From: Michael Sas <lists@...>
Date: 2012-12-16T02:15:07+09:00
Subject: by value - by reference, circular reference

Hi,

i have a circular reference between two classes. Initialize of one needs
the other. Small example:

A.new b_instance
B.new a_instance

So I thought I could do:

a = A.new nil
b = B.new a
a = A.new B

The attached valuedemo.rb contains a executable example of how i tried
to do and shows the problem. It also showes where i get confused about
call by value or call by reference.

As I understand param in the example is not equal but the same to
@param. So param and @param are references to the same object, rather
identical copies of an object. So if the value changes in one place, it
should change every where.
It doesn't, so its clear my understanding is wrong.

I would be happy about general advice on solving circular references
too.

Attachments:
http://www.ruby-forum.com/attachment/7971/valuedemo.rb


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