tf::Executor executor;

tf::Taskflow taskflow;

int i;

auto [init, body, cond, done] = taskflow.emplace(

[&](){ std::cout << "i=0\n"; i=0; },

[&](){ std::cout << "i++ => i="; i++; },

[&](){ std::cout << i << '\n'; return i<5 ? 0 : 1; },

[&](){ std::cout << "done\n"; }

);

init.name("init");

body.name("do i++");

cond.name("while i<5");

done.name("done");

init.precede(body);

body.precede(cond);

cond.precede(body, done);

//taskflow.dump(std::cout);

executor.run(taskflow).wait();

return 0;