// g++ -std=c++11 -o deque_shared_ptr_test deque_shared_ptr_test.cpp

#include <iostream>
#include <deque>

using namespace std;

class Integer {
private:
    int val_;
public:
    Integer(int val) : val_(val) {}

    int getVal() const { return val_; };
};

int main() {
    deque<shared_ptr<Integer>> dq;

    dq.push_back(make_shared<Integer>(1));
    dq.push_back(make_shared<Integer>(2));
    dq.push_back(make_shared<Integer>(3));
    dq.push_back(make_shared<Integer>(4));

    cout << "[Before erase] dq.size() = " << dq.size() << endl;

    Integer* p = dq[3].get();

    dq.erase(dq.begin());
    dq.erase(dq.begin());

    cout << "[After erase] dq.size() = " << dq.size() << endl;

    cout << "Val = " << p->getVal() << endl;

    return 0;
}