This function isn't something which comes with Foundation, it is supplied by the BSD libraries on Darwin, but those aren't present on Linux.
I recommend looking for a Swift implementation of a high-quality RNG which will meet your needs, rather than trying to rely on a non-portable implementation coming from the base OS. - Daniel > On May 22, 2017, at 8:44 AM, Edward Connell via swift-users > <swift-users@swift.org> wrote: > > 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 > #endif > > > public func random_uniform(range: Int) -> Int { > guard range > 0 else { return 0 } > #if os(Linux) > return Int(random()) % range > #else > return Int(arc4random_uniform(UInt32(range))) > #endif > } > > > Thanks, Ed > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users _______________________________________________ swift-users mailing list swift-users@swift.org https://lists.swift.org/mailman/listinfo/swift-users