#include <chrono>#include <condition_variable>#include <iostream>#include <mutex>#include <string_view>#include <thread> usingnamespace std::chrono_literals; int main(){std::cout<<std::boolalpha;auto print=[](std::string_view name,conststd::stop_source& source){std::cout<< name<<": stop_possible = "<< source.stop_possible();std::cout<<", stop_requested = "<< source.stop_requested()<<'\n';}; // A worker threadauto worker=std::jthread([](std::stop_token stoken){for(int i=10; i;--i){std::this_thread::sleep_for(300ms);if(stoken.stop_requested()){std::cout<<"  Sleepy worker is requested to stop\n";return;}std::cout<<"  Sleepy worker goes back to sleep\n";}}); std::stop_source stop_source= worker.get_stop_source();    print("stop_source", stop_source); std::cout<<"\nPass source to other thread:\n";auto stopper=std::thread([](std::stop_source source){std::this_thread::sleep_for(500ms);std::cout<<"Request stop for worker via source\n";            source.request_stop();},        stop_source);    stopper.join();std::this_thread::sleep_for(200ms);std::cout<<'\n';     print("stop_source", stop_source);}

stop_source: stop_possible = true, stop_requested = false Pass source to other thread:  Sleepy worker goes back to sleepRequest stop for worker via source  Sleepy worker is requested to stop stop_source: stop_possible = true, stop_requested = true