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    CWG Issue 2100</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="2100"></A><H4>2100.
  
Value-dependent address of static data member of class template
</H4>
<B>Section: </B>13.8.3.4&#160; [<A href="https://wg21.link/temp.dep.constexpr">temp.dep.constexpr</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++17
 &#160;&#160;&#160;

 <B>Submitter: </B>Richard Smith
 &#160;&#160;&#160;

 <B>Date: </B>2015-03-16<BR>


<P>[Moved to DR at the November, 2016 meeting.]</P>



<P>According to bullet 2.4 of 13.8.3.4 [<A href="https://wg21.link/temp.dep.constexpr">temp.dep.constexpr</A>], an
<I>id-expression</I> is value-dependent if</P>

<UL><LI><P>it names a static data member that is a dependent
member of the current instantiation and is not initialized
in a <I>member-declarator</I>,</P></LI></UL>

<P>This implies that the address of an initialized static data
member is not value-dependent, which is incorrect.</P>

<P><B>Proposed resolution (June, 2016):</B></P>

<P>Change 13.8.3.4 [<A href="https://wg21.link/temp.dep.constexpr#5">temp.dep.constexpr</A>] paragraph 5 as follows:</P>

<BLOCKQUOTE>

<P>An expression of the form <TT>&amp;</TT><I>qualified-id</I> where
the <I>qualified-id</I> names a dependent member of the current
instantiation is value-dependent. <INS>An expression of the form</INS>
</P>

<UL><INS><TT>&amp;</TT><I>cast-expression</I></INS></UL>

<P><INS>is also value-dependent if evaluating <I>cast-expression</I> as a
core constant expression (7.7 [<A href="https://wg21.link/expr.const">expr.const</A>]) succeeds and the
result of the evaluation refers to a templated entity that is an object
with static or thread storage duration or a member function.</INS></P>

</BLOCKQUOTE>

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