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    CWG Issue 250</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="250"></A><H4>250.
  
Address of function template specialization with non-deduced template arguments
</H4>
<B>Section: </B>12.3&#160; [<A href="https://wg21.link/over.over">over.over</A>]
 &#160;&#160;&#160;

 <B>Status: </B>TC1
 &#160;&#160;&#160;

 <B>Submitter: </B>Nikolas Kauer
 &#160;&#160;&#160;

 <B>Date: </B>10 Oct 2000<BR>


<P>12.3 [<A href="https://wg21.link/over.over#2">over.over</A>] paragraph 2 says,</P>

<BLOCKQUOTE>

If the name is a function template, template argument deduction is
done (13.10.3.3 [<A href="https://wg21.link/temp.deduct.funcaddr">temp.deduct.funcaddr</A>]), and if the argument
deduction succeeds, the deduced template arguments are used to
generate a single template function, which is added to the set of
overloaded functions considered.

</BLOCKQUOTE>

<P>It is not clear whether this formulation allows explicit
specification of non-deduced template arguments.  For instance,</P>

<PRE>
    template &lt;int I&gt; void f(double x[]);
    typedef void (*FPtr)(double x[]);
    FPtr fp = &amp;f&lt;3&gt;;
</PRE>

<P>If only deduced arguments can be used, this example is
ill-formed.</P>

<P>
<B>Suggested resolution:</B> Clarify 12.3 [<A href="https://wg21.link/over.over#2">over.over</A>] paragraph 2
to allow both deduced and explicitly-specified
template arguments to be used to determine the function template
specialization to be added to the overload set.</P>

<P>(See also issues <A HREF="115.html">115</A> and
<A HREF="214.html">214</A>.)</P>

<P><B>Proposed resolution (10/00):</B></P>

<P>In 12.3 [<A href="https://wg21.link/over.over#2">over.over</A>] paragraph 2, change</P>

<BLOCKQUOTE>

...if the argument deduction succeeds, the deduced template arguments
are used to generate a single template function...

</BLOCKQUOTE>

<P>to</P>

<BLOCKQUOTE>

...if the argument deduction succeeds, the resulting template
argument list is used to generate a single function template
specialization...

</BLOCKQUOTE>

<BR><BR>
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