Searches an array for a value using a binary search algorithm.


func CFArrayBSearchValues(_ theArray: CFArray!, _ range: CFRange, _ value: UnsafeRawPointer!, _ comparator: CFComparatorFunction!, _ context: UnsafeMutableRawPointer!) -> CFIndex



An array, sorted from least to greatest according to the comparator function.


The range within theArray to search. The range must not exceed the bounds of theArray. The range may be empty (length 0).


The value for which to find a match in theArray. If value, or any other value in theArray, is not understood by the comparator callback, the behavior is undefined.


The function with the comparator function type signature that is used in the binary search operation to compare values in theArray with the given value. If there are values in the range that the comparator function does not expect or cannot properly compare, the behavior is undefined.


A pointer-sized program-defined value, which is passed as the third argument to the comparator function, but is otherwise unused by this function. If the context is not what is expected by the comparator function, the behavior is undefined.

Return Value

The return value is one of the following:

  • The index of a value that matched, if the target value matches one or more in the range.

  • Greater than or equal to the end point of the range, if the value is greater than all the values in the range.

  • The index of the value greater than the target value, if the value lies between two of (or less than all of) the values in the range.

See Also