Path: utzoo!attcan!uunet!mcvax!ukc!reading!cf-cm!cybaswan!eeartym
From: eeartym@cybaswan.UUCP (Dr R.Artym eleceng )
Newsgroups: comp.lang.c++
Subject: Re: A C++ revelation/question...
Message-ID: <67@cybaswan.UUCP>
Date: 1 Sep 88 21:52:04 GMT
Reply-To: eeartym@cybaswan.UUCP (Dr R.Artym eleceng )
Organization: University College of Swansea
Lines: 34

>>C++ is of course an object-oriented language.  However, some OOL
>>literature makes a subtle distinction between languages that are
>>(truly) "object-based" and those that are "type-based."  The
>> .........

>I dont agree with your terminology ! 
>Sure, Smalltalk is untyped and enforces encapsulation. This does not 
>say anything about whether or how a strongly typed language should 
>enforce encapsulation. Thus the distinction "object based" vs 
>"type based" is misleading.
>

Perhaps Anders Bjornerstedt would be a little happier if the two forms of
OO were called "object-based" and "class-based".  I can see how the term
"type-based" would worry a lot of people, largely owing to the fact that
types tend to be associated with the way variables are used, whereas here
we're talking about visibility within encapsulations (values), and the two
are clearly not the same thing.  Whatever the terminology, no confusion will
result if we keep the word "encapsulation" in there somewhere;  eg. "Smalltalk
is untyped and object-oriented, with object-based encapsulation" is a lot
clearer than "Smalltalk is untyped and type-based" !!!
C++ is, of course, typed and optionally object-oriented, with class-based
encapsulation.
		Rich
-- 
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Keywords:  Parallel, Applicative, and Object-Oriented Languages and Systems
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