From: Yukihiro Matsumoto <matz@...>
Date: 2006-02-16T10:01:26+09:00
Subject: Re: why does this freeze not work?

Hi,

In message "Re: why does this freeze not work?"
    on Thu, 16 Feb 2006 09:48:28 +0900, "konsu" <konsu@hotmail.com> writes:

|i need to set an instance variable in my object once and make sure this 
|variable is not changed afterwards. i tried the code below which i expected 
|to fail with a TypeError but it happily outputs '2'. i kind of understand 
|why it succeeds, i think it just creates another @id when i call id=() 
|method, but is there a way to do what i want to do?

No.  You have frozen a Fixnum object 1, not @id.  Instance variables
are attributes of an object, not objects by themselves.  You have to
freeze whole object C, or use attr_reader instead of attr_accessor.

							matz.