.rst .pdf

open issue suggest edit

Contents

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 <tbb/parallel_scan.h>

namespace tbb {

   struct pre_scan_tag {
       static bool is_final_scan();
       operator bool();
   };

   struct final_scan_tag {
       static bool is_final_scan();
       operator bool();
   };

}

Member functions

bool is_final_scan()

true for a final_scan_tag, false, otherwise.

operator bool()

true for a final_scan_tag, false, otherwise.

parallel_scan parallel_for_each