multicastdelegate

I am trying to implement the multicast delegate functionality in Swift. In Objective C, we have this excellent implementation https://github.com/robbiehanson/XMPPFramework/blob/master/Utilities/GCDMulticastDelegate.m And I have just created this basic functionality: protocol MyProtocol : class{ func testString()-> String; } class MulticastDelegateNode <T:AnyObject> { weak var delegate : T? init(object : T){ self.delegate = object; } } class MulticastDelegate <T:AnyObject> { var delegates = Array<MulticastDelegateNode<T>>() func addDelegate(delegate : T){ var newNode = MulticastDelegateNode

When is it useful to have multicast delegates over singlecast delegates? I use delegates a lot, mainly coupled with C# lambdas, but I've never felt the urge to use the multicast aspect of C# delegates, ie I've never wanted to combine multiple delegates together in a single delegate. I'm therefore very curious in what sort of situation multicast delegates are useful - I can only think of examples in which you can easily implement the functionality some other way, by, say, chaining the delegates or putting them in a list. In particular, Eric Lippert's answer here gives the impression even the C#

I think the answer is NO? If there isn't, why do we have separated Delegate and MulticastDelegate classes? Maybe it's again because of "some other .NET languages"? EDIT: I thought this was part of ECMA 335, but I can't see it in there anywhere. You can't create such a delegate type in C#, but you can in IL: .class public auto ansi sealed Foo extends [mscorlib]System.Delegate { // Body as normal } The C# compiler has no problems using such a delegate: using System; class Test { static void Main() { Foo f = x => Console.WriteLine(x); f("hello"); } } But the CLR does when it tries to load it:

I have gone through many articles but I am still not clear about the difference between the normal delegates that we usually create and multicast delegates. public delegate void MyMethodHandler(object sender); MyMethodHandler handler = new MyMethodHandler(Method1); handler += Method2; handler(someObject); The above delegate MyMethodHandler will call these two methods. Now where does multicast delegates come in. I have read that they can call multiple methods but I am afraid that my basic understanding about delegates is not correct. This article explains it pretty well: delegate void Del