Adding a new design constraint to D

[Ola Fosheim Grøstad]

On Thursday, 16 June 2022 at 01:04:22 UTC, forkit wrote:
> On Thursday, 16 June 2022 at 00:06:14 UTC, forkit wrote:
>>
>
> see .. the world does not come crashing down, simply because 
> you can declare something private ;-)
>
>
> (in Swift)
>
> // -----------
> struct A
> {
>   private static var x = 100;
>   fileprivate static var z = 200;
> }
>
> //print(A.x); //  error: 'x' is inaccessible due to 'private' 
> protection level
> print(A.z); // ok
>
> // -----------

Swift has 5 different access control modes:

- private: as in C++
- file private: for the source file
- internal: for a collection of sources files constituting a 
module
- open access: allows subclassing and override outside the module
- public: …

Swift also does some conservative analysis of references, 
preventing writing to references if there is an alias that would 
make it a conflict:

https://docs.swift.org/swift-book/LanguageGuide/MemorySafety.html