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    CWG Issue 964</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="964"></A><H4>964.
  
Incorrect description of when the lvalue-to-rvalue conversion applies
</H4>
<B>Section: </B>7.2.1&#160; [<A href="https://wg21.link/basic.lval">basic.lval</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Doug Gregor
 &#160;&#160;&#160;

 <B>Date: </B>14 September, 2009<BR>


<P>[Voted into the WP at the November, 2010 meeting.]</P>



<P>7.2.1 [<A href="https://wg21.link/basic.lval#7">basic.lval</A>] paragraph 7 says,</P>

<BLOCKQUOTE>

Whenever an lvalue appears in a context where an rvalue is expected,
the lvalue is converted to an rvalue

</BLOCKQUOTE>

<P>That is not correct in the context of an attempt to bind an
rvalue reference to an lvalue (9.5.4 [<A href="https://wg21.link/dcl.init.ref">dcl.init.ref</A>]).</P>

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

<P>Change 7.2.1 [<A href="https://wg21.link/basic.lval#7">basic.lval</A>] paragraph 7 as follows:</P>

<BLOCKQUOTE>

Whenever an lvalue appears in a context where an rvalue is expected
<INS>and an lvalue is not explicitly prohibited (as, for example, in
9.5.4 [<A href="https://wg21.link/dcl.init.ref">dcl.init.ref</A>])</INS>, <DEL>the lvalue</DEL> <INS>it</INS>
is converted to an rvalue; see 7.3.2 [<A href="https://wg21.link/conv.lval">conv.lval</A>], 7.3.3 [<A href="https://wg21.link/conv.array">conv.array</A>], and 7.3.4 [<A href="https://wg21.link/conv.func">conv.func</A>].

</BLOCKQUOTE>

<P><B>Notes from the March, 2010 meeting:</B></P>

<P>This resolution needs to be reconsidered in light of the new
expression taxonomy.</P>

<P><B>Proposed resolution (September, 2010):</B></P>

<P>Change 7.2.1 [<A href="https://wg21.link/basic.lval#2">basic.lval</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

Whenever a glvalue appears in a context where a prvalue is expected,
the glvalue is converted to a prvalue; see 7.3.2 [<A href="https://wg21.link/conv.lval">conv.lval</A>],
7.3.3 [<A href="https://wg21.link/conv.array">conv.array</A>], and 7.3.4 [<A href="https://wg21.link/conv.func">conv.func</A>].
<INS>[<I>Note:</I> An attempt to bind an rvalue reference to an lvalue
is not such a context; see 9.5.4 [<A href="https://wg21.link/dcl.init.ref">dcl.init.ref</A>]. &#8212;<I>end
note</I>]</INS>

</BLOCKQUOTE>


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