NSInteger and NSUInteger in a mixed 64bit / 32bit environment

ios objective-c 64-bit arm64
Pieter picture Pieter · Dec 3, 2013 · Viewed 16.8k times · Source

I have a fair amount of string format specifiers in NSLog / NSAssert etc. calls which use %d and %u with NSInteger (= int on 32bit) and NSUInteger (= unsigned int on 32bit) types respectively.

When converting the app to 64bit, this gives warnings (of course), as %ld %lu is expected for what now became a long and unsigned long type.

Simply converting the format specifiers will of course introduce the reverse warnings in the 32bit build.
So the only solution I see to become warning free is using the 64bit specifiers, and casting to the 64bit value types everywhere a warning is given in the 32bit build.

But I was wondering if perhaps there are format specifiers specifically for the NSInteger and NSUInteger type which would work on both architectures without casting?

Answer

ilya n. picture ilya n. · Dec 3, 2013

I think the safest way is to box them into NSNumber instances.

NSLog(@"Number is %@", @(number)); // use the highest level of abstraction

This boxing doesn't usually have to create a new object thanks to tagged pointer magic.

If you really don't want to use NSNumber, you can cast primitive types manually, as others suggested:

NSLog(@"Number is %ld", (long)number); // works the same on 32-bit and 64-bit

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