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[Ruby] forwardableとメソッドの呼び出し制限

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forwardableの使い方などはここが詳しい。

extend Forwardableするとdef_delegatorsを利用して、特定のオブジェクトに処理を委譲することができる。
このとき、メソッドの呼び出し制限を超えてオブジェクトのメソッドにアクセスすることができる。

require "forwardable"

class Forwarded
  def pub
    p "pub"
  end

  def pro
    p "pro"
  end

  def pri
    p "pri"
  end

  protected :pro
  private :pri
end

class Forward
  extend Forwardable

  def_delegators :@forwarded, :pub, :pro, :pri

  def initialize
    @forwarded = Forwarded.new
  end
end

forward = Forward.new

forward.pub
# => "pub"
forward.pro
# => "pro" (アクセスできる!!)
forward.pri
# => "pri" (アクセスできる!!)

柔軟というか、なんというか。

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