Ruby 定义操作符过程 [英] Ruby defining operator procedure

问题描述

如何在 ruby​​ 中编写一个具有我可以这样调用的过程的类:

how can a write a class in ruby that has a procedures that i can call like this:

a = MyObj.new()
b =  MyObj.new()

c = a * b
d = a / b
e = a - b

这比:

c = a.multiply(b)
...

谢谢

推荐答案

你已经得到了关于如何定义二元运算符的答案，所以这里的小附录是你如何定义一元 -(比如负数).

You already got an answer on how to define the binary operators, so just as little addendum here's how you can define the unary - (like for negative numbers).

>  class String
..   def -@
..     self.swapcase
..   end
.. end #=> nil
>> -"foo" #=> "FOO"
>> -"FOO" #=> "foo"

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