pre_scan_tag and final_scan_tag#
[algorithms.parallel_scan.scan_tags]
Types that distinguish the phases of parallel_scan.
Types pre_scan_tag and final_scan_tag are dummy types used in conjunction with parallel_scan.
See the example in the parallel_scan section for demonstration of how they are used in the signature of operator().
// Defined in header <oneapi/tbb/parallel_scan.h>
namespace oneapi {
namespace tbb {
struct pre_scan_tag {
static bool is_final_scan();
operator bool();
};
struct final_scan_tag {
static bool is_final_scan();
operator bool();
};
} // namespace tbb
} // namespace oneapi