Binary search warning in CFArrayBSearchValues

问题

i'm using CFArrayBSearchValues.

Ref: http://developer.apple.com/library/mac/documentation/CoreFoundation/Reference/CFArrayRef/Reference/reference.html#//apple_ref/doc/uid/20001192-CH201-F10956

It works successfully but compiler show me a warning on first parameter:

CFIndex indexResult = CFArrayBSearchValues( 
                         m_Locations, 
                         CFRangeMake(0, [m_Locations count]), 
                         data, 
                         PGPlaceDataCompare, nil);

CFArrayBSearch expect as first parameter an CFArrayRef.
My m_Locations is an NSMutableArray.

How to resolve this warning? I need to do any cast to NSMutableArray to CFArrayRef?

thanks.

回答1:

Yes. Just cast the NSMutableArray to CFArrayRef.

CFIndex indexResult = CFArrayBSearchValues( 
                         (CFArrayRef)m_Locations, 
                         CFRangeMake(0, [m_Locations count]), 
                         data, 
                         PGPlaceDataCompare, NULL);

---

On iOS 4.0 or later you could use the Objective-C method -indexOfObject:inSortedRange:options:usingComparator: instead.

 NSUInteger indexResult = [m_Locations
                            indexOfObject:data
                            inSortedRange:NSMakeRange(0, [m_Locations count])
                                  options:0
                          usingComparator:^(id a, id b) { ... }];

来源：https://stackoverflow.com/questions/5456633/binary-search-warning-in-cfarraybsearchvalues