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    CWG Issue 1047</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>
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<A NAME="1047"></A><H4>1047.
  
When is <TT>typeid</TT> value-dependent?
</H4>
<B>Section: </B>13.8.3.4&#160; [<A href="https://wg21.link/temp.dep.constexpr">temp.dep.constexpr</A>]
 &#160;&#160;&#160;

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

 <B>Submitter: </B>Steve Adamczyk
 &#160;&#160;&#160;

 <B>Date: </B>2010-03-08<BR>


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

<P>The Standard should, but does not currently, say that <TT>typeid</TT>
is value-dependent if its expression or type is type-dependent.</P>

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

<P>Change 13.8.3.4 [<A href="https://wg21.link/temp.dep.constexpr#2">temp.dep.constexpr</A>] paragraph 2 as follows:</P>

<BLOCKQUOTE>

<P>...Expressions of the following form are value-dependent if the
<I>unary-expression</I> or <I>expression</I> is type-dependent or the
<I>type-id</I> is dependent:</P>

<UL>
<TT>sizeof</TT> <I>unary-expression</I><BR>

<TT>sizeof (</TT> <I>type-id</I> <TT>)</TT><BR>

<INS><TT>typeid (</TT> <I>expression</I> <TT>)</TT></INS><BR>

<INS><TT>typeid (</TT> <I>type-id</I> <TT>)</TT></INS><BR>

<TT>alignof (</TT> <I>type-id</I> <TT>)</TT><BR>

<TT>noexcept (</TT> <I>expression</I> <TT>)</TT>
</UL>

</BLOCKQUOTE>

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