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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Do people who use Ada also use ocaml or F#?
Newsgroups: comp.lang.ada
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Date: Sun, 31 Oct 2010 16:07:10 +0100
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Date: 2010-10-31T16:07:11+01:00
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On Sun, 31 Oct 2010 13:51:16 +0100, J-P. Rosen wrote:

> Le 31/10/2010 12:17, Dmitry A. Kazakov a �crit :
>> Maybe two-tier "assemble" design works for small throw-away projects, but
>> in Ada I would rather expect components combined into new components, i.e.
>> extended, if not functionally, then by aggregation.
>> 
> You can build new components that use other components, hence you can
> call it aggregation, but this is hidden in the body, so nobody cares,
> it's not visible; unlike inheritance where the whole dependency has to
> be visible.

But reusable components are visible as well, e.g. a list [component 1] of
arrays [component 2] of something [component 3].

> That's why I claim that components are superior, because you never need
> to be aware of more than one level.

Flatten hierarchies are not always good. Example: String vs.
Unbounded_String vs. Bounded string x single vs. wide vs. wide_wide =
geometric explosion of packages all over Ada standard library.

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