delegation

I'm sorry, i was not able to formulate a short question for the title.. In case i subclass a class with a delegate protocol and property, does my delegate still need to implement the delegate protocol of the superclass, or do i have to define a new one for the subclass? In my case I subclassed UIImagePickerController : [(UIImagePickerController *)self.myUIImagePickerControllerSubclassInstance setDelegate:self]; When I try to set its delegate to self , from some view controller I get the following warning: warning: Semantic Issue: Sending 'ViewController *' to parameter of incompatible type 'id

Made this example: https://jsfiddle.net/d8ak0edq/2/ document.getElementById('outer').oncontextmenu = function() { return false; }; outer = document.getElementById('outer'); outer.addEventListener('mousedown', foo); function foo(evt) { if (evt.which === 1) { evt.target.style.backgroundColor = 'red'; } else if (evt.which === 3) { evt.target.style.backgroundColor = 'blue'; } } /* $outer = $('#outer'); $outer.on('mousedown', 'div', foo); function foo(evt) { if (evt.which === 1) { $(this).css('background-color', 'red'); } else if (evt.which === 3) { $(this).css('background-color', 'blue'); } } */

I have subclass a UITableViewCell as follows: @class MyCell; @protocol MyCellDelegate - (void) viewController:(MyCell*)viewCon userId:(NSNumber*)uid andType:(NSString*)type; @end @interface MyCell : UITableViewCell <MHLazyTableImageCell>{ id <MyCellDelegate> delegate; NSNumber * mid; NSNumber * uid; } - (IBAction) star:(id) sender; - (IBAction) reply:(id) sender; - (IBAction) message:(id) sender; - (void) showMenu; @property (nonatomic, retain) id <ConvoreCellDelegate> delegate; @property (nonatomic, retain) NSNumber * mid; @property (nonatomic, retain) NSNumber * uid; the delegate is called

In OOP, a term delegation is mentioned. How is this modelled in a class? I searched on yahoo etc but got links to delegates. Imagine you have the classes Car and Engine : public class Car { private Engine engine = new Engine(); //or inject it externally public void start() { engine.start(); } } In this example the Car delegates to the underlying Engine . The user of the car cannot directly start the engine (unless he is a mechanic). But he can tell the car to start, and the car in turn tells the engine to start. You'd want to use it whenever you use object composition and you need to use a

On page 65 and 66 of Java Concurrency in Practice Brian Goetz lists the following code: @ThreadSafe public class DelegatingVehicleTracker { private final ConcurrentMap<String, Point> locations; private final Map<String, Point> unmodifiableMap; public DelegatingVehicleTracker(Map<String, Point> points) { locations = new ConcurrentHashMap<String, Point>(points); unmodifiableMap = Collections.unmodifiableMap(locations); } public Map<String, Point> getLocations() { return unmodifiableMap; } public Point getLocation(String id) { return locations.get(id); } public void setLocation(String id, int x,

We've recently released the latest version of our intranet application, which now uses windows authentication as standard, and needs to be able to connect to a configured SQL server with the end-user's domain credentials. Lately we've found that on a couple of customer deployments, although IIS can see the user's domain credentials, it will not pass these on to SQL server. Instead, it seems to use the anonymous account. This is in spite of following all the correct steps (changing the directory security to Win Auth, updating Web.Config to use Win Auth and denying anonymous users). I've been

I've got an ASP.NET web application which uses Windows Authentication. This application needs to connect to another ASP.NET web service (which also uses Windows Authentication) and use the same credentials that it received from the user's browser. Can this be done and how? I don't believe you can do this without Kerberos Authentication. You can't delegate credentials to another system. I think this will start to set you on the right track. 来源： https://stackoverflow.com/questions/1600521/asp-net-passing-along-windows-authentication-credentials