From: koehnema@enuxsa.eas.asu.edu (Harry Koehnemann)
Subject: Re: Type extension questions
Date: Mon, 27 Mar 1995 17:29:07 GMT
Date: 1995-03-27T17:29:07+00:00 [thread overview]
Message-ID: <D640KK.63D@ennews.eas.asu.edu> (raw)
In-Reply-To: 3l0frd$b9t@lang8.cs.nyu.edu
In article <3l0frd$b9t@lang8.cs.nyu.edu> comar@cs.nyu.edu (Cyrille Comar) writes:
>Don't try to be too close to C++, this doesn't fit Ada's
>model. "Private inheritance" is meaningless in Ada since "Private" is
>a caracteristic of packages and inheritance a characteristic of types
>but you can still do something very close from what you want :
Well, yes and no. What I really want to do is restrict the interface
to a type. It might help to see an example. Let's pretend we have 2
abstract data types, where one is an extension of the other:
class List {
public: Set (...) { ...}
private: ...;
};
class Stack : private List {
public: Push() { ...}
private: ...;
};
It is not appropriate for a Stack to invoke Set. One could argue that
Stack has-a List instead of Stack is-a list (I think Tucker Taft made
this argument earlier). Bottom line - I guess there is no way to
perform private inheritance, as shown in the above example, in Ada95,
which was my question. Thanks for the input.
BTW - I am by no means saying Ada95 should have included such a
feature (in fact, I am not a believer in restricting interfaces and
think that it clutters a design). I'm just getting my Ada95 facts
straight.
next prev parent reply other threads:[~1995-03-27 17:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
1995-03-22 0:25 Type extension questions Harry Koehnemann
1995-03-22 12:01 ` Robb Nebbe
1995-03-23 22:05 ` Harry Koehnemann
1995-03-25 6:59 ` Cyrille Comar
1995-03-25 7:13 ` Cyrille Comar
1995-03-27 0:00 ` Norman H. Cohen
1995-03-30 0:00 ` Cyrille Comar
1995-03-27 17:29 ` Harry Koehnemann [this message]
1995-03-27 20:26 ` Robert I. Eachus
1995-03-29 0:00 ` Harry Koehnemann
1995-03-27 20:37 ` Kennel
1995-03-23 22:03 ` Tucker Taft
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox