tf::Executor executor;

tf::Taskflow taskflow;

int i;

// create three condition tasks for nested control flow

auto initi = taskflow.emplace([&](){ i=3; });

auto cond1 = taskflow.emplace([&](){ return i>1 ? 1 : 0; });

auto cond2 = taskflow.emplace([&](){ return i>2 ? 1 : 0; });

auto cond3 = taskflow.emplace([&](){ return i>3 ? 1 : 0; });

auto equl1 = taskflow.emplace([&](){ std::cout << "i=1\n"; });

auto equl2 = taskflow.emplace([&](){ std::cout << "i=2\n"; });

auto equl3 = taskflow.emplace([&](){ std::cout << "i=3\n"; });

auto grtr3 = taskflow.emplace([&](){ std::cout << "i>3\n"; });

initi.precede(cond1);

cond1.precede(equl1, cond2);

cond2.precede(equl2, cond3);

cond3.precede(equl3, grtr3);

// dump the conditioned flow

taskflow.dump(std::cout);

executor.run(taskflow).wait();

return 0;