lib/unitwise/compatible.rb in unitwise-0.6.1 vs lib/unitwise/compatible.rb in unitwise-0.6.2

@@ -4,9 +4,16 @@
   # represented as a Signed Multiset.
   module Compatible
     # @api private
     def self.included(base)
       base.send :include, Comparable
+      base.send :include, Memoizable unless base < Memoizable
+      base.send :memoize, :composition, :composition_string
+    end
+
+    def initialize(*args)
+      super(*args)
+      freeze
     end
 
     # A representation of a unit based on the atoms it's derived from.
     # @return [SignedMultiset]
     # @api public