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    CWG Issue 421</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="421"></A><H4>421.
  
Is rvalue.field an rvalue?
</H4>
<B>Section: </B>7.6.1.5&#160; [<A href="https://wg21.link/expr.ref">expr.ref</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD1
 &#160;&#160;&#160;

 <B>Submitter: </B>Gabriel Dos Reis
 &#160;&#160;&#160;

 <B>Date: </B>15 June 2003<BR>


<P>[Voted into WP at March 2004 meeting.]</P>



<P>Consider</P>
<PRE>
  typedef
    struct {
      int a;
    } A;

  A f(void)
  {
    A a;
    return a;
  }

  int main(void)
  {
    int* p = &amp;f().a;   // #1
  }
</PRE>
<P>Should #1 be rejected?  The standard is currently silent.</P>

<P>
<U>Mike Miller:</U>
I don't believe the Standard is silent on this.  I will agree that the
wording of 7.6.1.5 [<A href="https://wg21.link/expr.ref#4.2">expr.ref</A>] bullet 4.2 is
unfortunate, as it is subject to misinterpretation.  It reads,
<BLOCKQUOTE>
    If E1 is an lvalue, then E1.E2 is an lvalue.
</BLOCKQUOTE>
The intent is, "and not otherwise." </P>

<P><B>Notes from October 2003 meeting:</B></P>

<P>We agree the reference should be an rvalue, and a change along
the lines of that recommended by Mike Miller is reasonable.</P>

<P><B>Proposed Resolution (October 2003):</B></P>

<P>Change the second bullet of 7.6.1.5 [<A href="https://wg21.link/expr.ref#4">expr.ref</A>] paragraph 4
to read: </P>
<BLOCKQUOTE>
If E1 is an lvalue, then E1.E2 is an lvalue<INS>; otherwise, it is an rvalue</INS>.
</BLOCKQUOTE>

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