Re: generic question

[Ludovic Brenta <ludovic@ludovic-brenta.org>]

markww writes:
>     type NODE_REC is
>         record
>             unknown_data_type : generic;  -- not sure how to express
> this in ada
>             Next_Node : NODE_REC_PTR;
>             Prev_Node : NODE_REC_PTR;
>       end record;

generic
   type T is private;
package P is
   type Node;
   type Node_Ptr is access Node;
   type Node is record
      Data : T;
      Prev, Next : Node_Ptr;
   end record;
end P;

HTH

See also the predefined containers, in particular
Ada.Containers.Doubly_Linked_Lists [1]

[1] http://www.adaic.com/standards/05rm/html/RM-A-18-3.html

-- 
Ludovic Brenta.