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What is a delegate A delegate is a way to simplify the separation of processing logic from another class It also avoids inheritance For instance, subclassing the UIApplication object would be painful Instead, Apple provides a UIApplicationDelegate The UIApplication has a reference to the class implementing the UIApplicationDelegate If implemented, the UIApplication delegates handling of an event to the appropriate method in the UIApplicationDelegate It appears as if UIApplication is handling the event; in reality, its delegate, UIApplicationDelegate, handles the event Delegates are a common object-oriented design pattern For more information on delegates and object-oriented programming, refer to the delegation pattern on Wikipedia (wwwwikipediaorg)

{ TreeWalker *walker = (TreeWalker *) context; [walker handleNewElement: element inParser: parser]; } // someElementCallback

16 It requires two discount rates instead of one, and generally neither of them are empirically observable

In the AddViewProject project, open mainm in the Other Sources folder in the Navigation pane The file s code is listed in Listing 6-3

You can see that the context pointer is cast to an object pointer, and messages are sent to that object.

6:

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C++ has a lot of features that Objective-C lacks: multiple inheritance, namespaces, operator overloading, templates, class variables, abstract classes, STL (Standard Template Library), and so on. If you miss these, Objective-C has features and techniques that can replace, or at least simulate, them. For example, you can use categories and protocols as a form of multiple inheritance or for implementing abstract base classes. One common use for multiple inheritance is to provide an interface so that other code can invoke particular methods on your object. Categories and protocols are perfect for this situation. You can use protocols to provide pure abstract base classes. Categories and protocols won t help you if you re using multiple inheritance to bring in extra instance variables (called member variables in C++). To do this, you can use composition to include an object in another object and then use stub methods to redirect messages to the second object (which is a common technique in Java). You can also simulate multiple inheritance by overriding the forwardInvocation: method. This method gets called if a message is received that the object doesn t know how to handle. By examining the NSInvocation object, you can see if it should be forwarded on to your multiply inherited object and then send it if necessary. This technique saves you from having to write a lot of little stub methods. However, it s much slower than real multiple inheritance and can be a pain to set up. Other conventions can replace still more C++ features, such as stub methods that call abort for abstract classes that shouldn t be instantiated, though some features have weak replacements, such as name prefixes instead of namespaces.

Listing 6-3

#import <UIKit/UIKith> int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; }

One of the biggest differences between C++ and Objective-C is the mechanism of dispatching methods (or member functions, as they re known in C++). C++ uses a vtable-based mechanism for determining what code to invoke for virtual functions.

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