From: Brian Candler <b.candler@...>
Date: 2010-05-11T17:58:07+09:00
Subject: Re: In Ruby, can the coerce() method know what operator it is th

Jian Lin wrote:
> So what if most operators can use this method, but not when it is (a -
> b) != (b - a) situation?  Can coerce() know which operator it is, and
> just handle those special cases, while just using the simple  [self,
> something] to handle all the other cases where (a op b) == (b op a) ?
> (op is the operator).

In ruby 1.8 and 1.9, != is syntactic sugar for "not ==". So put the 
logic you want in your == method.

class Foo
  def ==(other)
    puts "Yay!"
    false
  end
end

puts "Boing!" if Foo.new != Foo.new

# prints:
# Yay!
# Boing!
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