From: Johan Nilsson <johan.nilsson@...>
Date: 2004-12-09T21:17:31+09:00
Subject: Inheritance, mixins and initializers

Hi,

I've got a question regarding inheritance, mixins, order of initialization
and calling module/super class "initializers". I'd like to do something
along the lines of (pseudo-ruby code):

---
class Base
    def initialize(field_count)
        @fields = Array.new(field_count)
    end
end

module FooMixin
    def initialize(foo_field)
        @foo_field = foo_field
        self.fields[@foo_field] = Foo.new
    end

    def foo
        self.fields[@foo_field]
    end
end

module BarMixin
    def initialize(bar_field)
        @bar_field = bar_field
        self.fields[@bar_field] = Bar.new
    end

    def bar
        self.fields[@bar_field]
    end
end

class Derived < Base
    include FooMixin
    include BarMixin
    def initialize
        super(2)
        FooMixin(0)
        BarMixin(1)
    end
end

---

Obviously this doesn't work - is there any way of achieving something
similar? The Foo/Bar mixins depend on Base being initialized before them
(ok, maybe not in this particular example).

// Johan