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Date: Wed, 25 Mar 2009 17:52:53 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: Ada-Singleton-Why does it work like this?
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Date: 2009-03-25T17:52:53+01:00
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patrick.gunia@googlemail.com schrieb:

> because the package body knows the concrete structure of my
> Singleton_Type, it also knows that a discriminant is not defined and
> thus not necessary for creating new variables of my type. That is why I
> �m able to create a Singleton instance within the package body. Is
> this right? If so, then I finally got it...


Almost, yes. The full view of the type in the
private part may have _known_ discriminants.
(It may have zero or more discriminants.)
If it has one you can create objects of the type
just as well because you can supply a value for the
discriminant, thereby adding the necessary constraint.

package body ...

   Var: T(Some_Dicriminant => 10);