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はじめに

移植やってます。

多重継承 (Python)

[py2rb] 多重継承 - Qiita 再び
20211214a.png

class A(object):
    def myprint(self):
        print('A')

class B(A):
    def myprint(self):
        print('B')
        super().myprint()

class C(B):
    def myprint(self):
        print('C')
        super().myprint()

class D(A):
    def myprint(self):
        print('D')
        super().myprint()

class E(D, C):
    def myprint(self):
        print('E')
        super().myprint()

o = E()
o.myprint()

# E
# D
# C
# B
# A

class Eが画像のオレンジ色クラスです。
左側からDFSで継承されています。
class Aが上手いこと後ろに回っていますね。

どうする? (Ruby)

class A
  def myprint
    puts 'A'
  end
end

class B < A
  def myprint
    puts 'B'
    super
  end
end

class C < B
  def myprint
    puts 'C'
    super
  end
end

class D < C
  def myprint
    puts 'D'
    super
  end
end

class E < D
  def myprint
    puts 'E'
    super
  end
end

p E.ancestors

# [E, D, C, B, A, Object, Kernel, BasicObject]

一つは、継承チェーンを考えて直列に並べる。

module A
  def myprint
    puts 'A'
  end
end

class B
  include A
  def myprint
    puts 'B'
    super
  end
end

class C < B
  def myprint
    puts 'C'
    super
  end
end

module D
  include A
  def myprint
    puts 'D'
    super
  end
end

class E < C
  include D
  def myprint
    puts 'E'
    super
  end
end

p E.ancestors

[E, D, C, B, A, Object, Kernel, BasicObject]

ここでは見えませんが、ADがモジュール化できそうなのでMixinする方法

メモ

  • Python の 多重継承 を学習した
  • 道のりは遠そう
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