ruby - Ruby - 对象可以访问或识别实例化它的对象吗？

Question

例如，我该如何实现以下内容：

class A
  def initialize
    b = B.new
  end
end

class B
  def initialize
   puts #how can I find out who instantiated me
  end
end

Answer 1

class A
  def initialize
    B.new(self)
  end
end

class B
  def initialize initializer
    puts initializer
  end
end

A.new # => #<A:0x007fee78368dc8>