Add TODO

Signed-off-by: pavelkumbrasev <[email protected]>

src/tbb/task.cpp

@@ -233,6 +233,7 @@ d1::wait_tree_vertex_interface* get_thread_reference_vertex(d1::wait_tree_vertex
     } else {
         constexpr std::size_t max_reference_vertex_map_size = 1000;
         if (reference_map.size() > max_reference_vertex_map_size) {
+            // TODO: Research the possibility of using better approach for a clean-up
             for (auto it = reference_map.begin(); it != reference_map.end();) {
                 if (it->second->get_num_child() == 0) {
                     it->second->~reference_vertex();