From: Roger Pack <rogerpack2005@...>
Date: 2007-10-19T03:06:32+09:00
Subject: Re: ruby wish-list

GC wish list:
Isn't it possible to create your own reference checking style object? 
Would this be possible, for example.


Class Object

 attr_reader :internal_object # only used if you call 
new_with_timely_death_wrapper for your new call--see below
 def new_with_timely_death_wrapper class_to_use, *args
   @internal_object = class_to_use.new *args # since this object is 
'only internal' deleting it later will be OK
 end

 def assign_to_me this_wrapped_object
  dec
  @internal_object = this_wrapped_object.internal_object
  inc
 end

 def do_method name, *args
   eval("@internal_object.#{name} *args") # ok there's probably a better 
way :) maybe object.internal_object.do_whatever args
 end

def dec
  @internal_object.count -= 1
  recycle_current_object if count == 0
end

def inc
  @internal_object.count += 1
end

def recycle_current_object
   # traverse internal members of @internal_object--force_recycle them, 
unless they're wrappers, then just dec them.
   @internal_object.recycle
end

def inc
  @internal_object.count += 1
end

def go_out_of_scope
  dec
  self.force_recycle # we are toast :) -- this is scary and might not be 
right
end

end

Then the example:

a = Array.new_with_timely_death_wrapper(0,0)
b = Array.new_with_timely_death_wrapper(0,0)  # only time you should use 
assign is on start
b.assign_to_me a #recycle's b's object, assigns internal_object to a's 
internal_object.a, sets count to 2
a.go_out_of_scope # a set to 1
b.go_out_of_scope # a set to 0 -- recycled.

?
-- 
Posted via http://www.ruby-forum.com/.