<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<TITLE>
    CWG Issue 1492</TITLE>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<STYLE TYPE="text/css">
  INS { text-decoration:none; font-weight:bold; background-color:#A0FFA0 }
  .INS { text-decoration:none; background-color:#D0FFD0 }
  DEL { text-decoration:line-through; background-color:#FFA0A0 }
  .DEL { text-decoration:line-through; background-color: #FFD0D0 }
  @media (prefers-color-scheme: dark) {
    HTML { background-color:#202020; color:#f0f0f0; }
    A { color:#5bc0ff; }
    A:visited { color:#c6a8ff; }
    A:hover, a:focus { color:#afd7ff; }
    INS { background-color:#033a16; color:#aff5b4; }
    .INS { background-color: #033a16; }
    DEL { background-color:#67060c; color:#ffdcd7; }
    .DEL { background-color:#67060c; }
  }
  SPAN.cmnt { font-family:Times; font-style:italic }
</STYLE>
</HEAD>
<BODY>
<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="1492"></A><H4>1492.
  
Exception specifications on template destructors
</H4>
<B>Section: </B>11.4.7&#160; [<A href="https://wg21.link/class.dtor">class.dtor</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Jason Merrill
 &#160;&#160;&#160;

 <B>Date: </B>2012-04-01<BR>


<P>[Moved to DR at the November, 2014 meeting.]</P>



<P>According to 11.4.7 [<A href="https://wg21.link/class.dtor#3">class.dtor</A>] paragraph 3,</P>

<BLOCKQUOTE>

A declaration of a destructor that does not have an
<I>exception-specification</I> is implicitly considered to have the
same <I>exception-specification</I> as an implicit declaration
(14.5 [<A href="https://wg21.link/except.spec">except.spec</A>]).

</BLOCKQUOTE>

<P>The implications of this are not clear for the destructor of a
class template. For example,</P>

<PRE>
  template &lt;class T&gt; struct B: T {
    ~B();
  };
  template &lt;class T&gt; B&lt;T&gt;::~B() noexcept {}
</PRE>

<P>The implicit <I>exception-specification</I> of the in-class
declaration of the destructor depends on the characteristics of the
template argument. Does this mean that the out-of-class definition of
the destructor is ill-formed, or will it be ill-formed only in
specializations where the template argument causes the implicit
<I>exception-specification</I> to be other than <TT>noexcept</TT>?</P>

<P><B>Proposed resolution (February, 2014):</B></P>

<P>This issue is resolved by the resolution of
<A HREF="1552.html">issue 1552</A>.</P>

<P><B>Notes from the April, 2013 meeting:</B></P>

<P>This issue was approved as a DR at the April, 2013 (Bristol)
meeting, but it was not noticed that <A HREF="1552.html">issue 1552</A>
was not being moved at that time.  It is being returned to "drafting"
status pending the resolution of that issue.</P>

<BR><BR>
</BODY>
</HTML>
