algal

//
// Set
//

struct MySet<KeyType : Hashable> : Sequence
{
  var dictionaryOfItems = Dictionary<KeyType,Bool>()
  
  init() {}
  init(array:Array<KeyType>) {

algal

class Bag<T: Hashable>: Sequence, Printable {
    var _storage = Dictionary<T, Int>()
      typealias GeneratorType = Dictionary<T,Int>.GeneratorType
  
    func addItem(item: T) {
        if let count = _storage[item] {
            _storage[item] = count + 1
        } else {
            _storage[item] = 1
        }

algal

class Box<T> {
  let unbox:T
  init(unbox:T) { self.unbox = unbox }
}

/*

Boxing is necessary because Swift does not allow recursive enum types.

However, AFAICT, is it also desirable here because it enables structural

algal

/*

The examples below show two ways to model a state machine with two states,
On and Off, with an additional constant Int property.

On -> Off and Off -> On transitions must be inititated by calling flip()

*/

algal

extension UIColor 
{
  convenience init(RGBValue:UInt32) 
  {
    let red = (RGBValue & 0xFF0000) >> 16
    let green = (RGBValue & 0x00FF00) >> 8
    let blue = (RGBValue & 0x0000FF) >> 0
    self.init(red:CGFloat(red)/255.0,green:CGFloat(green)/255.0,blue:CGFloat(blue)/255.0,alpha:CGFloat(1.0))
  }
}

algal

/// Not sure why this generic version does not work.
private class WrapperTableViewCell<T:UIView> : UITableViewCell
{
    class var classReuseIdentifier:String { return T.self.description() + "CellIdentifier" }
    
    override class func requiresConstraintBasedLayout() -> Bool { return true }
    
    override init(style: UITableViewCellStyle, reuseIdentifier: String?)
    {
        super.init(style: UITableViewCellStyle.Default, reuseIdentifier: reuseIdentifier)

algal

//
//  NSString+RelativePaths.m

#import "NSString+RelativePaths.h"


/**
 
 Returns a path to resourcePath, relative to anchorPath.
 

algal

//
// MARK: generic networking and JSON-decoding helper
//

// give it a NSURLRequest and a session, it gives you back a aresult with an AnyObject or an NSError  

public class JSONService
{
  /// returns JSON result on statusCode 200, and an error otherwise
   public class func taskWithJSONRequest(

algal

private extension NSURLComponents
{
  func withQueryItem(name:String,intValue:Int) -> NSURLComponents {
    return self.withQueryItem(name, stringValue: NSNumber(integer: intValue).stringValue)
  }
  
  func withQueryItem(name:String,floatValue:Float) -> NSURLComponents {
    return self.withQueryItem(name, stringValue: NSNumber(float: floatValue).stringValue)
  }
  

algal

/// Save image in an in-memory URL
func toURL(image:UIImage) -> NSURL
{
  let img  = image
  let imgData:NSData = UIImagePNGRepresentation(img)
  let dataFormatString = "data:image/png;base64,%@"
  let dataString = String(format: dataFormatString, imgData.base64EncodedStringWithOptions(.allZeros))
  let dataURL = NSURL(string: dataString)!
  return dataURL
}