swift - Generic #2 (Generic Type)

Generic Type

struct Color<T> {
    var red: T
    var green: T
    var blue: T
}

let c = Color(red: 128, green: 80, blue: 200)

// Color<Int> 형식이기 때문에 에러
// c = Color(red: 128.0, green: 80.0, blue: 200.0)

let d: Color = Color(red: 128.0, green: 80.0, blue: 200.0)

let arr: Array<Int>

let dict : Dictionary<String, Double>



extension Color where T == Int {
    func getComponents() -> [T] {
        return [red, green, blue]
    }
}

let intColor = Color(red: 1, green: 2, blue: 3)
intColor.getComponents()

// T == Int 에 false기 때문에 에러
// let dblColor = Color(red: 1.0, green: 20.0, blue: 3.0)
// dblColor.getComponents()