[SR-349] Cannot use nested enums in definition of arrays or as dictionary #42969

swift-ci · 2015-12-23T00:52:15Z


Previous ID	SR-349
Radar	rdar://problem/16849958
Original Reporter	michaelosity (JIRA User)
Type	Bug
Status	Resolved
Resolution	Done

Environment

Xcode 7.2, Swift 2.1

Additional Detail from JIRA


Votes	1
Component/s	Compiler
Labels	Bug
Assignee	@slavapestov
Priority	Medium

md5: 12ab5d036e835351aaf6c2f0e01d2b6d

is duplicated by:

SR-2428 Cannot use the short Array constructor syntax when creating an Array of a nested Struct
SR-3532 Can't access metatype of an array of nested types using square-bracket syntactic sugar
SR-4300 Getting error when declare empty array of nested struct or classes.

Issue Description:

I'm not sure the correct terminology to use here, but I've been playing around with moving my related enumerated types into the types they classify (nested enumerations in classes). When you do this, you need to refer to the enumeration as "ClassName.EnumerationName.Case" which seems to break down when using those in an array or dictionary.

class Class1 {
    enum NestedEnum: Int {
        case A
        case B
        case C
    }
}

class Class2 {
    var objectArray: [Class1.NestedEnum] = [Class1.NestedEnum]()
    var objectDictionary: [Class1.NestedEnum:Class1] = [Class1.NestedEnum:[Class1]]()
}

I've been able to workaround this issue by using a typealias to the enumerated value, but that seems clumsy.

swift-ci · 2016-02-17T11:45:51Z

Comment by Simon Whitty (JIRA)

Specifically, this only effects initializing an Array with the shorthand syntax.

//Error: invalid use of '()' to call a value of non-function type '[Card.Suit.Type]'
var a = [Card.Suit]()

//Works fine
var b = Array<Card.Suit>()
b.append(.Spades)

//also fine
var c : [Card.Suit] = Array<Card.Suit>()

ChristopherRogers · 2016-03-25T07:18:45Z

FWIW, I ran into this issue as well, but with nested type aliases instead of enums. So it seems that this issue affects the array & dictionary literal sugar syntax for all nested types.

public struct MyStruct {
    public typealias MyTypeAlias = String
}

// ERROR: Invalid use of '()' to call a value of non-function type '[MyTypeAlias.Type]' (with fix-it to delete '()')
_ = [MyStruct.MyTypeAlias]()

// ERROR: Cannot call value of non-function type '[MyTypeAlias.Type]' (without fix-it)
let _: [String] = [MyStruct.MyTypeAlias]()

_ = [] as [MyStruct.MyTypeAlias] // OK
let _: [MyStruct.MyTypeAlias] = [] // OK
_ = Array<MyStruct.MyTypeAlias>() // OK
_ = [GlobalTypeAlias]() // OK
_ = [String]() // OK

swift-ci · 2017-01-04T14:54:27Z

Comment by Philippe (JIRA)

I ran into this while accessing the metatype of an array of enums nested in a class, like this: [SomeClass.SomeEnum].type. I wrote some examples in this (now marked duplicate) issue if it helps anyone: SR-3532

slavapestov · 2017-05-22T22:50:50Z

#9765

swift-ci transferred this issue from apple/swift-issues Apr 25, 2022

This issue was closed.

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

[SR-349] Cannot use nested enums in definition of arrays or as dictionary #42969

[SR-349] Cannot use nested enums in definition of arrays or as dictionary #42969

swift-ci commented Dec 23, 2015

swift-ci commented Feb 17, 2016

ChristopherRogers commented Mar 25, 2016

swift-ci commented Jan 4, 2017

slavapestov commented May 22, 2017

[SR-349] Cannot use nested enums in definition of arrays or as dictionary #42969

[SR-349] Cannot use nested enums in definition of arrays or as dictionary #42969

Comments

swift-ci commented Dec 23, 2015

swift-ci commented Feb 17, 2016

ChristopherRogers commented Mar 25, 2016

swift-ci commented Jan 4, 2017

slavapestov commented May 22, 2017