Quote: use factorization to convert a non-polymorphic specialization hierarchy into a polymorphic hierarchy; lose extensibility due to missing methods

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The main idea of [factorized classes] is to convert … not violate the conformance condition in the specialization … The hierarchy of factorized classes is robust … [p.506] However, there is a problem when extending … [since they] may remove methods from classes. [So they lack extensibility]   Google-1   Google-2

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Topic: generic operations and polymorphism (65 items)