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

#include 

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