How to extend a protocol that satisfies Multiple Constraints - Swift 2.0

Question

I am trying to provide a default implementation of protocol so it can satisfy multiple constraints from other protocols.

Given the following protocols:

public protocol Creature {     var name: String { get }     var canMove: Bool { get } }  public protocol Animal: Creature {}  public protocol Moveable {     var movingSpeed: Double { get set } }  public protocol Agend {     var aged: Int { get } } 

I'm able to extend using a single condition on Self:

// all animals can move extension Moveable where Self: Animal {     public var canMove: Bool { return true } } 

But how do I set constraints to provide a default Moveable implementation for types that conform to both Animal and Aged protocols? Something like below? Or is there some "add" "or" option for the where clause?

// Pseudocode which doesn't work extension Moveable where Self: Animal && Self: Aged {     public var canMove: Bool { return true } } 

Answer 1

You could use a protocol composition:

extension Moveable where Self: protocol<Animal, Aged> {     // ...  } 

Or just add the conformances one after the other:

extension Moveable where Self: Animal, Self: Aged {     // ...  }