From: Eli Bendersky <eliben@...>
Date: 2006-05-07T00:19:07+09:00
Subject: Creating sub-classes using Struct

Hello,

There are two Ruby features I want to combine. One is sub-classes (or 
embedded classes):

class Foo
	def initialize(x)
		puts "new Foo #{x}"
	end

	class Bar
		def initialize(y)
			puts "new Bar #{y}"
		end
	end
end


joe = Foo::Bar.new(12)    # prints "new Bar 12"


Another is dynamic creation of new classes using Struct:

Customer = Struct.new(:name, :address)     #=> Customer
eddy = Customer.new("Dave", "123 Main")

Here 'Customer' is a class and 'eddy' is an instance of the Customer 
class.

Now, by combining the features, I mean creating a subclass of Foo 
dynamically, using Struct. The following pseudo-code demonstates it 
(pseudo because it obviously doesn't work and only shows what I'm trying 
to do):

class Foo
	def initialize(x)
		puts "new Foo #{x}"
	end

	Bar = Struct.new(:name, :address)
end

eddy = Foo::Bar.new("Dave", "123 Main")


How can this be done ?

TIA
Eli

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