ruby中的多继承类型继承 [英] Multiple-Inheritance type class inheritance in ruby

问题描述

我有一个 Base 超类和一堆派生类，比如 Base :: Number ，基础::颜色。我希望能够使用这些子类，就好像我继承了 Fixnum ，如果是 Number 。

I got a Base superclass and a bunch of derived classes, like Base::Number, Base::Color. I'd like to be able to use those child classes as if I they inherited from say Fixnum in the case of Number.

最好的方法是什么，同时让他们对 is_a做出适当的回应？基数？

What's the best way to do this, while still having them respond appropriately to is_a? Base ?

所以，我应该可以做到

Number.new(5) + Number.new(6) # => 11
Number.new.is_a? Base         # => true

我想我可以混入Base，并覆盖is_a？，kind_of？和instance_of？方法，但希望有一种更清洁的方式。

I'm thinking I could mix-in Base, and overwrite the is_a?, kind_of? and instance_of? methods, but hopefully there's a cleaner way.

推荐答案

使用Ruby实际上非常简单：

This is actually quite simple using Ruby:

module Slugish
  attr_accessor :slug
  def loud_slug
    "#{slug}!"
  end
end

class Stringy < String
  include Slugish
end

class Hashy < Hash
  include Slugish
end

hello = Stringy.new("Hello")
world = Stringy.new("World")

hello.slug = "So slow"
world.slug = "Worldly"

hello.loud_slug      #=> "So slow!"
world.loud_slug      #=> "Worldly!"

hello.is_a?(Slugish) #=> true
world.is_a?(Slugish) #=> true

"#{hello} #{world}"  #=> "Hello World"

stuff = Hashy.new
stuff[:hello] = :world
stuff.slug = "My stuff"
stuff.loud_stug      #=> "My stuff!"
stuff.is_a?(Slugish) #=> true

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