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- (NSString *) hostname
{
    char baseHostName[256]; // Thanks, Gunnar Larisch
    int success = gethostname(baseHostName, 255);
    if (success != 0) return nil;
    baseHostName[255] = '\0';
    
    return [NSString stringWithFormat:@"%s", baseHostName];
}

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class FontSizesDataSource: UITableViewDataSource {

    private  let fontSizeMultiplierDescriptions: [FontSizeMultiplier] = [.small, .normal, .large, .extraLarge]
    
    var numberOfSections: Int {
        return 1
    }
    
    func numberOfItemsInSection(index: Int) -> Int {
        return fontSizeMultiplierDescriptions.count

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extension UINavigationController {
   
   open override var preferredStatusBarStyle: UIStatusBarStyle {
      return topViewController?.preferredStatusBarStyle ?? .default
   }
}

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import Foundation
import CommonCryptoKit

enum CryptoAlgorithm {
    case MD5, SHA1, SHA224, SHA256, SHA384, SHA512
    
    var HMACAlgorithm: CCHmacAlgorithm {
        var result: Int = 0
        switch self {
        case .MD5:      result = kCCHmacAlgMD5

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class Dynamic<T> {
  typealias Listener = T -> Void
  var listener: Listener?
  
  func bind(listener: Listener?) {
    self.listener = listener
  }
  
  func bindAndFire(listener: Listener?) {
    self.listener = listener

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extension UIView {
    func xscale() -> CGFloat {
        let t = self.transform
        return sqrt(t.a * t.a + t.c * t.c)
    }
    
    func yscale() -> CGFloat {
        let t = self.transform
        return sqrt(t.b * t.b + t.d * t.d);
    }

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        let defaultOptions: [String: AnyObject] = [
            "NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints": true
        ]
        NSUserDefaults.standardUserDefaults().registerDefaults(defaultOptions)

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class AccessibilityBarButtonItem: UIBarButtonItem {
    @IBInspectable override var accessibilityLabel: String? {
        get { return super.accessibilityLabel }
        set { super.accessibilityLabel = accessibilityLabel }
    }
}

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class ReplaceSegue: UIStoryboardSegue {
    
    override func perform() {
        let containerViewController = sourceViewController
        if containerViewController.childViewControllers.count == 0 {
            return;
        }
        
        let sourceVC = containerViewController.childViewControllers[0]
        containerViewController.addChildViewController(destinationViewController)

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import UIKit

class ExpenseListViewController : UITableViewController, UITableViewDataSource, UITableViewDelegate {
    
    struct TableViewCellIdentifiers {
        static let BasicCell = "BasicCell"
    }
    
    // MARK: - UITableViewDataSource