// A simple example to capture the following task dependencies.
//
//           +---+
//     +---->| B |-----+
//     |     +---+     |
//   +---+           +-v-+
//   | A |           | D |
//   +---+           +-^-+
//     |     +---+     |
//     +---->| C |-----+
//           +---+
//
#include   // the only include you need

int main(){

  tf::Executor executor;
  tf::Taskflow taskflow("simple");

  auto [A, B, C, D] = taskflow.emplace(
    []() { std::cout