CODEWITHSUNDEEP
swiftparametersoverloading
BlackWolf
BlackWolf

Reputation: 5599

'Incorrect argument label' when method overloading in Swift

I am trying to do method overloading in Swift with the following code:

struct Game {
    private let players: [UserProfile] //set in init()
    private var scores: [Int] = []

    mutating func setScore(_ score: Int, playerIndex: Int) {

        //... stuff happening ...

        self.scores[playerIndex] = score
    }

    func setScore(_ score: Int, player: UserProfile) {
        guard let playerIndex = self.players.index(of: player) else {
            return
        }

        self.setScore(score, playerIndex: playerIndex)
    }
}

I am getting an error on the self.setScore line:

Incorrect argument labels in call (have _:playerIndex:, expected _:player:)

I have been looking at this code for a while now but can't figure out why this wouldn't work. Any hints?

Upvotes: 1

Views: 1292

Answers (1)

BlackWolf
BlackWolf

Reputation: 5599

Thanks to @Hamish for pointing me in the right direction.

Turns out that the compiler message is rather misleading. The problem is that every method that calls a mutating method must be mutating itself. So this solves the problem:

struct Game {
    private let players: [UserProfile] //set in init()
    private var scores: [Int] = []

    mutating func setScore(_ score: Int, playerIndex: Int) {

        //... stuff happening ...

        self.scores[playerIndex] = score
    }

    mutating func setScore(_ score: Int, player: UserProfile) {
        guard let playerIndex = self.players.index(of: player) else {
            return
        }

        self.setScore(score, playerIndex: playerIndex)
    }
}

Also see .sort in protocol extension is not working

Upvotes: 1

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