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Updated README to give some more information about ARC.

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theraven 2011-07-06 11:06:39 +00:00
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@ -447,3 +447,18 @@ The runtime implements the following optimisations:
- If an object is autoreleased, returned, and retained, it is just stored in
thread-local storage temporarily, not actually autoreleased.
- Moving weak references skips the retain / release step.
ARC requires the ability to interoperate perfectly with manual retain / release
code, including the ability for non-ARC code to implement custom reference
counting behaviour. If an object implements -_ARCCompliantRetainRelease, then
it is advertising that its retain, release, and autorelease implementations are
ARC-compatible. These methods may be called explicitly in non-ARC code, but
will not be called from ARC.
ARC moves autorelease pools into the runtime. If NSAutoreleasePool exists and
does not implement a -_ARCCompatibleAutoreleasePool method, then it will be
used directly. If it does not exist, ARC will implement its own autorelease
pools. If it exists and does implement -_ARCCompatibleAutoreleasePool then it
must call objc_autoreleasePoolPush() and objc_autoreleasePoolPop() to manage
autoreleased object storage and call objc_autorelease() in its -addObject:
method.