• dan (11/11) Jan 10 2004 template< typename Y >
• Matthew (18/29) Jan 10 2004 This is about the least valid error in the business. Check out
• Jonathan Turkanis (16/38) Jan 11 2004 that

dan <dan_member pathlink.com> writes:

template< typename Y >
class x
{
friend class Y;
};

Is an error, but compiles in DM.  Comeau on-line compiler says:

"ComeauTest.c", line 4: error: template parameter "Y" may not be used in an
elaborated type specifier
friend class Y;
^
Cheers!

"Matthew" <matthew.hat stlsoft.dot.org> writes:

 template< typename Y >
 class x
 {
 friend class Y;
 };

 Is an error, but compiles in DM.  Comeau on-line compiler says:

 "ComeauTest.c", line 4: error: template parameter "Y" may not be used in

an
 elaborated type specifier
 friend class Y;
 ^
 Cheers!

This is about the least valid error in the business. Check out
http://www.cuj.com/documents/s=8942/cujweb0312wilson/, and also note that
Comeau have recently added a --friendT option to v4.3.3 to specifically
legalise it when compiling in --strict mode. This behaviour is one of the
one's most likely to
be legalised in the next version of the standard, and is profoundly useful,
so it'd be crazy for any vendor to attempt to change their support for it.

Cheers


-- 
Matthew Wilson

STLSoft moderator (http://www.stlsoft.org)
Contributing editor, C/C++ Users Journal
(www.synesis.com.au/articles.html#columns)

"If I'm curt with you it's because time is a factor. I think fast, I talk
fast, and I need you guys to act fast" -- Mr Wolf

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"Jonathan Turkanis" <technews kangaroologic.com> writes:

"Matthew" <matthew.hat stlsoft.dot.org> wrote in message:
 template< typename Y >
 class x
 {
 friend class Y;
 };

 Is an error, but compiles in DM.  Comeau on-line compiler says:

 "ComeauTest.c", line 4: error: template parameter "Y" may not be


used in
 an
 elaborated type specifier
 friend class Y;
 ^
 Cheers!

 This is about the least valid error in the business. Check out
 http://www.cuj.com/documents/s=8942/cujweb0312wilson/, and also note

that
 Comeau have recently added a --friendT option to v4.3.3 to

specifically
 legalise it when compiling in --strict mode. This behaviour is one

of the
 one's most likely to
 be legalised in the next version of the standard, and is profoundly

useful,
 so it'd be crazy for any vendor to attempt to change their support

for it.
 Cheers

You probably noticed a recent post by Andrei Alexandrescu on
comp.lang.c++.moderated refering to your article. (See
http://www.talkaboutprogramming.com/group/comp.lang.c++.moderated/messages/153854.html.)
He asked "are friend template arguments a de facto feature ready to
make it into the standard?" I was hoping some standards committee
members would respond, but none did.

What is your evidence that this will likely be legalized? I certainly
hope you are right.

Jonathan