1import Foundation
2
3/// A basic profiler for timing operations.
4///
5/// This is based on some code written by JeremyP on Stack Overflow.
6/// See https://stackoverflow.com/a/24755958/1558022
7/// 
8struct Timer {
9    private let start: DispatchTime
10    private var elapsed: DispatchTime
11    
12    init() {
13        self.start = DispatchTime.now()
14        self.elapsed = start
15    }
16    
17    mutating func printTime(_ label: String) -> Void {
18        let now = DispatchTime.now()
19
20        let totalInterval = Double(now.uptimeNanoseconds - self.start.uptimeNanoseconds) / 1_000_000_000
21        let elapsedInterval = Double(now.uptimeNanoseconds - self.elapsed.uptimeNanoseconds) / 1_000_000_000
22
23        self.elapsed = now
24        
25        print("Time to \(label):\n  \(elapsedInterval) seconds (\(totalInterval) total)")
26    }
27}