template class within another : problem with gcc 3.2.3 on linux (BUG ??)

[corey taylor]

Suresh,

  Can you tell me what the actual gcc error is?

corey

On 6/20/05, Suresh T <suresh.t@philips.com> wrote:
> hi corey,
> 
> >>  What type of objects are contained_size and inner_object?
> 
> Sorry, that was a typo (not in the actual code but in the mail that i
> sent).
> (Instead of putting the actual code, i wanted to put in a short one
> illustrating the problem!!)
> 
> 
> inner_object is an object of  class contained  (which was correct in the
> mail). This is within the  class "enclosing". The "enclosing"
> class has a template parameter  "size" and contained is created using that
> size. WHICH IS WHERE THE PROBLEM ORIGINATES
> as i said in the previos mail.
> 
>       i.e.,  contained<size> inner_object;
> 
> and there was a typo in the  static_cast . It should be :
>           (static_cast<contained <size> >( inner_object) ) .fun_inner();
> 
> 
> I hope i can get some answer as this looks very gcc specific.
> 
> Thanks in  advance
> ---------------------------------------------------------------------------------------------------------
> 
> Warm Regards,
> Suresh.T
> 
> 
> 
> 
> 
> 
> 
>                                                                         To
>                                        Suresh T/BTC/SC/PHILIPS@PHILIPS
>                                                                         cc
>      corey taylor                      gcc-help@gcc.gnu.org
>                                                                    Subject
>      Sent by:                          Re: template class within another :
>      gcc-help-owner@gcc.g              problem with gcc 3.2.3 on linux
>      nu.org                             (BUG ??)
>                                                             Classification
>      06/20/2005 08:17 PM
> 
>       Please respond to
>          corey taylor
>      <corey.taylor@gmail.
>              com>
> 
> 
> 
> 
> 
> 
> Suresh,
> 
>   What type of objects are contained_size and inner_object?
> 
> corey
> 
> On 6/20/05, Suresh T <suresh.t@philips.com> wrote:
> > hi,
> >
> > I need to use a template class object  within another template class.
> > Specifically gcc (3.2.3 on linux) gives me a problem when the INNER
> > TEMPLATE OBJECT IS CREATED USING THE TEMPLATE PARAMETER OF THE ENCLOSING
> > CLASS and when i call the inner class object function from the  enclosing
> > class object function..
> >  AS this works fine in MS VC7 so i wanted to know if this is some bug in
> > gcc
> >
> > Example :
> > In the below example the "enclosing" class contains an object of
> > "contained" class. The  contained object is  created using the
> > template  parameter of "enclosing" class. When the "enclosing" class
> > function is called, we call the function of the inner object.
> >
> > template <std::size_t size>
> > class contained {
> >    public:
> >          template <std::size_t sub_size>
> >          int   func_inner(){   ...  }
> >
> > };
> >
> > template < std::size_t  size>
> > class enclosing {
> >
> >      public:
> >
> >      template <std::size_t sub_size>
> >       int   func_enclose(){   ...
> >
> >            return
> >             (static_cast<contained_size>( inner_object) ) .fun_inner();
> >                                                                        //
> > =================THIS GIVES AN ERROR         ========================
> > MARK1
> >        }
> >
> >       contained<size> inner_object;      //   ============== THIS IS THE
> > ORIGIN OF ERROR ? =====================      MARK2
> >
> > };
> >
> >
> > Note : The error disappears if i use a specific value when creating the
> > inner_object ( MARK 2 above)
> > That is instead of   "contained<size> inner_object" if i use "contained
> <N>
> > inner_object" where N is any number like 32.
> > (Even in that case i need to use a static_cast ( see MARK 1) to remind
> the
> > compiler of the data type of inner_object otherwise
> > the compiler gives an error which i find strange.)
> >
> > I cant use a specific value for the inner object as it should take it
> from
> > the enclosing class template parameter. Since this is
> > not working i would greatly appreciate if someone can tell me whether
> this
> > is a gcc bug or if i need to do something special to let the compiler
> > know what i am trying to do.
> >
> > Thanks &
> >
> ---------------------------------------------------------------------------------------------------------
> 
> >
> > Warm Regards,
> > Suresh.T
> >
> >
> >
> 
> 
>