Rethink OOP access permissions

[Richard (Rikki) Andrew Cattermole]

On 27/04/2024 9:25 PM, Daniel N wrote:
> This is an alternative to "private(this)".
> 
> I think it would be much more interesting if it was possible to separate 
> read and write permissions instead.
> (The syntax is just an example, not that important, just for 
> illustration purposes.)
> 
> ```d
> class C
> {
>      get(module) set(class) int x = 0;
> }
> ```

While I'm not against it, think about how this would be implemented.

You would need an enum with all the different values for both getting 
and setting, I can already see some resistance there.

Plus you'd need some arithmetic on the values, to see if you can perform 
operators (modify in place).

> Some ideas from C# are also interesting. They have 'init' and 'readonly' 
> aswell.

The C# ``readonly`` type qualifier is similar to our ``immutable``, this 
comes from Midori and one of the language authors Joe Duffy has compared 
it equivalently against D's previously.