From: Adriano Ferreira <adrfer@...>
Date: 2010-10-01T22:09:02+09:00
Subject: Re: Operator Overload

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Robert, I get the point. However it's important to notice that there's no such 
thing as operator overloading in Ruby. Things like :+, :-, :*, etc, are just 
plain methods. You can achieve what you want by opening the Fixnum class and 
redefining the method :+. Important to say is that all instances of this will be 
affected as soon as you make the change.

Eg:

class Fixnum
  def -(x)
    self + x
  end
end

puts 1 - 1 # => 2

Another tip: In Ruby, every expression returns a value, so there's no need to 
explicit the 'return'.

Regards,

Adriano



________________________________
From: Robert Klemme <shortcutter@googlemail.com>
To: ruby-talk ML <ruby-talk@ruby-lang.org>
Sent: Thu, September 30, 2010 3:10:35 AM
Subject: Re: Operator Overload

On 09/28/2010 03:49 AM, Trevor Hinesley wrote:
> Hey guys,
>
> I'm slowly getting the hang of Ruby, I'm a Java guy by trade. I really
> like Ruby and am picking up on it pretty quickly, but for some reason my
> overload of the "+" operator is not working. Here is the code:
>
> class Overloading
> def -(a)
>    return -a
> end
> b = 2-4
> puts "#{b}"
> end
>
> Basically, I'm trying to turn the minus operator into a plus operator
> for a project to show how operator overloading in Ruby works, but this
> isn't working from some reason, and I'm not sure why.
>
> Help?

This might be interesting for you:

http://blog.rubybestpractices.com/posts/rklemme/019-Complete_Numeric_Class.html

Kind regards

    robert


      
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