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    CWG Issue 965</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="965"></A><H4>965.
  
Limiting the applicability of the <TT>carries_dependency</TT> attribute
</H4>
<B>Section: </B>_N5001_.9.12.4&#160; [<A href="https://wg21.link/dcl.attr.depend">dcl.attr.depend</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Daveed Vandevoorde
 &#160;&#160;&#160;

 <B>Date: </B>15 September, 2009<BR>


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



<P>The current wording for the <TT>carries_dependency</TT> attribute
does not limit it to value-returning functions (when applied to the
<I>declarator-id</I>, indicating that the return value is affected),
nor does it prohibit use in the declaration of a typedef or function
pointer.  Arguably these meaningless declarations should be
prohibited.</P>

<P><B>Proposed resolution (October, 2009):</B></P>

<P>Change _N5001_.9.12.4 [<A href="https://wg21.link/dcl.attr.depend#1">dcl.attr.depend</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

...The attribute applies to the <I>declarator-id</I> of a
<I>parameter-declaration</I> <INS>in a function declaration or
lambda</INS>, in which case it specifies that the initialization of
the parameter carries a dependency to (6.10.2 [<A href="https://wg21.link/intro.multithread">intro.multithread</A>]) each
lvalue-to-rvalue conversion (7.3.2 [<A href="https://wg21.link/conv.lval">conv.lval</A>]) of that
object. The attribute also applies to the
<I>declarator-id</I> of a function declaration, in which case it
specifies that the return value<INS>, if any,</INS> carries a
dependency to the evaluation of the function call expression.

</BLOCKQUOTE>

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