How to detect if client system is 32 or 64 bit?

Question

How would one detect if a client system is 32 or 64 bit in Swift?

I wasn't able to find anything in documentation and I had a hard time finding a solution. Therefore posting the answer below.

Answer 1

The size of Int is guaranteed to be the same as platform’s native word size. see the docs.

So this should works:

let bit = sizeof(Int) * Int(BYTE_SIZE)
let is64bit = sizeof(Int) == sizeof(Int64)
let is32bit = sizeof(Int) == sizeof(Int32)

Answer 2

swift 4 let is64bit = Int.bitWidth == Int64.bitWidth