lst-0055-godb.cpp
//#(compile) c++; compiler:g132; options:-O3 -std=c++23; libs:-
// https://godbolt.org/z/bq1hn5rjo
#include <future>
#include <thread>
#include <iostream>
int ack(int m, int n); // Ackermann function
int main () {
std::packaged_task<int(int,int)> task2 { &ack }; // different signature
auto f2 = task2.get_future();
std::jthread th2 { move(task2), 3, 12 }; // Parameters here
std::cout << " ack(3,12):" << f2.get() << '\n'; // Output: ack(3,12):32765
th2.join();
}