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    CWG Issue 2385</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="2385"></A><H4>2385.
  
Lookup for <I>conversion-function-id</I>s
</H4>
<B>Section: </B>7.5.5.3&#160; [<A href="https://wg21.link/expr.prim.id.qual">expr.prim.id.qual</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD5
 &#160;&#160;&#160;

 <B>Submitter: </B>John Spicer
 &#160;&#160;&#160;

 <B>Date: </B>2018-07-31<BR>


<P>[Accepted as a DR at the February, 2019 meeting.]</P>

<P>According to 7.5.5.3 [<A href="https://wg21.link/expr.prim.id.qual#5">expr.prim.id.qual</A>] paragraph 5,</P>

<BLOCKQUOTE>

In a <I>qualified-id</I>, if the <I>unqualified-id</I> is
a <I>conversion-function-id</I>, its <I>conversion-type-id</I> shall denote
the same type in both the context in which the entire <I>qualified-id</I>
occurs and in the context of the class denoted by
the <I>nested-name-specifier</I>.

</BLOCKQUOTE>

<P>However, _N4868_.6.5.6 [<A href="https://wg21.link/basic.lookup.classref#7">basic.lookup.classref</A>] paragraph 7 says,</P>

<BLOCKQUOTE>

If the <I>id-expression</I> is a <I>conversion-function-id</I>,
its <I>conversion-type-id</I> is first looked up in the class of the object
expression and the name, if found, is used. Otherwise it is looked up in
the context of the entire <I>postfix-expression</I>. In each of these
lookups, only names that denote types or templates whose specializations
are types are considered.

</BLOCKQUOTE>

<P>The latter was changed by <A HREF="1111.html">issue 1111</A>. It
seems the former may have been overlooked in that change.</P>

<P><B>Proposed resolution (February, 2019):</B></P>

<P>Change 7.5.5.3 [<A href="https://wg21.link/expr.prim.id.qual#4">expr.prim.id.qual</A>] paragraph 4 as follows:</P>

<BLOCKQUOTE>

In a <I>qualified-id</I>, if the <I>unqualified-id</I> is
a <I>conversion-function-id</I>,
its <I>conversion-type-id</I> <DEL>shall denote the same type in
both the context in which the entire <I>qualified-id</I>
occurs and in the context of the class denoted by
the <I>nested-name-specifier</I></DEL>
<INS>is first looked up in the class denoted by the
<I>nested-name-specifier</I> of the <I>qualified-id</I> and
the name, if found, is used. Otherwise, it is looked up
in the context in which the entire <I>qualified-id</I>
occurs. In each of these lookups, only names that denote types
or templates whose specializations are types are considered</INS>.

</BLOCKQUOTE>

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