ARC = Automatic Reference Counting, introduced in iOS 5.
Currently, a struct used by the SPPoolObject does not comply with ARC.
For what it's worth I'd also like Sparrow to be ARC compatible. Not sure how much of a nightmare it is to change that struct though. I think you can replace it with a untyped pointer and do a little pointer manipulation wherever it gets used.
I also think it should be possible to do it that way! I'll report my progress here.
on SPPoolObject.h to compile on ios 5 to supply ARC.
Did you make any improvements for ARC?
Sorry, I haven't found the time yet to look at it! In any case, I recommend you make a few tests with that change, to see if the pool works as expected. (E.g. by adding NSLogs into the SPObjectPool class, then creating a few SPPoints, releasing them, and creating them again - to see if they are correctly recycled.)
So, after all this time, I'm finally back and working on the next update -- and thus, finally fixed the ARC issue: you can now use Sparrow with ARC projects.
The fix was rather simply, actually; similar to what omeryavuz tried, I exchanged the struct with a normal Objective-c class. That did the trick.
Here's the corresponding commit: 771f623