#include <iostream>
#include <thread>
#include "unistd.h"
using namespace std;
int add(int a, int b) {
sleep(1);
return a + b;
}
thread t([] {
int result = add(3, 5);
cout << "result: " << result << endl;
});
cout << "main thread\n";
t.join();
//output:
//main thread
//result: 8