在Ruby中覆盖实例变量数组的运算符 [英] Overriding instance variable array's operators in Ruby

问题描述

对不起，标题不好，我真的不知道该怎么称呼.

Sorry for the poor title, I don't really know what to call this.

我在Ruby中有这样的东西:

I have something like this in Ruby:

class Test
  def initialize
    @my_array = []
  end
  attr_accessor :my_array
end
test = Test.new
test.my_array << "Hello, World!"

对于@my_array实例变量，我想覆盖<<运算符，这样我就可以首先处理插入到其中的任何内容.我已经尝试过@my_array.<<(value)作为类中的一种方法，但是没有用.

For the @my_array instance variable, I want to override the << operator so that I can first process whatever is being inserted to it. I've tried @my_array.<<(value) as a method in the class, but it didn't work.

推荐答案

我认为您正在寻找这个东西:

I think you're looking for this:

class Test
  def initialize
    @myarray = []
    class << @myarray
      def <<(val)
        puts "adding #{val}" # or whatever it is you want to do first
        super(val)
      end
    end
  end
  attr_accessor :myarray
end

了解Ruby Singleton上有一篇很好的文章，介绍了相关主题类.

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