Sealed classes - would you want them in D? (v2)

[Gheorghe Gabriel]

On Friday, 18 May 2018 at 12:16:55 UTC, aliak wrote:
> On Friday, 18 May 2018 at 12:00:58 UTC, Gheorghe Gabriel wrote:
>> On Thursday, 17 May 2018 at 02:32:07 UTC, KingJoffrey wrote:
>>> [...]
>>
>> I think this code has cleaner sintax:
>>
>> class A {
>>     private int x;
>>     sealed int y;
>> }
>> void main() {
>>     A a = new A();
>>     a.x = 7; // ok, it's private to module
>>     a.y = 3; // error, it's sealed to class
>> }
>
> You may not need a new word at all. You can also enhance 
> private to take arguments. Package already does this. You can 
> give private a symbol list that says which symbols this is 
> private for. So:
>
> class A {
>   private int x;
>   private(A) int y;
> }
> void main() {
>   A a = new A();
>   a.x = 7; // ok, it's private to module
>   a.y = 3; // error, it's sealed to class
> }
>
> Cheers,
> - Ali

Good idea. Or: private(this)
Because using "this" it is easier tu put this code in a mixin for 
multiple classes.
Example:

string var = "private(this) var;";

class A {
     mixin(var);
}

class B {
     mixin(var);
}