Cocoa Fundamentals Guide: Table

**Table 2-5** Data types that can be used interchangeably between Core Foundation and Foundation
Core Foundation type	Foundation class	Availability
`CFArrayRef`	`NSArray`	Mac OS X v10.0
`CFAttributedStringRef`	`NSAttributedString`	Mac OS X v10.4
`CFCalendarRef`	`NSCalendar`	Mac OS X v10.4
`CFCharacterSetRef`	`NSCharacterSet`	Mac OS X v10.0
`CFDataRef`	`NSData`	Mac OS X v10.0
`CFDateRef`	`NSDate`	Mac OS X v10.0
`CFDictionaryRef`	`NSDictionary`	Mac OS X v10.0
`CFErrorRef`	`NSError`	Mac OS X v10.5
`CFLocaleRef`	`NSLocale`	Mac OS X v10.4
`CFMutableArrayRef`	`NSMutableArray`	Mac OS X v10.0
`CFMutableAttributedStringRef`	`NSMutableAttributedString`	Mac OS X v10.4
`CFMutableCharacterSetRef`	`NSMutableCharacterSet`	Mac OS X v10.0
`CFMutableDataRef`	`NSMutableData`	Mac OS X v10.0
`CFMutableDictionaryRef`	`NSMutableDictionary`	Mac OS X v10.0
`CFMutableSetRef`	`NSMutableSet`	Mac OS X v10.0
`CFMutableStringRef`	`NSMutableString`	Mac OS X v10.0
`CFNumberRef`	`NSNumber`	Mac OS X v10.0
`CFReadStreamRef`	`NSInputStream`	Mac OS X v10.0
`CFRunLoopTimerRef`	`NSTimer`	Mac OS X v10.0
`CFSetRef`	`NSSet`	Mac OS X v10.0
`CFStringRef`	`NSString`	Mac OS X v10.0
`CFTimeZoneRef`	`NSTimeZone`	Mac OS X v10.0
`CFURLRef`	`NSURL`	Mac OS X v10.0
`CFWriteStreamRef`	`NSOutputStream`	Mac OS X v10.0