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    CWG Issue 2405</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="2405"></A><H4>2405.
  
Additional type-dependent expressions
</H4>
<B>Section: </B>13.8.3.3&#160; [<A href="https://wg21.link/temp.dep.expr">temp.dep.expr</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD6
 &#160;&#160;&#160;

 <B>Submitter: </B>Andrey Davydov
 &#160;&#160;&#160;

 <B>Date: </B>2018-08-20<BR>


<P>[Accepted at the July, 2022 meeting.]</P>

<P>According to 13.8.3.3 [<A href="https://wg21.link/temp.dep.expr#3">temp.dep.expr</A>] paragraph 3,</P>

<BLOCKQUOTE>

<P>...Expressions of the
following forms are type-dependent only if the type
specified by
the <I>type-id</I>, <I>simple-type-specifier</I>
or <I>new-type-id</I> is dependent, even if any
subexpression is type-dependent:</P>

<UL>
<I>simple-type-specifier</I> <TT>(</TT> <I>expression-list</I> <TT>)</TT><BR>
<TT>::</TT><SUB><I>opt</I></SUB> <TT>new</TT> <I>new-placement<SUB>opt</SUB> new-type-id new-initializer<SUB>opt</SUB></I><BR>
<TT>::</TT><SUB><I>opt</I></SUB> <TT>new</TT> <I>new-placement<SUB>opt</SUB></I> <TT>(</TT> <I>type-id</I> <TT>)</TT> <I>new-initializer<SUB>opt</SUB></I><BR>
<TT>dynamic_cast &lt;</TT> <I>type-id</I> <TT>&gt; (</TT> <I>expression</I> <TT>)</TT><BR>
<TT>static_cast &lt;</TT> <I>type-id</I> <TT>&gt; (</TT> <I>expression</I> <TT>)</TT><BR>
<TT>const_cast &lt;</TT> <I>type-id</I> <TT>&gt; (</TT> <I>expression</I> <TT>)</TT><BR>
<TT>reinterpret_cast &lt;</TT> <I>type-id</I> <TT>&gt; (</TT> <I>expression</I> <TT>)</TT><BR>
<TT>(</TT> <I>type-id</I> <TT>)</TT> <I>cast-expression</I>
</UL>

</BLOCKQUOTE>

<P>This list is missing cases for:</P>

<UL>
<I>simple-type-specifier braced-init-list</I><BR>
<I>typename-specifier</I> <TT>(</TT> <I>expression-list<SUB>opt</SUB> <TT>)</TT><BR>
<I>typename-specifier braced-init-list</I>
</I>
</UL>

<P><B>Proposed resolution (approved by CWG 2022-06-17): </B></P>

<P>Change in 13.8.3.3 [<A href="https://wg21.link/temp.dep.expr#3">temp.dep.expr</A>] paragraph 3 as follows:</P>

<BLOCKQUOTE>

Expressions of the following forms are type-dependent only if the type
specified by the <I>type-id</I>,
<I>simple-type-specifier</I><INS>, <I>typename-specifier</I>,</INS>
or <I>new-type-id</I> is dependent, even if any subexpression is
type-dependent:

<PRE>
<I>simple-type-specifier</I> ( <I>expression-list</I><SUB>opt</SUB> )
<INS><I>simple-type-specifier</I> <I>braced-init-list</I>
<I>typename-specifier</I> ( <I>expression-list</I><SUB>opt</SUB> )
<I>typename-specifier</I> <I>braced-init-list</I></INS>
...
</PRE>

</BLOCKQUOTE>

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