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#scala #variances
the type defined by the class Stack[T] is subject to invariant subtyping regarding the type parameter.
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Variances - Scala Documentation
ns may be added when a class abstraction is defined, whereas in Java 5, variance annotations are given by clients when a class abstraction is used. In the page about generic classes an example for a mutable stack was given. We explained that <span>the type defined by the class Stack[T] is subject to invariant subtyping regarding the type parameter. This can restrict the reuse of the class abstraction. We now derive a functional (i.e. immutable) implementation for stacks which does not have this restriction. Please note that this is


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