Can static variables in methods be local for each object?

[cc]

On Tuesday, 20 July 2021 at 09:24:07 UTC, Mark Lagodych wrote:
> Is there a way to make myvar local to each instance of `X` 
> without making it a variable of `X`? Just curious.

Sorry if I missed something obvious but is there a specific 
reason why it isn't just a class member variable?
```d
class X {
	int myvar = 1234;

	int x(int param) {
		if (param == 0) return myvar;
		else { myvar = param; return myvar; }
	}
}
```
??

Why would you need a static variable inside a method but also 
have that static variable unique to each class instance, but not 
stored inside the class?  I could see maybe if the class 
definition were private and you can't change it, in which case 
you could extend it:

```d
class X {
	// Someone else's module
}

class MyX : X {
	int myvar = 1234;

	int x(int param) {
		return param ? myvar = param : myvar;
	}
}

void main() {
	auto x1 = new MyX();
	auto x2 = new MyX();

	x1.x(0).writeln;
	x2.x(0).writeln;

	x1.x(17).writeln;
	x2.x(0).writeln;
}
```