Re: [rbx ] include_remove

[poga (波卡)]

※ 引述《godfat (godfat 真常)》之銘言：
之前有看到一個叫mixology的gem...

可以支援mixin與unmix...

用途應該跟你要的uninclude差不多？



gem install mixology

==
範例：
require 'mixology'

class A
end

module X
  def hi
    puts "hi"
  end
end


a = A.new
a.mixin X
a.hi  #=> 'hi'
a.unmix X
a.hi  #=> undefine method

==

然後他還給了個拿來玩state pattern的範例...

class Door
  def initialize(open = false)
    @open = open
    if open
      mixin Open
    else
      mixin Closed
    end
  end

  def closed?
    kind_of? Closed
  end

  def opened?
    kind_of? Open
  end
end

module Closed
  def open
    unmix Closed
    mixin Open
  end
end

module Open
  def close
    unmix Open
    mixin Closed
  end
end





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