// A simple example to capture the following task dependencies.
//
// TaskA---->TaskB---->TaskD
// TaskA---->TaskC---->TaskD

#include   // the only include you need

int main(){

  tf::Executor executor;
  tf::Taskflow taskflow;
  
  auto [A, B, C, D] = taskflow.emplace( 
    [] () { std::cout