public enum Color: UInt8, CustomStringConvertible {
	case Black = 0
	case White = 1

	public var description: String {
		return switch self {
		case .Black: "b"
		case .White: "w"
		}
	}

	public static prefix func ! (rhs: Self) -> Self {
		return rhs == .White ? .Black : .White
	}
}