test

foo.cpp

#include <numeric>
#include <functional>
#include <vector>
#include <iostream>

typedef std::vector<int> int_vector;

int main(void)
{
    int_vector v;
    v.push_back(0);
    v.push_back(5);
    v.push_back(10);
    v.push_back(15);
    v.push_back(20);

    std::cout << std::accumulate(v.begin(), v.end(), 0) << std::endl;
    return 0;
}