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    CWG Issue 926</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="926"></A><H4>926.
  
Inline unnamed namespaces
</H4>
<B>Section: </B>9.9.2.2&#160; [<A href="https://wg21.link/namespace.unnamed">namespace.unnamed</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Michael Wong
 &#160;&#160;&#160;

 <B>Date: </B>29 June, 2009<BR>


<P>[Voted into WP at October, 2009 meeting.]</P>

<P>In 9.9.2 [<A href="https://wg21.link/namespace.def#1">namespace.def</A>] paragraph 1, an
<I>unnamed-namespace-definition</I> is defined as</P>

<UL>
<TT>inline</TT><I><SUB>opt</SUB></I><TT> namespace { </TT><I>namespace-body</I><TT> }</TT>
</UL>

<P>However, there is no provision for the <TT>inline</TT> keyword in
the expansion of unnamed namespaces in 9.9.2.2 [<A href="https://wg21.link/namespace.unnamed#1">namespace.unnamed</A>] paragraph 1.
 Strictly interpreted, that would mean that the
<TT>inline</TT> qualifier is ignored for unnamed namespaces.</P>

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

<P>Change 9.9.2.2 [<A href="https://wg21.link/namespace.unnamed#1">namespace.unnamed</A>] paragraph 1 as follows:</P>

<BLOCKQUOTE>

<P>An <I>unnamed-namespace-definition</I> behaves as if it were
replaced by</P>

<PRE>
    <INS>inline<I CLASS="cmnt"><SUB>opt</SUB></I></INS> namespace <I CLASS="cmnt"><B>unique</B></I> { /* empty body */ }
    using namespace <I CLASS="cmnt"><B>unique</B></I> ;
    namespace <I CLASS="cmnt"><B>unique</B></I> { <I CLASS="cmnt">namespace-body</I> }

</PRE>

<P>where <INS><TT>inline</TT> appears if and only if it appears in the
<I>unnamed-namespace-definition</I>, </INS> all occurrences of
<I><B>unique</B></I> in a translation unit are replaced by the same
identifier<INS>,</INS> and this identifier differs from all other
identifiers in the entire program.<SUP>87</SUP>

[<I>Example:</I>...</P>

</BLOCKQUOTE>

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