On 3 Apr '08, at 5:07 PM, Robert Claeson wrote:
The default autorelease pool is created in the <project name>.m file of a newly created project. If you have messed around too much with that file, you might have deleted it.
There's not a "default" autorelease pool. They form a stack, and get pushed and popped dynamically.
It's true that the very outermost pool on the main thread is created in main(); but hopefully nothing your app is doing dynamically will end up using that pool, because objects autoreleased into it will hang around until the app quits.
But usually when your app code is running, it's responding to events or timers or other actions under the control of the runloop, so the topmost autorelease pool is a temporary one created by the runloop for the duration of that call (and cleaned up as soon as your code returns.)
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.
—Jens
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