CODEWITHSUNDEEP
arraysswiftlisttypesappend
潘九龙
潘九龙

Reputation: 3

Cannot invoke 'append' with an argument list of type '([T.T])'

protocol UtimesListResponseProtocol:HandyJSON{
    associatedtype T
    var slide: Int {get set}
    var top: String {get set}
    var bottom: String {get set}
    var hasMore: Bool {get set}
    var list: [T] {get set}

    func add<M:UtimesListResponseProtocol>(data:M)
}
extension UtimesListResponseProtocol{
    mutating func add<T:UtimesListResponseProtocol>(data:T){
        slide = data.slide
        top = data.top
        bottom = data.bottom
        hasMore = data.hasMore
        list.append(data.list)
    }
}

I want to add a method of adding arrays in the protocol, but it doesn't seem to work. What should I do, mainly because the data types in array are also generics, what should I do

Upvotes: 0

Views: 52

Answers (1)

David Pasztor
David Pasztor

Reputation: 54735

You have 2 issues: first of all, you need to call append(contentsOf:) if you want to append an Array to another. Secondly, you need to make sure the generic type parameters match, since Arrays in Swift can only contain elements of the same type.

extension UtimesListResponseProtocol{
    mutating func add<List:UtimesListResponseProtocol>(data:List) where List.T == T {
        slide = data.slide
        top = data.top
        bottom = data.bottom
        hasMore = data.hasMore
        list.append(contentsOf: data.list)
    }
}

Upvotes: 1

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