On 4/12/21 2:16 PM, Jack wrote:
Give this class:
```d
class A
{
int X() { return x; }
int X(int v) { return x = v;}
private int x;
}
```
I'd like to allow use ```+=```, ```-=``` operators on ```X()``` and keep
encapsulation. What's a somehow elegant way to do that?
It's really hard to do.
One problem is lifetime management. There is no way to do something like
`ref`, which does not provide a way to make a copy of the original thing
(the reference) in @safe code.
But the way I'd tackle it is to write a pseudo-reference wrapper that
forwards to the getter/setter.
I'm sure there's a mixin template solution that works, I just don't have
the time to code it out right now.
You can take a look at Mike Franklin's unpublished DIP here for inspiration:
* [DIP conversation](https://github.com/dlang/DIPs/pull/97)
* [DIP
text](https://github.com/dlang/DIPs/blob/fdd016a16bf1898fda901b9d716f5bcc6021c1a7/DIPs/DIP1xxx-mvf.md)
-Steve
