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Category:Objective-C: Difference between revisions
added comment about assumption for code samples on RC
(Added paragraph at bottom about latest compiler (Clang), ARC, and other recent updates.) |
(added comment about assumption for code samples on RC) |
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As of October 2011, with the release of [http://developer.apple.com/library/ios/#documentation/DeveloperTools/Conceptual/WhatsNewXcode/Articles/xcode_4_2.html#//apple_ref/doc/uid/00200-SW1 XCode 4.2], Apple switched from [[gcc]] to [[wp:Clang|Clang]] as its default compiler. [[wp:Clang|Clang]]/[[wp:LLVM|LLVM]] offers competitive execution times, better compile times, improved error messages, and supports a simpler alternative syntax for expressing NSArray & NSDictionary literals and indexing. In the same release Apple also introduced automatic reference counting (ARC) which eliminates the need to manually release/retain memory. With ARC the compiler reports an error any time it encounters a call to release, autorelease, retain, or dealloc.
The release of Xcode 4.4 (4.5 for iOS) added [http://clang.llvm.org/docs/ObjectiveCLiterals.html syntax to specify literals] for <code>NSArray</code>, <code>NSDictionary</code>, <code>NSNumber</code>, and <code>NSString</code>, as well as subscript syntax to access elements of <code>NSArray</code> and <code>NSDictionary</code>.
Unless otherwise stated, Objective-C code samples will assume that they are compiled with ARC enabled, and that the compiler supports Objective-C literals.
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