// This program demonstrates how to use a runtime task to forcefully
// schedule an active task that would never be scheduled.

#include <taskflow/taskflow.hpp>

int main() {

 tf::Taskflow taskflow("Runtime Tasking");
 tf::Executor executor;

 tf::Task A, B, C, D;

 std::tie(A, B, C, D) = taskflow.emplace(
 [] () { return 0; },
 [&C] (tf::Runtime& rt) { // C must be captured by reference
 std::cout << "B\n";
 rt.schedule(C);
 },
 [] () { std::cout << "C\n"; },
 [] () { std::cout << "D\n"; }
 );

 // name tasks
 A.name("A");
 B.name("B");
 C.name("C");
 D.name("D");

 // create conditional dependencies
 A.precede(B, C, D);

 // dump the graph structure
 taskflow.dump(std::cout);

 // we will see both B and C in the output
 executor.run(taskflow).wait();

 return 0;
}