Using setInterval() in C++

Question

In JavaScript, there is a function called setInterval(). Can it be achieved in C++? If a loop is used, the program does not continue but keeps calling the function.

Answer 1

There is no built in setInterval in C++. you can imitate this function with asynchronous function:

template 
void setInterval(std::atomic_bool& cancelToken,size_t interval,F&& f, Args&&... args){
  cancelToken.store(true);
  auto cb = std::bind(std::forward(f),std::forward(args)...);
  std::async(std::launch::async,[=,&cancelToken]()mutable{
     while (cancelToken.load()){
        cb();
        std::this_thread::sleep_for(std::chrono::milliseconds(interval));
     }
  });
}

use cancelToken to cancel the interval with

cancelToken.store(false);

do notice though, that this mchanism construct a new thread for the task. it is not usable for many interval functions. in this case, I'd use already written thread-pool with some sort of time-measurment mechanism.

Edit : example use:

int main(int argc, const char * argv[]) {
    std::atomic_bool b;
    setInterval(b, 1000, printf, "hi there\n");
    getchar();
}