Re: Arrays and Access types...

[Jeffrey Carter <jrcarter@acm.org>]

"Eric G. Miller" wrote:
> 
> New to Ada and trying to figure out how to deal with arbitrary
> slices of arrays.  I defined an array type and an access type
> for it, but I can't seem to figure out how to take a slice of
> the array and assign that slice to an access type.
> 
> Type is like:
> 
> type My_Array is array (Positive range <>) of Integer;
> type My_Array_Ref is access My_Array;
> 
> ... in body ...
> 
> left, right, start : My_Array_Ref;
> 
> begin
>     start := new My_Array (1 .. 200);
>     left  := start(start'first .. 100); -- that doesn't work!

I doubt that you really need access types/values at all. Since all the
other responses seem to be overkill, I would suggest something like

   Start : My_Array (1 .. 200);
   ...
begin
   declare 
      Left : [constant] My_Array := Start (Start'First .. 100);
   begin
      ...

-- 
Jeff Carter
"I wave my private parts at your aunties."
Monty Python & the Holy Grail