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From: Ludovic Brenta <ludovic@ludovic-brenta.org>
Newsgroups: comp.lang.ada
Subject: Re: Initialization of Arrays in Ada
Date: Wed, 24 Feb 2010 13:30:21 -0800 (PST)
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Date: 2010-02-24T13:30:21-08:00
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Ina Drescher 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 ?

Name : String := "Test";

> 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);

This works, and the following works too:

Arr : array (Positive range <>) := (1, 2);

But you should not create anonymous array types like that because that
would prevent you from passing Arr as a parameter to a subprogram.
Instead, you should declare a named type like so:

type A is array (Positive range <>) of Integer; -- named,
unconstrained type
My_Array : A := (1, 2); -- array constrained by its initial value

After that, My_Array is constrained; you cannot change its bounds
anymore; you can only change its contents:

My_Array := (3, 4); -- OK
My_Array := (5, 6, 7); -- Error, My_Array has only 2 components

HTH

--
Ludovic Brenta.