Swift: Cannot create empty array of nested enum type

Question

I am trying to declare an empty array of enum defined inside of another class as follows, and am getting the following error:

class OuterClass {
    enum MyEnum {
        case ThingOne
        case ThingTwo
    }
}

// Error: Invalid use of '()' to call a value of non-function type '[OuterClass.MyEnum.Type]'
var emptyEnumArray = [OuterClass.MyEnum]()
emptyEnumArray.append(.ThingOne)

However, I can declare the array as follows with no problem:

// No errors
var emptyEnumArray: [OuterClass.MyEnum] = []

This only appears to be an issue when the enum is defined inside of another class, as this works:

enum OtherEnum {
    case ThingOne
    case ThingTwo
}

var emptyArrayTwo = [OtherEnum]()
emptyArrayTwo.append(.ThingTwo)

Any thoughts on why the first snippet doesn't work? Is this a language bug?

looked at it myself, and seems a lot like a bug yes. Have you tried running it with compiler warnings turned off? — R Menke
– R Menke, Commented Sep 29, 2015 at 2:24

Community · Accepted Answer · 2017-05-23 11:45:46Z

6

I think it's a Swift bug right now. This also works.

var emptyEnumArray = Array<OuterClass.MyEnum>()

The question just recalls me to a question in apple Swift tutorial.

edited May 23, 2017 at 11:45

CommunityBot

11 silver badge

answered Oct 20, 2015 at 12:20

Arbipher

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