A Simple AnyHashable Implementation

MyAnyHashable.swift

protocol HashableBox {
	
	func unbox<T : Hashable>() -> T?
	
	var hashValue: Int {get}
	func isEqual(_ other: HashableBox) -> Bool
	
}

struct ConcreteHashableBox<Base : Hashable> : HashableBox {
	
	let originalValue: Base
	
	func unbox<T : Hashable>() -> T? {
		return originalValue as? T
	}
	
	var hashValue: Int {
		return originalValue.hashValue
	}
	
	func isEqual(_ other: HashableBox) -> Bool {
		guard let otherAsBase: Base = other.unbox() else {return false}
		return otherAsBase == originalValue
	}
	
}

struct MyAnyHashable : Hashable {
	
	let box: HashableBox
	
	init<T : Hashable>(_ object: T) {
		box = ConcreteHashableBox(originalValue: object)
	}
	
	var hashValue: Int {
		return box.hashValue
	}
	
	static func ==(_ lhs: MyAnyHashable, _ rhs: MyAnyHashable) -> Bool {
		return lhs.box.isEqual(rhs.box)
	}
	
}