Protocol-Static-Example.swift

protocol A {
    static func doSomething() -> String
    static func aFuncWith(param: String) -> String
}

extension A {
    static func aFuncWith(param: String = "default") -> String {
        return param
    }
}

struct B: A {
    static func doSomething() -> String {
        return "doin it!"
    }

    static func aFuncWith(param: String) -> String {
        param
    }
}

B.aFuncWith()
B.aFuncWith(param: "hello")

enum C: A {
    static func doSomething() -> String {
        return "doin it!"
    }
}

class MyClass {
    let aType: A.Type

    init(aType: A.Type) {
        self.aType = aType
    }

    func doSomething() -> String {
        return aType.doSomething()
    }
}

struct MyStruct {
    let aType: A.Type

    init(aType: A.Type = B.self) {
        self.aType = aType
    }

    func doSomething() -> String {
        return aType.doSomething()
    }
}

let myClass = MyClass(aType: C.self)
print(myClass.doSomething())

let myStruct = MyStruct(aType: C.self)
print(myStruct.doSomething())


let myOtherStruct = MyStruct()

myOtherStruct.doSomething()