From: William Djaja Tjokroaminata <billtj@...>
Date: 2002-11-12T02:46:20+09:00
Subject: Re: Making Instace Variables Private/Local

Hi Yohanes,

Yohanes Santoso <ysantoso@jenny-gnome.dyndns.org> wrote:

> Well, you could try the untested code below to privatise parent's
> instance variables. You'll need Wayne Conrad's stack frame patch:
> http://yagni.com/stack_frames/index.php

Thanks for the code.

> But, really, humans (programmers) must bear some responsibility. The
> situation is like the interface. You can define interfaces, but those
> who implement them are not guaranteed to give the functionality you
> expect.

> Like (java):

> interface Consume {
> public void eat();
> }

> class Human implements Consume { .... };
> class IOStream implements Consume { ... };

> Both classes implement two methods with the same name, but totally
> different behaviours. So, in the end it's still the programmers'
> responsibility to make things sensible.

I totally agree with you.  I just want the language itself to provide more
protection for the human programmer, especially for the
"innocent/accidental" mistakes.  Just like C++, we have Meyers' "Effective
C++ Ways", but we still can get pointer errors; on the other hand, in Java
there is no way we will get pointer error (in the C sense).  Similarly in
Ruby, if all instance variables are class local/private, then I have one
fewer thing to worry about in a multi-people projects.

Regards,

Bill