From: Christoph <chr_news@...>
Date: 2002-09-10T09:13:10+09:00
Subject: Re: scopes

"Kontra, Gergely"  wrote in
....
> >The instance variables are always private in Ruby:
> >you can't access the instance variables of an object from
> >a different object.
>
> What if I write mail and pass instead of @mail and @pass
> Gergo

This does not work either - you have to ``transport'' @mail as
an argument into the @pass scope.  However, a local ``mail''
could be seen been  in a ``@pass'' singleton method defined
via ``define_method''.

---
class Foo
    def initialize
      @pass =  Object.new
    end
    def mail=(got)
        mail =  got
        class <<  @pass ;self end.send(:define_method,:check) \
        { || (mail =~ /milk/) ? "yes" : "no" }
       got
    end
    def got_milk?
       p @pass.check
    end
end

a,b = Foo.new, Foo.new

a.mail = "books"
b.mail = "milk and cookies"

a.got_milk? # no
b.got_milk? # yes
---

/Christoph