// create an executor and a taskflow

tf::Executor executor;

tf::Taskflow taskflow;

taskflow.name("Demo");

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

auto B = taskflow.emplace([&](auto& 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);

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

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

taskflow.dump(std::cout);

std::cout << std::endl;

executor.run(taskflow).get();

std::cout << std::endl;

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

taskflow.dump(std::cout);

std::cout << std::endl;

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

executor.run(taskflow);

executor.wait_for_all();

std::cout << std::endl;

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

executor.run_n(taskflow, 2).get();

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

taskflow.dump(std::cout);

std::cout << std::endl;

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

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

std::cout << std::endl;

std::cout << "Run the framework until a counter (init value=3) becomes zero\n";

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

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

return counter -- == 0;

}).get();

taskflow.dump(std::cout);

return 0;