Toll-Free Bridging

There are a number of data types in the Core Foundation framework and the Foundation framework that can be used interchangeably. This capability,called toll-free brIDging,means that you can use the same data type as the parameter to a Core Foundation function call or as the receiver of an Objective-C message. For example, NSLocale (see NSLocale Class Reference) is interchangeable with its Core Foundation counterpart,CFLocale (see CFLocale Reference). Therefore,in a method where you see an NSLocale * parameter,you can pass a CFLocaleRef,and in a function where you see a CFLocaleRef parameter,you can pass an NSLocale instance. You cast one type to the other to suppress compiler warnings,as illustrated in the following example.

NSLocale *gbNSLocale = [[NSLocale alloc] initWithLocaleIDentifIEr:@"en_GB"];

Note from the example that the memory management functions and methods are also interchangeable—you can use CFRelease with a Cocoa object and release and autorelease with a Core Foundation object.

Note: When using garbage collection,there are important differences to how memory management works for Cocoa objects and Core Foundation objects. See “Using Core Foundation with Garbage Collection” for details.

Toll-free brIDging has been available since Mac OS X v10.0. table 13-1 provIDes a List of the data types that are interchangeable between Core Foundation and Foundation. For each pair,the table also Lists the version of Mac OS X in which toll-free brIDging between them became available.

(#add莫非桥接的均以Ref结尾)

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