Swift Tutorial - Tutorialspoint

When we run the above program using playground, we get the following result:

res is: 20

res is: 30

res is: 50

Protocol Composition

Swift allows multiple protocols to be called at once with the help of protocol composition.

Syntax

protocol<SomeProtocol, AnotherProtocol>

Example

protocol stname {

var name: String { get }

}

protocol stage {

var age: Int { get }

}

struct Person: stname, stage {

var name: String

var age: Int

}

func print(celebrator: protocol<stname, stage>) {

println("\(celebrator.name) is \(celebrator.age) years old")

}

let studname = Person(name: "Priya", age: 21 )

print(studname)

let stud = Person(name: "Rehan", age: 29 )

print(stud)