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Newsgroups: comp.lang.ada
Path: sparky!uunet!pipex!sunic!news.lth.se!dag
From: dag@control.lth.se (Dag Bruck)
Subject: Re: Encapsulation in Ada vs. C++ (Was Re: Ichibah [sic] ...)
Message-ID: <1993Mar16.063423.4679@lth.se>
Sender: news@lth.se
Organization: Department of Automatic Control, Lund, Sweden
References: <1993Mar7.191557.5547@evb.com>
 <1993Mar8.153639.3603@inmet.camb.inmet.com>
 <1993Mar9.181231.27197@intellistor.com> <1993Mar11.082214@lglsun.epfl.ch>
Date: Tue, 16 Mar 1993 06:34:23 GMT
Date: 1993-03-16T06:34:23+00:00
List-Id: <comp.lang.ada>

In <comp.lang.ada> magnus@lglsun.epfl.ch (Magnus Kempe) writes:
>
>To achieve this, operators would have to be "friends" in C++,
>because of its equation "module = class"; however, the problem
>with such an approach is that _anyone_ can then claim to be a
>"friend", and therefore _anyone_ can break the abstraction of
>the class.

This is incorrect.

A class grants friendship to other functions or classes, which means
that the author of a class controls who gets access to the private
members of the class.  You cannot grant yourself access to any random
class.

			-- Dag Bruck