NSString *explanation;
[ self doSomeThingAndExplain:( urgent ? NULL : &explanation ) ];

I tried some REALLY ugly casts putting __autoreleasing and __strong here and 
there around the *s in the explainP but got nowhere, so that's the best I can 
come up with apart from writing doSomethingAndDontExplain which calls the other 
one with NULL. 


On 5 Dec, 2012, at 12:56 PM, "Gerriet M. Denkmann" <[email protected]> wrote:

> I have (using Arc) a method which works fine:
> NSString *explanation;
> [ self doSomeThingAndExplain: &explanation ];
> 
> Now I decided that sometimes I don't need this explanation. So I changed it 
> to:
> 
> NSString **explanatioP = urgent ? NULL : &explanation; // <-- "no explicit 
> ownership...
> [ self doSomeThingAndExplain: explanatioP];   //      passing address of 
> non-local object...
> 
> But now the compiler gets really upset (errors written as comments above).
> 
> What Arc-magic is needed to get this to compile?
> 
> Gerriet.
> 
> 
> 
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