Inheritance (object-oriented programming): Revision history


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  • curprev 15:5115:51, 29 September 202192.66.118.116 talk 29,054 bytes +111 Point out a flaw in the idea that subtyping is interface inheritance, as generics also give rise to an implicit subtyping relation. For instance, given Scala interface trait Fn[A] { def compute(x : A): A }, the polymorphic Fn[A] with unconstrained A is a subtype of Fn[Int], not because of interface inheritance, but because an unspecialized Fn[A] can be used in place of a specialized Fn[Int]. undo
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