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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Help needed - Upper Bound of an array - Question.
Date: Wed, 8 Feb 2012 21:31:45 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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References: <jgrn33$icp$1@adenine.netfront.net>
 <jgrvc5$243$1@speranza.aioe.org>
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Date: 2012-02-08T21:31:45-06:00
List-Id: <comp.lang.ada>

To correct Tom slightly, this will work when allocated in a package, but 
probably not when allocated in a procedure (like the main subprogram).

For the OP's declaration, allocation on the heap shouldn't be necessary, but 
library-level allocation is a must. (But I have never tried to allocate 
really big objects in GNAT.)

                                   Randy.

<tmoran@acm.org> wrote in message news:jgrvc5$243$1@speranza.aioe.org...
>> >   SUBTYPE Index_30 IS Integer RANGE -500000 .. 500000;
>> >    TYPE I_CoefficientsNumArray IS ARRAY(Index_30) OF Integer;
>> >    I_Num : I_CoefficientsNumArray;
>>
>> Here is a 3rd source of limits on the size of the array: the index 
>> subtype of
>> the array, in this case Index_30. Index_30 has 1_000_001 values, so I_Num 
>> has
>> 1_000_001 components.
>
> The OP is probably using Gnat, with its very limited stack size.  Other
> Ada compilers are not so limited.  Janus, for instance, compiles, and
> runs on an old 3GB 32 bit Windows XP machine:
>
>  type Index_30 is range -100_000_000 .. 100_000_000;
>  type Coefficient_Type is new Interfaces.Unsigned_32;
>  TYPE I_CoefficientsNumArray IS ARRAY(Index_30) OF Coefficient_Type;
>  I_Num : I_CoefficientsNumArray;
>
> which allocates 800,000,004 bytes.