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I was going through “Pro. Objective-C Design Patterns for iOS” by Chung and found
_sharedSinglton = [[super allocWithZone: NULL] init];
I looked in Apple’s documentation for NSCopying as well, but can’t really understand what a ZONE really means.
NSZoneis obsolete now, but back in the NEXTSTEP days,NSZonewas an attempt to bring the concept of “malloc zones” into Cocoa. Here are some docs that described how it worked when it was enabled: http://www.cocoadev.com/index.pl?NSZone