Off of the top of my head, have a look at:

http://clang.llvm.org/docs/AutomaticReferenceCounting.html#precise-lifetime-semantics
 
<http://clang.llvm.org/docs/AutomaticReferenceCounting.html#precise-lifetime-semantics>

and

http://clang.llvm.org/docs/AutomaticReferenceCounting.html#interior-pointers 
<http://clang.llvm.org/docs/AutomaticReferenceCounting.html#interior-pointers>


> On May 8, 2016, at 7:11 PM, Gerriet M. Denkmann <[email protected]> wrote:
> 
> Thing *aThing = [ Thing new ];
> 
> void *thingData = [ aThing data ];    //      pointer to a buffer owned by 
> aThing
> 
> … never use aThing after this point → Arc might release aThing right now
> … but do lots of things with thingData
> 
> … no more need for thingData
> [ aThing release];
> 
> How to prevent Arc to release aThing before I have done with thingData?
> 
> Gerriet.
> 
> 
> 
> 
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