Is there a way to do Swift's Protocol Composition in Kotlin

Question

So for Swift we can create new types or pass to a method as a parameters using the & operator.

Example Swift Code:

protocol Fooable {}
protocol Barable {}

// the new protocol
typealias FooBarable = Fooable & Barable

// method parameter 
func doSomethingFor(object: Fooable & Barable) { ... }

Is there a way to do this in Kotlin's Interfaces?

• Kotlin Interfaces Documentation
• Swift Protocols Documentation

Answer 1

Please check the below code:

interface A{

}

interface B{

}

fun <T> check(variable: T) where T : A, T: B{
    print("Hello");
}

the above gives you compile time error if you try to pass a variable which doesn't confirm to both of them

Answer 2

From the function side you'd be able to handle it with generic functions using a where-clause:

fun <T> foo(obj: T) where T: Fooable, T: Barable {
    ...
}