Created
July 10, 2015 23:26
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| module LibraryItem | |
| module Initializer | |
| def initialize *args | |
| @@group_identifier ||= 0 | |
| @identifier = @@group_identifier += 1 | |
| super *args | |
| end | |
| end | |
| module ClassMethods | |
| def count | |
| class_variable_get :@@group_identifier | |
| end | |
| end | |
| def eql? obj | |
| self.identifier == obj.identifier | |
| end | |
| def == obj | |
| self.eql? obj | |
| end | |
| def hash | |
| identifier | |
| end | |
| def self.included(klass) | |
| klass.send :extend, ClassMethods | |
| klass.send :attr_accessor, :identifier | |
| klass.send :prepend, Initializer | |
| end | |
| end | |
| class Bobobo | |
| include LibraryItem | |
| attr_accessor :attr | |
| def initialize attr = 0 | |
| @attr = attr | |
| end | |
| end |
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