c++/7065: unnamed derived classes/structs are rejected

c++/7065: unnamed derived classes/structs are rejected

[daniel.frey]

>Number:         7065
>Category:       c++
>Synopsis:       unnamed derived classes/structs are rejected
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 18 06:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Daniel Frey
>Release:        gcc-3.1
>Organization:
>Environment:
gcc 3.1, linux, pc
>Description:
The following code is legal:

class A {};
class : A {}; // unnamed class
int main() {}

But it is rejected with:

t.cc:2: parse error before `:' token
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

Re: c++/7065: unnamed derived classes/structs are rejected

[Daniel Frey]

The following reply was made to PR c++/7065; it has been noted by GNATS.

From: Daniel Frey <daniel.frey@aixigo.de>
To: bangerth@dealii.org, daniel.frey@aixigo.de, gcc-bugs@gcc.gnu.org,
	gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c++/7065: unnamed derived classes/structs are rejected
Date: Thu, 23 Jan 2003 09:58:13 +0100

 bangerth@dealii.org wrote:
 > =
 
 > Synopsis: unnamed derived classes/structs are rejected
 > =
 
 > State-Changed-From-To: analyzed->closed
 > State-Changed-By: bangerth
 > State-Changed-When: Thu Jan 23 03:01:31 2003
 > State-Changed-Why:
 >     Fixed with new parser. The only valid use of an unnamed struct
 >     is to either declare a typedef, or to name a variable:
 >     ------------------------
 >     class A {};
 >     typedef class : A {} B;
 >     class : A {} a;
 >     ------------------
 > =
 
 >     Both uses compile just fine now. That being said, what
 >     an abomination of the language!
 
 Indeed. I noticed this problem when compiling code declaring a variable.
 I cut it down to report it to GNATS, but it seems I cut it down too much
 (as the problem with the old parser occured before it saw the variable).
 I consider it fixed now, the example I gave in the original error report
 is clearly illegal. Thanks to the whole GCC team.
 
 Regards, Daniel
 
 -- =
 
 Daniel Frey
 
 aixigo AG - financial training, research and technology
 Schlo=DF-Rahe-Stra=DFe 15, 52072 Aachen, Germany
 fon: +49 (0)241 936737-42, fax: +49 (0)241 936737-99
 eMail: daniel.frey@aixigo.de, web: http://www.aixigo.de

Re: c++/7065: unnamed derived classes/structs are rejected

[bangerth]

Synopsis: unnamed derived classes/structs are rejected

State-Changed-From-To: analyzed->closed
State-Changed-By: bangerth
State-Changed-When: Thu Jan 23 03:01:31 2003
State-Changed-Why:
    Fixed with new parser. The only valid use of an unnamed struct
    is to either declare a typedef, or to name a variable:
    ------------------------
    class A {};
    typedef class : A {} B;
    class : A {} a;
    ------------------
    
    Both uses compile just fine now. That being said, what
    an abomination of the language!
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7065

Re: c++/7065: unnamed derived classes/structs are rejected

[nathan]

Synopsis: unnamed derived classes/structs are rejected

State-Changed-From-To: open->analyzed
State-Changed-By: nathan
State-Changed-When: Wed Jul  3 12:46:57 2002
State-Changed-Why:
    confirmed. Apparently such stupidity is legal!

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7065