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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 21:00:09 +0100
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Date: 2010-10-31T21:00:09+01:00
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On Sun, 31 Oct 2010 16:32:57 +0100, Yannick Duchêne (Hibou57) wrote:

> Le Sun, 31 Oct 2010 16:07:10 +0100, Dmitry A. Kazakov  
> <mailbox@dmitry-kazakov.de> a écrit:
>>> 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].
> Yes, they are also visible, but the visibility you need to have is not the  
> same. Visibility here, does not really mean “what is visible”, instead it  
> means “what needs to viewed”.

This is not in favor of composition, which is less friendly to information
hiding than inheritance.

> With composition, you just need to see the interfaces

You don't have interfaces without inheritance. The very first step of
separation interface from concrete implementation involves two types and a
class of.

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