From: "Iñaki Baz Castillo" <ibc@...>
Date: 2008-04-15T09:06:26+09:00
Subject: Re: How to duplicate a object changing the class without attributes memory copy

El Lunes, 14 de Abril de 2008, Gary Wright escribió:
>  If you just do something like:
>
> from_obj.name = header_obj.name
>
> You are simply copying object references, you aren't
> copying all the associated data.

Hi, that's not true: if an attribute is a String then there will be memory 
copy:

class Header
  attr_accessor :name
end

class From
  attr_accessor :name
end

header = Header.new
header.name = "AAAA"
=> "AAAA"

from = From.new
from.name = header.name
=> "AAAA"

from.name = "BBBB"
=> "BBBB"

header.name
=> "AAAA"


As you see in the example above if the attribute is a String (or a Fixnum and 
so) attribute copy means memory dupplication. Unfortunatelly in my case the 
attribute is a String.

Regards.





-- 
Iñaki Baz Castillo