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    CWG Issue 2163</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="2163"></A><H4>2163.
  
Labels in <TT>constexpr</TT> functions
</H4>
<B>Section: </B>9.2.6&#160; [<A href="https://wg21.link/dcl.constexpr">dcl.constexpr</A>]
 &#160;&#160;&#160;

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

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

 <B>Date: </B>2015-07-24<BR>


<P>[Adopted at the February, 2016 meeting.]</P>



<P>The requirements for <TT>constexpr</TT> functions do not,
but presumably should, forbid the appearance of a label in the
function body (<TT>goto</TT>s are prohibited).</P>

<P><B>Proposed resolution (January, 2016):</B></P>

<P>Add the following as an additional bullet following
9.2.6 [<A href="https://wg21.link/dcl.constexpr#3.5.2">dcl.constexpr</A>] bullet 3.5.2:</P>

<BLOCKQUOTE>

<P>The definition of a <TT>constexpr</TT> function shall satisfy the
following requirements:</P>

<UL>
<LI><P>...</P></LI>

<LI><P>its <I>function-body</I> shall be <TT>=
delete</TT>, <TT>= default</TT>, or
a <I>compound-statement</I> that does not contain</P></LI>

<UL>
<LI><P>an <I>asm-definition</I>,</P></LI>

<LI><P>a <TT>goto</TT> statement,</P></LI>

<LI><P><INS>an identifier label (8.2 [<A href="https://wg21.link/stmt.label">stmt.label</A>]),</INS></P></LI>

<LI><P>...</P></LI>

</UL>

</UL>

</BLOCKQUOTE>

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