#include <thread>
#include <stdio.h>
#include <unistd.h>

void dummy(int x, int &ret) {
    printf("dummy started\n");
    ret = 0;
    for (int i = 0; i < x; i++) {
        ret += i*i*i;
    }
    printf("dummy ended\n");
}

int main() {
    printf("hello!\n");
    int dummyret;
    std::thread x(dummy,1000000000, std::ref(dummyret));
    ::usleep(10000);
    printf("I'm here\n");
    x.join();
    printf("All ended: dummyret=%d\n", dummyret);
    // printf("future ended: %d\n", x.get());
}