If category is used, you can use same class, no need to remember a new class-name. Category created on a base class is available on sub classes.
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In the context of an NSOperation object, which runs in an NSOperationQueue, the terms concurrent and non-concurrent do not necessarily refe...
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Please read from below link. Tutorial : Click Here Complex Queries in SQL Link 1 Link 2
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This borrows very much from C/C++. It allows you to alias a type, which can be useful in many particular contexts. typealias AudioSample ...