Re: How determine if file is in Trash, given Path or Alias
Re: How determine if file is in Trash, given Path or Alias
- Subject: Re: How determine if file is in Trash, given Path or Alias
- From: "Sean McBride" <email@hidden>
- Date: Wed, 3 Jun 2009 10:13:59 -0400
- Organization: Rogue Research Inc.
On 6/2/09 10:17 PM, Michael Ash said:
>>>The description of [NSString UTF8String] says
>>>that "the returned C string is automatically freed just as a returned
>>>object would be released", which implies (to me) that the returned
>>>pointer is to GC-controlled memory.
>>
>> Then shouldn't its return value be __strong? (It's not.)
>
>Not really. __strong has no meaning when applied to function/method
>return values (or arguments or local variables). It doesn't break
>anything, but it also doesn't do anything. __strong only changes how
>things work when applied to heap memory, such as instance variables,
>or structs that you've malloced memory for.
I see.
>It would be sensible to use __strong as a decorator for non-object
>pointer return values to indicate that they are GC-allocated memory,
>purely out of convention, but as far as I know such a convention is
>not established in the API as of 10.5.
NSAllocateCollectable() for example returns "void *__strong"; UTF8String
and fileSystemRepresentation (and others) do not. This discrepancy is
either a) an indication that the returned memory may not be GC-
controlled b) an error in the declarations. I don't know for sure.
The docs sure could use some love in this area.
--
____________________________________________________________
Sean McBride, B. Eng email@hidden
Rogue Research www.rogue-research.com
Mac Software Developer Montréal, Québec, Canada
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