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    CWG Issue 1069</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="1069"></A><H4>1069.
  
Incorrect function type with <I>trailing-return-type</I>
</H4>
<B>Section: </B>9.3.4.6&#160; [<A href="https://wg21.link/dcl.fct">dcl.fct</A>]
 &#160;&#160;&#160;

 <B>Status: </B>C++11
 &#160;&#160;&#160;

 <B>Submitter: </B>James Widman
 &#160;&#160;&#160;

 <B>Date: </B>2010-04-30<BR>


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



<P>In 9.3.4.6 [<A href="https://wg21.link/dcl.fct#2">dcl.fct</A>] paragraph 2, the type of a function
declarator with a <I>trailing-return-type</I> is said to be</P>

<BLOCKQUOTE>

&#8220;function of (<I>parameter-declaration-clause</I>)
<I>cv-qualifier-seq<SUB>opt</SUB> ref-qualifier<SUB>opt</SUB></I>
returning <I>type-id</I>&#8221;.

</BLOCKQUOTE>

<P>This formulation incorrectly omits the
<I>derived-declarator-type-list</I> modifier for the type, and it
should refer to &#8220;the <I>trailing-type-specifier-seq</I> of the
<I>trailing-return-type</I>&#8221; as the return type instead of
<I>type-id</I> (which is left over from before the introduction
of <I>trailing-return-type</I>).</P>

<P><B>Proposed resolution (September, 2010):</B></P>

<P>Change 9.3.4.6 [<A href="https://wg21.link/dcl.fct#2">dcl.fct</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

...<TT>T</TT> shall be the single <I>type-specifier</I> <TT>auto</TT>.
The type of the <I>declarator-id</I> in <TT>D</TT> is
&#8220;<INS><I>derived-declarator-type-list</I></INS> function of
(<I>parameter-declaration-clause</I>)
<I>cv-qualifier-seq<SUB>opt</SUB> ref-qualifier<SUB>opt</SUB></I>
returning <I><DEL>type-id</DEL>
<INS>trailing-return-type</INS></I>&#8221;.  The optional...

</BLOCKQUOTE>

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