`restricted` member variables

[Paul Backus]

On Wednesday, 22 June 2022 at 23:51:53 UTC, forkit wrote:
>
> I think Stroustrup summed it up (in 1987, and with examples) 
> much better than I can:
>
> " Data Abstraction Programming with modules leads to the 
> centralization of all data of a type under the control of a 
> type manager module."
>
> https://www.researchgate.net/profile/Bjarne-Stroustrup/publication/221496180_What_is_Object-Oriented_Programming/links/0f3175393334f4f95b000000/What-is-Object-Oriented-Programming.pdf?origin=publication_detail

If you actually look at the quote in context, what Stroustrup is 
describing is essentially the PIMPL idiom, where the 
representation of an abstract data type is made entirely opaque 
to the code using it. This opaqueness is what leads to the 
shortcomings Stroustrup describes.

D's modules do not work like this, and thus do not suffer from 
those shortcomings.

Here is a link to a freely-available PDF of the linked paper, on 
Stroustrup's own website, for anyone else who would like to read 
it:

https://www.stroustrup.com/whatis.pdf