Using closure in function scope to make "real" private class members

[zjh]

On Friday, 3 June 2022 at 10:20:08 UTC, bauss wrote:

> class Foo
> {
>     private class string _id; // Private to the class
> }

> class Foo
> {
>     private module string _id; // Private to the module
>     private int _number; // Same as "private module" since 
> that's the default
> }
> ```


I think it is `worth adding`. Simply adding some code can 
distinguish between `class` level and `module` level. It is very 
friendly for those familiar with `C++'s` class level 
encapsulation.