From: ts <decoux@...>
Date: 2002-09-24T17:54:00+09:00
Subject: Re: alias/method redfinition

>>>>> "a" == ara howard <ahoward@fsl.noaa.gov> writes:

a> so, in general, extending an object always results in a new proxy
a> class being created as the first one to be searched in the inheritence
a> hierarchy, 

 second one : first ruby create a singleton class for example

pigeon% cat b.rb
#!/usr/bin/ruby
class A
   def a
      p "class A"
   end
end

module M
   def a
      p "module M"
      super
   end
end

a = A.new
a.extend M
class << a
   def a
      p "singleton class"
      super
   end
end

a.a
pigeon% 

pigeon% b.rb
"singleton class"
"module M"
"class A"
pigeon% 

a> and because mutiply extending an object with a module would
a> result in duplicate classes being created in the inheritence tree ruby
a> protects against this  by
a> not allowing 'extend M' to happen more than once?

 yes,


Guy Decoux