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#include <iostream>
#include <thread>
#include <chrono>
using namespace std;
using namespace chrono;
void add(int const &p1, int const &p2)
{
this_thread::sleep_for(milliseconds(200));
cerr << p1 << " + " << p2 << " = " << (p1 + p2) << '\n';
}
void run()
{
int v1 = 10;
int v2 = 20;
// thread(add, ref(v1), ref(v2)).detach(); // DON'T DO THIS
thread(add, int(v1), int(v2)).detach(); // this is OK: own copies
}
int main()
{
run();
this_thread::sleep_for(seconds(1));
}
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