tf::Executor executor;

tf::Taskflow taskflow;

auto [A, B, C, D] = taskflow.emplace(

[] () { std::cout << "TaskA\n"; }, //

[] () { std::cout << "TaskB\n"; }, // +---+

[] () { std::cout << "TaskC\n"; }, // +---->| B |-----+

[] () { std::cout << "TaskD\n"; } // | +---+ |

); // +---+ +-v-+

// | A | | D |

A.precede(B); // B runs after A // +---+ +-^-+

A.precede(C); // C runs after A // | +---+ |

B.precede(D); // D runs after B // +---->| C |-----+

C.precede(D); // D runs after C // +---+

executor.run(taskflow).get();

return 0;