On Feb 22, 2009, at 5:16 PM, Christiaan Hofman wrote:
The DictionaryExample.c in /Developer/Examples/CoreFoundation shows how to use a CFDictionary for integers. If you want to make it 64 bit clean, use long/uintptr_t/intptr_t instead of int. For integer arrays or sets, STL is probably a better choice...The CFDictionary code is very old, and in view of the 64 bit docs wrong, so that's not a relevant reference, IMHO.
Can you be more specific? I use the technique pretty frequently, so I'd definitely like to know if it's going to break on me! The 64 bit transition guide says to avoid casting pointers to non-pointer types, but that's a different problem.
Using things like intptr etc generally I consider hackish, you always have to be very careful with sizes. This method is always valid, and is really the way CF collections are designed.
Yeah, you have to be careful with sizes, but sizeof(void *) == sizeof (uintptr_t) == sizeof(long). Since CF collections are required to work correctly with pointer sizes, I think it will always be valid to use an equivalent-sized value...unless I miss something. If you use malloc, you might as well use an NSNumber and avoid all the CF stuff, since you're taking the performance hit anyway.
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