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NSRange is pretty useful when it comes to describing an interval. It’s used to say, “from X to, but not including, X+Y”. If you want such a range, then just type NSMakeRange (X, Y).

Invalid ranges are usually specified with: NSMakeRange (NSNotFound, 0)

Check for this with: if (range.location == NSNotFound) �

NSMaxRange(range) returns the next location after the range passed to it.

I have always been curious to why there is no NSZeroRange defined (like NSZeroPoint, NSZeroRect, NSZeroSize), then when writing this, I looked in the documentation, and surely it says:

ZeroRange: An NSRange set to 0 in location and length

But it’s not in any of the headers…

Well, not that it explains much, but I only see a reference to ZeroRange in the Cocoa Java documentation. Is it possible it’s only available in Java?

Apparently so. At least, it never worked in my entire minute of testing in an ObjectiveCee project.

It’s dead easy to add:

#define NSZeroRange NSMakeRange(0,0)

Or you could avoid setting yourself up for problems with getting into Apple’s namespace by using a variable of your own…

// in the header extern const NSRange MyZeroRange;

// in the implementation file NSRange MyZeroRange = {0, 0};

Or, you could use the magic of preprocessors using the following:

#ifndef NSZeroRange #define NSZeroRange NSMakeRange(0,0) #endif

You know, just in case they ever fix their oversight in the future.

The latter example wouldn’t actually protect you, since Apple favours defining such things as extern const values rather than as macros. So #ifndef NSZeroRange will always evaluate to true.