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From: christoph.grein@eurocopter.com
Newsgroups: comp.lang.ada
Subject: Re: Type inference in loops with immediate constants
Date: Thu, 26 Jun 2003 08:18:49 +0200 (MET DST)
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Date: 2003-06-26T08:18:49+02:00

> Length : Positive; -- reminder : subtype Integer range 1 .. Integer'Last
>
> for Index in 0 .. Length - 1 loop
>
> ---
>
> Then what type Index should be ?
>
> Positive ?
>
> Obviously not, because of the 0, which is not a Positive, as a starting
> value.
>
> Integer ?
>
> Is the compiler using the fact that a positive is derived from an universal
> integer and thus decides to give the base type to the loop variable ?

Note that Positive is not a type, but a subtype of Integer. So Index is of type 
Integer with a constraint of 0 .. Length -1.