From: Dominik Werder <dwerder@...>
Date: 2004-12-10T05:07:27+09:00
Subject: Re: Overloading a module method?

I found some things on the path to the solution that I wanted to share.  
I'm not yet entirely happy with this code because I still have to watch to  
not "load 'mymath.rb'" it twice, anyway..
One important thing I learned: module functions are much different from  
normal methods you can define within a module..

module Math
   unless const_defined? :T    # I may not do this twice, otherwise I loose  
the original
     puts "Aliasing"
     T=true
     alias :sino :sin          # preserving the original
     module_function :sino     # required if I want to call sino from  
within Math.sin
   end
   def sin x                   # here goes my new sin where I still use the  
old one
     if x.kind_of? Wert
       W.abs sino(x.v), coso(x.v)*x.e
     else
       sino x
     end
   end
   module_function :sin        # make it available as Math.sin too
end