Inout as Any ?

Can't pass an "inout" parameter as [AnyOnject] ?

It would help if you explained your specific problem in more detail. The test code below shows that you can use

inout

with

[AnyObject]

, so there’s clearly more to this than you’ve explained.

func test(_ objects: inout [AnyObject]) {
    objects.append("d" as NSString)
}

var o: [AnyObject] = ["a" as NSString, "b" as NSString, "c" as NSString]
test(&o)
print(o)    // prints: [a, b, c, d]

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

Sorry does need a little more info ...

func test(_ toArray: [AnyObject])

test(toArray: myArray as [AnyObject])

"Cannot convert value of type '[MovieItem]' to type '[AnyObject]' in coercion"

var tmp = myArray as [AnyObject]
test(toArray: &tmp)

Works fine but I'm still unclear that tmp is not a reference to the array I want to pass ? (which is a public var)

Works fine but I'm still unclear that

tmp

is not a reference to the array I want to pass?

It’s definitely not. The best way to think about

inout

is that it acts like a copy in / out operation (hence the name). You can think of this:

func test(_ a: [Int]) { … }

var b: [Int] = …
test(&b)

as being transformed to:

func test(_ a: [Int]) -> [Int] { … }

var b: [Int] = …
let tmpIn = b
let tmpOut = test(tmpIn)
b = tmpOut

Nowhere does it form a reference to the original value [1].

(which is a public var)

Of type

[AnyObject]

? Or of type

[MovieItem]

? The latter is likely to be problem because the function signature of

test

says that it can put

AnyObject

into the array; there’s no restriction that says it must work on

MovieItem

.

If you want such a restriction you should use a generic:

func test<Element>(_ toArray: inout [Element]) {
    print(toArray)
}

This test that

test

works on an array of items, but that array is homogenous and the caller gets to specific the exact type.

Share and Enjoy
—
Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware

let myEmail = "eskimo" + "1" + "@apple.com"

[1] Except insofar as used by compiler optimisations.