[swift-users] arc4random_uniform on Linux is missing from Foundation??

Edward Connell ewconnell at gmail.com
Mon May 22 10:44:18 CDT 2017

Any ideas when Foundation on Linux will support arc4random_uniform? This is
kind of an important function.
There doesn't seem to be any decent substitute without requiring the
installation of libbsd-dev, which turns out to be messy. Currently I am
doing this, but glibc random with mod does not produce good quality
numbers, due to modulo bias.

Has anyone come up with a better solution to get a true uniform
distribution that isn't super messy?

import Foundation

#if os(Linux)
import Glibc

public func random_uniform(range: Int) -> Int {
guard range > 0 else { return 0 }
#if os(Linux)
 return Int(random()) % range
return Int(arc4random_uniform(UInt32(range)))

Thanks, Ed
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