Abstract
Genericity allows the substitution of types in a class. This is usually obtained through parameterized classes, although they are inflexible since any class can be inherited but is not in itself parameterized. We suggest a new genericity mechanism, type substitution , which is a subclassing concept that complements inheritance: any class is generic, can be “instantiated” gradually without planning, and has all of its generic instances as subclasses.
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