I'm struggling to re-learn C++ and I'm playing around with jthread at the moment. I seem to have got things working when calling a class member function that I want on its own thread. However, the function never actually seems to get called. I can't work out what I'm missing here. If someone can point out my inevitably "learner's" error, I'd be really grateful.
// includes and directives#include <iostream>#include <thread>#include <functional>#include <chrono>// a class for testing stuffclass A {private: int updates{ 0 }; // something to count on int tick{ 1000 }; // tick time set to 1000ms initiallypublic: void set_tick(int t) { tick = (t<1?1:t); // sanity check and set tick time } int get_updates() { return updates; // I did how many? } void update(std::stop_token st) { while (!st.stop_requested()) { // stop if they say stop updates++; // count this as an update std::cout << "Performing update" << updates << "\n"; // visually indicate something happened std::this_thread::sleep_for(std::chrono::milliseconds(tick)); // wait for tick time before doing it all again } } void start() { // start a ticking function std::cout << "Starting update thread\n"; // tell someone responsible that it's started std::jthread thr_A(std::bind_front(&A::update, this)); // start the parallel process fucntion in this class }};// main thingint main(){ std::cout << "Start main thread\n"; // say that I'm starting up A a; // make me a sandwich a.set_tick(10); // really fast(ish) a.start(); // go on, get on with it std::this_thread::sleep_for(std::chrono::milliseconds(10000)); // wait until sandwich ready std::cout << "Wake main thread and terminate\n"; // sandwich is ready, time to eat}
