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Re: Purpose of [NSAutoreleasePool drain] ?
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Re: Purpose of [NSAutoreleasePool drain] ?


  • Subject: Re: Purpose of [NSAutoreleasePool drain] ?
  • From: Chris Kane <email@hidden>
  • Date: Thu, 16 Jun 2005 09:08:24 -0700

On Jun 16, 2005, at 7:59 AM, Nick Zitzmann wrote:
On Jun 16, 2005, at 6:38 AM, Jim Correia wrote:

If the docs are correct, the pool should not be reused after a drain. If they are wrong, a bug needs to be filed.

I just ran a quick test and the docs are correct; -[NSAutoreleasePool drain] and -[NSAutoreleasePool release] appear to do exactly the same thing. So the better question is why was this method added?


Nick Zitzmann
<http://www.chronosnet.com/>

The method was added as an alternate name for possible future Garbage Collection purposes, as retain/release methods would become no-ops across the board. The next question would then be: why would autorelease pools be interesting in a GC environment? The answer is: the pool usage in existing source code (at the hypothetical future time of GC availability) might be useful as possible hints to the collector that "now would be a good time to do a little collecting".


But GC isn't here yet (as of Tiger), and who knows if it will ever happen. We don't expect people to be using -drain today, and I would advise against it (in case it takes on some new behaviors in the future).


Chris Kane Cocoa Framework, Apple

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References: 
 >Purpose of [NSAutoreleasePool drain] ? (From: Matt Gough <email@hidden>)
 >Re: Purpose of [NSAutoreleasePool drain] ? (From: Nicko van Someren <email@hidden>)
 >Re: Purpose of [NSAutoreleasePool drain] ? (From: Jim Correia <email@hidden>)
 >Re: Purpose of [NSAutoreleasePool drain] ? (From: Nick Zitzmann <email@hidden>)

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