From: Clifford Heath <no.spam@...>
Date: 2007-01-31T15:55:09+09:00
Subject: Re: Tricks with method as superclass

Max Muermann wrote:
> This is really cool.

Thanks, I agree. Ara beat you to it, but I thought I'd
post a simpler example too. The cute thing about this is
that you can use method_missing magic to make the attached
block use a different DSL than the class body.

$ cat superclass-method-simple.rb
class Foo
    def initialize(*args)
        puts "Initializing a Foo"
    end
end

def Foo(*args, &block)
    Class.new(Foo).class_eval <<-END
            @@_args = args
            @@_block = block
            def initialize
                super
                puts @@_args.inspect
                @@_block.call if @@_block
            end
            self
        END
end

class Bar < Foo("Hi there!") {
        puts "Surprise!"
    }
end

puts "All ready, here goes:"
Bar.new

$ ruby superclass-method-simple.rb
All ready, here goes:
Initializing a Foo
["Hi there!"]
Surprise!
$

Cute, huh? :-)