My two cents

[Satoshi]

On Monday, 23 October 2017 at 20:47:26 UTC, Walter Bright wrote:
> On 10/18/2017 1:56 AM, Satoshi wrote:
>> Unable to publish closed source library without workaround and 
>> ugly PIMPL design.
>
>
> Consider this:
>
> ----------- file s.d ------------
>   struct S {
>     int x;
>     this(int x) { this.x = x; }
>     int getX() { return x; }
>   }
> ----------- file s.di ------------
>   struct S {
>     this(int x);
>     int getX();
>   }
> --------------------------
>
> User code:
>
>     import s;
>     S s = S(3);
>     writeln(s.getX());
>
> Ta dah! Implementation is hidden, no PIMPL. Of course, inlining 
> of the member functions won't work, but it won't work in C++, 
> either, when this technique is used.
>
> I.e. you can use .di/.d files just like you'd use .h/.cpp in 
> C++. The technique works with classes, too.


what about this:

---------- file.d
class Foo {
   private int bar;
   private string text;

   void call() { }
}

----------- file.di

class Foo {
   call();
}



and then I want to inherit from it (I have access to file.di only)
class Bar : Foo { // I cannot due I have misleading information 
about size of Foo

}