From: "Iñaki Baz Castillo" <ibc@...>
Date: 2009-04-07T07:12:48+09:00
Subject: class C < B < A

Hi, I have this case:

  class A     ; end
  class B < A ; end
  class C < B ; end

  a = A.new
  b = B.new
  c = C.new


I look for a way (***) to get the following results:

a)
  a *** A => true
  a *** B => false
  a *** C => false

b)
  b *** A => false  (*1)
  b *** B => true
  b *** C => false

c)
  c *** A => false  (*2)
  c *** B => true
  c *** C => true


Note that I could use ===, so:
  A === a => true
  A === b => false

but in cases *1 and *2 the result is not what I want:

  A === b => true (I want false)
  A === c => true (I want false)


I could play with a.class.ancestors, but isn't another way?

Thanks a lot.

-- 
Iñaki Baz Castillo <ibc@aliax.net>