Method upper_bound

include/boost/compute/container/flat_map.hpp:337–347

    }

    iterator upper_bound(const key_type &value, command_queue &queue)
    {
        ::boost::compute::get<0> get_key;

        return ::boost::compute::upper_bound(
                   ::boost::compute::make_transform_iterator(begin(), get_key),
                   ::boost::compute::make_transform_iterator(end(), get_key),
                   value,
                   queue
               ).base();
    }

    iterator upper_bound(const key_type &value)
    {