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From: bill@valiant.gmrc.gecm.com (R.A.L Williams)
Newsgroups: comp.lang.ada
Subject: An observation of Ada (may offend)
Date: 27 Mar 1995 10:38:51 GMT
Organization: GEC-Marconi Research Centre
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Date: 1995-03-27T10:38:51+00:00
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In article <D5Mz8J.AHB@inmet.camb.inmet.com> Tucker Taft wrote:
: R.A.L Williams (bill@valiant.gmrc.gecm.com) wrote:

: : h. And a special one for Ada95: poor encapsulation of objects. I can
: : define a 'member function' for a class by including the class in the
: : parameter list. Unlike C++ or Eiffel, I can do this *anywhere* in my code,
: : even a nested function hidden somewhere seemingly 'irrelevant'. Whereas
: : other features of Ada go out of their way to force the programmer to
: : follow 'good practice' (sometimes a matter of opinion), this seems
: : very lax.

: What are called "methods" in some OOPs are called "primitive 
: operations" or "dispatching operations" in Ada 95.  These 
: may be defined *only* immediately within the same package
: spec as the type.  (If a type extension is declared in a package body or
: declarative part, you can override inherited primtive ops there -- and
: only there -- for that typ extension, but you can't define any new ones.)

: So I don't think Ada 95 suffers from the above problem.  Perhaps
: you were referring to something else, but I can't quite imagine what
: problem it would be.  An example might help.  We certainly never meant
: for Ada 95 to be "lax" ;-).

No, that's what I was referring to. All I can do is apologise for activating
fingers without previously engaging brain. I hadn't spotted that in the LRM
and I never tried to do anything differently because, well, its not nice!

The sooner someone comes out with a really good text book for Ada 95 so
I can stop making boo-boos like this the better!

: -Tucker Taft  stt@inmet.com
: Intermetrics, Inc.

Bill Williams
bill.williams@gec-mrc.co.uk