Hi,
This is all explained for you here:
http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/Concepts/AutoreleasePools.html
and here: http://developer.apple.com/documentation/Cocoa/Conceptual/CarbonCocoaDoc/Articles/WrapperFunctions.html#/
/apple_ref/doc/uid/20002398-TP1
To summarize:
If you are writing a tool that links with Foundation and not AppKit,
an autorelease pool is NOT created for you. As you saw in your first
example, you need to explicitly create and destroy one whenever you
are dealing with Foundation objects in a method.
If you are writing an application that links with AppKit (and
Foundation), autorelease pools are managed for you, and one should
always exist when calling any obj-c method. Usually, they are created
before dealing with an event, and destroyed after everything returns
to main. (This all assumes you keep the main function generated by the
xcode template intact)
If you are writing an application in Carbon that uses AppKit, it
depends. I assume you are doing this in your second example, and
calling NSApplicationLoad somewhere. Usually, it is better just to
always explicitly create an autorelease pool, but it is created for
you in some contexts, as you are seeing.
I don't think there is any public API for checking if an autorelease
pool is in place before, but if you are working with a complex carbon
situation, it never hurts to just create your own to be sure.
Also, a small note:
Aaron Hillehass in his book, said that if object wasn't created with
alloc, new, copy or mutableCopy then that object will be added
to the default autorelease pool
Reread that sentence in Hillegass's book.It says to "assume...[the
object] is in the autorelease pool". It will not always be the case
that an object not created with alloc, copy, etc. will be in an
autorelease pool. It might be a singleton or cached in some way. These
are usually implementation details, but just watch out.
Adam Leonard
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