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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: How to avoid unreferenced objects (mutexes etc)
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Date: Wed, 16 Jan 2002 20:28:35 GMT
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Date: 2002-01-16T20:28:35+00:00
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dmitry@elros.cbb-automation.de (Dmitry A. Kazakov) writes:

> However, I always wished Ada having an ability to disallow primitive
> operations. Like:
> 
> type Unordered is new Integer;
> function ">" (Left, Right : Unordered) is abstract; -- Disallow ">"

Umm, isn't that legal?  And does it not disallow calls to ">"?
Of course, it's a pain to list all the operations you *don't*
want -- I'd rather it be the other way 'round.

> The difference is that with a driver you always know the interface:
> Open/Read/Write/Close.

And ioctl, which is 37-to-50 different operations wrapped up in one,
different for each driver.  ;-)

- Bob