Implementation of the Swift Identifiable protocol

Identifiable.swift

/// A class of types whose instances hold the value of an entity with stable identity.
protocol Identifiable {

    /// A type representing the stable identity of the entity associated with `self`.
    associatedtype ID: Hashable

    /// The stable identity of the entity associated with `self`.
    var id: ID { get }
}

extension Identifiable where Self: AnyObject {
    var id: ObjectIdentifier {
        return ObjectIdentifier(self)
    }
}