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NSLog Macro

This is a useful marco for doing debug logging:

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#define DLog(msg, ...) do { \
  NSString *dLogString = [NSString stringWithFormat:@"%s: %@", __PRETTY_FUNCTION__, msg]; \
  NSLog(@"%@", __VA_ARGS__); \
} while (0)

Note the use of __PRETTY_FUNCTION__

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