Is there a number type with bigger capacity than u_long/UInt64 in Swift?

Question

Is there a type with bigger capacity than u_long or UInt64 in Swift?

I have a function that takes very big integers to identify a credit card numbe

Answer 1

Another approach would be to work with strings, and define the mathematical operators to operate on strings also:

func +(lhs: String, rhs: Int8) -> String
func +(lhs: String, rhs: Int16) -> String
func +(lhs: String, rhs: Int32) -> String
func +(lhs: String, rhs: Int64) -> String
func +(lhs: String, rhs: String) -> String
// ... other operators

This has the advantage of theoretically allowing and unlimited number of digits, but has the disadvantage of the fact that the strings might not always represent numbers.