From: "Mauricio Fernández" <batsman.geo@...>
Date: 2004-05-15T17:03:15+09:00
Subject: Re: changing class at runtime

On Sat, May 15, 2004 at 04:48:54PM +0900, Ryan Paul wrote:
> I'm trying to find a way to arbitrarily alter the class of an instance at
> runtime. The documentation didn't appear to have any clues.
> 
> Ultimately, I want to be able to do something like this:
> 
> class MyClass1
>   def fnc1
>     puts "fnc1 in class 1"
>   end
> end
> 
> class MyClass2
>   def fnc1
>     puts "fnc1 in class 2"
>   end
> end
> 
> a = MyClass1.new
> a.fnc1
> puts a.class
> 
> a.class = MyClass2
> a.fnc2
> puts a.class
> 
> Python lets you do it thusly: someinstance.__class__ = someclass

batsman@tux-chan:/tmp$ cat ghfgkhjioujklg.rb
require 'evil'

class MyClass1
  def fnc1
    puts "fnc1 in class 1"
  end
end

class MyClass2
  def fnc1
    puts "fnc1 in class 2"
  end
end

a = MyClass1.new
a.fnc1
puts a.class

a.class = MyClass2
a.fnc1
puts a.class

batsman@tux-chan:/tmp$ ruby ghfgkhjioujklg.rb
/home/batsman/usr/lib/ruby/1.8/dl/import.rb:12: warning: instance variable @types not initialized
fnc1 in class 1
MyClass1
fnc1 in class 2
MyClass2


http://evil.rubyforge.org

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