From: Peter Hickman <peter@...>
Date: 2002-12-04T19:39:11+09:00
Subject: Class variables problem

I have used

class Test
	def Test.Calc(x)
		return x * 2
	end
end

class Fred < Test
end

puts Fred.Calc(12)

which return 24 and is what I expected. But what I wanted to do was

class Test
	def Test.Calc(x)
		return @@rate * x
	end
end

class Fred < Test
	@@rate = 10
end

puts Fred.Calc(12)

which

s2:3:in `Calc': uninitialized class variable @@rate in Test (NameError)
	from s2:11

Now the class method has been inherited (and named accordingly) and I 
was expecting it to use the class variable as defined in Fred but it was 
trying to pick up the class variable in Test. How can I have the 
inheritence of a class method that accesses the class variable of the 
child class?

This is a gross simplification, the class I am designing would really 
benefit from this working as I hoped. Oh yes. I am using ruby 1.6.7 
(2002-03-19) [i386-linux]

Any pointers greatly appreciated.