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simple nanosecond timer using mach_absolute_time
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/* | |
var t = Timer() | |
t.start() | |
// do something | |
t.stop() | |
println("took \(t.seconds)") | |
*/ | |
import Darwin | |
struct Timer { | |
static var base: UInt64 = 0 | |
var startTime: UInt64 = 0 | |
var stopTime: UInt64 = 0 | |
init() { | |
if Timer.base == 0 { | |
var info = mach_timebase_info(numer: 0, denom: 0) | |
mach_timebase_info(&info) | |
Timer.base = UInt64(info.numer / info.denom) | |
} | |
} | |
mutating func start() { | |
startTime = mach_absolute_time() | |
} | |
mutating func stop() { | |
stopTime = mach_absolute_time() | |
} | |
var nanoseconds: UInt64 { | |
return (stopTime - startTime) * Timer.base | |
} | |
var milliseconds: Double { | |
return Double(nanoseconds) / 1_000_000 | |
} | |
var seconds: Double { | |
return Double(nanoseconds) / 1_000_000_000 | |
} | |
} |
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