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CHAPTER 25 MIXING C AND OBJECTIVE-C
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- (NSArray*)zombiesSortedByIntelligence { return [zombieArray sortedArrayUsingFunction:compareZombieBrains context:NULL]; } C functions can be defined anywhere outside of an Objective-C directive, or anywhere an Objective-C method can be defined. This means that you can mix C functions and Objective-C methods in an @implementation directive, but some programmers will group their C functions outside the @implementation. It s a matter of style. Your Objective-C application can call C APIs provided by the operating system, it can link to standard C libraries, and you can include C source modules in your project. This makes it easy to interface with the wide universe of POSIX functions, C frameworks, shared libraries, and open-source code.
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C functions in an Objective-C module (.m) are compiled as Objective-C code, not just C. The C function in Listing 25-1 sends Objective-C messages to objects just as if it were an Objective-C method. The only difference is that there is no object context (self). In this respect, a C function is the equivalent of a static class method in Java. When you add a C source file (.c) to your Xcode project, it will be compiled as plain C. The source file cannot include any Objective-C syntax. If you need to use Objective-C objects in a C module, you have two choices: Isolate the functions that use Objective-C objects and move them to an Objective-C (.m) source file. The file can consist entirely of C functions, but it will be compiled as Objective-C and can use Objective-C syntax to reference objects and send messages. Send Objective-C messages directly using one of the Objective-C runtime functions, such as objc_msgSend(id,SEL, ). The latter solution is awkward, but technically you can do anything in C that you can do in Objective-C. The entire Objective-C runtime is, after all, written in C. See the Objective-C 2.0 Runtime Reference1 for specific details.
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Core Foundation is a large library of C functions that are engineered around the concept of objects, which it terms opaque types or just types. These opaque types have an internal structure that is compatible with Objective-C objects, and a respectable number of Core Foundation types are interchangeable with Objective-C classes. This reciprocity is called the toll-free bridge. The goal of Core Foundation is to seamlessly provide a large number of operating system and framework services to both C and Objective-C programmers. C programmers use CFTypeRef values, which are pointers to opaque data structures, and pass them to Core Foundation functions. Objective-C programmers store object pointers and send them messages. The code executed is the same in both cases. Most Core Foundation types do not have a toll-free bridge to Objective-C. If you need their functionality, you ll need to use the Core Foundation data types and functions directly. Core Foundation employs many of the same concepts as Objective-C, it just implements them with its own types,
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1 Apple Inc., Objective-C 2.0 Runtime Reference, http://developer.apple.com/documentation/ Cocoa/Reference/ObjCRuntimeRef/, 2008.
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CHAPTER 25 MIXING C AND OBJECTIVE-C
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functions, and terminology. A comparison of common Core Foundation types and functions along with their Objective-C equivalents are listed in Table 25-1. Table 25-1. Core Foundation Terminology
Objective-C
Class id or NSObject* NSString* [t class] [t1 isEqual:t2] [t description] [t retain] [t release]
Core Foundation
CFTypeID CFTypeRef CFStringRef CFGetTypeID(t) CFEqual(t1,t2) CFCopyDescription(t) CFRetain(t) CFRelease(t)
A Core Foundation type is an identifier that is conceptually equivalent to an Objective-C class. A Core Foundation reference, or ref for short, is an instance of a type, functionally identical to an identifier (id) or object pointer. Types are organized in an inheritance hierarchy just like classes. CFStringRef is a subtype of CFTypeRef, just as NSString is a subclass of NSObject. A CFStringRef can be passed to any function that accepts a CFStringRef or a CFTypeRef parameter, just as an NSString object will respond to any message defined for NSString or NSObject.
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