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Date: Tue, 12 Mar 2013 19:04:31 +0100
From: Georg Bauhaus <rm.dash-bauhaus@futureapps.de>
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Subject: Re: Is this expected behavior or not
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Date: 2013-03-12T19:04:31+01:00
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On 12.03.13 18:42, Dmitry A. Kazakov wrote:
> On Tue, 12 Mar 2013 13:19:06 -0400, Robert A Duff wrote:
> 
>> > "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:
>> > 
>>> >> The semantics of 'Pred and 'Succ shall be properly defined in terms of
>>> >> convariance of the argument and the result. There are arguments for and
>>> >> against contravariant results. It goes straight to the circle-ellipse
>>> >> controversy.
>> > 
>> > The profile of 'Succ is given in RM-3.5(23):
>> > 
>> >     function S'Succ (Arg: S'Base) return S'Base;
>> > 
>> > It's neither contravariant nor covariant -- it's invariant.
> Invariant = contravariant.

In Ada? For non-tagged types?