functor-state.cpp

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

class Sum
{
public:
        Sum() : m_total(0) {}
        void operator()(int value) { m_total += value; }

        friend std::ostream& operator<<(std::ostream& os, Sum& s)
        {
                os << s.m_total;
                return os;
        }

private:
        int m_total;
};

int main()
{
        std::vector<int> vect({1, 2, 3, 4, 5, 6});
        Sum sum = for_each(vect.begin(), vect.end(), Sum());
        std::cout << sum << std::endl;
        return 0;
}