// This program demonstrates how to change the worker behavior
// upon the creation of an executor.

#include <taskflow/taskflow.hpp>

class CustomWorkerBehavior : public tf::WorkerInterface {

 public:
 
 // to call before the worker enters the scheduling loop
 void scheduler_prologue(tf::Worker& w) override {
 std::cout << tf::stringify(
 "worker ", w.id(), " (native=", w.thread()->native_handle(), ") enters scheduler\n"
 ); 
 }

 // to call after the worker leaves the scheduling loop
 void scheduler_epilogue(tf::Worker& w, std::exception_ptr) override {
 std::cout << tf::stringify(
 "worker ", w.id(), " (native=", w.thread()->native_handle(), ") leaves scheduler\n"
 ); 
 }
};

int main() {

 tf::Executor executor(4, std::make_shared<CustomWorkerBehavior>());
 
 return 0;
}