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    CWG Issue 603</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="603"></A><H4>603.
  
Type equivalence and unsigned overflow
</H4>
<B>Section: </B>13.6&#160; [<A href="https://wg21.link/temp.type">temp.type</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>James Widman
 &#160;&#160;&#160;

 <B>Date: </B>3 November 2006<BR>


<P>[Voted into WP at April, 2007 meeting as part of paper N2258.]</P>



<P>One of the requirements for two <I>template-id</I>s to refer
to the same class or function (13.6 [<A href="https://wg21.link/temp.type#1">temp.type</A>] paragraph 1)
 is that</P>

<UL><LI>their corresponding non-type <I>template-argument</I>s of
integral or enumeration type have identical values</LI></UL>

<P>If we have some template of the form</P>

<PRE>
  template &lt;unsigned char c&gt; struct A;
</PRE>

<P>does this imply that <TT>A&lt;'\001'&gt;</TT> and
<TT>A&lt;257&gt;</TT> (for an eight-bit <TT>char</TT>) refer to
different specializations?</P>

<P>
<U>Jens Maurer</U>: Looks like it should say something like,
&#8220;their corresponding converted non-type template arguments
of integral or enumeration type have identical values.&#8221;</P>

<P><B>Proposed resolution (April, 2007):</B></P>

<P>The change to 13.6 [<A href="https://wg21.link/temp.type#1">temp.type</A>] paragraph 1 shown in
document J16/07-0118 = WG21 N2258, in which the syntactic
non-terminal <I>template-argument</I> is changed to the English
term &#8220;template argument&#8221; is sufficient to remove the
confusion about whether the value before or after conversion is
used in matching <I>template-id</I>s.</P>

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