From: Robert Klemme <bob.news@...>
Date: 2004-02-27T00:59:58+09:00
Subject: Re: Why don't $global and @instance variables need *initialization*?


"David Garamond" <lists@zara.6.isreserved.com> schrieb im Newsbeitrag
news:403E125E.1020506@zara.6.isreserved.com...
> ts wrote:
> >>>>>>"D" == David Garamond <lists@zara.6.isreserved.com> writes:
> > D> Btw, what do people think of adding the following system hooks in
Ruby:
> >  What are you trying to solve ?
>
> Making Ruby raise NameError when an uninitialized global or instance
> variable is accessed (just like when a new local variable is mentioned
> without being assigned first).

Why do you need that?  What about lazy init?

class Foo
  def bar;@bar||={};end
end

f = Foo.new
f.bar["hello"] = "world"

.... or the common ad hoc init idiom?

class Bar
  def add(name)
    (@names||=[]) << name
  end
end

b = Bar.new
b.add "hello"

Regards

    robert