On 04/04/2008, at 11:47 AM, Jens Alfke wrote:
It's true that the very outermost pool on the main thread is created in main();
I don't think that's normally the case. For a Cocoa application created by the Xcode template, it won't create an autorelease pool for you. Obviously, there won't be one created for you in the template for a Carbon application.
I suspect the reason for the observed difference reported in the original e-mail was because the code either wasn't running in the Carbon application, or was running as part of the event loop—I believe that an autorelease pool will be created for Carbon event loops.
To answer the original question: I don't think you can tell whether there's an autorelease pool active. But it doesn't matter: if you're doing anything that could autorelease objects, and there might not be a pool already, create your own by calling [NSAutoreleasePool new] beforehand and [pool drain] afterwards.
I think you mean [pool release], not [pool drain]. - Chris
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