117 struct feeder_item_task: public task {
149     task* execute(execution_data& ed) override {  in execute()
155     task* cancel(execution_data& ed) override {  in cancel()
173         auto task = alloc.new_object<feeder_task>(item, *this, alloc);  in internal_add_copy_impl()  local
176         spawn(*task, my_execution_context);  in internal_add_copy_impl()
190         auto task = alloc.new_object<feeder_task>(std::move(item), *this, alloc);  in internal_add_move()  local
193         spawn(*task, my_execution_context);  in internal_add_move()
210 struct for_each_iteration_task: public task {
221     task* execute(execution_data&) override {  in execute()
227     task* cancel(execution_data&) override {  in cancel()
259 struct input_block_handling_task : public task {
282     task* execute(execution_data& ed) override {
297     task* cancel(execution_data& ed) override {
323 struct forward_block_handling_task : public task {
347     task* execute(execution_data& ed) override {
362     task* cancel(execution_data& ed) override {
476 class for_each_root_task_base : public task {
485     task* cancel(execution_data&) override {
508     task* execute(execution_data& ed) override {
546     task* execute(execution_data& ed) override {
582     task* execute(execution_data&) override {