From: Chochain Lee <cclee@...>
Date: 2001-05-07T09:40:09+09:00
Subject: [ruby-talk:14750] Re: Class refresher please.

Hi, 

Though my question could go to a separate thread but since we're on the 
topic of 'Ruby is dynamic', let's check whether my assumption is correct. 

If a instance variable is created at run-time, there can be no
instance variable with the same name in both sub-class and super-class. 
Because they could share the same space. I.e. programmer who uses library 
by others have to be very careful not to overwrite what the super-class
has. That's tough without peeking into the source!

Please let me know that I'm wrong. I really hope Ruby will handle that
for me.

Chochain

Dave Dunkin <dave_dunkin@hotmail.com> wrote:
> Ruby is a dynamic language and code is evaluated at run time. A super 
> class can call a method of a sub class because the code that does the 
> calling is not checked until run time, when that method call is valid. 
> I'm pretty sure that's how it works.

> Dave

> On Friday, May 4, 2001, at 06:41 PM, John Kaurin wrote:

>> I re-read Chapter 19 in Programming Ruby, but could not
>> find an explanation of a super class' method recognizing a
>> base class' method. I am not clear why this is valid (C++
>> code would choke in the compile phase). I assume it has
>> something to do with how instances are constructed in Ruby,
>> but you know what happens when you assume.