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erubboli/singleton_pattern.rb

Created August 27, 2010 09:31
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singleton_pattern.rb
class Logger
include Singleton
def warning( msg )
#...
end
end
a = Logger.instance
b = Logger.instance
a.object_id #=> 70091834349580
b.object_id #=> 70091834349580
c = Logger.new #=> NoMethodError: private method `new'
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