Question

I have a piece of code that the ARC converter turned into this…

// firstRange is a NSRange obviously
// test is an NSString * passed in as parameter to the method
NSRange range = NSMakeRange(firstRange.location, (lastRange.location - firstRange.location) + lastRange.length);
NSString *sentence = [text substringWithRange:range];
// OK, now chop it up with the better parser
CFRange allTextRange = CFRangeMake(0, [sentence length]);
CFLocaleRef locale = CFLocaleCopyCurrent();
CFStringTokenizerRef tokenizer = CFStringTokenizerCreate(kCFAllocatorDefault,
  (__bridge CFStringRef) sentence,
  allTextRange,
  kCFStringTokenizerUnitWord,
  locale);

I call this A LOT and I suspect that it leaks somehow. Is that CFStringTokenizerCreate call kosher? I am especially suspicious of the __bridge call. Do I create an intermediate that I have to manually release or some such evil?

Answer 1

You need to CFRelease the tokenizer and locale or else they will leak.

This falls under Core Foundation Ownership Policy and has nothing to do with ARC.

The __bridge cast tells ARC that no ownership transfer is done for sentence in CFStringTokenizerCreate call. So that is Ok.

You can test for memory leaks with Xcode’s static analyser and profiler.