THIS HAS BUGS: JS's setTimeout in C++ on libuv

set-timeout-libuv.cc

template <typename Fn>
void set_timeout(Fn fn, uint64_t timeout, uv_loop_t* l = nullptr) {
    struct payload {
        uv_timer_t timer;
        Fn fn;
        payload(Fn&& f) : fn(f) {}
    };
    
    payload* p = new payload(std::move(fn));
    if (!l) {
        l = uv_default_loop();
    }
    uv_timer_init(l, &p->timer);
    p->timer.data = p;
    uv_timer_start(&p->timer,
                   [](uv_timer_t* handle) {
                       payload* p = (payload*)handle->data;
                       p->fn();
                       uv_close((uv_handle_t*)handle, [](uv_handle_t* h){
                           payload* p = (payload*)h->data;
                           delete p; // it seems that we can not delete here, inside of uv_close handler
                       });
                   },
                   timeout,
                   0);
}


set_timeout([]() {
    printf("hello after 10 ms");
}, 10);