From: ahoward <ahoward@...>
Date: 2002-11-11T03:24:40+09:00
Subject: Re: return MyClass.new vs self.type.send :new

On Mon, 11 Nov 2002 dblack@candle.superlink.net wrote:

> I'm lost.  Can you explain what you're trying to do?  I'm willing
> to go out on a limb and speculate that there's a more idiomatic
> (and 'bless'-less :-) way to do it.  But first I need a handle on
> what "it" is :-)

here's an example of 'it' - don't flame it too bad, it's just an example! ;-)

#!/usr/bin/env ruby

module KlassMethods
  attr_accessor :k
  def init k
    self.k = k
  end
  def initialize k
    self.init k
  end
end
class Klass
  include KlassMethods
  def Klass.bless o, k
    oc = o.clone.extend KlassMethods
    oc.init k
    oc
  end
end

module SubKlassMethods
  attr_accessor :sk
  def init k, sk
    super k
    self.sk = sk
  end
  def initialize k, sk
    self.init k, sk
  end
end
class SubKlass < Klass
  include SubKlassMethods
  def SubKlass.bless o, k, sk
    co = super o, k
    co = co.extend SubKlassMethods
    co.init k, sk
    co
  end
end


if $0 == __FILE__
  k = Klass.new 42
  puts k.k	      # >> 42

  o0 = Object.new
  b0 = Klass.bless o0, 42
  puts b0.k	      # >> 42

  sk = SubKlass.new 42, 'forty two'
  puts sk.k	      # >> 'forty two'
  puts sk.sk	      # >> 'forty two'

  o1 = Object.new
  b1 = SubKlass.bless o1, 42, 'forty two'
  puts b1.k	      # >> 42
  puts b1.sk	      # >> 'forty two'

  kb = SubKlass.bless k, 42, 'forty two'
  puts kb.k	      # >> 42
  puts kb.sk	      # >> 'forty two'

  b0b = SubKlass.bless b0, 42, 'forty two'
  puts b0b.k	      # >> 42
  puts b0b.sk	      # >> 'forty two'
end


-a


-- 

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 | Ara Howard
 | NOAA Forecast Systems Laboratory
 | Information and Technology Services
 | Data Systems Group
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 | Email: ahoward@fsl.noaa.gov
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