Associated enum Type Implement CaseItratable

Question

I have two enums and one associated enum. I need to get all the possible cases from enum A and enum B at once.

enum A {
    case a
    case b
    case c
}

enum B {
    case d
    case e
    case f
}

enum C {
    case first(A)
    case second(B)
}

extension C: CaseItratable {
 //How to implement?
}

Need a allCases method in enum C which returns all cases in enum A and all cases in enum B

Your question is a bit unclear. You want to simply get all A and B cases in a method in enum C? — PGDev
– PGDev, Commented Oct 22, 2019 at 7:55

PGDev · Accepted Answer · 2019-10-22 07:56:26Z

1

1. Conform enum A and enum B to CaseIterable protocol

enum A: CaseIterable {
    case a, b, c
}

enum B: CaseIterable {
    case d, e, f
}

2. Get all cases of enum A and enum B using allCases.

enum C {
    case first(A)
    case second(B)

    var casesOfA: [A] {
        return A.allCases //here...
    }

    var casesOfB: [B] {
        return B.allCases //here...
    }
}

answered Oct 22, 2019 at 7:56

PGDev

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Comments

Sweeper · Accepted Answer · 2019-10-22 07:58:46Z

1

It's more helpful if A and B are CaseIterable as well, then you can implement CaseIterable in C like this:

extension A: CaseIterable {}
extension B: CaseIterable {}

extension C: CaseIterable {

    static var allCases: [C] {
        return A.allCases.map(C.first) + B.allCases.map(C.second)
    }
}

edited Oct 22, 2019 at 7:58

answered Oct 22, 2019 at 7:57

Sweeper

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3 Comments

Martin R Over a year ago

You don't need the type alias, that is inferred automatically.

Sweeper Over a year ago

@Saranjith Which version of Swift are you using? It works fine on Swift 5.1.

Sweeper Over a year ago

@Saranjith What did you do?

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