range_based_for_loop

#include <iostream>
#include <vector>
#include <boost/type_index.hpp>
using namespace std;
using boost::typeindex::type_id_with_cvr;

int main()
{
    vector<int> vec{100};

    for (auto ele : vec)
        cout << type_id_with_cvr<decltype(ele)>() << endl; // int
    for (const auto &ele : vec)
        cout << type_id_with_cvr<decltype(ele)>() << endl; // int const&
    for (auto &&ele : vec) {
        cout << type_id_with_cvr<decltype(ele)>() << endl; // int &
        ++ele;
        cout << vec.front() << endl; // 101
    }
    return 0;
}