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    CWG Issue 1995</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="1995"></A><H4>1995.
  
<I>exception-specification</I>s and non-type template parameters
</H4>
<B>Section: </B>14.5&#160; [<A href="https://wg21.link/except.spec">except.spec</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD4
 &#160;&#160;&#160;

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

 <B>Date: </B>2014-09-03<BR>


<P>[Adopted at the October, 2015 meeting as P0012R1.]</P>



<P>In the following example,</P>

<PRE>
   struct A {
     template&lt;class T&gt;
       T foo(T t) noexcept { return t; }
     };

     template&lt;class T, int (T::*fptr)(int)&gt; struct S {
       A a;
       S() noexcept(noexcept((a.*fptr)(1))) {}
     };

     int foo() {
       return noexcept(S&lt;A,&amp;A::foo&gt;());
     }
</PRE>

<P>what should <TT>foo</TT> return?  The question hinges upon whether
the <TT>noexcept</TT> property of the template argument is preserved
or lost in the process of substitution.</P>

<P>See also issues <A HREF="2010.html">2010</A>,
<A HREF="1975.html">1975</A>, <A HREF="1946.html">1946</A>,
and <A HREF="1798.html">1798</A>.</P>

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