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class Module
# Returns the classes in the current ObjectSpace where this module has been
# mixed in according to Module#included_modules.
#
# module M
# end
#
# module N
# include M
# end
#
# class C
# include M
# end
#
# class D < C
# end
#
# p M.included_in_classes # => [C, D]
#
def included_in_classes
classes = []
ObjectSpace.each_object(Class) { |k| classes << k if k.included_modules.include?(self) }
classes.reverse.inject([]) do |unique_classes, klass|
unique_classes << klass unless unique_classes.collect { |k| k.to_s }.include?(klass.to_s)
unique_classes
end
end
end
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