I just tried to do this:

class A
{
public:
  template<class T> class X {};
};

and g++ 2.8.0 told me:

invalid member template declaration

Now my questions:

1. Is g++ correct?
2. If yes, why is this illegal? After all, nested classes don't affect
the size of the class, or the size of the virtual function table, so I
don't see any reason for this.
---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]

In article C0F57040@physik.tu-muenchen.de, Christopher Eltschka <celtschk@physik.tu-muenchen.de> writes:
>I just tried to do this:
>
>class A
>{
>public:
>  template<class T> class X {};
>};
>
>and g++ 2.8.0 told me:
>
>invalid member template declaration

The template rules in the ARM allowed a template declaration only
at file scope.

The C++ draft standard allows templates as members of classes, as in
your example, but I don't know of any compilers that fully support the
feature as yet. (Some compilers support it partially.)

---
Steve Clamage, stephen.clamage@sun.com
---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]

Christopher Eltschka wrote:
 >
 > I just tried to do this:
 >
 > class A
 > {
 > public:
 >   template<class T> class X {};
 > };
 >
 > and g++ 2.8.0 told me:
 >
 > invalid member template declaration

The code is correct.  The problem is that g++ 2.8.0 does not support
member class templates.  Only egcs development snapshot supports it.

--Kriang
---
[ comp.std.c++ is moderated.  To submit articles, try just posting with ]
[ your news-reader.  If that fails, use mailto:std-c++@ncar.ucar.edu    ]
[              --- Please see the FAQ before posting. ---               ]
[ FAQ: http://reality.sgi.com/austern_mti/std-c++/faq.html              ]