From: Ken Bloom <kbloom@...>
Date: 2006-11-07T13:45:08+09:00
Subject: Re: simple mix-in example

On Tue, 07 Nov 2006 00:33:00 +0000, pedro mg wrote:

> Hi,
> 
> can we consider this is a mix-in newbie example ? We are giving a new
> feature to method > on our Mixin class.
> 
> class Mixin 
>   def initialize(a)
>     @a = a
>   end
>   def >(arg)
>     puts "Yep!" if @a > arg
>   end 
> end
> 
> test = Mixin.new(3)
> test > 1   # -> Yep!
> test.> 1   # -> Yep!
> test.>(1)  # -> Yep!
> puts "Yep, too!" if 2 > 1  # -> Yep, too! 
> puts "not now!" if teste < 1  # -> *
> 
> * undefined method `<' for #<Mixin:0xb7d35858 @a=3> (NoMethodError)
> 
> Works as expected. Thanks,

Yuck.

if test > 1
  puts "Yes"
else
  puts "No"
end

will print out
Yep!
No

You need to define the > operator as follows:
   def >(arg)
     puts "Yep!" if @a > arg
     @a > arg
   end 
so that it returns a proper value
-- 
Ken Bloom. PhD candidate. Linguistic Cognition Laboratory.
Department of Computer Science. Illinois Institute of Technology.
http://www.iit.edu/~kbloom1/