shared ptr ex

#include <bits/stdc++.h>
#include <memory>
#include <future>
using namespace std;
using Pii = pair<int, int>;

void printPair(const Pii &pii) {
    cerr << pii.first << ' ' << pii.second << endl;
}

int main() {
    auto sp = make_shared<Pii>(1, 2);
    shared_ptr<Pii> sp2 = sp;
    printPair(*sp2);
    cerr << sp.use_count() << endl;
    cerr << sp.get() << endl;

    return 0;
}