&amp;&amp; foo();
  int i;
  decltype(foo()) x1 = i; //<SPAN CLASS="cmnt"> type is </SPAN>const int&amp;&amp;
</PRE>

<P>The initialization is an ill-formed attempt to bind an rvalue
reference to an lvalue.</P>

<P><B>Proposed resolution (April, 2013):</B></P>

<P>Change the example in 9.2.9.3 [<A href="https://wg21.link/dcl.type.simple#4">dcl.type.simple</A>] paragraph 4 as follows:</P>

<PRE>
  const int&amp;&amp; foo();
  int i;
  struct A { double x; };
  const A* a = new A();
  decltype(foo()) x1 = <DEL>i</DEL> <INS>17</INS>;     //<SPAN CLASS="cmnt"> type is </SPAN>const int&amp;&amp;
  decltype(i) x2;                //<SPAN CLASS="cmnt"> type is </SPAN>int
  decltype(a-&gt;x) x3;             //<SPAN CLASS="cmnt"> type is </SPAN>double
  decltype((a-&gt;x)) x4 = x3;      //<SPAN CLASS="cmnt"> type is </SPAN>const double&amp;
</PRE>

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