gistfile1.coffee

class Behaviours
    constructor: (@prototype) ->
    attr_accessor: (attributes...) ->
        for attr in attributes
            value = null
            @prototype['set_' + attr] = (v) -> value = v
            @prototype['get_' + attr] = -> value
    
meta = (def) ->
    def::meta.call(new Behaviours(def::))
    def

meta class Foo
    meta: ->
        @attr_accessor 'bar'