From: Simon Strandgaard <neoneye@...>
Date: 2004-03-05T00:29:53+09:00
Subject: Re: class<<inst -> neither included nor extended works

On Fri, 05 Mar 2004 00:08:45 +0900, nobu.nokad wrote:
> At Thu, 4 Mar 2004 22:59:45 +0900,
> Simon Strandgaard wrote in [ruby-talk:94219]:
>> I would like to execute some code at the point
>> when the 'class<<txt' is taking place..
>> 
>> But I cannot figure out how ?
> 
> I don't know what you really want...
> 
>> txt = "text"
>> class << txt
>     puts "like this?"

Yes.. however if I invoke 'install' instead of above 'puts',
then 
b.rb:3: undefined local variable or method `install' for #<Class:#<String:0x810a684>> (NameError)


server> ruby b.rb
nil
b.rb:9: warning: instance variable @state not initialized
change state  old=  new=true
true
true
server> cat b.rb 
obj = "im just some random object"
class << obj
  #install # why doesn't this work?
  def install
    puts "install"
    @state = false
  end
  attr_reader :state
  def change_state(state)
    puts "change state  old=#{@state}  new=#{state}"
    @state = state
  end
end
p obj.state
p obj.change_state(true)
p obj.state
server>

--
Simon Strandgaard