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    CWG Issue 1233</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="1233"></A><H4>1233.
  
Pack expansions and dependent calls
</H4>
<B>Section: </B>13.8.3&#160; [<A href="https://wg21.link/temp.dep">temp.dep</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>John Spicer
 &#160;&#160;&#160;

 <B>Date: </B>2011-01-11<BR>


<P>[Voted into the WP at the March, 2011 meeting as part of paper N3262.]</P>

<P>In an example like</P>

<PRE>
  void f(int, int, int);
  template&lt;int ...N&gt; void g() {
    f((N+N)...);
  }
  void h() {
    g&lt;1, 2, 3&gt;();
  }
</PRE>

<P>the call to <TT>f</TT> needs to be dependent; however, the arguments
are not type-dependent, so the criteria of 13.8.3 [<A href="https://wg21.link/temp.dep#1">temp.dep</A>] paragraph 1
are not met.  Presumably the specification needs to be
updated so that an argument list containing a type-level pack expansion
is dependent.</P>

<BR><BR>
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