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

[NotYouAgain]

On Saturday, 27 April 2024 at 12:45:27 UTC, Kagamin wrote:
> Javascript doesn't indicate much, it had no protection at all.

ok sure. how about almost every other major language in use then.

but back to D...

class ClassWithPrivateField
{
   private int privateField; // actually, my intent here is 
private(this),
                             // but it cannot be expressed in D.
                             // guess I better put the subclass in 
its own module
                             // in the hope that someone thinks by 
doing that,
                             // I've expressed that intent.

   this() { this.privateField = 42;  }
}

class Subclass : ClassWithPrivateField
{
   private int subPrivateField;

   this()
   {
     this.subPrivateField = 23;
     this.privateField = 52; // is this a mistake? The compiler 
has no way to know.
   }
}