future2.cpp

#include <future>
#include <iostream>
using namespace std;


int factorial(int N){
    if(N == 1){
        return 1;
    }

    return N * factorial(N-1);
}

int main(){
    std::future<int> fu = std::async(factorial, 4);
    std::future<int> fu2 = std::async(factorial, 6);
    int x = fu.get();

    int x2 = fu2.get();

    cout << "x: " << x << endl;
    cout <<"x2: " << x2 << endl;
    
}