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

You can implement your own UInt128 type. Or use NSDecimalNumber

To implement UInt128

struct UInt128 {
    var low : UInt64 = 0;
    var high : UInt64 = 0;
}

and you can implement operators

infix func + (l: UInt128, r: UInt128) -> UInt128 {
    // do your work... care with overflow 
}