How to subclass an array class in Swift?

Question

I am new in Swift. I have a base class:

class foo{}

I want to implement a foo collection class:

class foos: Array{}
         


        

Answer 1

In Swift 2.x you can use a protocol extension.

class Foo : Equatable {}
// you need to provide the Equatable functionality
func ==(leftFoo: Foo, rightFoo: Foo) -> Bool {
    return ObjectIdentifier(leftFoo) == ObjectIdentifier(rightFoo)
}

extension Array where Element : Foo {}

protocol extensions provide "insert points" to extend classes that aren't classes, classes you don't own, etc.