AHK V2: doc example for "Sub-classing Arrays of Arrays" not working for me

[SAbboushi]

Documentation example for "Sub-classing Arrays of Arrays"

I'm getting following error:

Error: Missing a required parameter.

Specifically: p3

Line#
---> 012: x[p1] := new x.base

Don't know what to make of it...

I've tried

Code: Select all

MsgBox x[1,2]

and

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MsgBox x[1,2,3,4]

to try and make sense of what's going on, but get the same error message...

Can anyone please help?

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x := {base: {addr: Func("x_Addr"), __Set: Func("x_Setter")}}

; Assign value, implicitly calling x_Setter to create sub-objects.
x[1,2,3] := "..."

; Retrieve value and call example method.
MsgBox x[1,2,3] "`n" x.addr() "`n" x[1].addr() "`n" x[1,2].addr()

x_Setter(x, p1, p2, p3) {
    x[p1] := new x.base
}

x_Addr(x) {
    return &x
}

[nnnik]

The setter gets called when you assign to an object key that doesn't exist yet.
Assigning something within a setter will also trigger the setter.
And in AHK v2 you need to pass at least the correct amount of variables.

If you combine this knowledge you will find that the code within your setter is the issue. It tries to set a new value that doesn't exist yet which in turn triggers itself.
The problem is though that the key you assign a value to is not long enough. You need at least 3 keys to call the setter correctly from within your setter.

However I think that you don't want to trigger the setter at all. Even if you make your setter call itself correctly the script would still fail.
The Setter would try to assign something which would call a setter which would try to assign something which would call a setter and so on and so on until you get a StackOverflow

You should probably use ObjRawSet to avoid this.

Getters and setters are a pain and I tend to avoid them.

[SAbboushi]

Thanks - hopefully someone will update that example in the AHK V2 documentation