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Given:

template<typename T,typename U> class C { };
template<typename T> typedef C<T,int> C2;

I get:

test.cpp:2: error: template declaration of 'typedef'

Are template typedefs still not supported in g++ 4.1.2?

- Paul

Paul J. Lucas wrote:
> Given:
>
> template<typename T,typename U> class C { };
> template<typename T> typedef C<T,int> C2;
>
> I get:
>
> test.cpp:2: error: template declaration of 'typedef'
>
> Are template typedefs still not supported in g++ 4.1.2?

There are no template typedefs in C++... As to g++ extensions,
you should ask in 'gnu.g++.*' newsgroup hierarchy.

V
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On Mar 6, 3:01 pm, pauljlucas.removet...@removethistoo.mac.com (Paul
J. Lucas) wrote:
> Given:
>
> template<typename T,typename U> class C { };
> template<typename T> typedef C<T,int> C2;
>
> I get:
>
> test.cpp:2: error: template declaration of 'typedef'
>
> Are template typedefs still not supported in g++ 4.1.2?
>
> - Paul

Maybe what you wanted is this?

template<typename T,typename U> class C { };
typedef C<T,int> C2;


Adrian

wrote:
> On Mar 6, 3:01 pm, pauljlucas.removet...@removethistoo.mac.com (Paul
> J. Lucas) wrote:
>> Given:
>>
>> template<typename T,typename U> class C { };
>> template<typename T> typedef C<T,int> C2;
>>
>> I get:
>>
>> test.cpp:2: error: template declaration of 'typedef'
>>
>> Are template typedefs still not supported in g++ 4.1.2?
>>
>> - Paul
>
> Maybe what you wanted is this?
>
> template<typename T,typename U> class C { };
> typedef C<T,int> C2;

'T' seems undefined here. What does your compiler say?

V
--
Please remove capital 'A's when replying by e-mail
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On Mar 6, 5:44 pm, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
> adrian.hawry...@gmail.com wrote:
> > On Mar 6, 3:01 pm, pauljlucas.removet...@removethistoo.mac.com (Paul
> > J. Lucas) wrote:
> >> Given:
>
> >> template<typename T,typename U> class C { };
> >> template<typename T> typedef C<T,int> C2;
>
> >> I get:
>
> >> test.cpp:2: error: template declaration of 'typedef'
>
> >> Are template typedefs still not supported in g++ 4.1.2?
>
> >> - Paul
>
> > Maybe what you wanted is this?
>
> > template<typename T,typename U> class C { };
> > typedef C<T,int> C2;
>
> 'T' seems undefined here. What does your compiler say?
>
> V
> --
> Please remove capital 'A's when replying by e-mail
> I do not respond to top-posted replies, please don't ask

Oh, I see. I was some how combining Partial Template Specialization
with typedefing a concrete class. Doh!

I wonder what the reasoning is for no templated typedefs. Seems like
a natural extention.


Adrian

Paul J. Lucas wrote:
> Given:
>
> template<typename T,typename U> class C { };
> template<typename T> typedef C<T,int> C2;
>
> I get:
>
> test.cpp:2: error: template declaration of 'typedef'
>
> Are template typedefs still not supported in g++ 4.1.2?
>
> - Paul
Hi Paul,

At best, if GNU does support this you will probably need to
download an experimental g++ for this. You can check on their
website to see if this is something they do plan to support.

From a C++ standards perspective, I do not think it has been
ratified. I tried to search the C++ standards website for any
information about this issue but I could not find anything
(but does not mean it isn't being addressed).

Here is a suggested workaround while the different groups
address this issue.

template<typename T,typename U> class C { };
template<typename T>
class C2
{
public:
typedef C<T,int> Type;
};

So now you can do this:

C2<double>::Type foo;

A little awkward looking but should hold you out until
typedef templates is addressed (typedef templates is how
it is referred to by Vandevoorde and Josuttis).

HTH