From: none <webb.sprague@...>
Date: 2005-07-07T15:10:47+09:00
Subject: Subclassing weirdness in rb-gsl

Does anyone know why it would be impossible for me to subclass
GSL::Matrix?  This might be evidence of my lack of sophistication in
Ruby or OO, but perhaps there is an easy or interesting answer.  Here
is the code:

class SuperMatrix < GSL::Matrix
   def initialize
     @foo = 2
     super
   end
   def whatever
     return @foo
   end
end

m = SuperMatrix.new([1,2,3], [4,5,6])
irb(main):058:0> m.inspect
GSL::Matrix
[  1.000e+00  2.000e+00  3.000e+00
  4.000e+00  5.000e+00  6.000e+00 ]

irb(main):056:0> m.whatever
  NoMethodError: undefined method `whatever' for
#<GSL::Matrix:0xb6f75264>
       from (irb):56

Thanks to all for a great language and community!