<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<TITLE>
    CWG Issue 830</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="830"></A><H4>830.
  
Deprecating exception specifications
</H4>
<B>Section: </B>14.5&#160; [<A href="https://wg21.link/except.spec">except.spec</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD2
 &#160;&#160;&#160;

 <B>Submitter: </B>UK
 &#160;&#160;&#160;

 <B>Date: </B>3 March, 2009<BR><BR>


<A href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3086.html#UK136">N2800 comment
  UK&#160;136<BR></A>

<P>[Voted into WP at March, 2010 meeting as paper N3051.]</P>

<P>
Exception specifications have proven close
to worthless in practice, while adding a measurable
overhead to programs. The feature should be deprecated. The
one exception to the rule is the empty throw specification
which could serve a legitimate optimizing role if the
requirement to call <TT>std::unexpected</TT> were
relaxed in this case.
</P>

<P><B>Notes from the July, 2009 meeting:</B></P>

<P>The consensus of the CWG was in favor of deprecating exception
specifications.  Further discussion, and with a wider constituency,
is needed to determine a position on the status of <TT>throw()</TT>.</P>

<P>(See also <A HREF="814.html">issue 814</A>.)</P>

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