Re: Initialization of Arrays in Ada

[sjw <simon.j.wright@mac.com>]

On Feb 24, 9:11 pm, Ina Drescher <ina.drescher.1...@googlemail.com>
wrote:
> Hi Ada Users,
>
> I have a question concerning the initialization of an array in Ada.
>
> For instance I have sth. like this:
>
> arr : Array (Integer Range<>) of Integer:=(1=>1, 2=>2);
>
> I just want to leave out the 1=> 2=> ...
>
> Is there any way like declating undefinite range arrays that ada does
> the counting work:
>
> In C in know this would be like this:
>
> char name[]="Test" and the compiler counts the number of characters.
>
> How is this done in Ada ?
> I know it's possible to count the number of entries for myself and
> then I could eliminate the 1=> ... so that it will look like this:
>
> arr : Array (Integer Range 1..2) of Integer:=(1, 2);

You might declare the array type first:

   type Integer_Array is array (Integer range <>) of Integer;

   Arr : Integer_Array := (1 => 1, 2 => 2);

(if you don't do this, you'll have trouble passing Arr to
subprograms).

You can also write

   Arr : Integer_Array := (1, 2);

but then the indices of Arr are -2147483648 .. -2147483647 (ie, start
at Integer'First. Not sure if this is mandated behaviour -- probably
-- or just the way GNAT works ...)