// create an executor and a taskflow

tf::Executor executor(1);

tf::Taskflow taskflow("Demo");

auto A = taskflow.emplace([&](){ std::cout << "TaskA\n"; }).name("A");

auto B = taskflow.emplace([&](tf::Subflow& subflow){

std::cout << "TaskB\n";

auto B1 = subflow.emplace([&](){ std::cout << "TaskB1\n"; }).name("B1");

auto B2 = subflow.emplace([&](){ std::cout << "TaskB2\n"; }).name("B2");

auto B3 = subflow.emplace([&](){ std::cout << "TaskB3\n"; }).name("B3");

B1.precede(B3);

B2.precede(B3);

}).name("B");

auto C = taskflow.emplace([&](){ std::cout << "TaskC\n"; }).name("C");

auto D = taskflow.emplace([&](){ std::cout << "TaskD\n"; }).name("D");

A.precede(B, C);

B.precede(D);

C.precede(D);

// dumpping a taskflow before execution won't visualize subflow tasks

std::cout << "Dump the taskflow before execution:\n";

taskflow.dump(std::cout);

std::cout << "Run the taskflow once without callback\n" << std::endl;

executor.run(taskflow).get();

std::cout << std::endl;

// after execution, we can visualize subflow tasks

std::cout << "Dump the taskflow after execution:\n";

taskflow.dump(std::cout);

std::cout << std::endl;

std::cout << "Use wait_for_all to wait for the execution to finish\n";

executor.run(taskflow).get();

executor.wait_for_all();

std::cout << std::endl;

std::cout << "Execute the taskflow two times without a callback\n";

executor.run(taskflow).get();

std::cout << "Dump after two executions:\n";

taskflow.dump(std::cout);

std::cout << std::endl;

std::cout << "Execute the taskflow four times with a callback\n";

executor.run_n(taskflow, 4, [] () { std::cout << "finishes 4 runs\n"; })

.get();

std::cout << std::endl;

std::cout << "Run the taskflow until the predicate returns true\n";

executor.run_until(taskflow, [counter=3]() mutable {

std::cout << "Counter = " << counter << std::endl;

return counter -- == 0;

}).get();

taskflow.dump(std::cout);

return 0;