Re: Slices of 2d arrays?

[Peter Hermann <ica2ph@iris16.csv.ica.uni-stuttgart.de>]

Dale Stanbrough <dstanbro@bigpond.net.au> wrote:
> I've always been under the impression that you could take a 
> horizontal slice of a 2d array, but for the life of me I can't
> find it in the LRM, or get it to work. Does anyone know
> whether this exists, or is it just a figment of my overworked 
> imagination?

imagination is always a fine thing

> I would like to be able to do...
>    type grid is array (1..10, 1..10) of character;
>    g : grid;
>    ...
>    put (g (1, 4..5));

Apart from the pragmatic solution (as Pascal Obry already proposed)
for your special case:
    subtype s10 is string(1..10);
    type grid is array(1..10) of s10;
    begin
    g(1)(1) := 'x';

there may be an incentive for Ada2005 thoughts on index ranges
in place of index position. I can not oversee all the implications
which a language lawyer may see.  Important may be the aspect:
   g(1   ,4   ) is of type character
   g(1..1,4..5) is of type grid
   g(1   ,4..5) is of type grid slice?
   g(1..1,4   ) is of type grid slice?
   and the n-dimensional arrays?

No.   Language designers will certainly refusei, IMHO.

-- 
--Peter Hermann(49)0711-685-3611 fax3758 ica2ph@csv.ica.uni-stuttgart.de
--Pfaffenwaldring 27 Raum 114, D-70569 Stuttgart Uni Computeranwendungen
--http://www.csv.ica.uni-stuttgart.de/homes/ph/
--Team Ada: "C'mon people let the world begin" (Paul McCartney)