499 struct task_arena_impl {  struct
510     task_arena_impl::initialize(ta);  in initialize()
513     task_arena_impl::terminate(ta);  in terminate()
516     return task_arena_impl::attach(ta);  in attach()
519     task_arena_impl::execute(ta, d);  in execute()
522     task_arena_impl::wait(ta);  in wait()
526     return task_arena_impl::max_concurrency(ta);  in max_concurrency()
530     task_arena_impl::enqueue(t, nullptr, ta);  in enqueue()
534     task_arena_impl::enqueue(t, &ctx, ta);  in enqueue()
537 void task_arena_impl::initialize(d1::task_arena_base& ta) {  in initialize()
569 void task_arena_impl::terminate(d1::task_arena_base& ta) {  in terminate()
577 bool task_arena_impl::attach(d1::task_arena_base& ta) {  in attach()
598 void task_arena_impl::enqueue(d1::task& t, d1::task_group_context* c, d1::task_arena_base* ta) {  in enqueue()
740 void task_arena_impl::execute(d1::task_arena_base& ta, d1::delegate_base& d) {  in execute()
806 void task_arena_impl::wait(d1::task_arena_base& ta) {  in wait()
819 int task_arena_impl::max_concurrency(const d1::task_arena_base *ta) {  in max_concurrency()