Despite reading the ARC documentation about 5 times, scanning the devforums and
reading Mike Ash's post about ARC I'm totally failing to find the correct
bridge cast for the following piece of code when converting to ARC.
-(void)addView:(UIView *)view forElement:(id)element
{
CFDictionarySetValue( viewToElementMap, view, element );
}
in this case viewToElementMap is a CFMutableDictionary with retain/retain
syntax. The reason for not using an NSMutableDictionary of course is because
UIViews aren't copyable. I use this kind of map all over the place in my code
(and wish constantly that iOS had a retain/retain map)
the ARC pre-check rightly complains about both view and element in that
statement. Now, as the CFDictionary is going to CFRetain on add and CFRelease
on removal, I thought I just wanted to __bridge cast both of them. That works
for element, but not for view, ie if I try this
-(void)addView:(UIView *)view forElement:(id)element
{
CFDictionarySetValue( viewToElementMap, (__bridge id)view, (__bridge
id)element );
}
gives me
error: incompatible types casting 'UIView *__strong' to 'id' with a __bridge
cast [4]
but is fine about the element cast.
and no combination of casts I've yet tried has managed to fix that. I don't
think I want either __bridge_transfer or __bridge_retained, the former is for
passing things back to obj-c classes and the latter I believe effectively
transfers ownership and would require an extra CFRelease() which isn't going to
happen, I don't want to transfer ownership, the dictionary will take its own
ownership.
Can someone please explain what I need here and why? Also, why is 'view' being
treated differently from 'element'? Even if I change 'view' to type 'id' I
still get a similar error message when using (__bridge id) on 'view', but not
on 'element'. I looked at the signature of CFDictionarySetValue() to see if
there were any qualifiers on the parameters, but they are both const void*.
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