include "NSLog.incl"

local fn SymmetricDifferenceOfSets( setA as CFSetRef, setB as CFSetRef ) as CFSetRef
  CFMutableSetRef notInSetA = fn MutableSetWithSet( setB )
  MutableSetMinusSet( notInSetA, setA )
  CFMutableSetRef notInSetB = fn MutableSetWithSet( setA )
  MutableSetMinusSet( notInSetB, setB )
  CFMutableSetRef symmetricDifference = fn MutableSetWithSet( notInSetA )
  MutableSetUnionSet( symmetricDifference, notInSetB )
end fn = fn SetWithSet( symmetricDifference )

CFSetRef set1, set2

set1 = fn SetWithObjects( @"John", @"Serena", @"Bob",  @"Mary", @"Serena", NULL )
set2 = fn SetWithObjects( @"Jim",  @"Mary",   @"John", @"Jim",  @"Bob",    NULL )

NSLog( @"Symmetric difference:\n%@", fn SymmetricDifferenceOfSets( set1, set2 ) )

HandleEvents