basic thread example from modern cpp concurrency in depth

s1e8-exercise.hpp

#include <iostream>
#include <thread>

enum COMMAND{CLEAN, FULL_SPEED_AHEAD, EXIT};

int main() {
  
  int cmd;
  bool done=false;

  while(!done){
    std::cout<<"Enter command:";
    std::cin>>cmd;

    if(cmd==COMMAND::CLEAN){
        std::thread th([](){
          std::cout<<"Cleaning..."<<std::endl;
        });
        th.detach();
    }else if( cmd ==COMMAND::FULL_SPEED_AHEAD){
        std::thread th([](){
          std::cout<<"Full speed ahead..."<<std::endl;
        });
        th.join();
        std::cout<<"Full speed done"<<std::endl;
    }else if(cmd==COMMAND::EXIT){
        done=true;
    }else{
        std::cerr<<"Invalid command."<<std::endl;
    }
  }

  return 0;
}