Sealed classes - would you want them in D?

[jmh530]

On Thursday, 10 May 2018 at 13:47:16 UTC, rikki cattermole wrote:
> [snip]
>
> Adding a keyword like sealed isn't desirable.
>
> I'm trying to find fault of the concept, but it definitely is 
> tough.
>
> You basically want protected, but only for specific packages, 
> otherwise final.
>
> protected(foo, final)

My read was that he wants an escape hatch on final so that he can 
extend the type in a module and not have to worry about people in 
other modules extending them.

So if he has

module foo;

class A { }

final class B : A {    }

in one module, he wants to be able to create a new

final class C : B {    }

and keep class B as final so that no one else can extend it in 
another module.