Re: [BLACKBOX] foreign COM-objects part 2: inherit multiple interfaces

From: [at]} <Chris>
Date: Sun, 19 Dec 2010 12:21:41 +1030

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>-----Original Message-----
>From: BlackBox [mailto:BLACKBOX{([at]})nowhere.xy
>gunnar bernhardt (VDI)
>Sent: Friday, 17 December 2010 7:06 PM
>To: BLACKBOX{([at]})nowhere.xy
>Subject: [BLACKBOX] foreign COM-objects part 2: inherit
>multiple interfaces
>
>Am I correct that the reason is that Component Pascal as it is
>defined in the Language Report (by Oberon) does not allow to
>inherit from multiple interfaces so there is not easy way to
>circumvent this?
>

Way over my head - but I had a look in Clemens Szyperski's (one of the
co-founders of Oberon microsystems) book "Component Software - Beyond
Object-Oriented Programming"

http://research.microsoft.com/~cszypers/Books/component-software.htm

In a section on multiple inheritance he states "Microsoft COM does not
support multiple interface inheritance, but allows a component to support
multiple interfaces simultaneously, to much the same effect".

His book is worth investigating if you are likely to have a number of
questions of this sort - many of the examples are in Component Pascal as
well.

Regards,
Chris

Chris Burrows
CFB Software
http://www.cfbsoftware.com

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Received on Sun Dec 19 2010 - 02:51:41 UTC