Extending D's support for object-oriented design with private(this)

[Lance Bachmeier]

On Thursday, 25 April 2024 at 05:37:24 UTC, NotYouAgain wrote:

> Both (1) (2) (3) can be fully resolved by adding private(this) 
> functionality, as demonstrated here:
>
> // --
> module m;
>
>     class C
>     {
>       private(this) int _count; // visibilty of this member is 
> contained within this type
>     }
>
>     unittest
>     {
>       C c = new C();
>       c._count = 42; // Error: data member _count is an 
> inaccessible (private)property of type `m.C`
>     }
>
> // ----

This introduces a more restricted version of private. Overloading 
`private` to give it a second meaning is going to cause confusion 
for new users and really anyone that doesn't use D's OOP all the 
time. I recommend using something like `hidden` or 
`strongprivate`.