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    CWG Issue 2913</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="2913"></A><H4>2913.
  
Grammar for <I>deduction-guide</I> has <I>requires-clause</I> in the wrong position
</H4>
<B>Section: </B>13.7.2.3&#160; [<A href="https://wg21.link/temp.deduct.guide">temp.deduct.guide</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD7
 &#160;&#160;&#160;

 <B>Submitter: </B>Richard Smith
 &#160;&#160;&#160;

 <B>Date: </B>2024-07-17<BR>


<P>[Accepted as a DR at the November, 2024 meeting.]</P>

<P>(From submission
<A HREF="https://github.com/cplusplus/CWG/issues/576">#576</A>.)</P>

<P>
<A HREF="2707.html">Issue 2707</A> added the
missing <I>requires-clause</I> to the grammar
for <I>deduction-guide</I>, but the position is inconsistent with that
of function declarations.</P>

<P><B>Proposed resolution (approved by CWG 2024-08-16):</B></P>

<P>Change in 13.7.2.3 [<A href="https://wg21.link/temp.deduct.guide#1">temp.deduct.guide</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

<PRE>
<I>deduction-guide :
    explicit-specifier<SUB>opt</SUB> template-name</I> ( <I>parameter-declaration-clause</I> ) <I><DEL>requires-clause<SUB>opt</SUB></DEL> -&gt; simple-template-id <INS>requires-clause<SUB>opt</SUB></INS></I> ;
</PRE>

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