#include <vector>
#include <algorithm>
#include <iostream>

using namespace std;

int main() {
    vector<int> ints = {1, 2, 3, 4, 5, 6};
    int total = 0;
    for_each(begin(ints), end(ints), [&total](int x) {
            total += x;
    });
    cout << "total: " << total << endl;
    auto my_lambda_doubling_func = [&](int x) -> int { return x * 2; };
    cout << my_lambda_doubling_func(total) << endl;
    return 0;
}