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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Saturated Math
Date: Sat, 31 May 2003 11:30:38 +0200
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Date: 2003-05-31T11:30:38+02:00
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Marin David Condic wrote:

> Note that you'd also have some problems with assignment because Ada
> doesn't provide a means of overriding it. This is also the area where
> saturation would be the *most* useful.
> 
> Consider that I want to compute some position for an actuator. I don't
> really care if the computation itself is done with infinite precision.
> What I care about is the *result* being limited to within the bounds of
> the actuator. So what I need is saturation on assignment and it would
> also be handy to be able to easily mix it with constants and other
> compatible types. We've done it with home-brewed packages, but it just
> seems to be more clumsy than if it were just a feature of the language.

What about a numeric attribute:

S'Saturate (X : T; L, R : <universal integer>)
   return <universal integer>;

for any subtype S of a floating point T gives X converted to universal 
integer type. The result is always within [L, R].

(What would you do with NaN?)

-- 
Regards,
Dmitry A. Kazakov
www.dmitry-kazakov.de