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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Rational for not making cursor tagged in Containers
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Date: Sat, 21 Apr 2007 00:14:44 +0200
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On Fri, 20 Apr 2007 16:59:02 -0400, Robert A Duff wrote:

> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>
>> Discriminants make sense for ANY type, be it record or Boolean.
> 
> Then we at least agree that they make sense for any composite type.

Yes.
 
> But please explain what use is a Boolean with discriminants.
> I'm not sure...

   type GUI_Boolean (Defined : Boolean := True) is (False, True);

When Defined = False, the value is rendered as blank and the user is forced
to enter it before it closes the dialog box.

(It is different from tri-state logical value (False, True, Uncertain),
because Defined describes the value itself, while Uncertain is just a value
among others.)

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de