From: eugine_kosenko@... (Eugine Kosenko)
Date: 2001-09-11T21:25:07+09:00
Subject: [ruby-talk:21106] (Pure) virtual methods

Hi!

I need to implement the next situation:

class Foo
   def Foo.greeting
      "Hello! I'm a #{Name}"
   end
end

class Bar1 < Foo
   Name = "Good Guy"
end

class Bar2 < Foo
   Name = "Bad Guy"
end

Bar1.greeting   # -> Hello! I'm a Good Guy
Bar2.greeting   # -> Hello! I'm a Bad Guy

This is does not work as well as I would try to define

class Foo
   Name = "Unknown Guy"
end

The real situation is more sophistic, and may vary to instance
methods. IIn general, this is classic deferred (virtual)
implementation, but I have not found this in ruby.

Any ideas?

E-mail is preferred