From: Its Me <itsme213@...>
Date: 2004-04-14T03:24:12+09:00
Subject: Re: global variable and dynamic binding: question

"Joel VanderWerf" <vjoel@PATH.Berkeley.EDU> wrote
> Would it help to hack together an object that has attrs corresponding to
> global vars?

This would require all references to those global vars to change (to
GLOBALS.var, or GLOBALS[var]). I was hoping to avoid such a change, but some
variant of this may be a fall back:

My approach is simple:

def binding (object, accessor, value, &block)
  object.with(accessor, value, &block)
end

class Object
  def with (attr, val)
    begin
      temp = self.get_attr(attr)
      self.set_attr(attr, val)
      yield
    ensure
      self.set_attr(attr, temp)
    end
  end
  def get_attr(attr);  self.send(attr);  end
  def set_attr(attr, val);  self.send(attr.to_s + '=', val);  end
end

# Hash, Array etc. can override get_attr and set_attr
# And then some overrides for global variables ...
class << theMissingGlobalObject
    def get_attr (global_symbol)
        some_getter_function (global_symbol)
    end
    def set_attr (global_symbol, value)
        some_setter_function (global_symbol, value)
    end
end

So I'm looking for theMissingGlobalObject. If there is no such thing I'd be
interested to know why; perhaps there is some very good reason, like some
tricky circularity with a global object holding on to global vars?