Feedable protocol for Array of Photos

Feedable.swift

import Foundation

class Photo {
	let title: String
	
	init(title: String) {
		self.title = title
	}
}

protocol Feedable {
	var feedDescription: String { get }
}

extension Photo: Feedable {
	var feedDescription: String {
		return "A photo was added."
	}
}

extension _ArrayType where Generator.Element == Photo {
	var feedDescription: String {
		return "\(count) photos were added."
	}
}

let photo = Photo(title: "Photo 1")
let photos = [Photo(title: "Photo 2"), Photo(title: "Photo 3")]

let feedables: [Feedable] = [photo, photos]
for feedable in feedables {
	print(feedable.feedDescription)
}