boost::compute::set_difference — Set difference algorithm.
// In header: <boost/compute/algorithm/set_difference.hpp> template<typename InputIterator1, typename InputIterator2, typename OutputIterator> OutputIterator set_difference(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, OutputIterator result, command_queue & queue = system::default_queue());
Finds the difference of the sorted range [first2, last2) from the sorted range [first1, last1) and stores it in range starting at result
Parameters: 


Returns: 
Iterator pointing to end of difference 