#include <iostream>
#include <algorithm>
#include <iterator>

struct S
{
    int sum = 0;
    void operator()(int i) { sum += i; }
};

int main(void) {
    int a[] = { 1, 2, 3, 4, 5 };
    std::cout << std::for_each(std::begin(a), std::end(a), S()).sum << std::endl;
}