Re: Help with NSPointerArray and NSMapTable
Jonathan Dann <[email protected]>
| Newsgroups | gmane.comp.macosx.devel |
|---|---|
| Message-ID | <[email protected]> |
On 23 Sep 2009, at 01:27, Christiaan Hofman wrote: > > On Sep 23, 2009, at 1:25, Jonathan Dann wrote: > >> >> On 23 Sep 2009, at 01:10, Christiaan Hofman wrote: >> >> [snip] >> >>> Right, that's basically what I proposed as well. So I also need to >>> use this for simple types like CGFloat that are not pointer-sized? >> >> Yep. >> >> [snip] >> >>> Nice samples, that surely helps. Thanks. I just find it confusing >>> that for NSInteger it works differently. Though I guess I could do >>> the same. >> >> No problem. When you're doing this, you're not casting an integer >> to a pointer, so AFAICT the caveats in the 64-bit docs don't apply >> here. >> >> Jonathan > > As I understand it now, you do cast an integer to a pointer when you > use NSPointerFunctionsIntegerPersonality. So these caveats do apply. Yeah but you don't have to use the integer personality with integers or floats. If you have a struct with a single int then you can case between the struct and an int without loss of precision. I'm pretty sure that's what we're doing here. See: http://www.algorithm.com.au/downloads/talks/objective-c-internals/objective-c-internals.pdf > Christiaan >