Feedback on Sealed Types
Brian Goetz
brian.goetz at oracle.com
Wed May 1 13:58:12 UTC 2019
>
>> I kind a like the intellectual separation between
>> - a sealed interface which represent a closed type and requires a permit clause and
>> - an enum interface which represent a sum type which is sugar on top of sealed interface + records.
>
To be clear, I think what Alan is suggesting, and what Remi is supporting, is:
- Make “sealed” the primitive for defining closed types, as originally proposed, and also
- Make the following
enumerated interface Foo {
R(X), S(Y);
STUFF
}
sugar for
sealed interface Foo
permits R, S {
STUFF
record R(X) implements Foo { }
record S(Y) implements Foo { }
}
Is that correct?
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