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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Derived private interface
Date: Sat, 9 Jul 2011 08:14:43 +0200
Organization: cbb software GmbH
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Date: 2011-07-09T08:14:43+02:00
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On Fri, 08 Jul 2011 14:41:05 -0700, Jeffrey Carter wrote:

> On 07/08/2011 12:23 PM, Randy Brukardt wrote:
>>
>> This particular problem has no workaround...
> 
> I disagree. The use of programming by composition is an effective work around to 
> all the problems introduced by programming by extension.

Nope, composition would violate the information hiding principle.

There is no workarounds to establishing a relationship between two types
serving as separate implementations of the *same* abstract concept (except
for generics or overloading (static and ad-hoc polymorphism). Both have
serious problems especially in the context of large systems design.

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