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From: Guillaume Foliard <guifo@wanadoo.fr>
Newsgroups: comp.lang.ada
Subject: Type inference in loops with immediate constants
Date: Wed, 25 Jun 2003 22:54:02 +0200
Organization: Old Europe
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Date: 2003-06-25T20:54:03+00:00
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Hi,

I'm currently chasing down a Constraint_Error exception and while I was
reading one loop statement I wondered about the type inference in such a
place. Here is the snippet :

---

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 ?

-- 
Guillaume