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    CWG Issue 345</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="345"></A><H4>345.
  
Misleading comment on example in templates chapter
</H4>
<B>Section: </B>13.8&#160; [<A href="https://wg21.link/temp.res">temp.res</A>]
 &#160;&#160;&#160;

 <B>Status: </B>CD1
 &#160;&#160;&#160;

 <B>Submitter: </B>Jason Shirk
 &#160;&#160;&#160;

 <B>Date: </B>18 March 2002<BR>


<P>[Voted into WP at April 2003 meeting.]</P>



<P>The following example from 13.8 [<A href="https://wg21.link/temp.res#4">temp.res</A>] paragraph 4:</P>
<PRE>
struct A {
	struct X { };
	int X;
};
template&lt;class T&gt; void f(T t) {
	typename T::X x;        //  ill-formed: finds the data member  X
					//  not the member type  X
}
</PRE>

<P>
is not ill-formed.  The intent of the example is obvious, but some
mention should be made that it is only ill-formed when T=A.  For other
T's, it could be well formed.</P>

<P><B>Proposed resolution (October 2002):</B></P>

<P>
In 13.8 [<A href="https://wg21.link/temp.res#4">temp.res</A>] paragraph 4, replace the example with:</P>
<BLOCKQUOTE>
<PRE>
struct A {
  struct X { };
  int X;
} ;
struct B {
  struct X { };
} ;
template&lt;class T&gt; void f(T t) {
  typename T::X x;
}
void foo() {
  A a;
  B b;
  f(b);  // OK -- T::X refers to B::X.
  f(a);  // error: T::X refers to the data member A::X not
         // the struct A::X.
}
</PRE>
</BLOCKQUOTE>

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