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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: A new notion: stronglly-typed-by-user language
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Date: Sat, 17 Apr 2010 16:09:24 +0200
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Date: 2010-04-17T16:09:23+02:00
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On Sat, 17 Apr 2010 13:40:23 +0200, J-P. Rosen wrote:

> My point is that two objects are of the same type if they represent the
> same abstraction. This is true of T and T'Base.

No, this is certainly untrue. T'Base rather represents a quite arbitrary
machine-dependent type chosen by the compiler. It may or may not fir the
abstraction of T. Consider:

   type Angle is digits 5 range 0.0..360.0;
   X : Angle'Base := -10.0;

Putting or lifting a constraint can break abstraction.

> Almost any language
> behaves as if there were only one integer type (represented on various
> number of bits depending on the constraints). This is somehow the
> mathematical view. But since we are modelling real world object, it is
> better to adopt a physicist point of view: objects have dimensions, and
> it makes no sense to add apples and oranges. That's what I would call
> strong typing.

I would call it mere typing. Strength of typing to me rather indicates how
often you get a chance to add apples and orange. It is more frequent in C++
than in Ada.

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