benchmark

gistfile1.txt

func benchmark<T>(label:String, body:()->T) {
    var info = mach_timebase_info_data_t(numer: 0, denom: 0)
    mach_timebase_info(&info)
    
    let tick = mach_absolute_time()
    let res = body()
    let tock = mach_absolute_time()
    let delta = tock - tick
    
    let nanos = delta * UInt64(info.numer) / UInt64(info.denom)
    let seconds = Double(nanos) / Double(NSEC_PER_SEC)

    "\(label) returned \(res) in \(seconds) seconds"***
}